近距离煤层遗留煤柱下掘进巷道围岩控制技术研究

Research on surrounding rock control technology for mining roadway under residual coal pillars in close distance coal seams

针对南阳坡煤矿近距离煤层遗留煤柱下24202回风巷在掘进期间围岩控制难的问题,通过FLAC3D数值模拟软件,对其开挖后垂直应力分布、塑性区扩展形态进行了分析,顶板最大破坏深度3.5 m,两帮为1.5 m。根据数值模拟结果及工程实际情况,设计采用高强预应力长短锚杆(索)协同承载支护方案,在观测周期50 d内,24202回风巷两帮最大移近量控制在87 mm,顶底板最大移近量为92 mm,有效防止了巷道冒顶、片帮等灾害,为同类型地质条件下巷道围岩控制提供了思路。

In response to the difficulty in controlling the surrounding rock of No.24202 return air roadway under the residual coal pillar in the close distance coal seam of Nanyangpo Mine during excavation,the vertical stress distribution and plastic zone expansion morphology after excavation were analyzed using FLAC3D numerical simulation software.The maximum depth of roof failure was 3.5 meters,and the two sides were 1.5 meters.Based on numerical simulation results and actual engineering conditions,a high-strength prestressed long and short anchor rod(cable)collaborative bearing support scheme was designed.Within an observation period of 50 days,the maximum movement of the two sides of the 24202 tailgate was controlled at 87 mm,and the maximum movement of the top and bottom plates was 92 mm.This effectively prevented disasters such as roadway roof caving and fragmentation,providing a certain idea for controlling the surrounding rock of the roadway under the same type of geological conditions.