摘要
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 bearing phenomenon of 3414 working face in Xinyuan Coal Mine, based on the production geological conditions of 3414 working face, the bearing capacity mechanics model and UDEC Trigon numerical calculation model are established. The theoretical bearing coefficient of roadway unbalance is 2.93, which indicates that the bearing capacity of roadway coal body is larger than that of filling body; the rationality of micro-mechanics parameters of the rock strata in the model is validated. It is found that the fracture of surrounding rock is mainly shear fracture, the roof in mining area occurs tension and shear damage under the influence of strong vertical pressure of basic roof and the filling body; it shows that the area is a weak link in the control of the surrounding rock. The industrial experiment shows that the comprehensive control technology of the surrounding rock effectively controls the surrounding rock stability of the gob-side entry retaining.
出处
《煤矿安全》
北大核心
2017年第7期95-98,102,共5页
Safety in Coal Mines
基金
国家自然科学基金资助项目(51474209)
