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Physical model investigation on effects of drainage condition and cement addition on consolidation behavior of tailings slurry within backfilled stopes

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International Journal of Minerals,Metallurgy and Materials 2023年第8期30卷 1490-1501页

作者： Qinghai Ma guangsheng liu Xiaocong Yang Lijie Guo School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China BGRIMM Technology Group Beijing 100160China National Centre for International Research on Green Metal Mining Beijing 100160China

Estimation of stressses within the tailings slurry during self-weight consolidation is a critical issue for cost-effective barricade design and efficient backfill planning in underground mine *** process requires a good understanding of self-weight consolidation behaviors of the tailings slurry within practical stopes,where many factors can have significant effects on the consolidation,including drainage condition and cement *** this paper,the prepared tailings slurry with different cement contents(0,4.76wt%,and 6.25wt%)was poured into1.2 m-high columns,which allowed three drainage scenarios(undrained,partial lateral drainage near the bottom part,and full lateral drainage boundaries)to investigate the effects of drainage condition and cement addition on the consolidation behavior of the tailings *** consolidation behavior was analyzed in terms of pore water pressure(PWP),settlement,volume of drainage water,and residual water *** results indicate that increasing the length of the drainage boundary or cement content aids in PWP *** addition,constructing an efficient drainage boundary was more favorable to PWP dissipation than increasing cement *** final stable PWP on the column floor was not sensitive to cement *** final settlement of uncemented tailings slurry was independent of drainage conditions,and that of cemented tailings slurry decreased with the increase in cement ***,more pore water can drain out from the cemented tailings slurry than the uncemented tailings slurry during consolidation.

关键词： tailings backfill consolidation slurry drainage cement content physical model test

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Effects of Elevated Air Temperatures on Soil Thermal and Hydrologic Processes in the Active Layer in an Alpine Meadow Ecosystem of the Qinghai-Tibet Plateau

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Journal of Mountain Science 2012年第2期9卷 243-255页

作者： BAI Wei WANG Genxu liu guangsheng School of Environmental and Municipal Engineering Lanzhou Jiaotong UniversityLanzhou 730070China College of Resource and Environmental Science Lanzhou UniversityLanzhou 730000China Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China

In this study,effects of elevated air temperatures on thermal and hydrologic process of the shallow soil in the active layer were investigated. Open-top chambers(OTCs)were utilized to increase air temperatures 1-2℃ in OTC-1 and 3-5℃ in OTC-2 in the alpine meadow ecosystem on the Qinghai- Tibetan *** show that the annual air temperatures under OTC-1 and OTC-2 were 1.21℃ and 3.62℃ higher than the Control,*** entirely-frozen period of shallow soil in the active layer was shortened and the fully thawed period was prolonged with temperature *** maximum penetration depth and duration of the negative isotherm during the entirely-frozen period decreased, and soil freezing was retarded in the local scope of the soil profile when temperature ***, the positive isotherm during the fully-thawed period increased,and the soil thawing was *** moisture under different manipulations decreased with the temperature increase at the same depth. During the early freezing period and the early fully- thawed period,the maximum soil moisture under the Control manipulation was at 0.2 m deep,whereas under OTC-1 and OTC-2 manipulations,the maximum soil moisture were at 0.4-0.5 m deep. These results indicate that elevated temperatures led to a decrease of the moisture in the surface *** coupled relationship between soil temperature and moisture was significantly affected by the temperature *** the freezing and thawing processes, the soil temperature and moisture under different manipulations fit the regression model given by the equationθV=a/{1+exp[b(TS+c)]}+d.

关键词： Thermal and hydrologic process Temperature Open-top chambers Alpine meadow Qinghai-Tibetan Plateau

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Stability analyses of vertically exposed cemented backfill:A revisit to Mitchell's physical model tests

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International Journal of Mining Science and Technology 2016年第6期26卷 1135-1144页

作者： liu guangsheng Li Li Yang Xiaocong Guo Lijie School of Civil and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Department of Civil Geological and Mining EngineeringEcole Polytechnique de MontrealMontreal H3C3A7Canada Beijing General Research Institute of Mining and Metallurgy Beijing 100160China

Mitchell's solution is commonly used to determine the required strength of vertically exposed cemented backfill in mines. Developed for drained backfill, Mitchell model assumed a zero friction angle for the backfill. Physical model tests were performed. Good agreements were obtained between the required strengths predicted by the analytical solution and experimental results. However, it is well-known that zero friction angle can only be possible in terms of total stresses when geomaterials are submitted to unconsolidated and undrained conditions. A revisit to Mitchell's physical model tests reveals that both the laboratory tests performed for obtaining the shear strength parameters of the cemented backfill and the box stability tests were conducted under a condition close to undrained condition. This explains well the good agreement between Mitchell's solution and experimental results. Good agreements are equally obtained between Mitchell's experimental results and FLAC3 D numerical modeling of shortterm stability analyses of exposed cemented backfill.

