浸水煤体单轴压缩能量破坏机理及层理效应  

Energy Failure Mechanism and Bedding Effect of Soaked Coal Under Uniaxial Compression

作　　者：刘小玲 张泽天[1,2,3] 张茹 曹志国[4] 任利 孙紫琬 查尔晟 LIU Xiaoling;ZHANG Zetian;ZHANG Ru;CAO Zhiguo;REN Li;SUN Ziwan;ZHA Ersheng(College of Water Resources&Hydropower,Sichuan University,Chengdu 610065,China;State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu 610065,China;MOE Key Laboratory of Deep Underground Science and Engineering,Sichuan University,Chengdu 610065,China;State Key Laboratory of Water Resource Protection&Utilization in Coal Mining,National Institution of Low Carbon and Clean Energy,Beijing 102211,China)

机构地区：[1]四川大学水利水电学院,四川成都610065 [2]四川大学深地工程智能建造与健康运维全国重点实验室,四川成都610065 [3]四川大学深地科学与工程教育部重点实验室,四川成都610065 [4]北京低碳清洁能源研究院煤炭开采水资源保护与利用国家重点实验室,北京102211

出　　处：《工程科学与技术》2025年第1期189-200,共12页Advanced Engineering Sciences

基　　金：国家自然科学基金项目(52174084);煤炭开采水资源保护与利用国家重点实验室开放基金项目(WPUKFJJ2022-07);四川省自然科学基金项目(2022NSFSC0406)。

摘　　要：煤矿地下水库煤柱坝体存在显著的浸水渐进灾变力学响应,揭示浸水煤体单轴压缩能量演化特性的层理效应对煤柱坝体设计优化及安全控制具有重要意义。采用岩石多轴加载力学试验系统TEST 60,开展垂直及平行两种层理在不同浸水时间(0、2、4、16 d)下煤样的单轴压缩试验,获取浸水煤样单轴压缩全应力–应变曲线及物理力学参数,探究煤样单轴压缩加载全过程能量演化特征,分析不同层理浸水煤样单轴压缩能量演化机理。结果表明:1)长时间浸水后,垂直层理和平行层理煤样均发生了明显的水软化,抗压强度明显变小,且各能量指标均较未浸水时有明显降低;浸水16 d的平行层理、垂直层理煤样峰值应力处对应的总能量分别为未浸水时的56%、53%。2)浸水4 d内,平行层理煤样受水软化作用的影响不显著;垂直层理煤样的抗压强度先增加后降低,弹性能变化趋势与抗压强度保持一致,总能量、耗散能随着浸水时间的增加逐渐降低。3)相同浸水时间下,垂直层理煤样的强度及变形破坏过程中的各能量指标均高于平行层理煤样;未浸水垂直层理煤样的峰值总能量约为平行层理的2倍。4)由于不同层理方向煤样的吸水能力及其破坏面与层理面的关系有差异,导致在短时间浸水作用后不同层理煤样单轴压缩能量演化存在差异。研究结果丰富了已有对浸水煤体受载破坏过程能量演化规律的认识,为指导煤矿地下水库的安全建设与稳定运行提供参考和依据。Objective Underground reservoirs in coal mines,with a wide prospect of application,are significant for water resource protection in coal mining in China.The stability of coal pillar dam bodies that are soaked in water for long or intermittent periods is central to the safe construction and stable operation of underground reservoirs in coal mines.Coal with various bedding angles is encountered during coal mining.Given this,the progressive catastrophic mechanical response of coal pillar dams in underground reservoirs under soaking is studied,and the influence of the bedding effect on the energy evolution characteristics of water-soaked coal under uniaxial compression is revealed.Methods The coal from the Shenmu Daliuta coal mine is selected as the experimental object,and X-ray diffraction results indicate that it is primarily composed of quartz,pyrite,and kaolinite.The bedding structure of the coal is apparent,and samples in different bedding directions are obtained by drilling along two directions perpendicular and parallel to the bedding surface.The initial water content state of the test sample before immersion is natural.The coal samples are immersed in static water to simulate the soaking of the coal pillar dam body.Pure water is used for immersion in the experiment to avoid the interference of special element composition with the test results.The experiment is divided into four groups based on the duration of immersion(0,2,4,and 16 d).The group with 0 d immersion is used as a reference,and each group contains one vertical bedding sample and one parallel bedding sample.The experiment is conducted using TEST 60,a rock multiaxial loading mechanical testing system at Sichuan University.The uniaxial compression test is performed using an axial deformation loading rate of 0.008 mm/min.Results and Discussions The energy evolution characteristics during the process of coal sample damage and failure are as follows:the damage process is divided into four stages:the initial damage stage,the stable damage stage,the abrup

关 键 词：浸水时间 层理 煤样 单轴压缩 能量演化 

分 类 号：TU45[建筑科学—岩土工程]