浸水条件下膨胀土路堑边坡的稳定性分析  

Analysis of Stability of Expansive Soil Cutting Slope in Soaking Condition

作　　者：龚文惠[1] 王元汉[1] 郑俊杰[1] 

机构地区：[1]华中科技大学土木工程与力学学院华中科技大学控制结构湖北省重点实验室,武汉市430074

出　　处：《公路》2007年第10期96-100,共5页Highway

基　　金：湖北省自然科学基金资助项目(2005ABA303)

摘　　要：降雨后土体浸湿是造成膨胀土路堑边坡破坏的重要原因。通过分析浸水条件下膨胀土路堑边坡的破坏机理,考虑膨胀力作用的特点,建立了膨胀土路堑边坡的膨胀力作用模型。结合实际膨胀土路堑边坡工程,利用有限元法,模拟分析了边坡在浸水前后及不同浸水深度时的位移场、危险滑动面和稳定系数。通过分析和比较表明:膨胀土路堑边坡的稳定性直接受浸水条件的影响,浸水后的边坡不仅安全性明显降低,而且破坏具有明显的浅层性特征,故应做好坡面的防护和防水、排水措施。Soil soaking after rainfall is the important factor that causes the destruction of expansive soil cutting slope. Through the analysis of the slide mechanism of expansive soil cutting slope in the soaking condition, the characteristics of expansive force is taken into account, and the expansive force model of expansive soil cutting slope is established. By use of the finite element method, the displacement field, dangerous slide face and stability coefficient of an actual expansive soil cutting slope before-and-after soaking and with different soaking depth are simulated. The analysis and comparison indicate that the stability of the expansive soil cutting slope is directly affected by soaking condition. After soaking, the safety of the slope debased obviously, and its destruction had remarkable superficial chara-cteristics, so the protecting, waterproofing and draining measures for the slope surfaces are necessary.

关 键 词：膨胀土 路堑边坡 稳定性 膨胀力 有限元 

分 类 号：U416.1[交通运输工程—道路与铁道工程]