Application of comprehensive geophysical prospecting method in detecting concealed karst collapses
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摘要: 我国岩溶分布范围广泛,岩溶区地质环境脆弱,地质灾害频发,严重威胁到人民群众的生命财产安全,造成了巨大的经济损失。本文采用可控源音频大地电磁法(CSAMT)和微重力法,通过二维拟断面反演、小波多尺度提取剩余重力异常,较好地划分了岩溶区的岩土界面及强岩溶发育带,圈定了溶洞的位置、埋深、规模及空间分布情况。通过钻孔验证,CSAMT解释的岩土界面及强岩溶发育带与钻孔基本吻合,微重力圈定的塌陷溶洞规模及埋深与工勘钻孔基本吻合,表明CSAMT配合微重力法在探测隐伏岩溶塌陷时效果较为显著,可为潜在的岩溶塌陷区及类似地质灾害防治预警提供科学探查方法。Abstract: Karst is widely distributed in China. However, geological disasters frequently occur in karst zones due to the fragile geological environment, which seriously threatens the safety of people’s life and property and cause huge economic losses. In this study, the controlled source audio-frequency magnetotelluric (CSAMT) method and microgravity were used to extract residual gravity anomalies through the two-dimensional inversion of pseudosections and multi-scale wavelet analysis. As a result, rock-soil interfaces of karst zones and the development zones of strong karst were well divided; the locations, burial depths, scales, and spatial distribution of karst caves were delineated. As verified by drilling, the rock-soil interfaces and strong-karst development zones determined by CSAMT interpretation were roughly consistent with those revealed by boreholes, and the sizes and burial depths of collapsed karst caves that were delineated by microgravity roughly correspond to those revealed by boreholes of engineering exploration. These results show that the CSAMT combined with the microgravity method can achieve significant effects in the detection of concealed karst collapses and serves as a scientific detection method for the early warning of the prevention and treatment of potential karst collapses and similar geological disasters.
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Key words:
- karst collapse /
- CSAMT /
- microgravimetry
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