深厚软土地基桩筏基础筏板厚度承载特性试验  

Bearing Characteristics Test of Pile-Raft Foundation Raft Thickness in Deep Soft Soil Foundation

作　　者：舒志乐[1] 刘智宇 陈昱东 SHU Zhi-le;LIU Zhi-yu;CHEN Yu-dong(College of Emergency Science,Xihua University,Chengdu 610039,China;Sichuan Provincial Architectural Design and Research Institute Co.,Ltd.,Chengdu 610000,China)

机构地区：[1]西华大学应急学院,成都610039 [2]四川省建筑设计研究院有限公司,成都610000

出　　处：《科学技术与工程》2021年第13期5453-5459,共7页Science Technology and Engineering

基　　金：四川省科技厅重点研发项目(2018GZ0514)。

摘　　要：为了获取内陆深厚软土地区桩筏基础复合地基承载特性,通过几何相似比为1︰10的物理模型试验研究和数值模拟,在试验中对基础的沉降、土压力、筏板内力及桩顶反力等数据进行采集,研究了不同工况下内陆深厚软土地基桩筏基础不同筏板厚度的承载变形特征。结果表明:桩筏基础的沉降分为3个阶段:线性阶段、非线性阶段和破坏阶段;加大筏板厚度对于筏板相对刚度具有较大影响,筏板相对刚度处于刚性状态时加大筏板厚度能有效降低总体沉降,并减少差异沉降;加大筏板厚度后,筏板和板下土体更多地承担了荷载;板下地基反力呈现四周大、中心小的趋势。In order to obtain the bearing characteristics of piled raft foundation composite foundation in inland deep soft soil area,through physical model test and numerical simulation with a geometric similarity ratio of 1︰10,the settlement of the foundation,earth pressure,internal force of the raft and pile top reaction force and other data were collected,and the bearing deformation characteristics of the piled raft foundation of inland deep soft soil under different working conditions were studied.The results show that the settlement of piled raft foundation is divided into three stages:linear stage,nonlinear stage and failure stage.Increasing the thickness of raft has a great influence on the relative stiffness of raft.When the relative stiffness of raft is in a rigid state,increasing the thickness of raft can effectively reduce the overall settlement and reduce the differential settlement.After increasing the thickness of raft,the raft and the soil under the slab bear more loads.The foundation reaction force under the slab shows a trend of big around and small center.

关 键 词：桩筏基础 深厚软土地基 承载特性 模型试验 

分 类 号：TU473.1[建筑科学—结构工程]