关键词: 岩石巷道, 锚杆支护, 预紧力, 支护效果, 理论分析

Abstract: In this paper, to theoretically demonstrate the action mechanism of bolt pretension on supporting effect of roadway, the ideal elasto-plastic strain-softening model is established to analyze the mechanical characteristics of bolt supporting in rock roadway. Thus, the analytical expressions of displacement, stress distribution in roadway surrounding rock after pre-stressed bolt supporting are obtained. The theoretical analysis results show that improving the bolt pretension can improve the stress states of surrounding rock around the roadway and control the roadway deformation effectively, which is beneficial to maintain the roadway stability. Moreover, the influence relation of bolting pretension on roadway supporting effect is further studied based on field measurements. The research results can provide theoretical basis for analyzing the bolting action mechanism and bolt supporting design.

Key words: rock roadway, bolts supporting, bolt pretension, supporting effect, theoretical analysis