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Influence of advanced engineering measures on displacement and stress field of surrounding rock in tunnels crossing active strike-slip faults

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Frontiers of Structural and Civil engineering 2023年第10期17卷 1477-1501页

作者： Hui ZHOU Jiancheng XIAO Manchao HE Jingjing LU Zhigang TAO Futong XU Congcong HOU State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyBeijing 100083China School of Mechanics and Civil Engineering China University of Mining and TechnologyBeijing 100083China

Based on significant improvements in engineering materials,three advanced engineering measures have been proposed-super anchor cables,high-strength concrete anti-fault caverns,and grouting modification using high-strength concrete-to resist fault dislocation in the surrounding rock near tunnels crossing active strike-slip ***,single-or multiple-joint advanced engineering measures form the local rock mass-anti-fault(LRAF)method.A numerical method was used to investigate the influence of LRAF methods on the stress and displacement fields of the surrounding rock,and the anti-fault effect was ***,the mechanism of action of the anchor cable was verified using a three-dimensional numerical *** numerical results indicated that the anchor cable and grouting modification reduced the displacement gradient of the local surrounding rock near the tunnels crossing ***,anchor cable and grouting modifications changed the stress field of the rock mass in the modified *** tensile stress field of the rock mass in the modified anchor cable area was converted into a compressive stress *** stress field in the modified grouting area changed from shear stress in the fault slip direction to tensile stress in the axial tunnel *** anti-fault cavern resisted the dislocation displacement and reduced the maximum dislocation magnitude,displacement gradient,and shear *** the three advanced engineering measures,the anchor cable was the core of the three advanced engineering *** anchor cable,combined with other LRAF measures,can form an artificial safety island at the cross-fault position of the rock mass to protect the *** research results provide a new supporting idea for the surrounding rock of tunnels crossing active strike-slip faults.

关键词： anti-fault effect engineering measures LRAF method stress and displacement field tunnel-crossing active faults

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Excavation compensation and bolt support for a deep mine drift

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Journal of Rock Mechanics and Geotechnical engineering 2024年第8期16卷 3206-3220页

作者： Longji Guo Zhigang Tao Manchao He Massimo Coli State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology(Beijing)Beijing100083China School of Mechanics&Civil Engineering China University of Mining and Technology(Beijing)Beijing100083China Department of Earth Sciences University of FlorenceFirenze50121Italy

To overcome large deformation of deep phosphate rock roadways and pillar damage,a new type of constant-resistance large-deformation negative Poisson’s ratio(NPR)bolt that can withstand a high prestress of at least 130 KN was *** the conducted tests,the amount of deformation was 200-2000 mm,the breaking force reached 350 KN,and a high constant-resistance pre-stress was maintained during the deformation process.A stress compensation theory of phosphate rock excavation based on NPR bolts is proposed together with a balance system for bolt compensation of the time-space effect and high NPR *** split-set rock bolts are unable to maintain the stability of roadway roofs and *** verify the support effect of the proposed bolt,field tests were conducted using both the proposed NPR bolts and split-set rock bolts as support systems on the same mining *** addition,the stress compensation mechanism of roadway mining was simulated using the particle flow code in three dimensions(PFC^(3D))-fast Lagrangian analysis of continua(FLAC^(3D))particle-flow coupling numerical ***-site monitoring and numerical simulations showed that the NPR excavation compensation support scheme effectively improves the stress state of the bolts and reduces the deformation of the surrounding *** to the original support scheme,the final deformation of the surrounding rock was reduced by approximately 70%.These results significantly contribute to domestic and foreign research on phosphate-rock NPR compensation support technology,theoretical systems,and engineering practices,and further promote technological innovation in the phosphate rock mining industry.

