煤矿地下水库平板型人工坝体抗震性能分析  

Seismic performance analysis of flat artificial dam of underground reservoir in coal mine

作　　者：池明波 李鹏 曹志国[1,2] 武洋 张勇 李海祥 吴宝杨 CHI Mingbo;LI Peng;CAO Zhiguo;WU Yang;ZHANG Yong;LI Haixiang;WU Baoyang(State Key Laboratory of Water Resources Protection and Utilization in Coal Mining,Beijing 100011,China;Beijing Institute of Low Carbon and Clean Energy,Beijing 100011,China;School of Mechanic and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100011,China;Guoneng Shendong Coal Technology Research Institute,Yulin 719000,China)

机构地区：[1]煤炭开采水资源保护与利用国家重点实验室,北京100011 [2]北京低碳清洁能源研究院,北京100011 [3]中国矿业大学(北京)力学与建筑工程学院,北京100011 [4]国能神东煤炭技术研究院,陕西榆林719000

出　　处：《煤炭学报》2023年第3期1179-1191,共13页Journal of China Coal Society

基　　金：国家自然科学基金青年基金资助项目(52004011);国家能源集团科技创新资助项目(GJNY-21-26,GJNY-18-79)。

摘　　要：煤矿地下水库有效地解决了西部矿区矿井水保护与利用问题,地下水库安全稳定是其执行“导储用”核心技术的关键,而人工坝体是连接水库坝体的纽带。为此,针对煤矿地下水库人工坝体安全稳定问题,选取典型的平板型人工坝体为研究对象,基于大柳塔2-2煤层煤矿地下水库基本情况,利用相似模拟实验、数值分析等研究方法,分析了不同地震(1~15 m/s^(2))作用下煤矿地下水库平板型人工坝体稳定性特征。相似模拟结果表明:煤矿地下水库平板型人工坝体可以抵抗10烈度以上(12 m/s^(2))地震作用,在由小到大地震循环加载作用下产生的最大位移为0.19 mm;人工坝体产生应力集中的位置主要在坝体底部,应力变化规律为底部>腹部>顶部,同一地震波作用下坝体反面应力峰值约大于正面10%,整个震动过程中人工坝体未出现裂隙发育情况,说明人工坝体始终保持弹性工作状态;顶部压力逐渐增加和循环地震作用过程中,人工坝体内应力急剧增加,坝体水平方向位移与非加压阶段相当,未表现出明显增加现象,但煤柱坝体在此过程中逐渐产生裂隙,最终裂隙贯通造成煤柱坝体垮落破坏。基于力学模型分析及模拟结果表明:大柳塔2-2煤矿地下水库坝体(煤柱+人工)在地震作用下未出现较大塑性变形,位移变化以垂直巷道方向最大,但变化范围均为毫米级,水库坝体在地震作用下保持较好的稳定性;由于人工坝体和煤柱坝体基础性质(强度、密度)不同,震动引起的加速度不同,造成人工坝体作用过程中加速度大于煤柱坝体(差值为1.14倍),导致坝体连接处剪切应力集中,是煤矿地下水库易发生破坏的关键位置。The coal mine underground reservoir effectively solves the problem of mine water protection and utilization in the western mining area.The safety and stability of the underground reservoir is the key to the implementation of the core technology of“guiding,storing and using”,and the artificial dam is the link connecting the reservoir dam.Therefore,aiming at the safety and stability of the artificial dam of coal mine underground reservoir,using the typical flat artificial dam as the research object,based on the basic situation of the Daliuta 2-2 coal mine underground reservoir,the stability characteristics of the flat artificial dam of coal mine underground reservoir under different earthquakes(1-15 m/s^(2))are analyzed in this study by using the research methods of similar simulation experiment and numerical analysis.The similar simulation results show that the flat artificial dam of coal mine underground reservoir can resist earthquakes above 10 degrees(12 m/s^(2)),and the maximum displacement under cyclic loading from small to large earthquakes is 0.19 mm.The stress concentration position of the artificial dam body is mainly at the bottom of the dam body,and the stress variation law is bottom>middle>top.Under the action of the same seismic wave,the peak stress on the reverse side of the dam body is about 10%greater than that on the front.There is no crack development in the artificial dam body during the whole vibration process,indicating that the artificial dam body always maintains an elastic working state.During the gradual increase of top pressure and cyclic earthquake,the internal stress of the artificial dam increases sharply,but the horizontal displacement of the dam is equivalent to that in the non-pressurization stage,and there is no obvious increase.However,the coal pillar dam gradually produces some cracks in this process,and finally the cracks are connected,resulting in the collapse and failure of the coal pillar dam.On the whole,the underground reservoir dam body(coal pillar+artificial)of the Da

关 键 词：煤矿地下水库 平板型人工坝体 震动作用 抗震性能 

分 类 号：TV623[水利工程—水利水电工程] TD74[矿业工程—矿井通风与安全]