煤系-红层覆岩结构采动效应及导水断裂带数值模拟  

Mining Effect of Coal Beds and Red Strata Overlying Rock Structure and Numerical Simulation of Water Flowing Fractured Zone

作　　者：何昭宇 乔伟[1] 任春辉[2] 谢君 赵连涛[4] HE Zhaoyu;QIAO Wei;REN Chunhui;XIE Jun;ZHAO Liantao(School of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221116,China;Huaibei Mining（Group）Limited Liability Company,Huaibei 235146,China;Xinhu Coal Mine,Huaibei Mining（Group）Limited Liability Company,Bozhou 236800,China;Yanzhou Coal Mining Company Limited,Zoucheng 272102,China)

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221116 [2]淮北矿业(集团)有限责任公司,安徽淮北235146 [3]淮北矿业(集团)有限责任公司信湖煤矿,安徽亳州236800 [4]兖州煤业股份有限公司,山东邹城272102

出　　处：《煤矿安全》2018年第7期175-180,共6页Safety in Coal Mines

基　　金：国家重点基础研究发展计划(973计划)资助项目(2015CB251601);国家自然科学基金资助项目(41302248);江苏高校优势学科建设工程资助项目

摘　　要：以安徽信湖煤矿8-2采区为工程背景,对煤系-红层覆岩天然工程地质特征进行了分析,重点研究了采动效应下覆岩离层发育位置和导水断裂带的演化规律。研究表明:覆岩存在巨厚红层与下伏地层不整合接触,形成煤系-红层双层结构,具备了覆岩离层的地质条件;利用关键层理论对离层位置进行初步判别,主要受控于第5、6、14、18、19层,且下第三系红层厚度较大为主关键层;利用FLAC^(3D)数值模拟试验,得知在工作面达到充分采动后,导水断裂带的最大高度为71 m,垮落带最大高度为14 m,裂高采厚比为17.75;信湖煤矿82煤层开采引发的覆岩结构采动变化显示,导水断裂带最大高度未达到关键含水层,但是要关注红层冲击倾向性问题,防止冲击作用下高位关键层破断,造成采场冲击及水害事故。Taking 8-2 mining area of Xinhu Coal Mine in Anhui Province as the engineering background, this paper analyzes the geological characteristics of the coal beds and red strata structure and focuses on the research of the development location of overlying strata under the mining effect and the evolution laws of water flowing fracture zone. The study shows that： the overlying strata formed a double layer structure of the coal beds and red strata, which has unconformable contact between the thick red strata and the lower strata, and has the geological condition for the separation of the overlying strata; the separation position is preliminarily judged by the key layer theory, which is mainly controlled by the 5, 6, 14, 18 and 19 layers, and the major key layer of the Eogene red strata with larger thickness; the FLAC^3D numerical simulation test was used, and it was found that after fully mining of the working face, the maximum height of water flowing fracuture zone is 71 m, the maximum height of caving zone is 14 m, the ratio of height to thickness of fractured zone is 17.75; the mining change of overlying strata caused by the 82 coal seam mining in Xinhu Coal Mine shows that the maximum height of the water flow fracure zone is not up to the key aquifer, but we should pay attention to the impact tendency problem of the red strata and prevent the high key stratum from breaking under the impact, resulting in stope impact and water damage accidents.

关 键 词：煤系-红层 关键层 采动效应 导水断裂带 数值模拟 

分 类 号：TD745.21[矿业工程—矿井通风与安全]