关键词： Cemented backfill Required strength Mitchell Physical model tests Numerical modeling FLAC3D

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Influence of short-term experimental warming on heat-waterprocesses of the active layer in a swamp meadow ecosystemof the Qinghai-Tibet Plateau

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Research in Cold and Arid Regions 2016年第2期8卷 125-134页

作者： guangsheng liu GenXu Wang College of Environmental Science and Engineering Xiamen University of TechnologyXiamenFujian 361024China Key Laboratory of Mountain Surface Processes and Ecological Regulation Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengduSichuan 610041China

Climate change is now evident in the Qinghai-Tibet Plateau(QTP), with impacts on the alpine ecosystem, particularly on water and heat balance between the active layer and the atmosphere. Thus, we document the basic characteristics of changes in the water and heat dynamics in response to experimental warming in a typical alpine swamp meadow ecosystem. Data sets under open top chambers(OTC) and the control manipulations were collected over a complete year. The results show that annual(2008) air temperatures of OTC-1 and OTC-2 were 6.7 °C and 3.5 °C warmer than the control. Rising temperature promotes plant growth and development. The freeze-thaw and isothermal days of OTCs appeared more frequently than the control, owing to comparably higher water and better vegetation conditions. OTCs soil moisture decreased with the decrease of soil depth; however, there was an obviously middle dry aquifer of the control, which is familiar in QTP. Moreover, experimental warming led to an increase in topsoil water content due to poorly drained swamp meadow ecosystem with higher organic matter content and thicker root horizons. The results of this study will have some contributions to alpine cold ecosystem water-heat process and water cycle under climate change.

关键词： experimental warming open top chamber Qinghai-Tibet Plateau soil moisture soil temperature alpine swamp meadow ecosystem

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Response of soil heat-water processes to vegetation cover on the typical permafrost and seasonally frozen soil in the headwaters of the Yangtze and Yellow Rivers

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Chinese Science Bulletin 2009年第7期54卷 1225-1233页

作者： HU HongChang WANG GenXu WANG YiBo liu guangsheng LI TaiBing REN DongXing College of Resources and Environment Lanzhou University Lanzhou 730000 China Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China

The response of soil temperature and moisture to vegetative cover in the active layer of permafrost and seasonally frozen soil were assessed and compared. Soil temperature and moisture, under a range of vegetation covers (92%, 65% and 30%) in the permafrost and vegetation covers (95%, 70%―80%, 40%―50% and 10%) in the seasonally frozen soil, were measured on a daily basis. A decline in vege-tation cover led to a decrease in the integral of freezing depth of active permafrost layer, but an increase in seasonally frozen soil. The maximum invasion depth and duration of the negative isotherm during the frozen period and of the positive isotherm during the non-frozen period clearly increased when vegetation cover declined. With a reduction of vegetation cover, the soil moisture in the active layer of the permafrost decreased for depths of 0.20―0.60 m, but increased for depths of 0.60―0.80 m, while for seasonally frozen soil, soil moisture of the entire profile (0.10―1.20 m) increased. Variation in vegetation cover alters soil heat-water processes, but the response to it is different between permafrost and seasonally frozen soil.

关键词：季节性冻土植被覆盖度永久冻土层土壤水分土壤热进程黄河长江

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Numerical Analysis of Dynamical Effects Associated with a Plugging String in a Horizontal Well

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Fluid Dynamics & Materials Processing 2023年第5期19卷 1203-1214页

作者： guangsheng liu Qingming Gan WenWu Haitao Yang Yiming Lv Wenhao Cui Wei Lin Oil and Gas Technology Research Institute Changqing Oilfield Company PetroChinaXi’an710018China National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields PetroChina Xi’an710018China Shunan Gas Mine PetroChina Southwest Oil and Gas Field CompanyLuzhou646000China College of Engineering Southwest Petroleum UniversityNanchong637001China

The finite element method has been applied to simulate the dynamics of a water plugging string in a complex horizontal well of a low-permeability *** force associated with the pipe string and the packer has been determined under the sucking action of the oil well *** analysis has been conducted for a real drilling well,taking into account the process of lifting,lowering,unblocking and water *** between field measured data and simulation data indicates that the model is reliable and *** packer creep effect under different pressure differences has also been investigated in the framework of the same model.

