巷道非对称底鼓的力学解析

Mechanical Analysis of Asymmetric Floor Heave of Roadway

探讨深部开采条件下非对称底鼓现象的影响因素和形成机制,为巷道底鼓的防治提供理论依据。根据郎肯土压力理论,建立了非对称底鼓的力学模型及分析计算简图,得到了4种非对称底鼓的破坏形式,导出了巷道底压的计算公式。通过给定部分参数,得到了极限破坏深度、底压、底压偏移角分别与松散岩体折算摩擦角和巷道宽度的关系。研究表明,岩性较差或者较为破碎的围岩以及宽度较大的巷道受非对称荷载比值的影响较大,且巷道底压会有一定的偏转。研究结果对于控制深井非对称底鼓有一定的参考作用。最后介绍了1个防治巷道底鼓的实例。

In the conditions of deep mining, the phenomenon of asymmetric floor heave is more and more com- mon, the safety and high efficiency production of coal mine is seriously restricted. Discussion on affecting factors and forming mechanism of the floor heave, it has important academic value and practical significance for the pre- vention of floor heave. According to Rankine earth pressure theory, mechanical model and analysis diagram of asymmetric floor heave is established. 4 kinds of destruction forms of asymmetric floor heave are got, the calcula- tion formula of bottom pressure of roadway is derived. C, iven some parameters, the relationship of critical failure depth,bottom pressure,offset angle of bottom pressure with translated friction angle of friable rock and width of roadway are obtained respectively, Research shows that the influence of ratio of asymmetric load for roadway is rery big when surrounding rock is broken up or lilbology is poor, and bottom pressure will have a eertain deflec- tion, which has certain reference in control of asymmelric floor heave. Finally, a example of roadway floor heave prevention are presented.