地球物理学进展 ›› 2019, Vol. 34 ›› Issue (3): 1184-1191.doi: 10.6038/pg2019DD0145

• 应用地球物理学Ⅱ(海洋、工程、环境、仪器等) • 上一篇    下一篇

岩溶区地下溶洞综合物探探测试验研究——以福建省永安大湖盆地为例

黄光明1,2,赵举兴2,李长安1,林淑珍2   

  1. 1. 中国地质大学(武汉)地球科学学院,武汉 430074
    2. 福建省煤田地质勘查院,福州 350005
  • 收稿日期:2019-04-16 修回日期:2019-05-20 出版日期:2019-06-20 发布日期:2019-07-09
  • 作者简介:黄光明,男,1974年生,福建将乐人,在读博士研究生,高级工程师,主要从事岩土工程、水文地质、地质灾害调查及防治和城市地质研究工作.(E-mail: hgming01@126.com)
  • 基金资助:
    国家自然科学基金项目(41671011);福建省地质调查项目三明城市地质调查(201601)

Detection of underground karst caves by comprehensive geophysical exploration in karst area:taking Yongan Dahu basin in Fujian province as example

HUANG Guang-ming1,2,ZHAO Ju-xing2,LI Chang-an1,LIN Shu-zhen2   

  1. 1. School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
    2. Fujian Exploration Institute of Coalfield Geology, Fuzhou 350005, China
  • Received:2019-04-16 Revised:2019-05-20 Online:2019-06-20 Published:2019-07-09

摘要:

基于隐伏岩溶区地下溶洞的发育特征对城市开发建设的影响,利用综合物探方法开展灰岩区地下溶洞探测试验研究,获得地下溶洞探测物探方法的有效性具有重要的理论意义和应用价值.通过对包括福建永安大湖盆地内两处岩溶国家地下水监测井钻孔旁在内的三条综合物探剖面选用电测深法、高密度电法和微动探测法进行试验,并与钻孔资料进行对比分析、总结各种方法的岩溶物性特征,为探测地下溶洞提供物理依据.试验结果表明:区内地下溶洞在电测深和高密度电法勘探结果上主要表现为低阻异常,在微动探测成果上表现为S波速度低速异常;视S波速度为300~850 m/s及视电阻率小于100 Ω·m的半圈闭低阻异常,可作为研究区判断地下溶洞的地球物理依据.上述三种地面物探方法探测地下溶洞的有效性依次是:电测深法<高密度电法<微动探测法.对隐伏岩溶大范围进行地面探测时应结合测区的实际条件(如地质构造、地下水、溶洞充填物等情况)选用综合物探方法,并进行对比映证,从而揭示研究区的隐伏溶洞的分布发育规律,以此来指导岩溶区工程勘察,为钻探孔布置提供地球物理依据,减少钻探工程量和缩短探测周期.

关键词: 综合物探, 微动, 视S波速度, 地下溶洞, 永安大湖盆地

Abstract:

Based on the importance of karst development location and development degree, and the construction of modern cities, it has theoretical and practical values to acquire the effect of detecting underground karst caves with comprehensive geophysical exploration experiment in karst area. This study uses comprehensive geophysical exploration to detect the underground karst caves, and obtains the effective method of geophysical exploration in detecting underground karst caves. There are two karst groundwater monitoring wells and a profile of comprehensive geophysical exploration in the Yongan Dahu basin of Fujian province. Electrode sounding, high-density resistivity and microtremor are used in the well drilling cores and profile, to get the characteristic of each geophysical exploration with the formations of drilling cores(including lithologic character,stratum,hydrogeological character and engineering geological character), for detecting underground karst caves. The results show under karst caves are low resistivity abnormal bodies by electrode sounding, high-density resistivity, and low velocity abnormal S wave by microtremor. S wave velocity with 300~850 m/s and low resistivity abnormal bodies with apparent resistivity less than 100 Ω·m could be used in detecting underground karst caves in the study area. The availability of the above methods in the study area is as follow: electrode sounding

Key words: Comprehensive geophysical exploration, Microtremor survey, S-wave velocity, Underground karst caves, Yongan Dahu basin

中图分类号: