深部大断面软岩巷道变形力学机制及耦合支护设计

Deformation Mechanical Mechanism and Coupling Support Design for Deep Large-Section-Soft-Rock Roadway

为解决煤矿深部大断面软岩巷道的支护难题,基于鹤煤九矿-420 m水平变电所地质条件的复杂性和工程重要性,采用现场地质调查、室内试验、理论分析、数值模拟和现场监测等方法,根据深部的概念体系和评价指标对其支护难度进行了评价,根据软岩工程力学理论确定了巷道围岩的类型和变形力学机制,提出了相应的控制对策和具体的支护设计形式、支护参数及合理的施工过程.结果表明:锚网喷+锚索+钢带+底角锚杆耦合支护形式可有效控制深部大断面软岩巷道的大变形,确保巷道的稳定和安全使用.

In order to solve the difficult problem of support design for deep large-section-soft-rock roadway,the engineering support difficulty is firstly evaluated according to the concept systems and evaluating index at great depth by means of the field geological investigation,laboratory test,theoretical analysis,numerical simulation,and field monitoring.The complexity of geological conditions and importance of the engineering of the substation at-420 m level in No.9 coal mine of hebi coal group is analyzed.Then the types of surrounding rock and deformation mechanical mechanism of substation are determined according to the theory of soft rock engineering mechanics.Finally,the corresponding control countermeasures,specific support design scheme,and appropriate construction process are put forward.The research results show that the coupling support design type of bolt-mesh-shotcreting-steel band-cable and base angle grouting bolt can effectively control the severe deformation of deep large-section-soft-rock roadway and ensure the stability and safety of the roadway.