掘进巷道应力区围岩变形机理及控制技术

Deformation Mechanism and Control Technology of Surrounding Rock in Stress Zone of Tunneling Roadway

针对2305巷450~530 m段过F7断层应力区时,顶板出现下沉、破碎、支护失效,应力区侧巷帮出现片帮、移近量大等围岩变形现象,分析得出2305巷围岩变形主要由构造应力、围岩特性、支护强度以及支护设计等原因所致,根据实际生产情况,对顶板采取“注浆+JW型锚索吊棚+π型钢棚”联合治理措施,对断层侧巷帮采用“超前管棚注浆+桁架锚杆”联合支护技术,通过实际应用效果来看,巷道应力区采取综合治理技术后,顶板下沉量控制在0.17 m以下,巷帮片帮深度控制在0.40 m以下,提高了应力区巷道成型率,保证了巷道安全快速掘进。

When the 450~530 m section of 2305 Lane passes through the F7 fault stress area,the roof sinks,breaks,and the support fails,and the surrounding rock deformation phenomena such as side slope of the stress area and large displacement occur.The analysis shows that the surrounding rock deformation of 2305 lane is mainly caused by structural stress,surrounding rock characteristics,support strength,support design and other reasons.According to the actual production situation,the joint treatment measures of"grouting+jw anchor cable hanging shed+πsteel shed"are taken for the roof,The combined support technology of"advance pipe shed grouting+Truss Bolt"is adopted for the roadway side of the fault.According to the actual application effect,after the comprehensive treatment technology is adopted in the roadway stress area,the roof subsidence is controlled below 0.17 m,and the depth of the roadway side slope is controlled below 0.40 m,which improves the roadway forming rate in the stress area and ensures the safe and rapid tunneling of the roadway.