Abstract

Accreting soil system with horizontal drainage layers (HDLs) widely exists in engineering practices. With the existence of HDLs, each soil layer undergoes two stages: layer formation stage and surcharge loading stage. The methods proposed by Gibson and Zheng et al. are adopted to derive the analytical solution for the layer formation stage, while the separation of variables method and Duhamel’s principle are combined to develop that for the surcharge loading stage. The solution is verified against two existing analytical solutions and a numerical model. Parametric studies are then conducted to investigate the consolidation characteristics. Given a certain design height of accreting soil system, an upper limit of the maximum excess pore-water pressure (ULMP) is observed with HDLs if consolidation coefficient is large enough or accreting rate is small enough. When ignoring the interlayer formation interval, ULMP is inversely proportional to the consolidation coefficient and proportional to the accreting rate and the square of layer thickness. A prediction method for the time when ULMP appears is provided considering the influence of accreting rate, layer thickness, and consolidation coefficient. A design chart for reference value of the maximum layer thickness is also proposed.

摘要

具有水平排水层（HDLs）的土壤系统在工程实践中广泛存在。由于HDLs的存在，每个土层都经历了两个阶段：层形成阶段和超载加载阶段。Gibson 和 Zheng 等人提出的方法。地层形成阶段的解析解，结合变量分离法和Duhamel原理得到超载加载阶段的解析解。该解决方案针对两个现有的解析解和一个数值模型进行了验证。然后进行参数研究以调查固结特征。给定一定的增生土系统设计高度，如果固结系数足够大或增生率足够小，则可以用 HDL 观察到最大超孔隙水压力 (ULMP) 的上限。当忽略层间形成间隔时，ULMP 与固结系数成反比，与增生率和层厚的平方成正比。考虑了增生率、层厚和固结系数的影响，给出了ULMP出现时间的预测方法。还提出了最大层厚参考值的设计图。考虑了增生率、层厚和固结系数的影响，给出了ULMP出现时间的预测方法。还提出了最大层厚参考值的设计图。考虑了增生率、层厚和固结系数的影响，给出了ULMP出现时间的预测方法。还提出了最大层厚参考值的设计图。