摘要
为了对浅基础地基极限承载力的主要影响因素进行系统分析,采用关联流动的Mohr-coulomb内切圆屈服准则,通过增量加载的有限元方法,全程模拟了地基由初始的线弹性状态逐渐过渡到塑性流动的极限破坏状态的过程。通过对几种主要因素的对比分析,并结合对照国内外模型试验成果,可知基础刚度和基底粗糙程度对无重土地基的极限承载力影响不大,但刚度和基底粗糙程度对临塑荷载有明显的影响;主要土力学参数对地基破坏机理的影响存在着明显的区别。
In order to analyze main bearing-capacity factors of shallow foundation, Mobr-coulomb inside-tangent circle yield criterion and associated flow rule were adopted, the overall process of foundation from elasticity to plasticity gradually was modeled by elastoplastic FEM through step increment method . Computed results of several main factors were compared and integrated with some important results of domestic and foreign model tests. It was shown that ultimate bearing capacity of weightless foundation has slight relation with the stiffness and roughness of foundation while plasticity-entrance load are obviously different due to stiffness and roughness. The destroy mechanism of foundation was influenced greatly by the main earth parameter.
出处
《武汉理工大学学报》
EI
CAS
CSCD
北大核心
2007年第4期99-102,共4页
Journal of Wuhan University of Technology
基金
西部交通建设科技项目(200431822311)
关键词
屈服准则
增量加载
柔性基础
刚性基础
yield criterion
step increment method
flexible foundation
rigid foundation
