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针对传统一维大变形固结理论不能考虑土体次固结变形的缺点,在连续介质力学有限变形理论和土力学固结理论基础上,提出了全新的一维大变形主、次固结耦合模型。该模型采用超静孔压为控制变量,可以分别表述为欧拉坐标、拉格朗日坐标和固相体积坐标等三种形式,其中均可以显式地反映出土体重度变化、固相速度、地表沉降速度、地下水位变化、荷载变化和次固结等6个因素的影响。在不同简化条件下,新模型可以分别退化为以往学者提出的相关模型。当不考虑次固结效应时,新模型与经典的Gibson大变形固结模型完全等价。从便于工程应用的角度而言,新模型中仅考虑次固结和外荷载变化的退化形式更便于求解,可作为一种供参考的实用模型。
Aiming at the defect that traditional one-dimensional large deformation and consolidation theory can not consider soil sub-consolidation deformation, based on the theory of finite deformation of continuum mechanics and the theory of soil mechanics consolidation, a new one-dimensional large deformation primary and secondary consolidation coupling model. The model uses the excess pore pressure as the control variable and can be expressed as Eulerian coordinates, Lagrangian coordinates and solid-phase volume coordinates, respectively. All of these models can explicitly reflect the changes of heavy soil mass, solid-phase velocity, Surface subsidence speed, groundwater level changes, load changes and secondary consolidation 6 factors. Under different simplification conditions, the new model can be degenerated into the related models proposed by previous scholars respectively. When the secondary consolidation effect is not considered, the new model is completely equivalent to the classical Gibson large deformation consolidation model. From the perspective of ease of engineering application, the new model only considers the degradation form of secondary consolidation and the change of outer load, which is more convenient for solving. It can be used as a practical model for reference.