摘要
结合工程实例,在假定极端冰雪边界条件及边坡岩体渗透特性条件下,采用饱和-非饱和渗流分析方法,研究了我国南方极端冰雪融水对边坡渗流场的影响。结果显示:融雪入渗将显著抬高边坡浅表部的压力水头,特别是缓坡地带及坡脚处可能出现范围较大的暂态饱和区。随着融雪水持续入渗,下部压力水头逐渐升高,自由面位置明显上升,但入渗结束后的一段时间内,坡体局部压力水头并无明显降低,且受上部入渗影响,压力水头甚至呈现继续升高的趋势。边坡深部渗流场受融雪入渗影响较小。
Using saturated-unsaturated seepage analytic method,we studied the influence of melted water produced by extreme ices now weather in southern China on slope seepage in the assumed boundary condition of extreme ice snow weather and slope permeability features.The results show that the infiltration of melting water can raise the water level in the surface and shallow part of the slope obviously,and especially,a large scale of temporary saturated areas may be found in slow slope and slope toe.With continuing infiltration of melting water,the water level of the lower part rises gradually,and so does the free surface.However,after the infiltration is finished,the water level of local slope body does not decrease.And by the infiltration of upper part,the water level shows a trend of rising continuingly.The seepage field in deeper part of the slope is rarely influenced by infiltration of the melting water.
出处
《人民长江》
北大核心
2010年第21期6-9,72,共5页
Yangtze River
基金
国家"十一五"科技支撑计划项目(2008BAC47B02)
关键词
边坡
渗流场
渗流分析
极端冰雪灾害
slope
seepage field
seepage analysis
extreme ice-snow weather in southern China
