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Cyclic shear behavior of en-echelon joints under constant normal stiffness conditions

Journal of Rock Mechanics and Geotechnical Engineering 2024年第9期16卷 3419-3436页

作者： Bin Wang yujing jiang Qiangyong Zhang Hongbin Chen Richeng Liu Yuanchao Zhang Graduate School of Engineering Nagasaki UniversityNagasaki852-8521Japan Research Center of Geotechnical and Structural Engineering Shandong UniversityJi’nan250061China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou221116China College of Civil Engineering Fuzhou UniversityFuzhou350108China

To reveal the mechanism of shear failure of en-echelon joints under cyclic loading,such as during earthquakes,we conducted a series of cyclic shear tests of en-echelon joints under constant normal stiffness(CNS)*** analyzed the evolution of shear stress,normal stress,stress path,dilatancy characteristics,and friction coefficient and revealed the failure mechanisms of en-echelon joints at different *** results show that the cyclic shear behavior of the en-echelon joints is closely related to the joint angle,with the shear strength at a positive angle exceeding that at a negative angle during shear *** the number of cycles increases,the shear strength decreases rapidly,and the difference between the varying angles gradually *** occurs in the early shear cycles(1 and 2),while contraction is the main feature in later cycles(310).The friction coefficient decreases with the number of cycles and exhibits a more significant sensitivity to joint angles than shear *** joint angle determines the asperities on the rupture surfaces and the block size,and thus determines the subsequent shear failure mode(block crushing and asperity degradation).At positive angles,block size is more greater and asperities on the rupture surface are smaller than at nonpositive ***,the cyclic shear behavior is controlled by block crushing at positive angles and asperity degradation at negative angles.

关键词： En-echelon joint Cyclic shear tests Shear stress Normal displacement Constant normal stiffness(CNS)

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Mechanical properties and acoustic emission characteristics of soft rock with different water contents under dynamic disturbance

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International Journal of Coal Science & Technology 2024年第3期11卷 135-148页

作者： yujing jiang Lugen Chen Dong Wang Hengjie Luan Guangchao Zhang Ling Dong Bin Liang State Key Laboratory of Mining Disaster Prevention and Control Co-Founded By Shandong Province and the Ministry of Science and Technology Shandong University of Science and TechnologyQingdao266590China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyBeijing100083China Inner Mongolia Shanghaimiao Mining Co. Ltd.Ordos016299China

Uniaxial compression tests and cyclic loading acoustic emission tests were conducted on 20%,40%,60%,80%,dry and saturated muddy sandstone by using a creep impact loading system to investigate the mechanical properties and acoustic emission characteristics of soft rocks with different water contents under dynamic *** mechanical properties and acoustic emission characteristics of muddy sandstones at different water contents were *** of experimental studies show that water is a key factor in the mechanical properties of rocks,softening them,increasing their porosity,reducing their brittleness and increasing their *** uniaxial compression,the macroscopic damage characteristics of the muddy sandstone change from mono-bevel shear damage and‘X’type conjugate bevel shear damage to a roadway bottom-drum type damage as the water content *** perturbation has a strengthening effect on the mechanical properties of samples with 60%and less water content,and a weakening effect on samples with 80%and more water content,but the weakening effect is not *** damage characteristics of dry samples remain unchanged,water samples from shear damage and tensile–shear composite damage gradually transformed into cleavage damage,until saturation transformation monoclinic shear *** evolution of acoustic emission energy and event number is mainly divided into four stages:loading stage(Ⅰ),dynamic loading stage(Ⅱ),yield failure stage(Ⅲ),and post-peak stage(Ⅳ),the acoustic emission characteristics of the stages were different for different water *** characteristic value of acoustic emission key point frequency gradually decreases,and the damage degree of the specimen increases,corresponding to low water content—high main frequency—low damage and high water content—low main frequency—high damage.

关键词： Dynamic disturbance Soft rock Cyclic loading Acoustic emission Water content

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A new deformable cable for rock support in high stress tunnel:Steel pipe shrinkable energy-absorbing cable

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International Journal of Mining Science and Technology 2024年第8期34卷 1083-1093页

作者： Xuezhen Wu Mingzhu Zhao Qing Ye yujing jiang Tao Deng Hanfang Zheng Gang Wang Zhenchang Guan College of Civil Engineering Fuzhou UniversityFuzhou 350108China School of Engineering Nagasaki UniversityNagasaki 852-8521Japan Key Laboratory of Underground Engineering Fujian University of TechnologyFuzhou 350118China

