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A modified back analysis method for deep excavation with multi-objective optimization procedure

Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1373-1387页

作者： Chenyang Zhao Le Chen Pengpeng Ni Wenjun Xia Bin Wang State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China guangdong research center for underground space exploitation technology School of Civil EngineeringSun Yat-sen UniversityGuangzhou510275China Southern Marine Science and Engineering guangdong Laboratory (Zhuhai) Zhuhai519000China Jiangsu Provincial Transportation Engineering Construction Bureau Nanjing210004China

Real-time prediction of excavation-induced displacement of retaining pile during the deep excavation process is crucial for construction *** paper proposes a modified back analysis method with multi-objective optimization procedure,which enables a real-time prediction of horizontal displacement of retaining pile during *** opposed to the traditional stage-by-stage back analysis,time series monitoring data till the current excavation stage are utilized to form a multi-objective ***,the multi-objective particle swarm optimization (MOPSO) algorithm is applied for parameter *** optimized model parameters are immediately adopted to predict the excavation-induced pile deformation in the continuous construction *** achieve efficient parameter optimization and real-time prediction of system behavior,the back propagation neural network (BPNN) is established to substitute the finite element model,which is further implemented together with MOPSO for automatic *** proposed approach is applied in the Taihu tunnel excavation project,where the effectiveness of the method is demonstrated via the comparisons with the site monitoring *** method is reliable with a prediction accuracy of more than 90%.Moreover,different optimization algorithms,including non-dominated sorting genetic algorithm (NSGA-II),Pareto Envelope-based Selection Algorithm II (PESA-II) and MOPSO,are compared,and their influences on the prediction accuracy at different excavation stages are *** results show that MOPSO has the best performance for high dimensional optimization task.

关键词： Multi-objective optimization Back analysis Surrogate model Multi-objective particle swarm optimization(MOPSO) Deep excavation

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Preliminary research and scheme design of deep underground in situ geo-information detection experiment for Geology in Time

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International Journal of Mining Science and technology 2024年第1期34卷 1-13页

作者： Heping Xie Ru Zhang Zetian Zhang Yinshuang Ai Jianhui Deng Yun Chen Yong Zhou Mingchuan Li Liqiang Liu Mingzhong Gao Zeqian Yang Weiqiang Ling Heng Gao Qijun Hao Kun Xiao Chendi Lou State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep underground Engineering Sichuan UniversityChengdu 610065China College of Water Resource&Hydropower Sichuan UniversityChengdu 610065China guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyShenzhen UniversityShenzhen 518060China Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China Yalong River Hydropower Development Company Limited Chengdu 610051China

The deep earth,deep sea,and deep space are the main parts of the national“three deep”strategy,which is in the forefront of the strategic deployment clearly defined in China’s 14th Five-Year Plan(2021-2025)and the Long-Range Objectives Through the Year *** is important to reveal the evolutionary process and mechanism of deep tectonics to understand the earth’s past,present and *** academic con-notation of Geology in Time has been given for the first time,which refers to the multi-field evolution response process of geological bodies at different time and spatial scales caused by geological processes inside and outside the *** on the deep in situ detection space and the unique geological envi-ronment of China Jinping underground Laboratory,the scientific issue of the correlation mechanism and law between deep internal time-varying and shallow geological response is given *** research and frontier exploration on deep underground in situ geo-information detection experiments for Geology in Time are designed to be carried out,which will have the potential to explore the driving force of Geology in Time,reveal essential laws of deep earth science,and explore innovative technologies in deep underground engineering.

