Vertical drains are usually installed in subsoil consisting of several layers, Due to the complex nature of the problem, over the past decades, the consolidation properties of multi-layered ground with vertical drains have been analysed mainly by numerieal methods. An analytical solution for consolidation of double-layered ground with vertical drains under quasi-equal strain condition is presented in this paper. The main steps for the computation procedure are listed. The convergence of the series solution is discussed. The comparisons between the results obtained by the present analytical method and the existing numerical solutions are described by figures. The orthogonal relation for the system of double-layered ground with vertical drains is proven. Finally, some consolidation properties of double-layered ground with vertical drains are analysed. Copyright

采用溶质运移的一维迁移模型，研究了粘土环境岩土工程特性对衬里防渗性能的影响，对目前采用的填埋场粘土类衬里防渗设计标准及其有效性进行了多参数组合的计算分析；此外，还比较了粘土衬垫与复合衬垫对污染物离子的防渗阻隔性能，对土工膜在衬垫中的作用进行分析；研究表明，应针对不同地区的情况（干旱少雨或多雨等）考虑衬垫的形式。与其他因素相比，粘土的渗透系数对衬垫层渗漏影响最大，以水力渗透系数作为填埋场粘土衬垫的设计标准是可行的，但离子扩散系数的影响也不可忽略；而增强粘土的活性，提高粘土吸附离子的性能，则可以延长离子通过衬垫的击穿时间；与单纯的粘土衬垫相比，复合衬垫对离子具有更好的阻隔性能，故在南方多雨地区宜采用复合衬垫；而用污染物的渗漏总量作为填埋场衬垫的设计标准比击穿时间更合理。