复杂环境下巷道底鼓影响因素及控制技术

Influence Factors and Control Technology of Roadway Bottom Drum in Complex Environment

针对复杂环境下巷道发生严重底鼓的问题,理论研究了巷道底鼓围岩稳定性及位移计算方法,模拟研究了不同巷道宽度、巷道高度及侧压系数条件下巷道底鼓量变化趋势,结果表明:两帮岩石的挤压力作用是发生底鼓的重要原因,底鼓量与巷道宽度及两帮移近量有关。侧压系数对巷道底鼓影响最大,巷道宽度次之,巷道高度对底鼓影响最小,在λ为0.5~1.2的范围内,底板主要表现为挤压流动性底鼓。采用超挖锚固回填+底角锚杆的底板控制技术,实现了对复杂环境下底板的有效控制。

Research on the problem of severe floor heave in complex environment,the stability and displacement calculation and method of the surrounding rock of the floor heave are studied theoretically. The variation trend of the bottom drum volume under different roadway width,roadway height and side pressure coefficient is simulated. It shows that the squeezing force of the two groups of rock is an important reason for the occurrence of the floor heave. It is related to the width of the roadway and the deformation amount between the two gangs. The side pressure coefficient has the greatest influence on the floor heave,the width of the roadway is the second. The height of the roadway has the least influence on the floor heave. In the range of 0. 5 ~ 1. 2 of,the floor heave is mainly performed as squeeze fluidity. Effective control of the roadway floor is achieved under complex environment by using the ultra-excavation anchorage backfill ＋ bottom angle anchor bar control technology.