基于双剪强度理论的溶洞顶板冲切破坏研究  

The Research on Punching Failure of Cave Roof by the Twin Shear Strength Theory

作　　者：苏伟 

机构地区：[1]湖南省永龙高速公路建设开发有限公司,湖南永顺416700

出　　处：《公路工程》2016年第2期213-216,共4页Highway Engineering

摘　　要：为了考虑中间主应力溶洞顶板发生冲切破坏的影响,引入双剪强度破坏准则,在极限分析上限定理的基础上,确立了符合溶洞顶板冲切破坏的计算模型。根据功能原理,推到出了溶洞顶板发生冲切破坏时的极限承载力和溶洞顶板安全厚度计算公式。并用工程实例进行了验证,理论计算结果与工程实际情况一致,可以为工程实践提供一定的参考价值。In order to consider the effect of intermediate principal stress when the cave roof have punching failure,the twin shear strength theory have been introduced. Also the punching failure calculation model of cave roof been determined based on the theorem of the upper bound of limit analysis. According to the work-energy principal,the calculation formula of ultimate bearing capacity and cave roof safe thickness when the roof have punching failure. The theory result convinced by the engineering example,so it is can give reference value on engineering practice.

关 键 词：双剪理论 溶洞顶板 冲切破坏 安全厚度 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]