摘要
为了研究刚性地基极限承载力的形状效应问题,以弹塑性有限元理论为基础,使用与Mohr-Coulomb准则等效的基于光滑连续屈服面的Drucker-Prager(D-P)准则,分别就条形基础(采用平面应变单元)和圆形基础(采用轴对称单元)的地基极限承载力问题进行了数值分析。与经典承载力计算方法的对比证明了本方法的正确性与可行性,分析结果表明:基底粗糙程度和内摩擦角是影响形状系数的重要影响因素。
In order to study the shape effect of bearing capacity of rigid foundation,based on elasto-plastic FEM theory,adopted the DP criterion equivalent to Mohr-Coulomb criterion inside-smooth continuous yield plane,the ultimate bearing capacity of the strip foundation（using plane strain unit）and circle foundation（using axisymmetric unit） is numerically analyzed.It verifies the correctness and feasibility of the method compared with the classical methods.The results show that the shape coefficient is controlled by the roughness of base and inner friction angle of soil.
出处
《勘察科学技术》
2010年第3期3-6,61,共5页
Site Investigation Science and Technology
关键词
地基极限承载力
刚性基础
增量加载
平面应变
轴对称
ultimate bearing capacity of foundation
rigid foundation
step incremental loading
plane-strain
axisymmetry
