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| 基金项目：国家自然科学基金重大项目“治沟造地工程地质与土壤湿陷稳定技术与标准”（41790443），国家自然科学基金优秀青年科学基金项目“隧道不良地质超前探测与灾害防控”（51922067） |
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| 摘要： |
| 南京地铁4号线桦墅站—仙林东站区间现场钻探时在部分钻孔中发现规模较大的溶洞，为探明区内溶洞的大小和分布情况，结合区域工程地质与水文地质条件，分析岩土介质的地球物理特征，采用超高密度电法对研究区进行地电测量，经反演分析获取地电阻率图像，结合岩溶的电阻率异常响应特征，在隧道纵横方向上分别采用地面方式和井井方式相互验证，判别岩溶的分布范围、走向、大小及埋藏深度。研究结果表明，超高密度电法在上覆型岩溶勘察中具高精度、高效率、直观性等特点，解释成果与钻探揭示验证一致，为土-岩-空洞三元结构的探测提供了一种新方法。 |
| 关键词：上覆型岩溶 岩溶探测 超高密度电法 南京地铁 |
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| Abstract: |
| In the field drilling from Huashu Station to Xianlin East Station of Nanjing Metro Line 4, some large-scale karst caves were found in some boreholes. In order to determine the size and distribution of karst caves in the field, this paper analyzes the geophysical conditions of the geotechnical medium in the field based on its engineering geological and hydrogeological conditions, selects the ultra-high density resistivity method to conduct the geoelectrical survey of resistivity, and obtains earth resistivity images through the inversion analysis. Based on the resistivity images and the abnormal response characteristics of karst resistivity, the distribution range, strike, size and buried depth of its karst can be distinguished by ground acquisition and well-well acquisiton in the vertical and horizontal directions of a tunnel. The research results show that the ultra-high density resistivity method is charaterized by high precision, high efficiency and intuition in the exploration of the overlying karst. The interpretation results are consistent with the drilling results, which indicates that this method provides a new direction for the detection of soil-rock-cavity ternary complex. |
| Keywords:overlying karst karst exploration ultra-high density resistivity method Nanjing Metro |
| 惠军,谭维佳.超高密度电法在上覆型岩溶勘察中的应用[J].地质学刊,2022,46(1):84-90 |
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