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针对新元煤矿3414工作面沿空巷道不均衡承载现象,结合3414工作面生产地质条件,建立巷道承载力学模型和UDEC Trigon数值计算模型,理论计算得到巷道不均衡承载系数k_σ为2.93,表明巷道实体煤帮承受荷载大于充填体帮,巷道围岩裂隙以剪切裂隙为主,充填区域顶板在基本顶和充填体强大的垂直挤压力作用下,发生张拉裂破坏和剪切破坏,并沿充填体内侧断裂,表明该区域为沿空留巷围岩控制的薄弱环节。工业试验表明,采用及时支护充填区域顶板的围岩综合控制技术,可有效控制沿空留巷围岩稳定。
According to the unbalanced load carrying of roadway in 3414 working face of Xinyuan Coal Mine, combining with the production geological conditions of 3414 working face, the mechanics model of roadway and the numerical calculation model of UDEC Trigon are established. The unbalanced load coefficient k_σ of the roadway is 2.93, The load of coal gang is larger than that of backfill, and the fracture of surrounding rock of the roadway is dominated by shear fractures. Under the strong vertical compressive pressure of the top and the backfill, The fracture of the inside of the filling body indicates that the area is the weak link in the control of the gob-side entry retaining gob. Industrial tests show that the comprehensive surrounding rock control technology for supporting roof of filling area in time can effectively control the stability of surrounding rock of gob-side entry retaining.