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以桂林市某体育场岩溶塌陷为例,结合当地塌陷发生的规律,在已有塌陷理论的基础上对该类型塌陷进行分析。该塌陷位于漓江二级阶地,所处地势较低,具有下伏基岩岩溶发育强烈,上覆土层厚度大且松散,地下水活动频繁等地质特点。采用潜蚀理论对影响塌陷形成的各个特点进行定性、定量和对比分析,最终综合得出该塌陷的形成过程和关键诱因。根据其深度范围大、松散土层厚、岩溶发育强烈、地下水活动频繁等特点,结合桂林地区处理软土、土洞及塌陷的施工经验,讨论了灌浆法在本工程具体处理措施中的应用。
Taking karst collapse in a stadium in Guilin as an example, this type of collapse is analyzed on the basis of the existing collapse theory according to the law of local collapse. This subsidence is located on the second terrace of the Lijiang River, where the terrain is relatively low. The subsidence is characterized by the following strong karstification of underlying bedrock, thick and loose overburden, and frequent groundwater activities. Using the theory of potential erosion to qualitatively, quantitatively and comparatively analyze the various characteristics that affect the formation of the collapse, the formation process and the key inducement of the collapse are finally concluded. According to the characteristics of large depth range, loose soil layer, strong karst development and frequent groundwater activities, the application of grouting method in the specific treatment measures of this project is discussed with the construction experience of dealing with soft soil, soil cave and collapse in Guilin area.