High stress in surrounding rock will lead to serious problems,e.g.,rock burst in hard rock and large deformation in soft *** applied support system under high in-situ stress conditions should be able to carry high load and also accommodate large deformation without experiencing severe *** this paper,a specially designed energy-absorbing component for rock bolt and cable that can solve the above problems was *** energy-absorbing component can provide support resistance by plastic deformation of the metal including constraint annulus and compression *** practical engineering,two forms were *** was installed in the surrounding rock by reaming,and the other was installed directly outside the surrounding *** the dilation of the surrounding rock,the relative displacement of constraint annulus and compression pipe occurs,resulting in deformation *** resistance is transmitted to the rock bolt or cable,providing support *** lab test and numerical simulation showed that the energy-absorbing component can perfectly achieve the large deformation effect,the deformation amount is as high as 694 mm,and the bearing capacity is stable at 367 *** field application tests were carried out in the mining roadway of Xinjulong coal mine,and the results showed that the new type of cable can ensure itself not to break under the condition of large deformation of the surrounding *** energy-absorbing component has the superiorities of performing large constant resistance and controllable deformation to effectively control the unpredictable disasters such as large deformation in soft rock and rock burst in hard rock encountered in deep strata.

关键词： Energy-absorbing cable Numerical simulation Lab test Load capacity Ultimate displacement

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Experimental study on failure mechanism of soft rock-coal bodies in abandoned mines under cyclic dynamic loading

Rock Mechanics Bulletin

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Rock Mechanics Bulletin 2024年第4期3卷 41-57页

作者： Dong Wang yujing jiang Bin Liang Zhijie Wen Jianlong Wang State Key Laboratory of Mining Disaster Prevention and Control Co–Founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and TechnologyQingdao266590China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology(Beijing)Beijing100083China Guizhou University Guiyang550525China

During the construction and operation of a pumped storage power station in an abandoned mine,the soft rockcoal body structure,comprising the roof and the residual coal pillars,encounters a complex stress environment characterized by cyclic *** study of its failure mechanism under cyclic dynamic loading holds significant theoretical and practical importance to stay the safety and stability of the abandoned mine pumped storage power *** this paper,we take“roof-residual coal pillar”soft rock-coal combinations with different percentages of rock as the research object,and study their mechanical properties,failure mechanism,energy evolution characteristics and acoustic emission distribution characteristics through cyclic dynamic loading *** results of the experiment indicate that:(1)Both weak cyclic dynamic loading and high rock percentage enhance the deformation resistance of soft rock-coal *** low-disturbance horizontal cyclic loading,its peak strength and modulus of elasticity increase with increasing rock percentage.(2)Under low-disturbance horizontal cyclic loading,an increasing trend is observed in the average total strain energy density,dissipation energy density,and elastic energy density of the combinations as the percentage of rock increases.(3)Under lowdisturbance horizontal cyclic loading,as the percentage of rock increases in the soft rock-coal combinations,the degree of failure in the rock body part progressively intensifies,while the destruction of the coal portion progressively decreases.(4)The large number of acoustic emission signals are generated at the instant of destabilization and destruction of the coal-rock combinations,mainly dominated by the signals generated by the destruction of the coal *** emission counts and absolute energy at key point N2 decrease as the percentage of rock *** b value is primarily distributed in the cyclic dynamic loading stage and the failure stage,both displaying

关键词： Soft rock-coal combinations Energy evolution Failure mechanism Cyclic dynamic loading Acoustic emission

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Effects of joint persistence and testing conditions on cyclic shear behavior of en-echelon joints under CNS conditions

Rock Mechanics Bulletin

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Rock Mechanics Bulletin 2024年第4期3卷 123-141页

作者： Bin Wang yujing jiang Qiangyong Zhang Hongbin Chen Research Center of Geotechnical and Structural Engineering Shandong UniversityJinan250061China Graduate School of Engineering Nagasaki UniversityNagasaki852-8521Japan

Cyclic shear tests on rock joints serve as a practical strategy for understanding the shear behavior of jointed rock masses under seismic *** explored the cyclic shear behavior of en-echelon and how joint persistence and test conditions(initial normal stress,normal stiffness,shear velocity,and cyclic distance)influence it through cyclic shear tests under CNS *** results revealed a through-going shear zone induced by cyclic loads,characterized by abrasive rupture surfaces and brecciated *** findings included that increased joint persistence enlarged and smoothened the shear zone,while increased initial normal stress and cyclic distance,and decreased normal stiffness and shear velocity,diminished and roughened the brecciated *** strength decreased across shear cycles,with the most significant reduction in the initial shear *** ten cycles,the shear strength damage factor D varied from 0.785 to *** strength degradation was particularly sensitive to normal stiffness and cyclic *** joint persistence,high initial normal stress,high normal stiffness,slow shear velocity,and large cyclic distance were the most destabilizing *** loads significantly compressed en-echelon joints,with compressibility highly dependent on normal stress and *** frictional coefficient initially declined and then increased under a rising cycle *** work provides crucial insights for understanding and predicting the mechanical response of en-echelon joints under seismic conditions.

