不同浸水时间的黄河下游堤防稳定性研究  

Study on Stability of Embankments in Different Immersed Duration of the Lower Yellow River

作　　者：赵宇坤[1] 李庆安 任丽元 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]山东黄河勘测设计研究院,山东济南250013

出　　处：《人民黄河》2008年第1期13-14,共2页Yellow River

基　　金：河南省创新人才基金资助项目(HNCX200108);国家自然科学基金资助项目(40602034)

摘　　要：对不同浸水时间的黄河下游堤防堤身土体的强度指标进行了直接快剪和不固结不排水三轴剪切试验,结果表明:①土体的黏聚力随浸泡时间的增长大幅度下降,浸泡5 d后,壤土的最大降幅为72.6%,沙壤土的最大降幅为62.8%,而土体的内摩擦角变化较小;②在经过洪水的长时间浸泡之后,堤防的稳定性大大降低,且浸泡时间越长降幅越大,洪水浸泡1 d后堤防稳定安全系数降低36.2%,浸泡5 d后稳定安全系数降低58.2%。It conducts direct rapid shear and non-consolidation and non-drainage triaxial shearing tests on intensity index of embankment soil of the lower Yellow River with different immersion time.The outcomes show that a) the adhesion of the soil mass is greatly reduced along with the increase of immersed time.After immersing 5 days,the maximum reduction of loam is 72.6%,sandy loam 62.8% and the variation of angle of internal friction of the soil mass smaller;b) after long time immersion,the stability of embankments is greatly reduced and the longer immersed time the greater reduction.After immersing 1 day,the safety factor of embankment stability is reduced by 36.2% and by 58.2% after immersing 5 days.

关 键 词：稳定性评价 黏聚力 土体参数 浸水土体 堤防 黄河下游 

分 类 号：TV871[水利工程—水利水电工程] TV882.1