关键词: 预紧力, 软弱围岩, 大断面, 深部高应力, 切眼

Abstract: According to the conditions of large section open - off cut, deep burial, soft surrounding rock, difficult support of Hong qinghe coal mine, put forward bolt support technology. Through the numerical simulation, the field test and the lithology analysis of the roadway surrounding rock, the support parameters of two open-cut are determined. The pretension of the bolt is not less than 40% of the yield load of the bolt, and 8m anchor is used to reinforce the support. Through the high preloading and strong support, control the early separation and deformation of the surrounding rock. The monitoring results show that the anchor net and cable support can effectively control the deformation of deep high stress, soft surrounding rock and large section open - off, and the supporting effect is good.