关键词： Deep underground Geology in Time China Jinping underground Laboratory In situ detection

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Self-Weight Penetration Characteristics of the Suction Foundation with Different Diameters in Sand

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China Ocean Engineering 2022年第5期36卷 743-754页

作者： SUN Kai MA Hui-huan GUO Cheng-chao LI Tao CAO Ding-feng XIE Peng WANG Fu-ming School of Civil Engineering Sun Yat-sen University&Southern Marine Science and Engineering Guangdong Lab-oratory(Zhuhai)Zhuhai 519082China guangdong Key Laboratory of Oceanic Civil Engineering Guangzhou 510275China guangdong research center for underground space exploitation technology Guangzhou 510275China Advanced Energy Science and technology guangdong Laboratory(Yangjiang offshore Wind Energy Laboratory) Yangjiang 529500China School of Marine Engineering and technology Sun Yat-sen UniversityZhuhai 519082China

During the self-weight penetration process of the suction foundation on the dense sand seabed,due to the shallow penetration depth,the excess seepage seawater from the outside to the inside of the foundation may cause the negative pressure penetration process *** the self-weight penetration depth has become an important problem for the safe construction of the suction *** new suction anchor foundation has been proposed,and the self-weight penetration characteristics of the traditional suction foundation and the new suction anchor foundation are studied and compared through laboratory experiments and *** the above two foundation types,by considering five foundation diameters and two bottom shapes,20 models are tested with the same penetration *** effects of different foundation diameters on the penetration depth,the soil plug characteristics,and the surrounding sand layer are *** results show that the penetration depth of the new suction foundation is smaller than that of the traditional suction *** the same penetration energy,the penetration depth of the suction foundation becomes shallower as the diameter *** smaller the diameter of the suction foundation,the more likely it is to be fully plugged,and the smaller the height of the soil plug will *** the stage of self-weight penetration,the impact cavity appears around the foundation,which may affect the stability of the suction foundation.

关键词： suction foundation foundation diameter self-weight penetration soil plugging sand

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Model test and numerical simulation of a new prefabricated double-row piles retaining system in silty clay ground

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underground space 2023年第6期13卷 262-280页

作者： Ruisong Wang Hao Yang Pengpeng Ni Chenyang Zhao Chengchao Guo Huihuan Ma Pu Dong Huqing Liang Mengxiong Tang School of Civil Engineering Sun Yat-sen UniversitySouthern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Guangdong Key Laboratory of Oceanic Civil EngineeringGuangdong Research Center for Underground Space Exploitation TechnologyZhuhai 519082China Beijing Urban Rail Transit Construction Engineering Co. LtdBeijing 100088China BeSTDR Infrastucture Hospital Zhumadian 463400China School of Architecture and Civil Engineering Huizhou UniversityHuizhou 516008China Guangzhou Municipal Construction Group Co. LtdGuangzhou 510275China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China

This paper introduces a new prefabricated recyclable double-row piles retaining system for excavations in silty clay *** model test and numerical simulation are conducted to study the system behavior upon *** horizontal displacement(δ_(h)),Von Mises stress(δ_(M)),strain(ε),ground surface settlement(δ_(v)),and earth pressure are systematically ***,the monitoring data of 13 excavation cases supported by double-row piles retaining system are presented and *** experimental results can basically match the numerical results,and the maximumδ_(M),maximum bending moment(M_(max)),maximum horizontal displacement(δ_(hm))of structural members are all less than the tolerance *** ground surface settlement model of double-row piles retaining system consists of three zones,i.e.,rebound influence zone,primary influence zone and secondary influence *** dhm values are 0.07%–1.42%of the excavation depth(He).The maximum ground surface settlement(δ_(vm))is generally less than *** ratio ofδ_(vm)=δ_(hm)varies between 0.09 and 0.76,with an average value of *** observed earth pressure on the retained side of front pile(paf)is about 0.53–0.57γH below the excavation *** the excavation surface,p_(af)decreases dramatically when getting closer to the ground surface.

