The Secondary Anchor-Cable Network Support Technology in Deep Soft-rock Roadway in Chaohua Coal Mine

Abstract

To solve support problems in deep soft-rock roadway in Chaohua Coal Mine, main causes of instability of the original U-shaped steel supported roadway in deep Chaohua Coal Mine were analyzed by combining numerical simulation, theoretical analysis and practical applications. The instability of the original support is the consequence that the passive support cannot adapt to deformation of surrounding rocks in deep high-stressed soft-rock roadway and failure of the original anchor-cable net support is mainly caused by unreasonable support parameters. In this paper, the high-strength and high-stability secondary anchor-cable net supporting technology against deformation of surrounding rocks in deep soft-rock roadway was proposed. Specifically, the primary high-strength anchor-cable net support reinforces the surrounding rocks in roadway on time and forms an effective bearing structure with surrounding rocks. The secondary cable supplement support increases stability and bearing capacity of the bearing structure. The test results of 31 Dilian Roadway demonstrated that the proposed secondary anchor-cable net support technology can solve the support problems in deep soft-rock roadway in Chaohua Coal Mine effectively.