关键词： Cyclic shear test Shear strength degradation Constant normal stiffness En-echelon joint Dilation characteristics

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图书馆数智化升级下用户融入的逻辑、困境及治理策略

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图书馆工作与研究 2024年第7期 5-12+38页

作者：姜玉晶山东大学(威海)图书馆

文章基于对新兴技术发展背景下图书馆数智化升级内涵的阐释，从用户、图书馆和价值3个层面分析图书馆数智化升级下用户融入的逻辑，指出“数智”的可获得性偏低、用户高层次需求难以满足、“使用鸿沟”与“能力鸿沟”并存导致用户不能... 详细信息

文章基于对新兴技术发展背景下图书馆数智化升级内涵的阐释，从用户、图书馆和价值3个层面分析图书馆数智化升级下用户融入的逻辑，指出“数智”的可获得性偏低、用户高层次需求难以满足、“使用鸿沟”与“能力鸿沟”并存导致用户不能融入、不想融入、不会融入的现实困境，并针对性提出图书馆数智化下用户融入的治理策略，即强化实效，增强“数智”可获得性，使用户能够融入图书馆；精准施策，提升用户融入积极性，使用户乐于融入图书馆；教育引导，协同共创，跨越“融入鸿沟”,使用户善于融入图书馆。

关键词：图书馆数智化数智化升级用户融入治理

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Theoretical framework for stress relief-support reinforcement cooperativecontrol of rock bursts in deep coal mining

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Geohazard Mechanics 2024年第1期2卷 49-57页

作者： Tongbin Zhao Weiyao Guo Dongxiao Zhang Yunliang Tan Yanchun Yin Yan Tan yujing jiang Jinpeng Yao College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao266590China State Key Laboratory of Mining Disaster Prevention and Control Cofounded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and TechnologyQingdao266590China Graduate School of Engineering Nagasaki UniversityNagasaki852-8521Japan

With the increasing depth of coal mining each year,rock burst has emerged as one of the most severe dynamic disasters in deep *** research status of rock burst prevention and control theory is *** on deep coal mining,the major issues encountered in researching the prevention theory of rock bursts are ***,the scientiﬁc connotation theory of stress relief-support reinforcement cooperative prevention and control of rock bursts in deep coal mines is ***,the mechanisms underlying the major research directions of the theory of stress relief-support reinforcement coordinated prevention and control and present a preliminarily theoretical framework for stress relief-support reinforcement coordinated prevention and control are *** tackle the key scientiﬁc problems in the coordinated prevention and control of rock bursts on relief and support in deep mine,the in-depth research based on the synergetic theory is *** involved exploring the principles of near-ﬁeld coal mass stress relief,near-ﬁeld roof andﬂoor stress relief,and anchor ***,the stress-energy evolution processes of the roadway near-ﬁeld surrounding rock structure under various stress relief and anchor support modes be ***,a mechanical model for the optimized matching of stress relief surrounding rock and anchor support is established,with the control of the rock burst energy source at its ***,the principle of collaborative prevention and control of deep mining rock burst stress relief and support from the perspectives of structural synergy,strength synergy,and stiffness synergy is *** insight is expected to provide theoretical support for the research and development of designs and techniques for deep mining rock burst prevention and control.

关键词： Deep mining Rock burst Stress relief Support Collaborative prevention and control

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高校图书馆文化育人研究现状与未来展望——基于2013—2023年度的文献统计分析

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图书馆杂志 2024年第9期43卷 63-70页

作者：师晓青姜玉晶程蓓山东大学(威海)图书馆山东威海264209

作为信息服务中心和文化传承重要基地的高校图书馆,文化育人是其重要职责和使命。本文通过对2013—2023年间高校图书馆文化育人研究文献的检索统计,采用百分比结构分析法全面梳理了高校图书馆学人相关研究的演变历程和最新进展,分析发... 详细信息

作为信息服务中心和文化传承重要基地的高校图书馆,文化育人是其重要职责和使命。本文通过对2013—2023年间高校图书馆文化育人研究文献的检索统计,采用百分比结构分析法全面梳理了高校图书馆学人相关研究的演变历程和最新进展,分析发现高校图书馆文化育人在根本任务、实现路径、夯实使命与筑牢根基方面形成共识。在此基础上,提出应重视新技术下的实践创新和理论探索、加强文化育人评价研究与促进多学科交叉研究的方向性建议。

