路堤软土地基变形性状模型试验研究

通过室内模型试验对路堤下软土地基的变形特性进行研究 ,探讨了软土层的厚度、荷载大小和加荷速率以及软土层的倾斜等因素对软土地基的侧向变形和竖向变形的影响。试验结果的分析得出了一些有工程实践意义的结论 ,例如 ,试验表明荷载作用下均质软土地基的最大侧向位移一般发生在软土厚度的 0 .2～ 0 .3倍深度处 ,因而施工中以地表观测桩观测的侧向位移来控制施工过程的稳定性的做法值得商榷 ;软土地基发生早期破坏时 ,仍然能承受较大的外加荷载 ,对周围土体的强度提高有利 ,为在软土地基上进行“促动法”施工提供了依据

Research on Deformation Behavior in Soft-Soil Foundation Under Embankment by Laboratory Model Test

The deformation behaviors of soft soil under embankment by laboratory model test are studied in this paper. In the tests we mainly considered a few factors, such as depth of soft soil, the magnitude and rate of loading , and its slope angle etc, which affected the lateral and vertical deformation of soft soil foundation. From the analysis of test results we get some conclusions that have engineering meanings. For example, the maximum lateral deformation of homogeneous soft soil appeared in 0.2~0.3 depth underground. So, we consider that the method, which depends on the lateral deformation values of surface observation pile to control the stability of soft soil foundation during construction, is unreasonable. The test also indicated that the soft soil foundation could still support larger load after the initial failure of soft soil foundation occurred. That offers the basis of the construction of "Impelling Failure Method" in soft soil foundation.