中文摘要：

针对路基湿化过程中抗剪强度降低问题，基于非饱和土力学渗流理论，提出了采用毛细阻滞层降低路基沉降的方法。采用数值模拟方法，对比分析了在湿润气候的极端降雨条件下，传统路基和含有毛细阻滞层的路基强度、变形和安全系数的变化。结果表明在湿润气候下，毛细阻滞层仍能有效地减少降雨对路基内孔隙水压力分布的影响，从而减少路面变形，提高路基的稳定性。

英文摘要：

Based on the seepage theory for unsaturated soils, capillary barrier technology is pro- posed to protect the unsaturated subgrade from differential settlement and instability subjected to wet- ting. To evaluate the feasibility of this technology in subgrade located in humid climate, a numerical simu- lation using Geo-Studio is conducted to compare the pore-water pressure, water content, settlement and safety factor of subgarde with and without capillary barrier upon extreme wetting condition of humid zone of China. The results show that the capillary barrier can impede the invasion of rainfall under the extreme wetting condition so as to maintain the original magnitude of pore-water pressure in subgrade,leading to a significant decrease of the settlement of subgrade.