地质雷达在大面积复杂岩溶场地勘察中的应用研究

Study on application of geological radar in the ground investigation work in the large and complex karst area

本文以西部山区某机场为例,通过与电法及地震勘探在地形、覆盖层厚度、场地平整度、岩性、探测速度、费用等方面的对比分析,系统地研究了地质雷达在大面积复杂岩溶场地勘察中运用的适宜性与经济性。通过在施工勘察中大规模运用,进一步表明地质雷达适宜于场地平整、覆盖层较薄、地层较单一地段的大面积复杂岩溶场地勘察,探测有效深度15m左右,最佳探测深度10～12m;不适宜于地形、地层和构造复杂、有深厚覆盖层及大深度区段的复杂岩溶场地的勘察。

This paper by taking an airport project in mountain area in west China as example, gives a systematic research about the appropriateness and economical efficiency of the application of geological radar in exploring large and complex karst area from the aspects such as surface feature, the thickness of covering layer, the flatness of the field, lithology, survey rate and the cost by comparing with electrical method and seismic method. It turns out that geological radar is appropriate for flat, shallow covering layer and simple strata area. The effective detect depth is about 15m, and the best detection depth is 10 -12m. This method is not suitable for the karst area with complex surface feature, strata, geological structure and thick covering layer, or existing in the deep ground.