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通过研究武汉地区碳酸盐岩条带的分布规律,着重研究了碳酸盐岩线岩溶率随基岩面以下埋深的变化规律。发现基岩面下浅部强岩溶下方,均存在有一弱岩溶带,其线岩溶率一般小于3%,该弱岩溶带在孔间CT剖面上有明显的表现。如果选择线岩溶率7%为标准,则线岩溶率所反映的弱岩溶带顶板在基岩面下的埋深与物探CT给出的相对完整基岩顶板基本吻合。弱岩溶带不仅可以作为选择桩基础设计的参考层位,而且也可作为“上部粉细砂、下部碳酸盐岩”地质结构地区岩溶地质灾害防治时水平帷幕的依托层。
By studying the distribution of carbonate bands in Wuhan area, the variation of carbonate rock line karst rate with the depth below the bedrock surface is emphatically studied. It is found that there is a weak karst zone below the strong karst in the shallow basement of the bedrock. The karst rock formation rate is generally less than 3%. The weak karst zone shows obvious features on the inter-well CT profiles. If 7% of the line karat is selected as the standard, the depth of the weak karst roof reflected by the line karst rate under the bedrock surface is basically consistent with that of the relatively intact bedrock given by the geophysical CT. Weak karst can not only be used as a reference layer for the selection of pile foundation design, but also be used as a backing layer for horizontal curtains in the prevention and control of karst geological disasters in the upper part of fine sand and lower carbonate rocks.