急倾斜中厚煤层伪俯斜采场覆岩运移规律研究  

Strata movement law in pitching oblique stope of steeply inclined medium thick coal seam

作　　者：王德发 张颖异 解盘石[3,4] 黄宝发 屈利利 吴少港 林伟典 杨航 WANG De-fa;ZHANG Ying-yi;XIE Pan-shi;HUANG Bao-fa;QU Li-li;WU Shao-gang;LIN Wei-dian;YANC Hang(Inner Mongolia Coal Mine Design and Research Institute Co.,Ltd.,Hohhot O10010,China;Cathay Safety Technology Co.,Ltd.,Beijing 100012,China;Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education,Xi'an 710054,China;School of Energy and Resource,Xi'an University of Science and Technology,Xi'an 710054,China)

机构地区：[1]内蒙古煤矿设计研究院有限责任公司,内蒙古呼和浩特010010 [2]中安国泰(北京)科技发展有限公司,北京100012 [3]西安科技大学西部矿井开采及灾害防治教育部重点实验室,陕西西安710054 [4]西安科技大学能源学院,陕西西安710054

出　　处：《煤炭工程》2023年第1期76-80,共5页Coal Engineering

基　　金：国家自然科学基金面上项目(52174126);山东省重大科技创新工程项目(2019JZZY020326)。

摘　　要：急倾斜煤层由于在倾角-重力场效应的影响下,采场覆岩运移及应力分布均较水平煤层更加复杂,且采场围岩的稳定性控制难度较大。以逢春煤矿N2821工作面为工程背景,综合采用物理相似模拟实验、数值模拟和理论分析方法,研究了急倾斜中厚煤层顶板垮落充填、应力演化特征及覆岩运移规律。结果表明,急倾斜中厚煤层伪俯斜采场顶板破断呈明显的时序性特征,顶板呈非对称破断,且垮落轮廓呈空间梯阶状“残垣”形状。采场围岩应力在空间上形成非对称“壳体”,顶底板应力释放区域呈拱形,工作面两端出现应力集中,随着采场持续推进及垮落顶板的逐渐充填,倾斜下部顶板会再次出现应力集中,同时“壳体”下拱脚位置会随着充填体的增多而逐渐上移,但整体形状在不断演化后最终趋于稳定。Due to the influence of dip angle-gravity field effect, the strata movement and stress distribution in steeply inclined coal seam are more complex than those in horizontal coal seam, and it’s difficult to control the stability of surrounding rock. Therefore, taking the N2821 working face of Fengchun Coal Mine as the engineering background, the physical similarity simulation experiment, numerical simulation, and theoretical analysis method were used to study the roof caving filling, stress evolution characteristics and overburden rock migration law of steeply inclined medium thick coal seam. The results show that the roof breaking of pitching oblique mining area in steeply inclined medium-thick coal seam has obvious timing characteristics, the roof rock breaks asymmetrically, and the caved contour is spatial ladder “residual wall” shape. The stress of the surrounding rock of the stope forms an asymmetric “shell” in space. The stress release area of the roof and floor is arched, and the stress concentration occurs at both ends of the working face. With the continuous advancement of the stope and the gradual filling of the caved roof, the stress concentration will occur again in the inclined lower roof. At the same time, the position of the lower arch foot of the “shell” gradually moves up with the increase of the filling body, but the overall shape eventually stabilizes after continuous evolution.

关 键 词：急倾斜煤层 中厚煤层 伪俯斜采场 覆岩运移 

分 类 号：TD325[矿业工程—矿井建设]