Abstract

Following the assumptions proposed by Davis and Raymond, an analytical solution for one-dimensional nonlinear consolidation of double-layered soil under constant loading is derived by introducing an improved continuous drainage boundary condition. The effectiveness of the present solution is assessed by comparing against other existing analytical solutions and laboratory consolidation test results. A parametric study is then conducted to investigate the consolidation behaviour of double-layered soil for different interface parameters or stress ratios (i.e. final effective pressure over initial effective pressure, N_σ). The results show that, the average consolidation degree defined by soil settlement U_s increases with the increase of N_σ, and the average consolidation degree defined by excess pore water pressure U_p decreases with the increase of N_σ. The magnitude of U_s is always larger than U_p, and the difference between U_s and U_p increases with the increase of N_σ. Compared with the Xie's solution, the stress ratio N_σ has little effect on U_p in the solution with continuous drainage boundary condition.

摘要

遵循 Davis 和 Raymond 提出的假设，通过引入改进的连续排水边界条件，导出了恒定荷载下双层土的一维非线性固结的解析解。通过与其他现有分析解决方案和实验室合并测试结果进行比较来评估本解决方案的有效性。然后进行参数研究以研究双层土在不同界面参数或应力比（即最终有效压力与初始有效压力N _σ之比）下的固结行为。结果表明，土壤沉降U _{s定义的平均固结度随着}N的增加而增加_σ和由超孔隙水压力Up定义的平均固结度随着N _σ的增加而_减小。U _s的大小总是大于U _{p ，并且随着}N _σ的增加，U _s和U _p之间的差值增加。与谢氏解相比，在具有连续排水边界条件的解中，应力比N _σ对U _p的影响很小。