Study on application of borehole radar reflection imaging in the detection of karst area
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摘要: 我国岩溶区分布广泛，且复杂的岩溶现象对建筑安全、地基稳定以及场地勘察有较大影响。钻孔雷达作为一种井中地球物理方法，可以利用地下介质的物性差异查明岩溶发育的情况，弥补常规勘察手段在探测岩溶发育场地中存在的不足。依据钻孔雷达单孔反射信号的同相轴特征、反射波首波走时和反射波的衰减等特征，可判断钻孔周边未揭露溶洞和裂隙的分布，确定钻探揭露溶洞的水平方向直径以及岩石完整性，从而达到查明各种岩溶形态的规模、空间密度及其分布规律的目的，为工民建各项工程建设的设计和施工提供准确详尽的地质资料，确保工程的稳定性。Abstract: Karst area are widely distributed in China, and complex karst phenomena have great influence on the safety of building site and foundation stability and site survey. As a geophysical method in the well, borehole radar can make use of the difference of physical properties of underground media to find out the situation of karst development, and make up for the shortcomings of the conventional survey methods in detecting karst development sites. The characteristics of the homogenous axis of the single-hole radar reflection signal, the travel time of first arrival wave of the reflected wave and the attenuation of the reflection wave, can be used to determine the distribution of uncovered karst caves and fissures around the borehole. This technique method can also be applied to identifying the diameter of karst caves in horizontal direction and intact rocks surrounding the caves. Borehole radar detection can find out the size, density and spatial distribution of various karst forms, so as to provide accurate and detailed geological data for the design and construction of various engineering construction projects, and to ensure the stability of the projects.
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Key words:
- karst detection /
- ground penetrating radar /
- borehole radar /
- reflection imaging
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