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为保障深埋长隧洞安全开挖及优化线路方案，需精准查明蚀变风化深槽等不良地质体的分布范围。音频大地电磁法(Audio-frequency Magnetotelluric Method, AMT)凭借其成本低、效率高、探测深度大的优势，在此类探测中具有不可替代的作用。本文基于研究区地质与地球物理特征，论证了采用AMT的必要性；详细阐述了AMT的基本原理、数据采集与处理流程；结合地质资料与钻孔信息，对电阻率反演剖面进行综合解释；通过在优化线路上布设的2条横剖面和2条纵剖面，系统查明了溶蚀风化深槽、断层及其影响带的空间展布。钻探岩芯揭示整孔岩芯较完整，没有出现明显的绿泥石化、蒙脱石化及石膏化蚀变，饱和抗压强度超过80 MPa,岩体声波速度一般为4 800～6 000 m/s,说明围岩质量较好。解释成果与钻孔资料高度吻合，验证了AMT应用效果显著，为隧洞设计与施工提供了可靠的技术支撑。
Abstract：To ensure the safe excavation of deep-buried long tunnels and optimize the route alignment, it is essential to accurately delineate the distribution of adverse geological bodies such as altered and weathered deep troughs. The audio-frequency magnetotelluric(AMT) method, with its advantages of low cost, high efficiency, and great detection depth, proves indispensable for such investigations. Based on the geological and geophysical characteristics of the study area, this paper demonstrates the necessity of employing the AMT method. It then elaborates on the fundamental principles of AMT and details its key technical procedures, including data acquisition and processing. Subsequently, integrated interpretation of resistivity inversion profiles is conducted through the combination of geological data and borehole information. Through two transverse and two longitudinal profiles along the optimized route, the spatial distribution of karstified-weathered troughs, faults, and their associated influenced zones within the study area was systematically identified. The drilling core reveals that the core at the entire borehole is relatively intact, without significant chloritization, montmorillonitization, or gypsum alteration. The saturated compressive strength exceeds 80 MPa, and the rock body acoustic wave velocity generally ranges from 4 800 to 6 000 m/s, indicating good surrounding rock quality.The interpreted results show a high correlation with borehole data, validating the significant effectiveness of AMT. This study provides reliable technical support for subsequent tunnel design and construction.
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基本信息:
中图分类号:TV68
引用信息:
[1]汤浩,包勋.AMT在引调水工程线路优化中的应用[J].工程地球物理学报,2025,22(06):615-622.
基金信息:
国家自然科学基金(编号：51174012);国家自然科学基金青年基金(编号：51608461); “环北部湾广东水资源配置工程蚀变风化岩体分布规律及其勘察方法研究”项目(编号：2021056Q2023-0226)