岩溶区地铁盾构隧道下穿水源地综合勘探技术  

Comprehensive Exploration Technology for Metro Shield Tunnel Crossing Underneath Water Source in Karst Area

作　　者：蒋益平 陈洪胜 李露瑶 朱小辉 杨正刚 宋小庆 曹振东 JIANG Yiping;CHEN Hongsheng;LI Luyao;ZHU Xiaohui;YANG Zhenggang;SONG Xiaoqing;CAO Zhendong(Shanghai Urban Construction Design and Research Institute(Group)Co.,Ltd,Shanghai 200125,China;PowerChina Guiyang Engineering Co.,Ltd.,Guiyang 550081,Guizhou,China;Guiyang Public Transport Investment and Operation Group Co.,Ltd.,Guiyang 550081,Guizhou,China;Geo-engineering Investigation Institute of Guizhou province,Guiyang 550008,Guizhou,China)

机构地区：[1]上海市城市建设设计研究总院(集团)有限公司,上海200125 [2]中国电建集团贵阳勘测设计研究院有限公司,贵州贵阳550081 [3]贵阳市公共交通投资运营集团有限公司,贵州贵阳550081 [4]贵州地质工程勘察设计研究院有限公司,贵州贵阳550008

出　　处：《隧道建设（中英文）》2023年第9期1541-1548,共8页Tunnel Construction

基　　金：贵阳市轨道交通科研项目(GD3-FW-YJ-03-2019-11-ZB);黔科合支撑[2022]一般210。

摘　　要：为解决贵阳市轨道交通3号线一期工程农学院站—花溪公园站区间盾构法施工需下穿地质条件复杂的花溪河,而花溪河为水源保护区,不允许实施水上勘探孔的难题,通过研制生产低频电磁波跨孔CT的发射、接收探头,将常用的8~64 MHz工作频率降低至2~4 MHz,声波跨孔CT发射探头的电火花震源功率由2500 J提升到5000 J,实现最远距离54 m的跨孔CT测试,且达到电磁波跨孔CT和声波跨孔CT成果相互验证;结合勘探孔成果,确保综合勘探成果的可靠性。通过采用超远距离的电磁波跨孔CT和声波跨孔CT技术及勘探孔互相验证的综合勘探技术,成功解决花溪河水源地无法实施勘探孔的难题,查明盾构隧道下穿水源地的薄弱岩土层分布情况,并给设计和施工提供合理的建议,最终使盾构顺利地下穿花溪河。Phase 1 of Guiyang rail transit line 3 involves the construction of a shield tunnel that extends from the College of Agriculture Guizhou University station to the Huaxi Park station,passing beneath the Huaxi river with complex geological conditions.The above-water geological exploration cannot be implemented in this river because it is a water source protection area.In this study,a specialized geological exploration probe capable of launching and receiving low-frequency of the electromagnetic wave cross-hole CT scans is introduced to overcome this obstacle.This innovative probe reduces the operating frequency range from 8~64 MHz to 2~4 MHz while enhancing the power of the spark seismic source in the acoustic wave cross-hole CT launching probe from 2500 J to 5000 J.This adjustment enables the execution of cross-hole CT test at a maximum distance of 54 m and the mutual verification between the electromagnetic wave cross-hole CT and the acoustic wave cross-hole CT results.By adopting comprehensive exploration technology based on the use of ultra-long distanc electromagnetic wave cross-hole CT and acoustic wave cross-hole CT technology,as well as mutual verification of exploration holes,boreholes have been successfully implemented in Huaxi river water source areas.The distribution of weak rock and soil layers involved in the shield tunnel has been identified,providing reasonable suggestions for the design and construction.

关 键 词：岩溶 盾构隧道 电磁波跨孔CT 声波跨孔CT 超远距离跨孔CT 综合勘探 

分 类 号：U45[建筑科学—桥梁与隧道工程]