关键词： Prefabricated recyclable structure Double-row piles retaining system Physical model test Numerical simulation Deformation

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Model-scale tests to examine water pressures acting on potentially buoyant underground structures in clay strata

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第3期14卷 861-872页

作者： Zhisheng Ren Qixian Lu Kaiwen Liu Pengpeng Ni Guoxiong Mei School of Civil Engineering Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Guangdong Key Laboratory of Oceanic Civil EngineeringGuangdong Research Center for Underground Space Exploitation TechnologySun Yat-sen UniversityGuangzhou510275China Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education College of Civil Engineering and ArchitectureGuangxi UniversityNanning530004China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan430072China Key Laboratory of High-speed Railway Engineering(MOE) School of Civil EngineeringSouthwest Jiaotong UniversityChengdu610031China

Throughout the service life, underground structures are subjected to transient and sustained hydrostatic pressures. The reservoir impoundment results in an increase in water level, as well as hydraulic gradient,which can endanger the uplift performance of infrastructure. In uplift design, a reduction factor is often suggested for buoyant force acting on underground structures in clays due to the time lag ***, the mechanism of pore pressure generation in clays is not fully understood. This investigation presents a novel U-shaped test chamber to assess the pore pressure generation with time in the horizontal branch subjected to an increase in reservoir level in the left vertical branch. A mathematical model is developed to explain the time lag effect of pore pressure generation. The test program also involves the evaluation of uplift pressure acting on foundation model in the right vertical branch due to adjacent reservoir impoundment. It is found that the time lag effect of pore pressure generation in clays can be observed irrespective of hydraulic gradient, but a higher hydraulic gradient can lead to a faster response in pore pressure sensors. A reduction factor of 0.84-0.87 should be considered to reduce the conservatism of uplift design.

关键词： Buoyant force Reservoir impoundment Pore pressure generation Reduction factor Uplift pressure Time lag effect

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Development of a pressure coring system for the investigation of deep underground exploration

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International Journal of Mining Science and technology 2023年第11期33卷 1351-1364页

作者： Da Guo Ling Chen Zhongya Zhou Dingming Wang Yiwei Zhang Xun Yang Xin Fang Xiaojun Wang Heping Lu Lin Dai Heping Xie State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep underground Engineering Sichuan UniversityChengdu 610065China School of Mechanical Engineering Sichuan UniversityChengdu 610065China guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China Petroleum Engineering technology research Institute of Sinopec Jianghan Oilfield Company Wuhan 430035China

To provide a more accurate evaluation of the scale of deep underground resources,a new pressure coring system was carefully developed and its strength and safety of the engineering were verified by theoretical analyses and numerical *** designed pressure coring system can obtain cores with length of 3 m and diameter of 50 mm at 70 *** results of the ball-drop operation experiment demonstrate that differential motion assembly can effectively cut a safety pin by applying a tensile force of 4852 N,and it can lift the core tube through the center pole to complete a series of mechanical actions to seal the ***,by maintaining pressures at 70 MPa for 30 min,the pressure sealing capacity of the system was ***,a core sample with a diameter of 50 mm was obtained through a core drilling experiment and the coring performance of the pressure coring system was *** study can not only enrich the existing onshore coring technology but also provide a theoretical guide and design criteria for the development of similar pressure coring systems to meet the demand for deeper underground exploration.

关键词： underground exploration In-situ coring Pressure coring Oil and gas production

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Selection and thermal physical characteristics analysis of in-situ condition preserved coring lunar rock simulant in extreme environment

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International Journal of Mining Science and technology 2023年第11期33卷 1411-1424页

作者： Haichun Hao Mingzhong Gao Cunbao Li Xuan Wang Yan Wu Zheng Gao Wen Yu Xuemin Zhou guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Deep underground Engineering Sciences and Green Energy Shenzhen UniversityShenzhen 518060China center for Lunar and Planetary Sciences Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China

