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结合考虑时间效应的统一硬化(UH)模型得到一维固结下土的一维应力-应变关系,以此建立一维固结控制微分方程,可以统一考虑土的主、次固结变形.采用差分方法对单面排水固结问题进行了分析,加载初期不透水层处存在有效应力减小的松弛现象,推导了不透水层处有效应力随时间减小的公式并进行分析.随后,采用数值方法分析了次固结系数、超固结度、压缩回弹系数等因素对固结的影响规律,分析结果也验证了所得公式的结论.此外,通过室内试验对控制方程预测规律进行了验证分析.当主固结基本完成后,变形主要由次固结产生,基于这个条件推导了平均固结度与时间的关系,该公式可以用于计算固结基本完成需要的时间.
One-dimensional stress-strain relationship of soil under one-dimensional consolidation is obtained by using the unified hardening (UH) model considering time effect, so that one-dimensional consolidation governing differential equation can be established and the main and secondary consolidation deformation of soil can be considered uniformly. Differential method was used to analyze the single-side drainage consolidation problem. The relaxation of the effective stress decreases in the impermeable layer at the initial stage of loading, and the formula of decreasing the effective stress with time in the impermeable layer is derived and analyzed. Subsequently, The influence of factors such as secondary consolidation coefficient, super-consolidation degree and compression-resilience coefficient on the consolidation was analyzed and the results also verified the conclusion of the formula.Furthermore, the prediction of the governing equation was verified by laboratory test When the main consolidation is basically completed, the deformation is mainly produced by the secondary consolidation. Based on this condition, the relationship between the average consolidation degree and the time is derived. This formula can be used to calculate the time required for the consolidation to be completed substantially.