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Fatigue properties and constitutive model of Jintan salt rock subjected to complex cyclic loading

International Journal of Mining Science and Technology 2025年第1期35卷 121-133页

作者： Qingchuan He Jianfeng Liu Fei Wu Cunbao Li Jie Chen Renbo Gao Chunfeng Ye Shijie Zhu State key laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China State key laboratory of Hydraulics and Mountain River engineering Sichuan UniversityChengdu 610065China State key laboratory of Intelligent Construction and Healthy Operation and Maintenance of deep Underground engineering College of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China State key laboratory of Geomechanics and Geotechnical engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China

Salt cavern energy storage technology contributes to energy reserves and renewable energy *** study focuses on salt cavern gas storage in Jintan to assess the long-term stability of its surrounding rock under frequent *** fatigue test results indicate that stress holding significantly reduces fatigue life,with the magnitude of stress level outweighing the duration of holding time in determining peak *** a machine learning approach,the impact of various factors on fatigue life and peak strain was quantified,revealing that higher stress limits and stress holding adversely impact the fatigue index,whereas lower stress limits and rate exhibit a positive effect.A novel fatigue-creep composite damage constitutive model is constructed,which is able to consider stress magnitude,rate,and stress *** model,validated through multi-path tests,accurately captures the elasto-viscous behavior of salt rock during loading,unloading,and stress *** analysis further reveals the time-and stress-dependent behavior of model parameters,clarifying that strain changes stem not only from stress variations but are also influenced by alterations in elasto-viscous *** study provides a new method for the mechanical assessment of salt cavern gas storage surrounding rocks.

关键词： Salt cavern gas storage Cyclic loading Fatigue characteristics Constitutive model

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Insight into the particle shape on the impact of dry granular flow against a rigid barrier: A DEM study

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Journal of Earth Science 2025年

作者： Rui-Xiao Zhan Dong Su Xiang-Sheng Chen Yuan-Jun Jiang Guo-Ping Lei Jing-Jing Yu key laboratory for Resilient Infrastructures of Coastal Cities (MOE)， shenzhen University College of Civil and Transportation engineering， shenzhen University School of Architecture and Urban Planning， shenzhen University shenzhen key laboratory of green， Efficient and Intelligent Construction of Underground Metro Station， shenzhen University Institute of Mountain Hazards and Environment， Chinese Academy of sciences School of Transportation， Civil engineering & Architecture， Foshan University

The effect of particle shape on the impact of dry granular flow remains an open area for further investigation. Five distinct particle shapes were examined in this study using discrete element simulations after calibrating the numerical model using a published work. The findings indicated that the particle shape had a significant influence on granular mobility. With negligible variations in normalized kinetic energy between particles of different shapes， the effect of particle shape on the increasing rate of kinetic energy became more obvious. All irregular particle scenarios had longer accumulated particle lengths down the channel than spherical particles. Variations in particle shape led to adjustments in the distribution of impact forces on the barrier. These findings substantially enhance our understanding of the distinctive effects of particle shapes on the impact mechanism of dry granular flow.

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水对不同深度应力条件下煤岩动态力学特性的影响（英文）

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Journal of Central South University 2025年第01期 220-228页

作者：李圣伟高明忠李业学王俊曾刚 Hubei key laboratory of Vehicle-infrastructure Cooperation and Traffic Control School of Civil Engineering and Architecture Hubei University of Arts and Science State key laboratory of Hydraulics and Mountain River engineering College of Water Resources and Hydropower Sichuan University State key laboratory of Intelligent Construction and Healthy Operation and Maintenance of deep Underground engineering Shenzhen University Guangdong Provincial key laboratory of deep Earth sciences and Geothermal energy Exploitation and Utilization Institute of Deep Earth Sciences and Green Energy College of Civil and Transportation Engineering Shenzhen University

煤层注水是预防煤矿冲击地压的有效技术措施之一。本文采用改进的分离式霍普金森压杆装置，对饱和水状态下的煤岩施加三向相等的静态应力模拟不同深度煤岩的初始应力环境，然后开展不同深度饱和水状态下煤岩的动态力学实验，研究饱和水... 详细信息