With the increasing scarcity of Earth’s resources and the development of space science and technology,the exploration, development, and utilization of deep space-specific material resources(minerals, water ice, volatile compounds, etc.) are not only important to supplement the resources and reserves on Earth but also provide a material foundation for establishing extraterrestrial research bases. To achieve large depth in-situ condition-preserved coring(ICP-Coring) in the extreme lunar environment, first, lunar rock simulant was selected(SZU-1), which has a material composition, element distribution, and physical and mechanical properties that are approximately equivalent to those of lunar mare basalt. Second, the influence of the lunar-based in-situ environment on the phase, microstructure, and thermal physical properties(specific heat capacity, thermal conductivity, thermal diffusivity, and thermal expansion coefficient)of SZU-1 was explored and compared with the measured lunar rock data. It was found that in an air atmosphere, low temperature has a more pronounced effect on the relative content of olivine than other temperatures, while in a vacuum atmosphere, the relative contents of olivine and anorthite are significantly affected only at temperatures of approximately-20 and 200 ℃. When the vacuum level is less than100 Pa, the contribution of air conduction can be almost neglected, whereas it becomes dominant above this threshold. Additionally, as the testing temperature increases, the surface of SZU-1 exhibits increased microcracking, fracture opening, and unevenness, while the specific heat capacity, thermal conductivity,and thermal expansion coefficient show nonlinear increases. Conversely, the thermal diffusivity exhibits a nonlinear decreasing trend. The relationship between thermal conductivity, thermal diffusivity, and temperature can be effectively described by an exponential function(R^(2)>0.98). The research results are consistent with previous studies

关键词： Lunar-based Lunar rock simulant Extreme environment Thermal physical properties

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research progress and application of deep in-situ condition preserved coring and testing

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International Journal of Mining Science and technology 2023年第11期33卷 1319-1337页

作者： Heping Xie Yunqi Hu Mingzhong Gao Ling Chen Ru Zhang Tao Liu Feng Gao Hongwei Zhou Xiaobo Peng Xiongjun Li Jianbo Zhu Cunbao Li Ruidong Peng Yanan Gao Cong Li Jianan Li Zhiqiang He State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep underground Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065China State Key Laboratory of Intelligent Construction and Health Operation and Maintenance of Deep Earth Engineering Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and UtilizationInstitute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China School of Mechanical Engineering Sichuan UniversityChengdu 610065China Institute of New Energy and Low-Carbon technology Sichuan UniversityChengdu 610065China Frontier Science research center for Fluidized Mining of Deep underground Resources China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology-BeijingBeijing 100083China

With the depletion of shallow resources,the exploration of deep earth resources has become a global *** study of the different patterns in the physical mechanical properties of rocks at different occurrence depths is the basis for exploring deep into the earth,with the core and premise being the acquisition and testing of deep in-situ core *** on the original idea of deep in-situ condition preserved coring(ICP-Coring)and testing,combined with theoretical modeling,numerical analysis,test platform development,indoor testing and engineering application,the principles and technologies of deep ICP-Coring are *** principle and technology consists of five parts:in-situ pressurepreserved coring(IPP-Coring),in-situ substance-preserved coring(ISP-Coring),in-situ temperaturepreserved coring(ITP-Coring),in-situ light-preserved coring(ILP-Coring),and in-situ moisturepreserved coring(IMP-Coring).The theory and technology of temperature and pressure reconstruction at different occurrence depths and in different environments are proposed,and prototype trial production was completed by following the principle of displacement and tests based on the in-situ reconstructed *** notable advances are as follows:(1)Deep in-situ coring system:A pressure-preserved controller with an ultimate bearing capacity greater than 140 MPa,highperformance(temperature-resistant,pressure-resistant,and low thermally conductive)temperaturepreserved materials,an active temperature control system,and high-barrier quality-preserved membrane materials were developed;a deep ICP-Coring capacity calibration platform was independently developed,a deep in-situ coring technology system was developed,and the acquisition of deep in-situ cores was realized.(2)In-situ storage displacement system:Following the dual-circuit hydraulic design idea,a single-drive source push-pull composite grabbing mechanism was designed;the design of the overall structure for the deep in-situ displ

关键词： Deep mining Deep in-situ Coring Displacement Test

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International experience of carbon neutrality and prospects of key technologies:Lessons for China

