通过引入德鲁克-普拉格屈服准则,研究路基下溶洞顶板安全厚度的计算方法,考虑了溶洞顶板受到路基荷载可能发生的冲切破坏等3种形式,提出了一种顶板安全厚度计算模型,并结合结构力学理论,得到了各种破坏模式下溶洞顶板安全厚度的计算表达式;最后结合工程实例进行验算,结果表明该方法可用于实际工程.%Drucker-Prager yield criteria is introduced in this work to study the calculation method for safety thickness of karst top roof.Considering three possible failure patterns of karst top roof beneath the expressway,such as punching failure,and Structural Mechanics,one calculation model for safety thickness of karst top roof is proposed and the expressions of safety thickness in different failure types are obtained.Finally,the feasibility of this method is validated by comparing with the practice engineering.
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