煤层注水是预防煤矿冲击地压的有效技术措施之一。本文采用改进的分离式霍普金森压杆装置，对饱和水状态下的煤岩施加三向相等的静态应力模拟不同深度煤岩的初始应力环境，然后开展不同深度饱和水状态下煤岩的动态力学实验，研究饱和水和深度对煤岩动态力学性质的影响。研究结果表明：在单轴无侧向压缩时，煤岩在饱和水状态下，动态压缩强度出现不同程度的降低；不同深度应力条件下煤岩在饱和水状态下相对于自然状态下的动态压缩强度有所减弱，但是与0 m时的差异性相比，200、400、600和800 m深度应力条件下煤岩在饱和水状态下动态压缩强度降低的幅度减少了很多。研究成果可为煤矿动力灾害的防治提供基础理论依据。

关键词：煤开采深度饱和水分离式霍普金森压杆动态压缩强度

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Size effect of fracture characteristics for anisotropic quasi-brittle geomaterials

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International Journal of Mining Science and Technology 2023年第2期33卷 201-213页

作者： Cunbao Li Dongchao Yang Heping Xie Li Ren Jun Wang Guangdong Provincial key laboratory of deep Earth sciences and Geothermal energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyShenzhen UniversityShenzhen 518060China shenzhen key laboratory of deep engineering sciences and green energy College of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China MOE laboratory of deep Earth Science and engineering Sichuan UniversityChengdu 610065China

Understanding the size effect exhibited by the fracture mechanism of anisotropic geomaterials is important for engineering practice. In this study, the anisotropic features of the nominal strength, apparent fracture toughness, effective fracture energy and fracture process zone(FPZ) size of geomaterials were first analyzed by systematic size effect fracture experiments. The results showed that the nominal strength and the apparent fracture toughness decreased with increasing bedding plane inclination *** larger the specimen size was, the smaller the nominal strength and the larger the apparent fracture toughness was. When the bedding inclination angle increased from 0° to 90°, the effective fracture energy and the effective FPZ size both first decreased and then increased within two complex variation stages that were bounded by the 45° bedding angle. Regardless of the inherent anisotropy of geomaterials,the nominal strength and apparent fracture toughness can be predicted by the energy-based size effect law, which demonstrates that geomaterials have obvious quasi-brittle characteristics. Theoretical analysis indicated that the true fracture toughness and energy dissipation can be calculated by linear elastic fracture mechanics only when the brittleness number is higher than 10;otherwise, size effect tests should be adopted to determine the fracture parameters.

关键词： Size effect Inherent anisotropy Fracture toughness Fracture energy Effective FPZ size Quasi-brittle geomaterials

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Experimental study on the mechanical and failure behaviors of deep rock subjected to true triaxial stress:A review

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International Journal of Mining Science and Technology 2022年第5期32卷 915-950页

作者： Heping Xie Jun Lu Cunbao Li Minghui Li Mingzhong Gao Guangdong Provincial key laboratory of deep Earth sciences and Geothermal energy Exploitation and Utilization College of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518000China shenzhen key laboratory of deep Underground engineering Science and green energy Shenzhen UniversityShenzhen 518000China Institute of deep Earth sciences and green energy Shenzhen UniversityShenzhen 518000China

It has become an inevitable trend of human development to seek resources from the deep ***,rock encountered in deep underground engineering is usually in an anisotropic stress state(σ_(1)>σ>σ_(3))due to the influences of geological structures and engineering *** is therefore essential to study the mechanical,seepage,and dynamic disaster behaviors of deep rock under true triaxial stress to ensure the safe operation of deep rock engineering and the efficient exploitation of deep *** recent years,experimental techniques and research on true triaxial rock mechanics have achieved fruitful results that have promoted the rapid development of deep rock mechanics;thus,it is necessary to systematically review and summarize these *** work first introduced several typical true triaxial testing apparatus and then reviewed the corresponding research progress on rock deformation,strength,failure mode,brittleness,and energy as well as the 3D volumetric fracturing(dynamic disaster)properties of deep rocks under true triaxial ***,several commonly used true triaxial rock strength criteria and their applicability,the permeability characteristics and mathematical models of deep reservoir rocks,and the disaster-causing processes and mechanisms of disturbed volumetric fracturing(rockburst,compound dynamic disasters)in deep rock engineering were *** work may provide an essential reference for addressing the true triaxial rock mechanics issues involved in deep rock engineering,especially regarding the stability of surrounding rock at depth,disaster prevention and control,and oil and gas exploitation.

