摘要
以高家梁煤矿30102辅运巷采掘地质条件为背景,运用理论分析、数值模拟和现场应用相结合的方法,研究了采空区遗留煤柱下伏煤巷,揭示了其变形破坏机理,并提出相应的控制技术。主要结论:受外部应力环境(上煤层采空区遗留煤柱非均匀传递)以及支护构件选择不合理等影响因素,30102辅运巷两帮非对称变形破坏,而顶板整体下沉明显;建立了近距离煤层下伏煤巷破坏结构模型,分析发现采空区遗留煤柱下伏煤巷非均布受载是导致顶板整体下沉及两帮非对称变形破坏的主要因素,且非均布受载越强,巷道围岩越易发生非对称变形破坏;数值模拟及现场巷道表面位移监测发现,采用非对称支护后巷道表面移近量明显比原支护条件下的表面移近量小,有效地控制住了巷道围岩的非对称变形。
Taking the geological conditions of 30102 transportation trough of Gaojialiang coal mine as an example,according to the theoretical calculation results,the numerical simulations and the actual situation of the site,studied on the underlying coal drift under residual coal pillar in the gob,revealed the deformation and failure mechanism,and put forward the corresponding control technology.The main conclusions are as follows:due to the influence factors of external stress environment(nonuniform transfer of coal pillar residual in gob of upper coal pillar)and unreasonable selection of support components,both sides of the 30102 transportation trough asymmetric deformations and destruction,and the roof sink is obvious;the failure structure model of the underlying coal drift under the close distance coal seam is established,the analysis shows that the uneven distribution load of the underlying coal drift under the residual coal pillar in the gob is the main factor leading to the roof subsidence and asymmetric deformation and failure of both sides,and the stronger the nonuniform load is,the more likely the surrounding rock of drift will be asymmetric deformation and failure;numerical simulation and field monitoring of drift surface displacement show that,after using asymmetric support,the displacement of drift surface is obviously smaller than that of original support,and it effectively control the asymmetric deformation of surrounding rock of roadway.
作者
杜磊
孙国庆
张立生
杨富强
王兆峰
王军
DU Lei;SUN Guoqing;ZHANG Lisheng;YANG Fuqiang;WANG Zhaofeng;WANG Jun(Gaojialiang Coal Mine,Ordos Haohua Clean Coal Co.,Ltd.,Ordos 017000,China;College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China)
出处
《煤炭技术》
CAS
北大核心
2023年第1期50-54,共5页
Coal Technology
关键词
遗留煤柱
煤巷
非对称变形
破坏机理
控制
residual coal pillar
coal roadway
asymmetric deformation
failure mechanism
control
