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Study on constitutive model of excavating foundation pit soil

机译：基坑基坑开挖本构模型研究

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The stress of the soil mainly for unloading instead of regular loading in the process of excavating foundation pits, but conventional loading test methods were taken to determine the soil parameters and applied to the numerical analysis and design calculation for a long time. The stress-strain curve of the soil masses is nonlinear, so there is a great difference between the loading modulus and the unloading modulus of the soil masses, which has great impact on the deformation of soil masses. During the pit excavation, the soil stressstrain relationship is also affected by the stress path. The paper deduced the expression of unloading modulus according to unloading stress-strain curve relationship expressed in form of the hyperbolic, and explored the relationship between the initial unloading modulus and initial deviation stress, then established a nonlinear geotechnical material constitutive model applies to underground excavation soil, comparing with traditional loading mechanical model Duncan-Chang. Numerical simulation showed that the model unloading were closer to the engineering practice than conventional algorithms.
机译：在基坑开挖过程中，土体的应力主要由卸载而不是有规律的加载引起，但是长期采用传统的加载试验方法确定土体参数，并应用于数值分析和设计计算。土体的应力-应变曲线是非线性的，因此土体的加载模量和卸载模量之间存在很大差异，这对土体的变形影响很大。基坑开挖过程中，土的应力应变关系也受应力路径的影响。根据双曲线形式的卸载应力-应变曲线关系推导了卸载模量的表达式，探​​讨了初始卸载模量与初始偏差应力之间的关系，建立了适用于地下基坑土体的非线性岩土材料本构模型。与传统的加载力学模型Duncan-Chang进行比较。数值仿真表明，模型卸载比常规算法更接近工程实践。

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