摘要
【目的】为减轻裂隙对膨胀土边坡的危害程度,需要对坡度变化对膨胀土边坡的裂隙演变的影响进行研究。【方法】本研究通过制作1∶0.5、1∶1、1∶1.5和1∶2四组不同坡比的边坡进行干湿循环试验,并使用图像处理技术提取裂隙率、裂隙宽度、裂隙长度等裂隙特征参数进行分析总结。【结果】结果表明:通过对六项主要裂隙试验指标进行主成分分析,综合得出坡比为1∶2的边坡裂隙发育情况最为恶劣,而坡比为1∶1的边坡裂隙发育情况最为安全。【结论】1∶1的坡比在四组坡比中属于控制裂隙发育的一个适中点,有效控制了雨水入渗导致的土体含水率变化,又适量增加了土体自重侧应力,减少了危险裂隙的生成,限制了裂隙发育。
[Purposes]To reduce the damage degree of cracks to expansive soil slope,this paper studies the influence of slope change on crack evolution of expansive soil slope.[Methods]The dry-wet cycle test was carried out by making four groups of slopes with different slope ratios of 1∶0.5,1∶1,1∶1.5 and 1∶2,and the crack characteristic parameters such as crack rate,crack width and crack length were extracted by image processing technology.[Findings]The results show that through the principal component analysis of the six main crack test indexes,it is concluded that the slope crack development with slope ratio of 1∶2 is the worst,but the slope crack development with slope ratio of 1∶1 is the safest.[Conclusions]The slope ratio of 1∶1 is a moderate point to control the development of cracks in the four groups of slope ratio,which effectively controls the change of soil moisture content caused by rainwater infiltration,increases the self-weight stress of soil,reduces the formation of dangerous cracks,and limits the development of cracks.
作者
刘曙
王桂尧
LIU Shu;WANG Guiyao(School of Civil Engineering,Changsha University of Science and Technology,Changsha 410000,China;Beijing Jianda Road and Bridge Consulting Co.,Ltd.,Central China Design Branch,Changsha 410000,China)
出处
《河南科技》
2023年第11期71-77,共7页
Henan Science and Technology
基金
长沙理工大学校级创新项目“坡度变化对晴雨交替膨胀土边坡的裂缝演变影响规律研究”(SJCX202120)。
关键词
坡度变化
膨胀土
裂隙
主成分分析
slope change
expansive soil
crack
the principal component analysis