关键词： True triaxial stress deep rock mass Mechanical properties Strength criterion Permeability characteristics Dynamic disaster

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Design,test,and verification of in-situ condition preserved coring and analysis system in lunar-based simulation environment

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International Journal of Mining Science and Technology 2024年第9期34卷 1259-1272页

作者： Haichun Hao Mingzhong Gao Yan Wu Zheng Gao Yongcheng Li Xuemin Zhou Peng Chu Xuan Wang Jiahua Li Lang Zhou Jie Song Tianxiang Ao Yikun Yang State key laboratory of Intelligent Construction and Healthy Operation and Maintenance of deep Underground engineering Shenzhen UniversityShenzhen 518060China 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

The lunar surface and its deep layers contain abundant resources and valuable information resources,the exploration and exploitation of which are important for the sustainable development of the human economy and *** exploration and research in the field of deep space science,especially lunar-based exploration,is a scientific strategy that has been pursued in China and *** and sampling are key to accurate exploration of the desirable characteristics of deep lunar *** this study,an in-situ condition preserved coring(ICP-Coring)and analysis system,which can be used to test drilling tools and develop effective sampling strategies,was *** key features of the system include:(1)capability to replicate the extreme temperature fluctuations of the lunar environment(-185 to 200℃)with intelligent temperature control;(2)ability to maintain a vacuum environment at a scale of 10^(-3) Pa,both under unloaded conditions within Ф580 mm×1000 mm test chamber,and under loaded conditions using Ф400 mm×800 mm lunar rock simulant;(3)application of axial pressures up to 4 MPa and confining pressures up to 3.5 MPa;(4)sample rotation at any angle with a maximum sampling length of 800 mm;and(5)multiple modes of rotary-percussive drilling,controlled by penetration speed and weight on bit(WOB).Experimental studies on the drilling characteristics in the lunar rock simulant-loaded state under different drill bit-percussive-vacuum environment configurations were *** results show that the outgassing rate of the lunar soil simulant is greater than that of the lunar rock simulant and that a low-temperature environment contributes to a reduced vacuum of the lunar-based simulated *** rotary-percussive drilling method effectively shortens the sampling *** increasing sampling depth,the temperature rise of the drilling tools tends to rapidly increase,followed by slow growth or steady *** temperature rise energy accu

关键词： Lunar-based Large temperature difference Vacuum Drilling and coring System design

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A novel fractal-statistical scaling model of rocks considering strain rate

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Journal of Rock Mechanics and Geotechnical engineering 2023年第11期15卷 2831-2841页

作者： Changtai Zhou Heping Xie Zhihe Wang Tao Zhou Jianbo Zhu 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 UniversityShenzhen518060China shenzhen key laboratory of deep Underground engineering sciences and green energy Shenzhen UniversityShenzhen518060China

The scaling-dependent behaviors of rocks are significant to the stability and safe operation of the structures built in or on rock masses for practical ***,many size effect models are employed to connect laboratory measurements at small scales and engineering applications at large ***,limited works consider the strain rate *** this study,an fractal-statistical scaling model incorporating strain rate is proposed based on a weakest-link approach,fractal theory and dynamic fracture *** proposed scaling model consists of 8 model parameters with physical meaning,***-dependent parameter,intrinsic material parameter,dynamic strain rate,quasi-static strain rate,quasi-static fracture toughness,micro-crack size,micro-crack intensity and fractal dimension,enabling the proposed scaling model to model the scaling behaviors under different external *** predictions are consistent with experimental data on red sandstone,proving the reliability and effectiveness of the proposed scaling ***,the scaling behaviors of rocks under dynamic loading conditions can be captured by the proposed fractal-statistical scaling *** sensitivity analysis indicates that the nominal strength difference becomes more obvious with a higher strain rate,larger fractal dimension,smaller micro-crack size or lower micro-crack ***,the proposed scaling model has the potential to capture the scaling behaviors considering the thermal effect,weathering effect,anisotropic characteristic etc.,as the proposed scaling model incorporated model parameters with physical *** findings of this study are of fundamental importance to understand the scaling behaviors of rock under dynamic loading condition,and thus would facilitate the appropriate design of rock engineering.

