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针对基坑开挖应力路径的复杂性及土体剪切变形显著的特点 ,将椭圆抛物线双屈服面模型应用于开挖有限元分析 .该模型可避免常规模型 (如邓肯模型、修正剑桥模型等 )的理论局限 ,又可避免一些特殊模型要做非常规试验才能确定参数的缺点 .研究表明 ,按原有参数确定方法确定的KG 偏大 ,致使计算的支护桩体位移和地面沉降偏小 ,弯矩偏大 ,文中对其作了改进 .
According to the complexity of excavation stress path of excavation and remarkable feature of soil shear deformation, the elliptical parabola dual yield surface model is applied to excavation finite element analysis, which can avoid the conventional model (such as Duncan model, modified Cambridge model, etc.) ), And can avoid some shortcomings of some special models in order to determine the parameters by unconventional experiments.The research shows that the KG determined by the original parameter determination method is too large, resulting in the displacement of the supporting pile and the small settlement of the ground , Bending moment is too large, the paper made improvements.