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Petroleum Science 2023年第2期20卷 893-909页

作者： Zheng-Meng Hou Ying Xiong Jia-Shun Luo Yan-Li Fang Muhammad Haris Qian-Jun Chen Ye Yue Lin Wu Qi-Chen Wang Liang-Chao Huang Yi-Lin Guo Ya-Chen Xie Institute of Subsurface Energy Systems Clausthal University of TechnologyClausthal-Zellerfeld38678Germany School of Earth and space Sciences Peking UniversityBeijing100871China State Key Laboratory of Oil and Gas Reservoir Geology and exploitation Southwest Petroleum UniversityChengdu610500SichuanChina Sino-German Energy research center Sichuan UniversityChengdu610065SichuanChina Department of Petroleum&Gas Engineering University of Engineering&Technology54890LahorePakistan Yunnan Key Lab.of Sino-German Blue Mining and Utilization of Special underground space Kunming650093YunnanChina Sino-German research Institute of Carbon Neutralization and Green Development Zhengzhou UniversityZhengzhou450000HenanChina State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071HubeiChina

Carbon neutrality(or climate neutrality)has been a global consensus,and international experience exchange is *** the differences in the degree of social development,resource endowment and technological level,each country should build a carbon-neutral plan based on its national *** with other major developed countries(e.g.,Germany,the United States and Japan),China's carbon neutrality has much bigger challenges,including a heavy and time-pressured carbon reduction task and the current energy structure that is over-dependent on fossil *** we provide a comprehensive review of the status and prospects of the key technologies for low-carbon,near-zero carbon,and negative carbon *** innovations associated with coal,oil-gas and hydrogen industries and their future potential in reducing carbon emissions are particularly explained and *** on integrated analysis of international experience from the world's major developed countries,in-depth knowledge of the current and future technologies,and China's energy and ecological resources potential,five lessons for the implementation of China's carbon neutrality are proposed:(1)transformation of energy production pattern from a coal-dominated pattern to a diversified renewable energy pattern;(2)renewable power-to-X and large-scale underground energy storage;(3)integration of green hydrogen production,storage,transport and utilization;(4)construction of clean energy systems based on smart sector coupling(ENSYSCO);(5)improvement of ecosystem carbon sinks both in nationwide forest land and potential desert in Northwest *** paper provides an international perspective for a better understanding of the challenges and opportunities of carbon neutrality in China,and can serve as a theoretical foundation for medium-long term carbon neutral policy formulation.

关键词： International experience Carbon reduction technologies Carbon neutrality Energy transition underground energy storage Carbon capture,utilization and storage(CCUS)

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Large-Scale underground Storage of Renewable Energy Coupled with Power-to-X:Challenges,Trends,and Potentials in China

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Engineering 2023年第10期29卷 15-21页

作者： Yachen Xie Jiashun Luo Zhengmeng Hou Gensheng Li Jianhua Liu Jianwei Tang Liangchao Huang Hans-Peter Beck Chunhe Yang Sino-German research Institute of Carbon Neutralization and Green Development Zhengzhou UniversityZhengzhou 450000China research Centre of Energy Storage Technologies Clausthal University of TechnologyGoslar 38640Germany Sino–German Energy research center Sichuan UniversityChengdu 610065China State Key Laboratory of Oil and Gas Reservoir Geology and exploitation Southwest Petroleum UniversityChengdu 610500China State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China Yunnan Key Laboratory of Sino–German Blue Mining and Utilization of Special underground space Kunming 650093China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China

*** Promoting the green and low-carbon transition of energy systems and constructing a new renewable-dominated power system is essential to achieving carbon neutrality in China[1,2].Furthermore,implementing electrification and hydrogenation strategies to address energy consumption is necessary for a successful energy ***’s share of electricity in its total energy consumption is estimated to increase from 26%in 2021 to more than 70%by 2060.

关键词： transition constructing Storage

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