双通道沿空留巷围岩偏应力分布及控制技术研究  

Study on deviatoric stress distribution and control technology of surrounding rock at gob-side entry retaining with dual-roadways

作　　者：王恩 陈冬冬[1] 谢生荣[1] 郭方方 武毅艺 杨洪增 WANG En;CHEN Dongdong;XIE Shengrong;GUO Fangfang;WU Yiyi;YANG Hongzeng(School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;Department of Civil Engineering,University of British Columbia,Vancouver V6T 1Z4,Canada;Hebei Coal Science Research Institute Corporation Ltd,Xingtai,Hebei 130500,China)

机构地区：[1]中国矿业大学(北京)能源与矿业学院,北京100083 [2]英属哥伦比亚大学土木工程系,加拿大温哥华V6T1Z4 [3]河北煤炭科学研究院有限公司,河北邢台130500

出　　处：《采矿与安全工程学报》2022年第3期557-566,共10页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(52074296,52004286);国家留学基金项目。

摘　　要：为解决高水材料巷旁充填沿空留巷围岩控制难题,以左则沟矿缓斜煤层1.8 m高水材料巷旁充填原位上巷沿空留巷为研究对象,提出可防止上侧采空区矸石挤压巷旁充填体的双通道沿空留巷技术。外侧通道采用单体支柱护网且裱褙半圆木形成一道矸石阻隔墙,可防止矸石窜入、为矸石挤压巷旁充填体提供缓冲空间及分担顶板载荷以减小上覆岩层对巷旁充填墙体的挤压力。通过理论分析、数值模拟和现场工程试验等方法研究双通道留巷围岩偏应力分布规律及其失稳破坏机制,明晰了留巷围岩偏应力峰值带主要呈“月牙状”分布于实体煤帮4.15 m及其顶板深处,得出留巷实体煤帮及其顶板、充填体底板不稳定泥岩为重点控制区域。基于此提出“一墙一挡三分区”控制思想,设计围岩分区域非对称组合控制技术,形成双通道留巷围岩“一穿过、四协同、五位一体”协同控制原理与方法。In order to solve the control problem of surrounding rock at gob-side entry retaining with high-water material, the in-situ gob-side entry retaining by filling with 1.8 m high-water material in gently inclined coal seam of Zuozegou mine was taken as the object, and a technology of gob-side entry retaining with dual-roadways was put forward, which can prevent the gangue in the upper goaf from squeezing roadside filling body. The outer roadway was protected by single pillar net and mounted with semi-round wood to form a gangue barrier wall, which can prevent gangue from channeling in, provide buffer space for gangue to squeeze roadside filling body and share the roof load, so as to reduce the extrusion pressure of overlying strata on roadside filling wall. Through theoretical analysis, numerical simulation, field engineering test and other coupling methods, the deviatoric stress distribution laws and failure mechanisms of gob-side entry retaining with dual-roadways are studied. It is clear that peak zone of deviatoric stress of the retained roadway was mainly “crescent” distributed at the depth of 4.15 m of solid coal and its roof. It was also concluded that the key control areas are solid coal and its roof and the unstable mudstone of the filling body bottom. Based on this, the control idea of “one wall, one block and three partitions” for surrounding rock of gob-side entry retaining with dual-roadways was proposed, and a sub-regional asymmetric combined control technology of gob-side entry retaining with dual-roadways was designed. The principle and method of “one-passing, four synergy, five-in-one” coordinated control of surrounding rock of gob-side entry retaining with dual-roadways was formed.

关 键 词：双通道沿空留巷 高水材料 分区非对称支护技术 偏应力 控制原理方法 

分 类 号：TD322[矿业工程—矿井建设]