切顶成巷条件下采空区覆岩破坏与裂隙发育特征  

Characteristics of overburden failure and fracture development in gob of mining with gob-side entry formed by cutting roof

作　　者：刘红威 赵阳升[3,4] REN Tingxiang 王飞 李治刚 LIU Hongwei;ZHAO Yangsheng;REN Tingxiang;WANG Fei;LI Zhigang(College of Safety and Emergency Management Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;School of Civil,Mining and Environmental Engineering,University of Wollongong,Wollongong,New South Wales 2500,Australia;College of Mining Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;Key Laboratory of In-situ Property Improving Mining of Ministry of Education,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China)

机构地区：[1]太原理工大学安全与应急管理工程学院,山西太原030024 [2]School of Civil,Mining and Environmental Engineering,University of Wollongong,New South Wales 2500,Australia [3]太原理工大学矿业工程学院,山西太原030024 [4]太原理工大学原位改性采矿教育部重点实验室,山西太原030024

出　　处：《中国矿业大学学报》2022年第1期77-89,共13页Journal of China University of Mining & Technology

基　　金：国家建设高水平大学公派研究生项目(201806930016);山西省重点研发计划(社会发展)项目(201803D31053);山西省重点研发计划(高新领域)项目(201903D121075);山西省焦煤集团公司重大技术攻关项目(201812xs06);山西省高等学校科技成果转化培育项目(JYT2019015)。

摘　　要：为明晰切顶成巷无煤柱开采条件下采空区覆岩破坏与裂隙发育特征,综合采用理论分析、数值模拟和现场实测相结合的方法对其进行研究.研究结果表明:切顶成巷条件下,直接顶和基本顶被切断后,基本顶断裂位置转移至采空区侧,侧向块体旋转下沉对留巷顶板的扰动减弱.基本顶初次来压和周期来压时的破断由原来的"O-X"形转化为近似"矩形"结构.基本顶的切断使得基本顶及其控制的上覆岩层得到充分垮落,采空区垮落带的高度明显增加.切顶后,垮落带上方离层裂隙的尺寸减少甚至消失,垮落带内覆岩导气裂隙增多,垮落带上方覆岩导气裂隙减少.In order to clarify the overburden failure and fracture development in gob under the condition of mining with gob-side entry formed by cutting roof,theoretical analysis,numerical simulation and field measurement were used to study them.The research results show that,under the condition of mining with gob-side entry formed by cutting roof,after the direct roof and basic roof are cut off,the fracture position of the basic roof is transferred to the side of the gob,which reduces the disturbance of the side block rotation and sinking on the roof of the gob-side entry.The breaking of the basic roof when initial pressure and periodic pressure appear is transformed from the original“O-X”type to the approximate“rectangular”structure.The cutting of the basic roof made the basic roof and the overburden under its control fully collapse,and the height of the caving zone in the gob increase obviously.After cutting the roof,the size of the separation fracture above the caving zone decrease or even disappear,the number of gas-guiding fractures in the caving zone increase,and the number of gas-guiding fractures in the overburden above the caving zone decrease.

关 键 词：切顶成巷 覆岩破坏 裂隙发育 导气裂隙带分布 

分 类 号：TD73[矿业工程—矿井通风与安全]