摘要
针对某古滑坡堆积体中典型的X、Y状裂隙开展室内物理模拟试验,研究体积含水率、孔隙水压力、基质吸力及湿润锋运移形态的变化,探讨X、Y状裂隙在降雨入渗过程中的差异性影响。结果表明,X、Y状裂隙在降雨入渗中形成明显的雨水优势流效应,隙底的暂态饱和区促使同期入渗速率比周围均质土体更快;X状裂隙在堆积体的中上部入渗速度快于Y状裂隙,而在底部入渗速度不及Y状裂隙,且Y状裂隙堆积体渗流特性变化程度更高;X、Y状裂隙降雨入渗可划分为强烈入渗阶段和稳定入渗阶段,但存在显著差异:X状裂隙下渗次于侧渗,Y状裂隙下渗强于侧渗。
Aiming at the typical X and Y-shaped cracks in an ancient landslide deposit,the laboratory physical simulation test is carried out to study the changes of volumetric moisture content,pore water pressure,matrix suction and wetting front migration for discussing the different influence of X and Y cracks in rainfall infiltration.The results show that,(a)the X and Y-shaped cracks form an obvious dominant flow effect in rainfall infiltration,and the transient saturation zone at the bottom of the cracks causes the infiltration rate to be faster than the surrounding homogeneous soil;(b)the infiltration rate of X-shaped crack in the middle and upper part of the deposit is faster than Y-shaped crack,while in the bottom,which is slower than Y-shaped crack,and the seepage characteristics of Y-shaped crack deposit changes more;and(c)the rainfall infiltration of X and Y-shaped can be divided into strong infiltration stage and stable infiltration stage,but there are significant differences,in which,the downward infiltration of X-shaped crack is secondary to the lateral infiltration and the downward infiltration of Y-shaped crack is stronger than the lateral infiltration.
作者
钱昭宇
涂国祥
赵石力
李明
QIAN Zhaoyu;TU Guoxiang;ZHAO Shili;LI Ming(Chengdu University of Technology,Chengdu 610059,Sichuan,China;State Key Laboratory of Geohazards Prevention and Geoenviroment Protection,Chengdu 610059,Sichuan,China)
出处
《水力发电》
北大核心
2020年第8期92-98,共7页
Water Power
基金
国家自然科学基金资助项目(41472274)。
关键词
降雨入渗
裂隙
渗流特性
入渗阶段
湿润锋
rainfall infiltration
cracks
seepage characteristics
infiltration stage
wetting front
