水平定向钻探技术在水利水电深埋隧道注浆堵水的应用

Application of horizontal directional drilling technology in grouting and water blocking of deep buried tunnels in water conservancy and hydropower

摘要

在地层复杂、裂隙发育的地层进行深埋隧洞掘进时，如何快速、有效解决渗漏、涌水等普遍存在的问题，已成为保障隧洞安全、有效掘进的重点。以某水利隧洞施工为工程背景，测量涌水量、涌水点等数据，结合长距离定向钻进技术，以洞轴线为圆心、半径为7.02 m的布孔圈上布置4个注浆孔，水平段与洞轴线平行布设、与隧洞轮廓线最小距离2.5 m,通过地面双向施工定向长钻孔进行超前预注浆，结果表明：透水率不大于3 Lu,隧道掘进治理段出水量不大于147 m³/h,治理效果明显。由此可以得出，与传统地面垂直孔帷幕注浆及掌子面循环注浆工艺相比，此注浆技术降低钻孔数量、提高注浆效率、控制注浆范围、节约注浆材料及施工工期，为隧洞安全掘进创造有利条件，对同类型的隧洞堵水治理具有一定的借鉴意义。

Abstract

When excavating deep buried tunnels in complex and fractured formations, how to quickly and effectively solve common problems such as leakage and water inrush has become the focus of ensuring tunnel safety and effective excavation. The construction of a certain water conservancy tunnel was taken as the engineering background, measures the water inflow, water inflow points and other data, combined with long-distance directional drilling technology. Four grouting holes are arranged on a hole layout circle with the tunnel axis as the center and a radius of 7.02 meters. The horizontal section is parallel to the tunnel axis and the minimum distance from the tunnel contour line is 2.5 meters. Advance pre grouting is carried out through bidirectional directional long drilling on the ground. The result show that the permeability rate is not more than 3 Lu, and the water output of the tunnel excavation treatment section is not more than 147 m³/h. The treatment effect is obvious. From this, it can be concluded that compared with traditional ground vertical hole curtain grouting and palm face cyclic grouting processes, this grouting technology reduces the number of boreholes, improves grouting efficiency, controls grouting range, saves grouting materials and construction period, creates favorable conditions for safe tunnel excavation, and has certain reference significance for similar tunnel water blocking treatment.

关键词

水利水电 / 隧道 / 定向钻 / 超长钻孔 / 注浆

Key words

water conservancy and hydropower / tunnel / directional drilling / ultra long drilling / grouting

Author summay

杨 越(1994—), 女, 工程师, 硕士, 主要从事定向钻探、注浆堵水研究。E-mail: [e-mail]