关键词： deep phosphate rock NPR bolt Split-set rock bolt PFC3D-FLAC3D Compensation support

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不同温度下裂隙花岗岩法向刚度演变规律的试验研究

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Journal of Central South University 2023年第2期30卷 488-502页

作者：刘尚李树忱刘日成蔚立元王蓥森 State Key Laboratory for Geomechanics and Deep Underground Engineering(China University of Mining and Technology) Xuzhou 221116China

本文研究了不同温度下裂隙花岗岩试样的法向刚度演变规律,并系统阐述了裂隙岩体法向闭合过程中法向位移(δn)、初始开度(b)、温度(T)及饱和状态对试样法向刚度演变规律的影响。试验结果表明,随着法向位移的增加,法向刚度的变化速率逐渐... 详细信息

本文研究了不同温度下裂隙花岗岩试样的法向刚度演变规律,并系统阐述了裂隙岩体法向闭合过程中法向位移(δn)、初始开度(b)、温度(T)及饱和状态对试样法向刚度演变规律的影响。试验结果表明,随着法向位移的增加,法向刚度的变化速率逐渐增大,呈现出二次函数关系。当法向位移相同时,初始开度较大试样法向刚度相对较小。对于不同初始开度的试样,当旋转角度(α)为20°且δ_(n)=1 mm时,饱和试样的刚度随着温度的升高(从25℃到600℃)而降低48.18%。当T=25℃且α=20°时,干燥和饱和试件刚度分别为27.31×10^(3)MPa/m和19.32×10^(3)MPa/m。提出了两个经验模型来预测干燥与饱和状态下裂隙花岗岩试样在不同温度、初始开度和法向应变等参数下的法向刚度变化规律,预测结果与实验结果吻合良好。

关键词：裂隙法向刚度初始开度温度干燥及饱和条件

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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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基于大变形升阻锚索深埋巷道围岩稳定性控制研究

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Journal of Central South University 2024年第2期31卷 558-575页

作者：孟波尹乾靖洪文刘盛东贾邦国 School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou 221116China State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China Yunlong Lake Laboratory of Deep Underground Science and Engineering Xuzhou 221116China

研发了一种新型大变形升阻锚索支护结构,通过串联6个壁厚5 mm含环形V槽的直管型钢结构实现锚索吸能让压,吸能率为44.55 J/g。拉拔试验结果表明新型锚索极限变形量(221.58 mm)与普通传统锚索相比增加了4.87倍,具有大变形、增阻及高吸能... 详细信息

研发了一种新型大变形升阻锚索支护结构,通过串联6个壁厚5 mm含环形V槽的直管型钢结构实现锚索吸能让压,吸能率为44.55 J/g。拉拔试验结果表明新型锚索极限变形量(221.58 mm)与普通传统锚索相比增加了4.87倍,具有大变形、增阻及高吸能等优良性能。通过离散元UDEC程序的二次开发,模拟了新型大变形增阻锚索支护阻力−变形曲线的双弹性阶段。采用新型锚索对深埋巷道围岩支护效果数值模拟结果表明,与无支护及传统锚索支护相比,顶板下沉量分别减小了88.33%与74.64%,稳定状态下最大主应力峰值分别减小了23.15%与18.34%,塑性区厚度分别减小了37.50%与62.50%。最后将新型大变形增阻锚索成功应用于真实巷道,两帮最大收敛变形量约为300 mm,实现了较好的支护效果。

关键词：大变形增阻吸能结构锚索稳定控制工程应用

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Morphological complexity and azimuthal disorder of evolving pore space in low-maturity oil shale during in-situ thermal upgrading and impacts on permeability

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Petroleum Science 2024年第5期21卷 3350-3362页

作者： Jun Liu Yan-Bin Yao Derek Elsworth Key Laboratory of Deep Underground Science and Engineering(Ministry of Education) Institute of New Energy and Low-Carbon TechnologySichuan UniversityChengdu610065SichuanChin School of Energy Resource China University of Geosciences BeijingBeijing100083China Department of Energy and Mineral Engineering Pennsylvania State UniversityParkPA16802USA

