摘要
以泾阳庙店滑坡为研究对象,在非饱和土特性试验基础上,结合野外地质调查结果建立典型斜坡的饱和-非饱和渗流模型,模拟渠道渗漏对于斜坡渗流场的影响,研究了渠道渗漏对于斜坡稳定性的影响。计算结果显示,渠道渗漏引起的水分入渗湿润锋面呈近似椭圆状增大,使得饱和区域面积逐渐增加;当入渗时间足够长时,地表水入渗开始补给地下水,原始补给排泄平衡遭到破坏、之后又逐渐形成新的平衡。在渠道水渗漏与地表水入渗优势通道共同作用下,斜坡稳定性系数随渗水时间的增长而逐渐减小。该地区滑坡发生的主要原因是长期农业灌溉过程中,渠道渗漏水体长时间入渗,改变了斜坡内部孔隙水压力与基质吸力,改变了斜坡的原有的渗流场,降低斜坡土体抗剪强度所致。
Based on the field geological investigation combined with the unsaturated soil characteristics test,the saturated-unsaturated seepage model of typical slope was established in the Miaodian landslide of Jingyang.The influence of channel seepage on slope seepage field was simulated,and the influence of channel seepage on slope stability was analyzed.The results showed that the infiltration wetting front caused by channel seepage increased approximately elliptically,and the saturated area caused by water infiltration increased gradually.With the increase of infiltration time,the supply of groundwater began from surface water infiltration,its original balance was destroyed and new balance was formed.Under the joint action of channel seepage and dominant channel of surface water infiltration,the stability of loess slope decreased with the seepage time.The reason for the landslide was mainly due to the long-time infiltration of channel seepage water during the long-term agricultural irrigation process,which changed the pore water pressure and matrix suction inside the slope and the seepage field of the slope,and reduced the shear strength of the slope soil.
作者
刘战峰
王家鼎
许元珺
谷天峰
LIU Zhan-feng;WANG Jia-ding;XU Yuan-jun;GU Tian-feng(State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi'an 710069,China)
出处
《土壤通报》
CAS
CSCD
北大核心
2020年第2期455-461,共7页
Chinese Journal of Soil Science
基金
国家重点研发计划项目(2018YFC1504703)
国家自然科学基金重点项目(41630639)资助。
关键词
庙店滑坡
渠道渗漏
斜坡渗流
数值模拟
The Miaodian landslide
Channel leakage
Advantage infiltration channel
Numerical simulation
