不同降雨次数下膨胀土边坡裂隙演化试验研究  

Experimental Study on Fissure Evolution of ExpansiveSoil Slope under Different Rainfall Frequencies

作　　者：刘绍圳 王桂尧 LIU Shaozhen;WANG Guiyao

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《重庆建筑》2025年第4期80-84,共5页Chongqing Architecture

摘　　要：为研究不同坡度膨胀土边坡降雨与表面裂隙发展的关系,以湖南省长沙市某地膨胀土为例,模拟自然环境光照模式,开展雨-晴循环试验,分析不同降雨次数下雨水入渗行为与裂隙率变化的关系。结果表明:裂隙率随循环次数逐步增长,但增长幅度逐渐减小,第2次降雨入渗能力及脱湿阶段裂隙增长幅度均达到最大;1:2边坡入渗能力和裂隙发育高于1:1边坡;雨-晴循环过程中裂隙无法完全闭合,裂隙网络呈现较高相似性;1:2边坡在第2次降雨后坡脚发生局部破坏,1:1边坡裂隙随降雨逐次从坡脚向坡顶扩展,最终导致整体滑坡。To investigate the relationship between rainfall and surface fissure development on expansive soil slopes with varying gradients,an expansive soil sample from a location in Changsha City,Hunan Province,was used to simulate natural light exposure conditions.Rainfall-clear weather cycle tests were conducted to analyze the relationship between rainwater infiltration behavior and fissure rate changes under different rainfall frequencies.The results indicate that the fissure rate gradually increases with the number of cycles,but the growth rate decreases over time.The second rainfall event exhibits the maximum infiltration capacity and the highest fissure growth rate during the drying phase.The infiltration capacity and fissure development are more pronounced on 1:2 slopes compared to 1:1 slopes.Fissures do not fully close during the rainfall-clear weather cycle,and the fissure network exhibits high similarity.Local failure occurs at the slope toe of the 1:2 slope after the second rainfall event,while fissures on the 1:1 slope gradually expand from the slope toe to the slope crest with each rainfall event,ultimately leading to overall landslide.

关 键 词：膨胀土边坡 坡度 降雨入渗 裂隙演化 边坡稳定性 

分 类 号：U416.167[交通运输工程—道路与铁道工程]