Analytical solution for one-dimensional nonlinear consolidation of double-layered soil with improved continuous drainage boundary
Analytical solution for one-dimensional nonlinear consolidation of double-layered soil with improved continuous drainage boundary
复制标题
改进连续排水边界双层土一维非线性固结解析解
DOI：
10.1080/19648189.2020.1813207
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发表时间：
2020
影响因子：
2.1
通讯作者：
Meijuan Xu
中科院分区：
文献类型：
--
作者：
Zong Mengfan;Wenbing Wu;M. Hesham El Naggar;Guoxiong Mei;Pengpeng Ni;Meijuan Xu
摘要根据Davis和Raymond提出的假设，引入改进的连续排水边界条件，导出了双层土在恒定荷载作用下一维非线性固结的解析解。通过与其他现有分析方案和实验室固结试验结果进行比较，评估了本方案的有效性。对不同界面参数或应力比（即最终有效压力除以初始有效压力Nσ）下双层土的固结特性进行了参数化研究。结果表明：土体沉降U s定义的平均固结度随着Nσ的增大而增大，超孔隙水压力U p定义的平均固结度随着Nσ的增大而减小；U s的大小总是大于U p，且U s与U p的差值随着Nσ的增大而增大。与解相比较，在连续排水边界条件下，应力比Nσ对U p的影响较小。
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, Nσ ). 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 Nσ . 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 Nσ . Compared with the Xie's solution, the stress ratio Nσ has little effect on U p in the solution with continuous drainage boundary condition.