基于流固耦合分析的富水隧道外水压力与限量排放标准研究

External water pressures and limited emission standards of water-rich tunnels based on fluid-solid coupling analysis

隧道衬砌结构外水压力和限量排放标准是岩溶山区隧道工程建设关注的焦点。以某富水隧道为依托,借助FLAC3D软件通过流固耦合数值分析,对富水隧道衬砌结构合理的外水压力取值和限量排放标准进行研究。分析了围岩无注浆条件下隧道外水压力随排水量的变化规律,进而提出了基于结构安全的隧道外水压力取值和地下水排放标准,同时分析了围岩注浆条件下隧道外水压力随注浆圈厚度和地下水排放量的变化规律,提出不同注浆厚度条件下地下水排放标准和合理的注浆圈厚度取值。

The external water pressures of tunnel lining structures and the limited discharge standards are the focus of tunnel construction in karst mountainous areas.Based on a water-rich tunnel,by using the FLAC3D software,the reasonable values of the external water pressures for the lining structures of the tunnel and the limited discharge standards are studied through the numerical analysis of fluid-solid coupling.The variation laws of water pressures of the tunnel with displacement without grouting is analyzed,then the values of the external water pressures of the tunnel and the standards of groundwater discharge based on the structural safety are proposed.At the same time,the variation laws of the external water pressures of the tunnel with grouting ring thickness and groundwater discharge under grouting are analyzed,the standards of groundwater discharge and the reasonable values of grouting ring thickness under different grouting thicknesses are put forward.