In-situ thermal upgrading is used to tune the pore system in low-maturity oil shales. We introduce fractal dimension(D), form factor(ff) and stochastic entropy(H) to quantify the heating-induced evolution of pore morphological complexity and azimuthal disorder and develop a model to estimate the impact on seepage capacity via permeability. Experiments are conducted under recreated in-situ temperatures and consider anisotropic properties—both parallel and perpendicular to bedding. Results indicate that azimuthal distribution of pores in the bedding-parallel direction are dispersed, while those in the bedding-perpendicular direction are concentrated. D values indicate that higher temperatures reduce the uniformity of the pore size distribution(PSD) in the bedding-parallel direction but narrow the PSD in the bedding-perpendicular direction. The greater ff(> 0.7) values in the bedding-parallel direction account for a large proportion, while the dominated in the bedding-perpendicular direction locates within 0.2-0.7, for all temperatures. The H value of the bedding-parallel sample remains stable at ~0.925 during heating, but gradually increases from 0.808 at 25℃ to 0.879 at 500℃ for the beddingperpendicular sample. Congruent with a mechanistic model, the permeability at 500℃ is elevated~1.83 times(bedding-parallel) and ~6.08 times(bedding-perpendicular) relative to that at 25℃—confirming the effectiveness of thermal treatment in potentially enhancing production from low-maturity oil shales.

关键词： Low-maturity oil shale Fractal dimension Form factor Pore structure Fluid seepage capacity

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Numerical analysis on mechanical difference of sandstone under in-situ stress,pore pressure preserved environment at depth

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International Journal of Mining Science and Technology 2023年第11期33卷 1339-1350页

作者： Hongwei Zhou Mingyuan Lu Heping Xie Wenhao Jia Ruidong Peng Yimeng Wang Bocen Chen Pengfei Jing School of Energy and Mining Engineering China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan 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 School of Mechanics and Civil Engineering China University of Mining and Technology-BeijingBeijing 100083China

deep in-situ rock mechanics considers the influence of the in-situ environment on mechanical properties,differentiating it from traditional rock *** investigate the effect of in-situ stress,pore pressure preserved environment on the mechanical difference of sandstone,four tests are numerically modeled by COMSOL:conventional triaxial test,conventional pore pressure test,in-situ stress restoration and reconstruction test,and in-situ pore pressure-preserved test(not yet realized in the laboratory).The in-situ stress restoration parameter is introduced to characterize the recovery effect of in-situ stress on elastic modulus and heterogeneous distribution of sandstone at different depths.A random function and nonuniform pore pressure coefficient are employed to describe the non-uniform distribution of pore pressure in the in-situ *** results are compared with existing experimental data to validate the models and calibrate the numerical *** extracting mechanical parameters from numerical cores,the stress-strain curves of the four tests under different depths,in-situ stress and pore pressure are *** influence of non-uniform pore pressure coefficient and depth on the peak strength of sandstone is *** results show a strong linear relationship between the in-situ stress restoration parameter and depth,effectively characterizing the enhanced effect of stress restoration and reconstruction methods on the elastic modulus of conventional cores at different *** in-situ pore pressurepreserved test exhibits lower peak stress and peak strain compared to the other three tests,and sandstone subjected to non-uniform pore pressure is more prone to plastic damage and ***,the influence of non-uniform pore pressure on peak strength gradually diminished with increasing depth.

