综合物探在城市地下空间地质调查隐伏断层探测中的应用

Application of Integrated Geophysical Methods in the Detection of Hidden Faults in Urban Underground Space Investigation

城市地下空间地质调查工作目前在全国许多城市中如火如荼地开展,选择合适的调查手段会使得这项工作事半功倍。一些物探方法凭借其无损、高效、抗干扰能力强等优点在城市地质调查工作中备受青睐,但是面对城市复杂的工况,单一的物探方法往往无法有效探明城市地下地质构造,须通过多种物探手段联合开展勘察,相互佐证,才能真正有效地对城市地下地质构造进行精细查找。等值反磁通瞬变电磁法和微动法是近几年来发展较快的物探方法,广泛地应用于各个领域。本文以成都市地下空间调查工作中包江桥隐伏断层探测工作为背景,将等值反磁通瞬变电磁法和微动法联合起来探测该隐伏断层的具体位置和走向,最后将综合物探成果与以往地质调查资料作对比,结果吻合性基本一致,证明该综合物探组合在强干扰的城市环境中能够有效识别隐伏断层位置,为城市地下空间调查工作提供了一种行之有效的物探组合手段。

The geological survey of urban underground space is currently being carried out in full swing in many cities across the country,and choosing appropriate survey methods will make this work more effective.Some geophysical prospecting methods are favored in urban geological surveys due to their advantages such as non-destructive,high-efficiency,and strong anti-interference ability.However,in the face of complex working conditions of cities,a single geophysical method is often unable to effectively detect urban underground geological structures.Therefore,it is necessary to carry out joint investigation and mutual evidence through a variety of geophysical exploration methods,so as to detect the urban underground geological structure effectively.The opposing coils transient electromagnetic method and the microtremor survey method are geophysical prospecting methods which have developed rapidly in recent years and are widely used in various fields.Based on the investigation of Baojiangqiao buried fault in Chengdu,the equivalent antimagnetic transient electromagnetic method and fretting method are combined to detect the specific location and strike of the buried fault.Finally,the comprehensive geophysical prospecting results are compared with the previous geological survey data,and the results arebasically consistent,which proves that the comprehensive geophysical prospecting combination can effectively identify the location of hidden faults in the strongly disturbed urban environment,and provides an effective geophysical prospecting combination method for the investigation of urban underground space.