关键词： Size effect Strain rate Uniaxial compressive strength(UCS) Dynamic fracture mechanics

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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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The role of natural fracture activation in hydraulic fracturing for deep unconventional geo-energy reservoir stimulation

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Petroleum Science 2023年第4期20卷 2141-2164页

作者： Jun Wang He-Ping Xie Stephan KMatthai Jian-Jun Hu Cun-Bao Li Guangdong Provincial key laboratory of deep Earth sciences and Geothermal energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyShenzhen UniversityShenzhen518060GuangdongPR China shenzhen key laboratory of deep engineering sciences and green energy College of Civil and Transportation EngineeringShenzhen UniversityShenzhen518060GuangdongPR China Department of Infrastructure engineering University of MelbourneMelbourneVIC3010Australia MOE laboratory of deep Earth Science and engineering Sichuan UniversityChengdu610065SichuanPR China

The presence of sealed or semi-sealed,multiscale natural fracture systems appears to be crucial for the successful stimulation of deep *** explore the reaction of such systems to reservoir stimulation,a new numerical simulation approach for hydraulic stimulation has been developed,trying to establish a realistic model of the physics *** new model successfully reproduces dynamic fracture activation,network generation,and overall reservoir permeability *** outputs indicate that natural fractures facilitate stimulation far beyond the near-wellbore area,and can significantly improve the hydraulic conductivity of unconventional geo-energy *** to our model,the fracture activation patterns are jointly determined by the occurrence of natural fractures and the in situ ***-density natural fractures,high-fluid pressure,and low effective stress environments promote the formation of complex fracture networks during *** or multicluster fracturing treatments with an appropriate spacing also increase the stimulated reservoir area(SRA).The simulation scheme demonstrated in this work offers the possibility to elucidate the complex multiphysical couplings seen in the field through detailed site-specific modeling.

关键词： Natural fractures DFM Unconventional geo-energy reservoir Fracture reactivation Hydraulic stimulation

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Changes in the thermodynamic properties of alkaline granite after cyclic quenching following high temperature action

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International Journal of Mining Science and Technology 2021年第5期31卷 843-852页

作者： Jianjun Hu Heping Xie Qiang Sun Cunbao Li Guikang Liu College of Water Resource and 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 EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China shenzhen key laboratory of deep Underground engineering sciences and green energy Shenzhen UniversityShenzhen 518060China Geological Research Institute for Coal green Mining Xi'an University of Science and TechnologyXi’an 710054China

During the development of hot dry rock,the research on thermal fatigue damage caused by thermal shock of cold and heat cycles is the basis that ensures the long-term utilization of geothermal resources,but there are not enough relevant studies at *** on this,the thermal damage tests of granite at different temperatures(250,350,450°C)and quenching cycles(1,5,10,15 cycles)were carried *** reveals the damage mechanism and heat transfer law of the quenching cycle effect on hot dry *** results show that with the increase of temperature and cycles,the uneven thermal expansion of minerals and the thermal shock caused by quenching promote the crack development of granite,resulting in the decrease of P-wave velocity,thermal conductivity and uniaxial compressive strength of ***,the COMSOL was used to simulate the heat transfer of hot dry rock under different heat treatment *** concluded that the increase in the number of quenching cycles reduced the heat transfer capacity of the granite,especially more than 10 quenching cycles,which also reflects that the thermal fatigue damage leads to a longer time for the temperature recovery of the hot dry rock *** addition,the three-dimensional nonlinear fitting relationship among thermal conductivity,temperature and cycle number was established for the first time,which can better reveal the change rule of thermal conductivity after quenching thermal fatigue effect of hot dry *** research results provide theoretical support for hot dry rock reservoir reconstruction and production efficiency evaluation.

关键词： Alkaline granite Quenching cycle Thermal conductivity P-wave velocity High-temperature deep rock

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