关键词: 软岩巷道, 联合支护, 松动圈, 关键部位支护, 反底拱, 数值模拟

Abstract: Due to the low bearing capacity of surrounding rock in coal mining roadway in western China, it is difficult to control the deformation of surrounding rock effectively by general bolting and spraying support. The common roadway sinking, bottom drum and film state phenomenon, the roadway repair rate remains high. The reason for the analysis is mainly the bolt isolation effect caused by the failure of the bolt to pass through the loose ring of the roadway and the stress concentration of the surrounding rock near the anchor. For this reason, based on the loose rock circle theory of the surrounding rock, the thickness of the loose ring of the roadway is calculated. According to the calculation of the bolt length; based on the key part support principle, the length, position and row spacing of the anchor cable are determined; the length and spacing of the counter-arch anchor are determined according to the slip line theory and plastic limit analysis method of the roadway floor. . In the construction of 113082 track mining roadway in No.1 Coal Mine of New Shanghai, the steel strip, anchor cable joint support and anti-bottom arch support scheme were designed. Numerical simulation shows that the scheme effectively improves the surrounding rock stress state and better control. The surrounding rock deformation of the roadway; after the implementation of the site, the continuous deformation of the roadway was controlled to ensure the safe production of the coal mine.