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根据沿空留巷围岩变形大且围岩力学参数具有随机性,应用工程可靠性理论,建立沿空留巷的巷帮、顶板和充填体的可靠度计算模型,得到支护结构可靠度计算公式。采用验算点法,分别计算淮南望峰岗矿512(5)工作面沿空留巷巷道煤帮、顶板与充填体的可靠度,并与目标可靠度相比,找出巷道支护薄弱环节,相应提出了增加巷道可靠度的措施。
According to the large deformation of gob-side entry retaining roadway and the mechanical parameters of surrounding rock are random, the reliability calculation model of gob-side entry retaining roof and backfill is established by applying engineering reliability theory. The reliability calculation of retaining structure is obtained formula. Using the check point method, the reliability of coal gangway, roof and backfill for gob-side entry retaining roadway in 512 (5) working face of Wangfenggang Mine in Huainan was calculated, and compared with the target reliability, the weak link in the roadway support was found, Correspondingly put forward measures to increase the reliability of roadway.