灰岩岩溶含水层开拓巷道预注浆效果模拟分析

Simulation Analysis on Pre-grouting Effect of Tunnel Excavating in Limestone Karst Aquifer

针对某矿山灰岩岩溶含水层开拓工程突水问题,采用Phase2软件建立拟开拓区流固耦合模型,利用有限元模拟分析注浆前后巷道开挖过程中的围岩变形、孔隙水渗流速度和巷道涌水量.结果表明:通过预注浆治理,有效充填封堵了灰岩岩溶含水层的过水通道,提高了围岩的物理力学指标和完整性,增强了围岩的抗变形能力和抗渗性能,可有效避免巷道掘进中的突水事故发生.

Aiming at the water inrush problem of limestone karst aquifer excavating in a mine,the fluid structure coupling model of the proposed excavation area is established by using Phase2 software,and the deformation of surrounding rock,the seepage velocity of pore water and the water inflow of the roadway during the excavation process before and after grouting are analyzed by using finite element simulation.Results show that the water passage of limestone karst aquifer is effectively filled and sealed by pre grouting treatment,and the physical and mechanical indexes and integrity of surrounding rock are improved,so as to improve the quality of the surrounding rock.The ability of resisting deformation and impermeability of surrounding rock greatly reduces water inflow,which can effectively avoid water inrush accidents in tunnel excavation.