The Application of Comprehensive Geophysical Prospecting Method in Karst Exploration
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勘察喀斯特地貌对于工程建设和环境保护而言具有重要意义.然而,喀斯特地区地质条件复杂,传统的地质勘察方法往往难以全面、准确地揭示地下喀斯特特征.文章以某工程为研究背景,探究了综合物探法中的电磁法和弹性波CT法在喀斯特勘察中的应用,并将勘探结果与现场的钻探结果进行对比.结果表明,喀斯特主要存在于土岩交接面处并逐渐侵蚀,向岩体内部发展,其发展有较明显的方向性.浅部溶蚀深度为10 m,中风化泥质灰岩内部不存在喀斯特,土岩交界面处的喀斯特呈现串珠状.喀斯特体积效应和发育不确定性导致物探法与钻孔测定存在一定的偏差,偏差距离一般为3～5 m.
The exploration of karst landform is of great significance for engineering construction and environmental protection.However,the geological conditions in karst areas are complex,and traditional geological exploration methods are often difficult to comprehensively and accurately reveal the characteristics of underground karst.Taking a project as the research background,this paper explores the application of electromagnetic method and elastic wave CT method in comprehensive geophysical prospecting method in karst exploration,and compares the exploration results with the field drilling results.The results show that the karst mainly exists in the soil-rock interface and gradually erodes to the interior of rock mass,and its development has obvious direction.The shallow corrosion depth is 10 m,there is no karst in the moderately-weathered argillaceous limestone,and the karst at the soil-rock interface is in the shape of beads.The karst volume effect and development uncertainty lead to a certain deviation between geophysical prospecting and borehole measurement,and the deviation distance is generally 3-5 m.
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