Combining with a engineering examples,this paper introduced the structure distribution situation of rock and soil layer in the site,ac-cording to the site surface water and groundwater characteristics,elaborated the forming reasons of soil cave,and provided effective treatment ways,accumulated experience for similar project.%结合某工程实例，介绍了该工程场地内岩土层的结构分布情况，根据场地内地表水及地下水特征，阐述了土洞的形成原因，并提出了有效的治理方法，为类似工程积累了施工经验。
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