巷道掘进横穿小断层构造带顶板支护优化研究

Optimization study on roof support of roadway excavation crossing small fault structural belt

本文以曹家滩煤矿20322工作面掘巷工序为工程研究背景,通过现场调研监测了巷道横穿小断层地质构造带时发生冒顶来压事故前后的顶板变形破坏规律,并在此基础上通过数值仿真的方法研究了顶板强度值和刚度值对于顶板垮冒的影响特征。通过采取3根锚索和钢筋组合圈梁支护系统来对顶板进行控制,并对顶板内两侧锚索角度进行调整,通过桁架连接器构成锚索桁架系统来提升顶板内煤岩体的强度值和刚度值。结合现场实际地质条件,通过理论计算确定了顶板优化后的支护方案,现场应用后巷道掘进过小断层构造带期间顶板整体性较好且下沉变形控制效果显著。该技术为后续工作面安全高效回采奠定了基础。

The excavation process of No.20322 Face in Caojiatan Mine was taken as the engineering research background.Through on-site research and monitoring,the deformation and failure laws of the roof before and after the roof collapse and pressure accident occurred when the roadway crosses the small fault geological structure zone were monitored.Based on this,the influence characteristics of the roof strength and stiffness values on the roof collapse were studied through numerical simulation.Subsequently,the roof was controlled by adopting a support system consisting of three anchor cables and a steel bar composite ring beam,and the angles of the anchor cables on both sides of the roof were adjusted.The anchor cable truss system was formed through truss connectors to enhance the strength and stiffness values of the coal and rock masses inside the roof.Based on the actual geological conditions on site and theoretical calculations,the optimized support plan for the roof was determined.After on-site application,the overall integrity of the roof was good and the subsidence deformation control effect was significant during the roadway excavation through small fault structural zones.This laid the foundation for the safe and efficient mining of subsequent working faces.