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本文通过对红粘土中土洞的勘探、测试、分析研究，总结了土洞存在的条件、形成机制及特征类型，评价了建筑场区的工程稳定性特征。
Through the exploration, testing and analysis of soil caves in red clay, this paper summarizes the existence conditions, formation mechanism and types of soil caves, and evaluates the engineering stability characteristics of the site.