关键词： In-situ pore pressure-preserved environment Numerical simulation approach deep in-situ rock mechanics In-situ stress restoration and reconstruction

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Stability analysis of rib pillars in highwall mining under dynamic and static loads in open‑pit coal mine

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International Journal of Coal Science & Technology 2022年第3期9卷 120-135页

作者： Haoshuai Wu Yanlong Chen Haoyan Lv Qihang Xie Yuanguang Chen Jun Gu State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou 221116China

The retained coal in the end slope of an open-pit mine can be mined by the highwall mining ***,the instability mechanism of the reserved rib pillar under dynamic loads of mining haul trucks and static loads of the overlying strata is not clear,which restricts the safe and efcient application of highwall *** this study,the load-bearing model of the rib pillar in highwall mining was established,the cusp catastrophe theory and the safety coefcient of the rib pillar were considered,and the criterion equations of the rib pillar stability were *** on the limit equilibrium theory,the limit stress of the rib pillar was analyzed,and the calculation equations of plastic zone width of the rib pillar in highwall mining were *** on the Winkler foundation beam theory,the elastic foundation beam model composed of the rib pillar and roof under the highwall mining was established,and the calculation equations for the compression of the rib pillar under dynamic and static loads were *** results showed that with the increase of the rib pillar width,the total compression of the rib pillar under dynamic and static loads decreases nonlinearly,and the compression of the rib pillar caused by static loads of the overlying strata and trucks has a decisive *** simulation and theoretical calculation were also performed in this *** the numerical simulation,the coal seam with a buried depth of 122 m and a thickness of 3 m is mined by highwall mining *** to the established rib pillar instability model of the highwall mining system,it is found that when the mining opening width is 3 m,the reasonable width of the rib pillar is at least 1.3 m,and the safety factor of the rib pillar is *** numerical simulation results are in good agreement with the results of theoretical calculation,which verifes the feasibility of the theoretical analysis of the rib pillar *** research provides a reference for the st

关键词： Open-pit coal mine Dynamic and static loads Highwall mining Rib pillar Catastrophe instability

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Creation mechanism of electron-positron pair on equally spaced multiple localized fields

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Chinese Physics B 2023年第9期32卷 261-266页

作者：李传可林南省周鲜鲜江淼李英骏 State Key Laboratory for GeoMechanics and Deep Underground Engineering China University of Mining and TechnologyBeijing 100083China School of Science China University of Mining and TechnologyBeijing 100083China School of Management Science and Engineering Anhui University of Finance and EconomicsBengbu 233030China

We investigate the electron-positron creation process from multiple equally spaced distributed oscillating electric *** computational quantum field theory(CQFT)is applied to analyze the effect of the number of local fields,the distance between them,and their potential height on the created particle *** is found that whether adjacent electric fields overlap plays an important *** creation rate exhibits a direct linear relationship with the number of fields when they do not overlap,but exceeds the sum of the rate when the fields *** exhibit a distinctly nonlinear relationship when they overlap,and in particular exhibit a quadratic relationship when the fields completely *** phenomena corroborate that the particle pair creation in the interaction region is non-uniform and influenced by the strength of the central strongest electric field.

关键词： electron-positron pair creation ultra-strong laser field computational quantum field theory

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Real-Time Observation of Instantaneous ac Stark Shift of a Vacuum Using a Zeptosecond Laser Pulse

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Chinese Physics Letters 2024年第1期41卷 11-15页

作者：苏丹丹江淼 Key Laboratory for Laser Plasmas(Ministry of Education)and School of Physics and Astronomy Collaborative Innovation Center for IFSA(CICIFSA)Shanghai Jiao Tong UniversityShanghai 200240China School of Science China University of Mining and TechnologyBeijing 100083China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyBeijing 100083China

Based on the numerical solution of the time-dependent Dirac equation,we propose a method to observe in real time the ac Stark shift of a vacuum driven by an ultra-intense laser *** overlapping the ultra-intense pump pulse with another zeptosecond probe pulse whose photon energy is smaller than 2mc^(2),electron–positron pair creation can be controlled by tuning the time delay between the pump and probe *** the pair creation rate depends sensitively on the instantaneous vacuum potential,one can reconstruct the ac Stark shift of the vacuum potential according to the time-delay-dependent pair creation rate.

关键词： pump tuning vacuum

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