回坡底煤矿回采巷道非对称底鼓机理及防治措施  

Mechanism and prevention measures of asymmetric floor heave in mining roadway of Huipodi Coal Mine

作　　者：赵洪宝[1] 刘一洪 程辉[1] 李金雨 徐建峰 王伊阔 Zhao Hongbao;Liu Yihong;Cheng Hui;Li Jinyu;Xu Jianfeng;Wang Yikuo(School of Energy and Mining Engineering,China University of Mining&Technology-Beijing,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)能源与矿业学院,北京100083

出　　处：《矿业科学学报》2020年第6期638-647,共10页Journal of Mining Science and Technology

基　　金：越崎杰出学者资助项目(800015Z1179);国家自然科学基金(51474220);中央高校基本科研业务费专项资金(2009QZ03)。

摘　　要：以回坡底煤矿为工程背景,通过理论分析、数值模拟及现场实测研究了孤岛煤柱下回采巷道的非对称变形机理,提出了相应的底鼓防治措施。研究结果表明:孤岛煤柱下方岩体存在分区破坏特征且以剪切破坏为主,而采空区下方岩体以拉伸破坏为主,岩体破坏形态呈倒梯形;11-1021巷道位于剪切破坏和拉破坏岩体的交界处,导致巷道两侧围岩的破坏程度和破坏特征不同,从而巷道表现出非对称变形特征,1021巷道靠近煤柱侧围岩内应力较大,变形量较小,而靠近采空侧围岩的应力小,底鼓量大。基于巷道两侧围岩的应力和变形分布特征,提出了一种基于让抗结合的底鼓防治技术并进行现场验证,结果表明:当巷道不受采动影响时,经底鼓防治措施处理的区域底鼓量大幅减小,并且随时间增长底鼓速度趋于稳定;当巷道受采动影响时,经防治措施处理区域底鼓量减小近1/2,满足生产要求。Taking Huipodi coal mine as the engineering background,the asymmetric deformation mechanism of the mining roadway under the island coal pillar was studied by theoretical analysis,numerical simulation and field measurement,and the corresponding floor heave prevention and control measures were proposed.The results show that the rock mass below the island coal pillar has the characteristics of zoning failure and is mainly shear failure,while the rock mass below the mined area is mainly tensile failure,and the rock mass failure morphology is inverted trapezoid.Roadway 11-1021 is located at the junction of shear failure and tensile failure rock mass,which results in different degrees of damage and damage of the surrounding rock on both sides of the roadway,so the roadway exhibits asymmetric deformation characteristics,that is,the rock of roadway near the coal pillar side has a large internal stress and a small amount of deformation,while the stress near the goaf side rock is small and the floor heave is large.Based on the stress and deformation distribution characteristics of the surrounding rock on both sides of the roadway,a floor heave prevention and control technology based on the idea of anti-binding is put forward and verified on site.The results show that when the roadway is not affected by the mining,the floor heave volume of the area treated by the floor heave prevention measures is greatly reduced,and the drum speed tends to be stable with time;when the roadway is affected by the mining,the amount of floor heave in the treatment area of the control measures was reduced by nearly 1/2,meeting the production requirements.

关 键 词：孤岛煤柱 巷道 非对称底鼓 让抗结合 

分 类 号：TD3[矿业工程—矿井建设]