基于降雨模型试验的砂土边坡侵蚀作用分析  

Analysis on Erosion Effect of Sand Slope Based on Rainfall Model Test

作　　者：段荣丰 文登国 DUAN Rongfeng;WEN Dengguo(Southwest Municipal Engineering Design&Research Institute of China,Chengdu 610036,China)

机构地区：[1]中国市政工程西南设计研究总院有限公司,成都610036

出　　处：《路基工程》2025年第2期108-113,共6页Subgrade Engineering

摘　　要：研发能够模拟下落雨滴冲击力、速度和动能的新装置,并通过激光粒度分析仪表征径流中沉积物的尺寸,进行室内降雨模型试验分析。结果表明:土体水分变化与土体吸力之间具有良好的响应,即土体含水量的降低增加了土体吸力;随着渗透性降低,土体表面更加密实,从而影响降雨作用下的冲击力、径流和土体流失量;在控制土体吸力试验中,小尺寸土体颗粒从土体表面脱落;当不产生径流时,土体吸力占主导地位,不会随着降雨的持续而突然消失。The indoor rainfall model test was analyzed in such a way that a new device was developed to simulate the impact force,velocity and kinetic energy of falling raindrops and a laser particle size analyzer was adopted to characterize the size of sediment in runoff.The result shows that,there is an active response between soil moisture change and soil suction,that is,the decrease of soil moisture content increases soil suction;as the permeability decreases,the soil surface becomes denser,which affects the impact force,runoff and soil loss under rainfall.In the control soil suction test,smallsized soil particles fall off from the soil surface;when runoff is not generated,soil suction dominates and does not suddenly disappear with the continuation of rainfall.

关 键 词：降雨 侵蚀 模型试验 冲击力 吸力 

分 类 号：S157.1[农业科学—土壤学]