跨孔电阻率CT法在岩溶精确勘探中的应用研究
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摘要
贵州碳酸盐岩分布广泛,岩溶问题突出,给各类工程建设造成极大的安全隐患和巨大损失,岩溶勘察尤显重要。当前岩溶勘探以物探方法为主,但各方法本身存在局限性,影响岩溶的精细化勘探。在分析岩溶物理电性特征的基础上,选择跨孔电阻率CT法,并从应用的角度出发,研究跨孔电阻率CT法孔内电极接地、各装置对比、数据采集方式等多方面内容,得出跨孔电阻率CT法是一种方便、高效、高精度和高分辨率的物探方法,在岩溶地区具有极大的应用前景,并以实例举证说明。
Carbonate rocks are widely distributed in Guizhou, and karst problems are prominent, which cause great potential safety hazards and huge losses to various engineering construction. Karst exploration is particularly important. At present, geophysical prospecting is the main method of karst exploration, but each method has its own limitations, which affects the fine exploration of karst. Based on the analysis of the physical and electrical characteristics of karst, the cross-hole resistivity CT method is selected. From the point of view of its application, the grounding of the electrode in the hole, the comparison of various devices and the way of data acquisition are studied. It is concluded that the cross-hole resistivity CT method is a convenient, efficient, high precision and high resolution geophysical exploration. The method has great application prospects in karst areas and is illustrated by examples.
Carbonate rocks are widely distributed in Guizhou, and karst problems are prominent, which cause great potential safety hazards and huge losses to various engineering construction. Karst exploration is particularly important. At present, geophysical prospecting is the main method of karst exploration, but each method has its own limitations, which affects the fine exploration of karst. Based on the analysis of the physical and electrical characteristics of karst, the cross-hole resistivity CT method is selected. From the point of view of its application, the grounding of the electrode in the hole, the comparison of various devices and the way of data acquisition are studied. It is concluded that the cross-hole resistivity CT method is a convenient, efficient, high precision and high resolution geophysical exploration. The method has great application prospects in karst areas and is illustrated by examples.
引文
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[2] 李术才,舒茂鑫,薛翊国,等.城市地铁跨孔电阻率CT超前地质预报方法研究[J].岩石力学与工程学报,2014,33(5):913-920.
[3] 刘征宇.电阻率跨孔CT探测方法及其工程应用[D].济南:山东大学,2014.
[4] 董清华,曹俊兴.井间电阻率层析成像的几个问题研究[J].地球物理学进展,1998,13(4):84-89.
[5] 李晓芹,陶裕录,冯锐,等.电阻率层析成像的原理与初步应用[J].地震地质,1998,20(3):234-242.
[6] 王桦,纪洪广.跨孔直流电阻率法CT勘探技术研究[J].地球物理学进展,2010,25(5):1833-1840.
[7] 王俊超,师学明,万方方,等.探测孤石高阻体的跨孔电阻率CT水槽物理模拟实验研究[J].CT理论与应用研究,2012,21(4):647-657.
[8] 李金铭.地电场与电法勘探[M].北京:地质出版社,2005.