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岩溶发育情况对于桥梁基础方案的确定十分重要。覆盖型岩溶和埋藏型岩溶,由于埋藏于地下,加强对钻孔中溶洞的分析,对于查明桥址区岩溶的特征有重要的指导意义。根据湖南省某高速公路大桥逐桩钻探48个钻孔的成果,详细分析了钻孔中灰岩面起伏、溶洞顶板高程、溶洞底板高程、溶洞顶板和灰岩面的距离、溶洞底板和灰岩面的距离、钻孔中溶洞总高度、岩溶率、钻孔遇洞率等多个指标的统计特征,评价了各个指标对岩溶发育特征的指示作用。
The development of karst is very important for the determination of bridge foundation plan. Covering karstification and burial karst, as buried in the ground, to strengthen the analysis of karst caves hole, for identifying the characteristics of karst bridge site has an important guiding significance. According to the results of 48 drill-by-one-pile drilling of a highway bridge in Hunan Province, this paper analyzes in detail the fluctuation of limestone surface, the elevation of cave roof, the elevation of cave floor, the distance between cave roof and limestone surface, the cave floor and limestone Surface distance, the total height of karst caves in the borehole, the karst rate, the ratio of holes encountered in the borehole, and so on. The evaluation indexes of karst development characteristics were evaluated.