穿越断层破碎带隧洞注浆范围研究

The Research of Grouting Scope in Longjinxi Water Tunnel through Fault Fracture Zone

以福建龙津溪引水隧洞工程为背景,隧洞在穿越断层破碎带时,在设计注浆条件下,存在着严重掌子面渗水的施工地质灾害。鉴于此,利用FLAC3D、ANSYS等数值模拟软件进行了各注浆工况下的渗水机理分析,综合比选获得最佳的施工注浆参数和注浆范围。得出了如下结论:1注浆圈厚度越大,掌子面处最大渗流速度越小;当注浆圈厚度大于3 m时,渗流速度的减幅不明显;2注浆长度越大,掌子面处最大渗流速度越小;当注浆长度大于9 m时,渗流速度的减幅不明显;3隧洞在穿越断层时,掌子面处渗流速度明显增大,施工时应多加注意。研究结论表明:分段高压注浆增强了隧洞掌子面的稳定性,使隧洞的开挖过程更加安全。

In the background of Fujian Longjin river water diversion tunnel,engineering through the fault fracture zone,under the condition of the design of grouting,the construction of seepage water of constraints there are serious geological disasters. In view of this,using the FLAC3 D,ANSYS numerical simulation software the mechanism of grouting under the condition of water seepage was analyzed,the comprehensive comparison get the best construction grouting parameters and grouting range,the following conclusions were reached： ①slip ring thickness,the smaller the maximum flow velocity at the working face; when grouting ring thickness greater than 3 m,seepage rate reduction is not obvious; ② grouting length,the smaller the maximum flow velocity at the working face; when the grouting is longer than 9 m,seepage rate reduction is not obvious; ③ through the tunnel at the time of the fault,the working face of the flow rate increased significantly,the construction should pay more attention. These conclusions show： break pressure grouting to enhance the stability of the tunnel working face,so that more secure tunnel excavation process.