特厚煤层开采覆岩离层水形成及涌突风险  

Water Formation and Inrush Risk of Overburden Strata for Extra-thick Coal Seam Mining

作　　者：张培森[1,2] 闫奋前 孙亚楠 吴俊达[1,2] ZHANG Peisen;YAN Fenqian;SUN Yanan;WU Junda(State Key Laboratory of Mining Disaster Prevention and Control,Shandong University of Science and Technology,Qingdao 266590,China;Mining Engineering National Experimental Teaching Demonstration Center,Qingdao 266590,China)

机构地区：[1]山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地,山东青岛266590 [2]矿业工程国家级实验教学示范中心,山东青岛266590

出　　处：《煤矿安全》2020年第7期36-41,共6页Safety in Coal Mines

基　　金：国家重点研发计划资助项目(2018YFC0604702);国家自然科学基金资助项目(51509149,51379119,51774199);山东省重点研发计划资助项目(2018GSF120009)。

摘　　要：在分析招贤煤矿首采区水文地质资料的基础上,采用理论分析、相似材料试验和数值模拟等研究方法,理论预判特厚煤层开采过程中覆岩离层层位及积水离层,分析竖向及横向裂隙动态发育特征,探讨特厚煤层多工作面依次开采离层发育状况。研究表明:距3煤顶板253.64 m处的巨厚砾岩层底部存在可积水离层空间;工作面推进过程中竖向裂隙高度的增长呈现出线性增长和台阶式增长2个阶段,横向裂隙自下而上交替呈现动态发育与闭合,横向裂隙发育高度与工作面推进距离间呈正相关关系;1307工作面开采导致宜君组下方出现开度为0.02 m的横向离层裂隙,随1305、1303工作面依次开采该离层裂隙开度进一步扩大,甚至陡增。引入底板突水系数法对招贤煤矿离层水涌突风险进行评估。Based on the analysis of the hydrogeological data of the first mining area in Zhaoxian Coal Mine,by using the research methods of theoretical analysis,similar material test and numerical simulation,the separation layer of overburden strata and water in the mining process of extra-thick coal seam is predicted theoretically.The dynamic development characteristics of vertical and horizontal fractures are analyzed,and the development status of separation layer in the sequential mining of multiple working faces in extra-thick coal seam is discussed.The results show that there is a space for water to separate from the bed at 253.64 m away from the top of the No.3 coal seam;the vertical fracture height increases in two stages including linear growth and stepped growth in the process of the working face advance;the horizontal fracture alternately develops and closes from bottom to top,and the development height of the horizontal fracture is positively related to the advancing distance of the working face;the 0.02 m horizontal separation fissure appears under the Yijun formation caused by the mining of 1307 working face,and the opening of the separation fissure is further expanded or even increased sharply with the mining of 1305 and 1303 working faces in turn;the method of floor water inrush coefficient is introduced to evaluate the risk of separation water inrush in Zhaoxian Coal Mine.

关 键 词：特厚煤层 涌突风险 积水离层 离层层位 动态发育 

分 类 号：TD745.21[矿业工程—矿井通风与安全]