基于施工过程的路基水平位移特征分析

Study on the lateral displacements of soft soil foun-dation under embankment with stage construction

基于非线性有限元方法,对路堤各施工阶段路基体内水平位移的变化特性进行了考察,对比分析表明:在各施工阶段路基体内最大水平位移的位置并不是固定不变的,其随着填筑和固结阶段的不同而发生变化。最大水平位移的位置一般位于坡趾处竖向断面与坡中竖向断面之间的范围附近,故建议把测斜仪布置在该范围内(为了施工方便,可布置在坡中竖向断面或坡趾竖向断面处)。分析还表明,工程中通常采用的利用测斜仪来量测路基深部水平位移发展情况的技术存在一定的缺陷,故需发展更精密的仪器来考察路基水平位移的基本特性。

Based on nonlinear finite element method,the character of lateral displacement of soft soil foundation with stage construc- tion is analyzed.It is shown that the location of the maximal lateral displacement is changeable at different construction stages,which more likely lies in the vertical surface between the toe and the middle of slope of embankment.In order to get the maximal lateral dis- placement reasonably,it is suggested that the inclinometer pipes should be placed in the area between the toe and the middle of slope of embankment.It is also shown that the lateral displacement can not be measured conveniently with inclinometer pipe,although which has been used in engineering widely,for there are many shortcomings within this technique.So,the technique and instrument should be improved to measure lateral displacement accurately.