顶板不同区域巷道围岩变形规律及稳定性控制技术研究

Study on deformation law and stability control technology of surrounding rock in different areas of roof

以五阳煤矿75采区集中胶带大巷布置在回采工作面顶板覆岩内为工程背景,采用FLAC3D数值模拟对巷道布置在顶板覆岩内不同层位条件下的围岩变形特征、应力分布规律以及塑性区破坏特征等进行系统的分析。分析表明,随着与工作面的垂距越大,各层位岩体的水平应力及垂直应力均呈递减趋势,且当巷道布置在弯曲下沉带内的稳定性要高于布置在覆岩垮落带内和裂隙带内。同时针对五阳煤矿集中胶带大巷围岩软弱、破碎、支护困难的技术难题,提出了“锚杆+锚索联合支护”的围岩控制方案,工业性实验表明,在采用新支护方案后,顶底板最大移进量为200mm,两帮最大变形量为164 mm,该支护方案能够有效地控制集中胶带大巷的围岩变形,保证其服务年限内的稳定性。

The engineering background of the centralized belt roadway in the 75 mining area of Wuyang Coal Mine in the overburden of the mining face was taken as study background.The FLAC3D numerical simulation was used to simulate the deformation characteristics and stress distribution of the surrounding rock under different conditions in the overburden.The laws and the failure characteristics of the plastic area were systematically analyzed and studied.It was concluded that as the vertical distance from the working face increased,the horizontal and vertical stresses of the rock masses in each layer showed a decreasing trend,and when the roadway was arranged in the stability in the bending subsidence zone was higher than that in the overburden collapse zone and the fracture zone.At the same time,aiming at the technical problems of weak,broken and difficult support of the surrounding rock in the centralized belt road of Wuyang Mine,a"bolt+anchor cable combined support"surrounding rock control scheme was proposed.After the plan,the maximum moving amount of the top and floor was 200 mm,and the maximum deformation of the two sides was 164 mm.This support scheme can effectively control the deformation of the surrounding rocks of the centralized belt roadway and ensure the stability during its service life.