尾矿库加高与隧道开挖相互影响的数值模拟研究

Numerical simulation on interrelationship of tailings dam heightening and tunnel excavation

以某尾矿库加高与下穿隧道开挖为例,采用有限差分法进行数值模拟,分析了既有尾矿库现状下开挖隧道对尾矿库的影响,以及后期尾矿库加高对隧道的影响。分析结果表明:1)隧道开挖引起的岩体应力重分布范围约为隧道直径范围的3倍左右,不会波及到地表尾矿库,隧道掘进对现有尾矿库影响甚微;2)隧道周边岩体应力分布规律主要由隧道开挖过程形成,尾矿库堆高加载作用对其没有影响,只附加其应力值。隧道处于岩体应力拱保护范围内的低应力区域,周边岩体应力平衡,处于稳定状态;3)数值模拟方法用于研究尾矿库加高与隧道开挖相互影响是可行的,该方法可供类似项目借鉴。

This paper takes the tailings dam heightening and tunnel excavation as an example,applied with one of the numerical simulation method named finite difference method,analyzes the influence of the tailings during the tunnel excavation of the existing situation of tailing reservoir and the impact of tunnel excavation by tailings dam heightening in the later stage.The result shows that：1）The stress distribution of rock mass is about 3times of the diameter of the tunnel,which will not spread to the surface of the earth and has little impact to the tailings dam.2）Meanwhile,the stress distribution around the tunnel is mainly caused by the tunnel excavation process,so heightening the tailings reservoir has no effect on it and has effect on the stress value.The tunnel is in the low stress area of the rock mass stress,the surrounding rock mass stress is balanced and in a stable state.3）In a conclusion,the numerical simulation method is feasible when being applied in the research of interrelationship of tailings dam heightening and tunnel excavation.The method can be a reference for similar projects.