不同预压作用下软基侧向变形规律对比研究  

Comparative Study on Lateral Deformation Law of Soft Subgrade by Different Preloading Method

作　　者：扈胜霞[1,2] 崔保龙[1] 刘丽君[1] 

机构地区：[1]延安大学建筑工程学院,陕西延安716000 [2]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098

出　　处：《水利与建筑工程学报》2014年第3期80-84,共5页Journal of Water Resources and Architectural Engineering

基　　金：河海大学岩土力学与堤坝工程教育部重点实验室开放基金项目(GH201101);陕西省教育厅项目(12JK0922)

摘　　要：软土地基侧向变形会引起上部土体的水平位移,产生裂缝,引发道路开裂、路基失稳等工程问题。为了研究不同预压荷载作用下软土路基的侧向变形规律,分析了真空预压、堆载预压以及真空—堆载联合预压法加固软基时土体的应力、应变和侧向受力的不同。结合软基预压加固的实测资料,讨论了不同预压方式下土体的水平位移。得到了如下结论:在不同预压荷载作用下,土体的应力不同,应变路径不同,侧向所受应力也不同;预压加固断面实测的水平位移曲线表现出了与应力计算分析相同的现象;由于路基处理的隐蔽性,预压方法加固软土路基时,需建立科学的监测方法,进行信息化施工;不同的预压方法加固软基时,真空预压处理深厚软基的效果优于堆载预压。The lateral deformation of soft soil will cause the horizontal displacement of the upper part of the soil ,then cracks ,which will cause road cracking ,subgrade instability and other engineering problems .In order to study the lateral deformation law of the soft soil subgrade under different preloading load ,the stress ,strain and lateral force of the soft soil foundation under the vacuum preloading ,surcharge preloading and combined vacuum-surcharge preloading were ana-lyzed .Based on the observed data of the soft soil subgrade by preloading ,the horizontal displacement of the soft soil un-der different preloading was discussed .The conclusions are as follows ：The stress and the strain as well as the lateral stress of the soft soil is different under the different preloading load ;The horizontal displacement curves observed from preloading section show the same characteristics with the stress calculation analysis ;Due to the roadbed of concealment , when using the preloading method for the consolidation of soft soil subgrade ,the scientific monitoring techniques and in-formation construction are required ;When using different preloading method for the consolidation of soft foundation ,the treatment effect for deep soft foundation by vacuum preloading is better than that by surcharge preloading .

关 键 词：预压荷载 侧向变形 水平位移 实测资料 

分 类 号：TU447[建筑科学—岩土工程]