生土地坑窑结构坍塌破坏判断指标的确定

为了分析生土地坑窑结构坍塌破坏的内在机理,找到坍塌破坏的判断指标,采用插值法分析了地坑窑结构的极限状态,通过不同极限状态的对比分析,提出了窑腿相对塑性区深度RPD的概念。分析表明:无量纲指标RPD反映了不同状态下窑腿塑性区的发展程度,可确定为地坑窑结构坍塌破坏的判断指标。研究成果为进一步探讨在役地坑窑结构的安全可靠性及改造、加固提供了科学依据。

A study on failure index of earth-dwelling cave

In order to analyse the internal mechanism of collapse and failure of earth-dwelling caves and find out the index for assessment,the interpolation method was used to analyse the limit state of cave structures.By a comparison analysis to various factors that affect the limit state,the authors have proposed a concept of the dimensionless relative depth of plastic zone of a cave leg.The analysis showed that the relative depth of plastic zone of a cave leg reflected the development of plastic zone of cave legs in earth-dwelling cave structures under different states,and it can be the index of assessment for structural collapse and failure.The analysis results provide a scientific basis for further exploring of the safety,reliability,improvement and reinforcement of in-service earth-dwelling caves.