含隧道路基承载力弹塑性渐进破坏数值试验

摘要

首先介绍了一种峰后参数取值的实用方法,并对Prantdl经典问题进行验证证明了本数值试验的有效性,然后以大连地铁在建工程作为实验对象,分别采用摩尔—库仑模型和应变软化模型进行了加载实验,比较基于两种本构模型得到的极限承载力—位移曲线,结果表明摩尔—库仑模型的实验结果偏于安全,并获得路基隧道渐进破坏模式。%The thesis firstly introduces the practical method of post-peak parameter valuating,testifies the classical Prantdl issue,and proves the effectiveness of the numerical test.Secondly,taking the construction in process of Dalian subway engineering as the experimental object,it respectively carries out loading test by applying Mohr-Coulomb model and strain softening model,and compares the ultimate bearing capacity-displacement curve of two constructive models.Results show that the experimental result of Mohr-Coulomb model tends to be safe and obtains gradual roadbed failure mode.