关键词：高校图书馆文献统计与分析立德树人文化育人

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采动力学与岩层控制关键理论及工程应用

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煤炭学报 2024年第1期49卷 16-35页

作者：宋振骐文志杰蒋宇静蒋金泉石永奎山东科技大学能源与矿业工程学院山东青岛266590 贵州大学矿业学院贵州贵阳550025 长崎大学工学研究科日本长崎852-8521

研究岩体采动力学响应和岩层控制技术对促进煤炭安全高效开采、保障能源稳定供给具有重要意义,是实现煤炭资源科学开采的理论基础。矿山岩体灾害(围岩变形、冲击地压等)频发,其形成-演化-发生全过程与采动力演化分布、岩层运动、开采扰... 详细信息

研究岩体采动力学响应和岩层控制技术对促进煤炭安全高效开采、保障能源稳定供给具有重要意义,是实现煤炭资源科学开采的理论基础。矿山岩体灾害(围岩变形、冲击地压等)频发,其形成-演化-发生全过程与采动力演化分布、岩层运动、开采扰动和能量演化密切相关。基于实用矿山压力控制理论,提出并阐述了采场岩层控制进展与控制准则,建立了定量分析的力学模型和设计方法,发展了针对性的岩体灾害控制技术,并创新研制了配套试验研究装备。采动力学与岩层控制理论将岩层控制分为采场岩层控制和巷道围岩控制;提出控制或利用采动岩层运动改变致灾条件,给出“给定变形”和“限定变形”准则;调控“3S”因素准则(围岩应力环境、围岩结构属性、围岩支护结构)改变围岩自稳能力。以岩体灾害控制为目标,提出了以“应力主控”为核心的释能主控技术;建立了岩体灾害控制大小原理和弱面判据(安全系数K、冲击危险性系数U);研发了采场矿压机械模拟试验系统、采动力试验系统和蠕变及动力扰动冲击加载试验系统,实现了实验室尺度还原采动力作用下岩体变形-破裂-运动过程,为研究采动力作用下岩体力学响应提供了试验装备;分别从采场岩层控制、地质软岩巷道控制、工程软岩巷道控制及冲击地压控制4个方向进行了工程案例研究,相关研究成果在工程应用中得到了验证。

关键词：采动力学岩层控制岩体灾害 “3S”因素弱面判据试验系统研发

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关闭/废弃矿井抽水蓄能开发利用现状与进展

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煤炭学报 2024年第3期49卷 1358-1374页

作者：文志杰姜鹏飞宋振骐李利平蒋宇静梁桐凯山东科技大学能源与矿业工程学院山东青岛266590 贵州大学矿业学院贵州贵阳550025 山东大学齐鲁交通学院山东济南250002 中国华能集团有限公司山西分公司山西太原030002

探索清洁能源发展的创新途径是实现我国“双碳”目标的重要推动力。为解决大规模可再生能源电力供应不稳定的难题,新型电力系统的提出与加速成长促进了抽水蓄能电站的建设与发展,但生态保护与地形等因素制约了传统抽水蓄能电站发展。关... 详细信息

探索清洁能源发展的创新途径是实现我国“双碳”目标的重要推动力。为解决大规模可再生能源电力供应不稳定的难题,新型电力系统的提出与加速成长促进了抽水蓄能电站的建设与发展,但生态保护与地形等因素制约了传统抽水蓄能电站发展。关闭/废弃矿井,由于具有丰富的地下空间及水资源,可创新性地开发抽水蓄能并延长矿区的经济寿命,降低对环境与经济的负面影响。为助力建立适合我国国情的废弃矿井抽水蓄能利用模式和管理体系,通过文献分析法综述了国内外废弃矿井抽水蓄能技术研究与应用进展。详细阐述了关闭/废弃矿井抽水蓄能技术原理、分类及其优缺点;总结了关闭/废弃矿井抽水蓄能电站利用模式,并在前人研究基础上对选址要素进行了修订;梳理了关闭/废弃矿井改建抽水蓄能电站的水-气两相流动特性、水泵水轮机工况特性、地下空间围岩稳定性及地下蓄水空间体积测算等的研究现状,明确了水泵-水轮机关键技术、地下空间稳定性控制关键技术等亟待解决的技术难题。此外,对关闭/废弃矿井抽水蓄能相关的生态与环境保护、市场需求与经济效益、政策与法规等研究成果进行了广泛的文献综述。发展关闭/废弃矿井地下空间抽水蓄能技术可为我国井下空间资源利用提供思路,为保障国家能源安全与经济社会高质量发展提供新途径。

关键词：关闭/废弃矿井抽水蓄能清洁能源地下空间矿区治理

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