摘要
堆积体中的裂隙对降雨入渗有重要影响。对滑坡堆积体中两种常见的裂隙Y型裂隙和主次组合型羽状裂隙对降雨入渗的影响展开了物理模拟试验研究。通过对降雨过程中两种裂隙堆积体内孔隙水压力、体积含水率和基质吸力变化特征的分析,得出以下结论:①降雨在两种裂隙的的堆积体中的入渗过程大体相似,可概括为3阶段,即表面浸湿,裂缝处强烈下浸及扩散,水平侧向浸湿。②不同裂隙堆积体的降雨入渗机理第二阶差异明显,羽状裂隙扩散作用强于下浸,Y型裂隙扩散作用弱于下浸。③降雨易通过羽状裂隙入渗至堆积体深部,对堆积体稳定性影响大于Y型裂隙。
Cracks in deposit have important influences on rainfall infiltration.Influences of two types of cracks,Y-type cracks and the primary-secondary combined feather-like cracks,on rainfall infiltration of landslide deposits were studied by physical simulation experiment.Through analysis on the change characteristics of pore water pressure,volumetric water content and matrix suction of deposits with both types of cracks,the following findings could be obtained:(1)the raindrops infiltrated into the deposits with two types of cracks were in generally similar way,which can be summarized as 3 stages:surface wetting,strong immersion and diffusion at the cracks,horizontal and lateral wetting;(2)in Phase II,rainfall infiltration mechanisms of the two types of cracks varied greatly,namely the diffusion effect of feather-like crack was stronger than immersion effect,while the Y-shaped crack had a contrary phenomenon.(3)Raindrops were easy to immerse deep into the deposit through feather-like cracks,showing greater impact on the stability of the deposit than Y-shaped cracks.
作者
王清
涂国祥
赵石力
邱潇
WANG Qing;TU Guoxiang;ZHAO Shili;QIU Xiao(State Key Laboratory of Geo-hazard Prevention and Geo-environment Protection,Chengdu University of Technology,Chengdu 610059,China)
出处
《人民长江》
北大核心
2020年第11期179-184,共6页
Yangtze River
基金
国家自然科学基金项目“降雨在山谷型古冰水堆积体中非线性入渗过程及其对稳定性影响的时间效应”(41472274)。
关键词
降雨入渗
堆积体
裂隙发育
模型试验
湿润锋
rainfall infiltration
deposit
crack development
model test
wetting front
