不同降雨条件下非饱和土边坡稳定性分析  

Stability Analysis of Unsaturated Soil Slopes under Several Conditions of Rainfall

作　　者：李振嵩[1] 吉彬彬[1] 曾伟国[1] 陈海新[1] 

机构地区：[1]中水珠江规划勘测设计有限公司,广东广州510610

出　　处：《广东水利水电》2014年第11期21-29,共9页Guangdong Water Resources and Hydropower

摘　　要：针对广东某高速路堑边坡,研究不同降雨强度、历时以及不同坡面入渗量对边坡稳定性的影响。研究表明:当雨强越接近土体的饱和渗透系数时,边坡的安全系数越小;当雨强小于土体的饱和渗透系数时,长历时的降雨对边坡稳定性的影响小;等强型降雨条件下,非饱和土边坡在降雨结束后1 3 d安全系数达到最小。加固后的路堑边坡应强化并保持坡面阻水能力,否则可能出现非加固区浅表层滑塌。Aimed at the analysis of some road slopes caused by the building of some Guangdong freeway,several factors on the unsaturated soil slopes stability have been studied,such as： rainfall intensity,rainfall duration and slope surface infiltration quantity,and it is concluded that： the closer is the rainfall intensity with the soil＇s saturated coefficient of permeability,the smaller is the slope＇s safety factor; when the rainfall intensity is far smaller than soil＇s saturated coefficient of permeability,the long time rainfall＇s influence on slope stability is faint; when the rainfall is uniform,the slope＇s safety factor will get minimum 1 - 3 days after rainfall. Unsaturated soil slopes after excavating should be reinforced on the slope surface for waterproof,otherwise some shallow slide will happen at the unreinforced area.

关 键 词：非饱和土 土水特征曲线 雨型 入渗量 安全系数 

分 类 号：TU432[建筑科学—岩土工程]