桩承式加筋路堤研究综述

Research Advances of Basal Reinforced and Pile Supported Embankments

在软土地基上进行路堤工程建设,主要面临稳定性和变形2方面的问题,桩承式加筋路堤不仅能够提高路堤的稳定性,而且能够控制路基的沉降。通过一系列室内模型试验、现场原型监测和数值分析,人们对桩承式加筋路堤中的土拱效应和加筋拉膜效应,以及路堤荷载传递机制已形成比较一致的看法,并在各种土拱模型理论指导下形成多种桩承式加筋路堤设计方法。但目前对桩承式加筋路堤的土拱形态和成拱条件认识不一致,重复荷载下土拱效应演变规律缺乏定量研究,现行设计方法对路堤沉降控制仍显不足。在综述桩承式加筋路堤已有研究成果的基础上,重点论述桩承式加筋路堤的作用机理理论与应用研究的成果,提出了对存在问题做进一步研究的建议。

Stability and deformation are main issues of embankment construction on soft soils.The techniques of basal reinforcement and pile support could enhance the embankment stability and control the subgrade settlement.Through laboratory model tests,prototype monitoring and numerical modeling,researches on the soil arching effect and reinforcement tensioned membrane effect as well as the load transfer mechanism have been in consistency.A variety of design methods of GRPS （Geosynthetic-reinforced and Pile-supported） embankments have come into being.However,researches on the arching shape and the conditions of arching development have not reached an agreement.Quantitative studies on the variation regularity of arching effect under repeated loading are in lack.The control of embankment settlement hasn＇ t received sufficient attention in current design specifications.On the basis of previous research achievements,the mechanism and application of GRPS embankments are expounded,and suggestions for further researches are put forward.