关键词: 深部巷道, 锚杆支护, 采动应力, 强度和结构, 喷层时机

Abstract: In order to solve deep mining influence area roadway surrounding rock control problem in the Shuguang coal mine, taking west concentrated return alley as engineering background, the pull-out test of bolt was carried out underground, it was found that the anchoring force of the bolt was obviously lower, the field test showed that the influence of mining aggravated the deterioration of surrounding rock structure, and decreased the strength of coal and rock mass obviously, the strength of coal seam and mudstone decreasing by 31% and 19% respectively, the mining stress caused the strength of the surrounding rock to decrease, aggravated the deterioration of its structure, leaded to the loss of bolt anchoring force, weakened the effectiveness of bolt support to control the surrounding rock, and was the internal factor of the strong deformation and destruction of the roadway, the field investigation found that the bolt material had low strength, small prestress and bad compatibility of support components, which weakened the control function of bolt support system for surrounding rock, and was the external cause of instability and failure of roadway. Numerical simulation was used to study the effect of shotcrete timing on the stress and displacement of bolt tail, and the mode of thin shotcrete followed by thick shotcrete was determined. Based on the broken and loose characteristics of the surrounding rock of the return air roadway in the mining-affected area, the advanced grouting combined with high-prestress bolting and shotcreting technology was put forward, and the grouting and bolting and shotcreting reinforcement schemes and parameters were given, it provided reference for stability control of roadway surrounding rock under similar geological conditions.