浅埋近距离煤层群重复采动覆岩破坏规律分析研究  

Analysis and Research on Overburden Failure Laws Under Repeated Mining in Shallow-buried and Close Coal Seam Group

作　　者：张杰[1,2] 何义峰 王旭 冯冲 杨涛[1] 康小杰 李宏儒 ZHANG Jie;HE Yifeng;WANG Xu;FENG Chong;YANG Tao;KANG Xiaojie;LI Hongru(School of Energy,Xi'an University of Science and Technology,Xi'an,Shaanxi 710054,China;Key Laboratory of Mine Mining and Disaster Prevention in West China,Ministry of Education,Xi'an University of Science and Technology,Xi'an,Shaanxi 710054,China;Shaanxi Yongxin Mining Co.,Ltd.,Yulin,Shaanxi 719000,China)

机构地区：[1]西安科技大学能源学院,陕西西安710054 [2]西安科技大学教育部西部矿井开采及灾害防治重点实验室,陕西西安710054 [3]陕西涌鑫矿业有限责任公司,陕西榆林市719000

出　　处：《矿业研究与开发》2022年第2期60-64,共5页Mining Research and Development

基　　金：国家自然科学基金项目(51774229;52004200);陕西省自然科学基础研究计划(陕煤联合基金)项目(2019JLM-41);国家自然科学青年基金项目(52004200).

摘　　要：以陕北韩家湾煤矿浅埋近距离煤层群开采为研究背景,通过物理相似模拟试验和现场实测,对浅埋近距离煤层群重复采动条件下覆岩破坏规律进行研究。结果表明:2^(-2)煤层周期来压步距平均为14.53 m,3^(-1)煤层周期来压步距平均为15.61 m,4^(-2)煤层周期来压步距平均为16.50 m;采用下行方式开采煤层,下煤层回采周期来压步距大于上煤层回采周期来压步距。2^(-2)煤层模拟跨落带高度为18 m,裂隙带最大高度为44 m(发育至载荷层下部),3^(-1)煤层模拟跨落带高度为11.5 m,裂隙带最大高度为80.5 m,4^(-2)煤层模拟跨落带高度为8 m,裂隙带最大高度为115.93 m,3^(-1)煤和4^(-2)煤的覆岩裂隙均与上煤层采空区贯通。实测表明,物理相似模拟试验所得数据与现场实测数据相符,验证了相似模拟试验用于类似问题研究的可行性。Based on the research background of shallow-buried and close coal seam group in Hanjiawan coal mine in NorthernShanxi Province,the overburden failure laws under repeated mining conditions of shallow-buried and close coal seam groupwere analyzed and studied through physical similarity simulation experiment and field measurement.The results show that theaverage periodic weighting step in the 2^(-2) coal seam,the 3^(-1) coal seam and the 4^(-2) coal seam is 14.53 m 15.61 m and 16.50 m.respectively.The coal seam is mined by the downward mining,and the periodic weighting step of the lower coal seam mining isgreater than that of the upper coal seam mining.The heights of simulated caving zone of the 2^(-2) coal seam,the 3^(-1)coal seamand the 4^(-2) coal seam are 18 m,11.5 m and 10 m,respectively,and the corresponding maximum heights of fracture zone ofabove coal seams are 44 m(developed to the lower part of load layer),80.5 m and 115.93 m respectively.The overburdenfractures of the 3^(-1) coal seam and the 4^(-2) coal seam are connected with the goaf in the upper coal seam.The actualmeasurement shows that the data obtained from the physical similarity simulation test is consistent with the field measureddata,which verifies the feasibility of the similarity simulation test on the study of similar problems.

关 键 词：浅埋近距离煤层群 重复采动 覆岩破坏 相似模拟 现场实测 

分 类 号：TD325[矿业工程—矿井建设]