(CS)AMT法在深埋长隧洞勘察中的应用效果评价  

Evaluation of the Application of the(CS)AMT Method in Deep-Buried Long Tunnel Investigation

作　　者：李刚 李建超 LI Gang;LI Jianchao(Xinjiang Shuifa Construction Group Co.,LTD,Urumqi,Xinjiang Uygur Autonomous Region 830000;China Water Resources Beifang Investigation,Design and Research Co.Ltd.,Tianjin 300222)

机构地区：[1]新疆水发建设集团有限公司,新疆乌鲁木齐830000 [2]中水北方勘测设计研究有限责任公司,天津300222

出　　处：《水利水电工程设计》2025年第2期54-57,共4页Design of Water Resources & Hydroelectric Engineering

基　　金：国家重点研发计划项目:大埋深隧洞岩体工程特性测试技术与综合评价方法(2016YFC0401801)。

摘　　要：新疆一项跨流域调水工程全长40余千米,最大埋深超过2200 m,属深埋长隧洞。工作区内山区最高海拔超过4500 m,高差大,切割严重,自然条件险恶,勘察工作条件恶劣,不利于钻探、洞探等勘探手段开展。(可控源)音频大地电磁法(以下称(CS)AMT法)具有探测深度大、受地形影响较小、对低阻分辨率高、适用性较强等优点,在工程、资源等勘察领域得到了广泛的应用。本工程隧洞Ⅳ标段主洞段自2015年开始开展(CS)AMT法探测工作,经不断调整、优化,于2018年结束相关探测工作,累计探测10.98 km,依据探测成果对洞身附近不良地质体及围岩类别做出了推测。截止2022年11月,已完成7.85 km的开挖工作。现将已开挖洞段的实际地质状况与(CS)AMT法成果进行对比评价,得出(CS)AMT法探测准确率,并分析了影响(CS)AMT法电阻率变化的相关因素。This study examines an interbasin water transfer project in Xinjiang,characterized by a total length of over 40 km,and a maximum burial depth exceeding 2200 m,categorizing it as a deeply buried long tunnel.The project area features elevations surpassing 4500 m,steep relief,severe terrain dissection,and harsh natural conditions,which significantly challenge the use of conventional exploration methods such as drilling and tunnel probes.The controlled source audio frequency magnetotellurics((CS)AMT)method,noted for its deep detection capacities,minimal sensitivity to terrain effects,high resolution for low-resistivity anomalies,and strong applicability,has been widely used in engineering and resource investigations.From 2015 to 2018,the(CS)AMT method was applied in the main tunnel section of Segment IV of the project,completing a cumulative exploration length of 10.98 km through continuous adjustments and optimizations.The resulting data provided predictions about adverse geological formations and surrounding rock classifications along the tunnel alignment.By November 2022,7.85 km of the tunnel excavation had been completed.This study evaluates the accuracy of the(CS)AMT method by comparing its results with the actual geological conditions encountered during excavation and analyzes the factors influencing resistivity variations detected by the method.

关 键 词：深埋长隧洞 (CS)AMT法 不良地质体 围岩类别 对比评价 

分 类 号：P631[天文地球—地质矿产勘探]