模拟降雨条件下黄土边坡表面破坏试验研究  

Experimental study on surface failure of loess slope under simulated rainfall conditions

作　　者：董振国 DONG Zhen-guo(Yangling Vocational and Technical College,Yangling,Shaanxi,712100)

机构地区：[1]杨凌职业技术学院,陕西杨凌712100

出　　处：《地下水》2023年第2期236-238,共3页Ground water

基　　金：杨凌职业技术学院2021年院内基金项目:“黄土边坡两种防护材料防护效应差异性研究”(ZK21-40)。

摘　　要：本文通过室内模型试验对黄土边坡的表面破坏特征进行研究。试验表明连续降雨对黄土边坡的危害较大,连续降雨与单次降雨相比坡面径流的初试时间更早,水分入渗深度更深;但两种类型的降雨条件下水分入渗的速率在降雨结束4小时内均会急剧下降,此后趋缓。试验还表明坡比对黄土边坡冲刷破坏的影响具有双重性,坡比未达临界值时坡比与径流量成正比,超过临界值则反之。此外,本文还提出雨水对黄土边坡的侵蚀作用主要可分为雨水冲击、吸水软化以及流水切割三种机制。In this paper,the surface failure characteristics of loess slope were studied by laboratory model tests.The results show that continuous rainfall has great harm to the loess slope.Compared with single rainfall,the initial test time of slope runoff is earlier and the depth of water infiltration is deeper.However,under the two types of rainfall conditions,the rate of water infiltration decreased sharply within 4 hours after the end of rainfall,and then slowed down.The experiment also shows that the influence of slope ratio on the erosion failure of loess slope has dual character.When the slope ratio is not up to the critical value,the slope ratio is directly proportional to the runoff,and vice versa when the slope ratio is over the critical value.In addition,the erosion effect of rainwater on loess slope can be divided into three mechanisms:rainwater impact,water absorption softening and water flow cutting.

关 键 词：黄土边坡 模拟降雨 坡比 冲刷破坏 

分 类 号：P642.131[天文地球—工程地质学]