关键词： Water plugging string horizontal well creep effect mechanical water plugging

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Optics of Intense Light and Its Applications

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Chinese Journal of Lasers 1995年第3期 287-288页

作者： liu Songhao and HE guangsheng

ＯｐｔｉｃｓｏｆＩｎｔｅｎｓｅＬｉｇｈｔａｎｄＩｔｓＡｐｐｌｉｃａｔｉｏｎｓ￥ｂｙＬＩＵＳｏｎｇｈａｏａｎｄＨＥＧｕａｎｇｓｈｅｎｇ（ＢｏｏｋＮｏ：ＩＳＢＮ７－５３５９－１１０２）Ａｎｅｗｂｏｏｋ＂Ｏｐｔｉｃｓｏｆｉ... 详细信息

ＯｐｔｉｃｓｏｆＩｎｔｅｎｓｅＬｉｇｈｔａｎｄＩｔｓＡｐｐｌｉｃａｔｉｏｎｓ￥ｂｙＬＩＵＳｏｎｇｈａｏａｎｄＨＥＧｕａｎｇｓｈｅｎｇ（ＢｏｏｋＮｏ：ＩＳＢＮ７－５３５９－１１０２）Ａｎｅｗｂｏｏｋ＂ＯｐｔｉｃｓｏｆｉｎｔｅｎｓｅＬｉｇｈｔａｎｄｉｔｓ...

关键词： Optics of Intense Light and Its Applications

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The Analysis of the Spurious Field about HL-2A Tokamak

Southwestern Institute of Physics Annual Report

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Southwestern Institute of Physics Annual Report 2004年第1期 67-69页

作者： SONG Shaodong LI guangsheng liu Yong

To better the shielding of outer magnetic field when making the experiment on neutral particle measurement and neutral beam injection outside of HL-2A, it would be necessary to determine the distribution of outer magn... 详细信息

关键词： Spurious field Excitation coils

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Research on Convergence Network of EPON and WiMAX Based on ROF

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ZTE Communications 2010年第3期8卷 56-58页

作者： Zhang Shu liu Deming Wu guangsheng College of Optoelectronic Science and Engineering Huazhong University of Science and Technology Wuhan 430074 P. R. China

Convergence of optical and wireless networks is a promising development for future access network architecture. A Radio over Fiber （ROF）-based network that converges Ethernet Passive Optical Network （EPON） and Worldwide Interoperability for Microwave Access （WiMAX） technologies makes it possible to simultaneously transmit EPON baseband signals and WiMAX wireless Radio Frequency （RF） signals. This article elaborates on uplink and downlink transmission, redundancy protection, and roaming features of such a network.

关键词： ROF Based WiMAX EPON Passive Optical Network Worldwide Interoperability for Microwave Access wireless networks downlink transmission Radio Frequency access network development features Ethernet future based

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Designing Electronic Structures of Multiscale Helical Converters for Tailored Ultrabroad Electromagnetic Absorption

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Nano-Micro Letters 2025年第1期17卷 439-455页

作者： Zhaobo Feng Chongbo liu Xin Li guangsheng Luo Naixin Zhai Ruizhe Hu Jing Lin Jinbin Peng Yuhui Peng Renchao Che Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle School of Environmental and Chemical EngineeringNanchang Hangkong UniversityNanchang 330063People’s Republic of China School of Physics and Materials Nanchang UniversityNanchang 330031People’s Republic of China Key Laboratory of Nondestructive Testing Ministry of EducationNanchang Hangkong UniversityNanchang 330063People’s Republic of China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsAcademy for Engineering and TechnologyFudan UniversityShanghai 200438People’s Republic of China

Atomic-scale doping strategies and structure design play pivotal roles in tailoring the electronic structure and physicochemical property of electromagnetic wave absorption(EMWA)***,the relationship between configuration and electromagnetic(EM)loss mechanism has remained ***,drawing inspiration from the DNA transcription process,we report the successful synthesis of novel in situ Mn/N co-doped helical carbon nanotubes with ultrabroad EMWA *** calculation and EM simulation confirm that the orbital coupling and spin polarization of the Mn–N4–C configuration,along with cross polarization generated by the helical structure,endow the helical converters with enhanced EM *** a result,HMC-8 demonstrates outstanding EMWA performance,achieving a minimum reflection loss of−63.13 dB at an ultralow thickness of 1.29 *** precise tuning of the graphite domain size,HMC-7 achieves an effective absorption bandwidth(EAB)of 6.08 GHz at 2.02 mm ***,constructing macroscale gradient metamaterials enables an ultrabroadband EAB of 12.16 GHz at a thickness of only 5.00 mm,with the maximum radar cross section reduction value reaching 36.4 dB *** innovative approach not only advances the understanding of metal–nonmetal co-doping but also realizes broadband EMWA,thus contributing to the development of EMWA mechanisms and applications.

关键词： Metal-nonmetal co-doping 3d-2p orbital coupling Spin polarization Helical structure Broadband EM wave absorption

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