考虑流固耦合的露天坑积水下边坡与巷道协同稳定性研究

Study on the synergy stability of slope and roadway under water accumulation in open-pit considering fluid structure coupling

露天矿边坡与巷道协同稳定性是影响矿山安全开采的关键因素。开展矿区边坡与巷道协同稳定性研究是保证矿山能进行安全施工的重要工作之一。针对矿区Ⅵ号矿组露天坑目前存汇水问题,分析论证后续井巷开采、工程力学、汇水等因素对Ⅳ号矿组、Ⅶ号矿组深部井巷工程是否有影响;采用3Dmine建立了露天矿三维地质模型,截取风险边坡剖面并建立数值模型,结合COMSOL Multiphysics多场耦合分析软件,对建立的剖面模型的渗流场与应力场进行耦合,通过精细化划分网格对其进行稳态求解,得到剖面模型的损伤区、应力场及位移变化云图,其中,边坡5号剖面区域基坑存在积水问题,在求解过程中考虑渗水条件。分析结果表明:Ⅵ号露天边坡、Ⅶ号露天边坡岩体损伤对地下工程均未造成影响,Ⅵ号矿坑积水的渗透速度分布在10^(-7)~10^(-6)m/s,由于渗透速度较低,Ⅵ号矿坑汇水并未对附近地采工程稳定性造成显著影响;建议对Ⅵ号矿坑汇水进行及时抽排,并加强Ⅶ号露天边坡位移监测。该研究结果为论证边坡与巷道协同稳定提供了新思路和参考。

The synergy stability of open-pit mine slopes and roadways is a crucial factor affecting safe mining.Conducting research on the synergy stability of mining slopes and roadways is one of the vital tasks to ensure safe construction in mines.Analyzing and demonstrating whether factors such as subsequent mining,engineering mechanics,and water collection impact the deep mining engineering of theⅣandⅦmining groups,in response to the current issue of water accumulation in the open-pit of theⅥmining group in the mining area.A three-dimensional geological model of the open-pit mine is established by 3Dmine,and a risk slope profile is cut and a numerical model is established.Combined with COMSOL Multiphysics multi-field coupling analysis software,the seepage field and stress field of the established profile model are coupled,and the steady-state solution is obtained by finely dividing the grid.The damage area,stress field,and displacement change cloud map of the profile model are obtained.Among them,there is a water accumulation problem in the foundation pit of slope No.5 profile area,and the seepage condition is considered in the solution process.The analysis results show that the damage to the rock mass of theⅥandⅦopen-pit slopes has no impact on the underground engineering.The infiltration speed of the water accumulation in theⅥmine pit is distributed between 10^(-7)m/s and 10^(-6)m/s.Due to the low infiltration speed,the water collection in theⅥmine pit has not significantly affected the stability of the nearby mining engineering.It is recommended to timely drain the water from theⅥmine pit and strengthen the displacement monitoring of theⅦopen-pit slope.The research results provide new ideas and references for demonstrating the synergy stability of slopes and roadways.