降雨条件下公路边坡暂态饱和区发展规律  

Developing Law of Transient Saturated Areas of Highway Slope Under Rainfall Conditions

作　　者：付宏渊[1] 曾铃[1] 蒋中明[1] 何忠明[1] 

机构地区：[1]长沙理工大学岩土工程研究所,湖南长沙410004

出　　处：《中国公路学报》2012年第3期59-64,共6页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(51078042);湖南省交通科技计划项目(2009003);交通运输部西部交通建设科技项目(2009 318 000 048)

摘　　要：为了分析降雨对边坡稳定性的影响,结合工程实际情况,通过拟定不同的降雨计算方案,采用饱和非饱和渗流理论对某高速公路边坡暂态饱和区的发展变化和地下水升降情况进行数值模拟,进而深入研究边坡在降雨过程中地下水位和暂态饱和区的变化规律以及暂态饱和区对边坡稳定性的影响。研究结果表明:降雨强度决定了饱和区形成的时间,而暂态饱和区扩展面积的大小则受到降雨历时和降雨强度共同影响,暂态饱和区形成和消散都具有滞后特点;降雨不会迅速引起边坡中地下水位的大幅度上升;初始地下水位的高低对暂态饱和区出现的时间和扩展范围将产生重要影响。In order to analyze the effect of rainfall on slope stability, according to the actual situation of engineering and different calculation schemes that were worked out, the authors simulated the change of groundwater table and transient saturated area in the slope under rainfall condition, with the application of saturated and unsaturated seepage theory. The authors made a deep study on the influence of change of groundwater table and transient saturated area in slope on slope stability during raining process. The results show that the formation time of transient saturated area depends on the rainfall intensity, while the development extent of transient saturated area is influenced by both rainfall duration and rainfall intensity, the formation and dissipation of transient saturated area are lagging. The rainfall can not result in a large degree of continuous increasing of the groundwater table rapidly, and the level of the initial groundwater table will have great effect on the formation time and the development extent of transient saturated area.

关 键 词：道路工程 公路边坡 饱和非饱和渗流理论 降雨过程 暂态饱和区 地下水位 

分 类 号：U416.14[交通运输工程—道路与铁道工程]