Full Anchor Cable Support Mechanism and Application of Roadway with Thick Soft Rock Mass Immediate Roof

Abstract

The focus of this paper is the thick soft rock mass roof of the track roadway in the No. 3606 panel of the Chaili Coal Mine. Due to its substantial thickness, the soft rock mass roof of the roadway is susceptible to damage and deformation during the mining process. In order to preserve the integrity of the roadway roof, a full anchor cable support scheme is proposed after studying the mechanism of bolt-anchor cable support. The supporting parameters and feasibility of the scheme were determined through support experience and numerical simulation analyses in the field. Moreover, on-site monitoring and data analysis were conducted, revealing that the anchor cables and anchor bolts played a stable role in supporting the roadway. The displacement of the roadway’s roof and floor was minimal, as was the displacement of the two ribs. The overall deformation of the roadway was minor. Practice demonstrated that the full anchor cable support method was effective in supporting the immediate roof of thick soft rock.

Failure Mechanism and Structural Safety Assessment of the Primary Support Structure of Soft Rock Tunnel: A Case Study

“…The numerical calculation model derived from field tests can overcome the research difficulties of single field test conditions and the difficulty in obtaining refined structural data [5,[19][20][21]. However, in the past, when establishing support structure models for large deformation tunnels in soft rock, sprayed concrete and steel rib structures with significant differences in stiffness and physical and mechanical properties in the primary support structure were often equivalent to uniform structures, which makes the mechanical response of the support structure in the numerical model significantly different from the field situation, and it is also impossible to compare and analyze the mechanical response and damage mechanism of sprayed concrete and steel rib structures under different primary support combinations, and cannot provide precise guidance for engineering practice [22]. Therefore, it is necessary to establish a refined numerical calculation model based on field tests to truly reproduce the combination method of field support structures and to timely supplement and provide positive feedback on the evaluation results of field experimental data, to comprehensively analyze the structural mechanical response and failure mechanism in soft rock tunnels.…”