摘要
煤矿地下水库是实现水资源保护与利用的有效技术途径,其中煤柱坝体稳定性对保障地下水库系统安全具有重要影响。针对地下水库煤柱坝体处于动静载叠加的复杂应力环境,结合补连塔煤矿地下水库工程背景,采用FLAC3D程序构建复杂应力场下煤柱坝体动态损伤数值计算模型,研究多工作面开采侧向支承压力分布及动载荷作用下煤柱坝体动力响应规律,并采用声波探测巷道围岩松动圈范围。研究结果表明:受邻近工作面采动影响,煤柱处于较高的侧向支承压力影响区,塑性区发育范围较大;受矿震等动载荷影响,煤柱围岩塑性区发育面积及发育深度显著增加,竖向应力极值点向纵深方向发展;巷道围岩松动圈发育深度煤柱侧大于工作面侧,在重复采动残余支承压力和动载叠加作用下煤柱损伤破坏程度更严重。研究结果为地下水库建设与长期安全运行提供了科学依据。
Underground reservoir systems in coal mines represent an effective technical means of protecting and utilizing water resources, and the stability of coal pillar dams is the key factor in the safety and stability of these underground water storage systems. In response to the complex environments where coal pillar dams are in the dynamic-static superimposed stress fields, and combined with the engineering backgrounds of Bulianta Coal Mine, the software of FLAC3 D has been used to establish the dynamic failure numerical simulation model for coal pillar dams, and the mechanisms of mining-induced side abutment stress distribution and dynamic response triggered by dynamic loading have been uncovered. In addition, the fractured zone around the roadway has been analyzed through the acoustic detection. The study results have indicated that the coal pillar is located in the high side abutment stress zone with the influence of the adjacent longwall mining activity, and hence a larger plastic development zone;induced by the dynamic loadings, such as mine earthquake, the plastic development areas and depths of the coal pillars increase remarkably, with the maximum vertical stress points moving into the deeper zones;the development depth of the fractured zone is larger on the coal pillar’s side than on the longwall mining face’s side, and the combination of repeated mining-induced remnant abutment stress and dynamic loading leads to a worse failure in the coal pillar dams. The results provide a scientific basis for enhancing the construction and long-term safe operation of underground water reservoir systems.
作者
王方田
梁宁宁
李岗
赵宾
WANG Fangtian;LIANG Ningning;LI Gang;ZHAO Bin(School of Mines,China University of Mining&Technology,Xuzhou,Jiangsu 221116,China;State Key Laboratory of Groundwater Protection and Utilization by Coal Mining,China Energy Group,Beijing 100011,China;Dadi Engineering Development(Group)Co Ltd,Beijing 100011,China;Henan Pingbao Coal Industry Co Ltd.,Pingdingshan,Henan 461700,China;Department for Foreign Cooperation and Development,China University of Mining&Technology,Xuzhou,Jiangsu 221116,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2019年第6期1145-1152,共8页
Journal of Mining & Safety Engineering
基金
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(SHJT-16-30.13)
国家自然科学基金项目(51974297)
中国博士后科学基金项目(2018M630634)
学科前沿科学研究专项项目(2019XKQYMS50)
关键词
地下水库
煤柱坝体
动静载
损伤破坏
松动圈
underground water reservoir
coal pillar dams
dynamic-static superimposed stress
failure evolution
fractured zone
