预应力挡土墙工作性能研究  

Research on Working Properties of Pre-Stressed Retaining Wall

作　　者：李栋 陈湘生[1] 安关峰[2] 陈仕文 Li Dong;Chen Xiangsheng;An Guanfeng;Chen Shiwen(College of Civil and Transportation Engineering,Shenzhen University,Shenzhen,Guangdong 518060,P.R.China;Guangzhou Municipal Group Co.,Ltd.,Guangzhou 510000,P.R.China;Zhuhai Institute of Urban Planning&Design,Zhuhai,Guangdong 519000,P.R.China)

机构地区：[1]深圳大学土木与交通工程学院,广东深圳518060 [2]广州市市政集团有限公司,广州510000 [3]珠海市规划设计研究院,广东珠海519000

出　　处：《地下空间与工程学报》2022年第6期1989-1995,共7页Chinese Journal of Underground Space and Engineering

基　　金：广东省住房和城乡建设厅科技计划项目(2020-K4-315671,2020-K4-534762);广州市建筑集团有限公司科技计划项目(BH20210315421);珠海市社会发展领域科技计划项目(ZH22036205200004PWC,ZH22036204200009PWC)。

摘　　要：为研究预应力挡土墙的工作性能,基于经过模型试验数据验证的数值建模方法,构建了一个6 m高的预应力挡土墙数值模型。通过与未施加预拉力的挡墙进行对比,分析了挡土墙的变形、土压力分布、主应力方向、屈服区发展、特征单元的应力路径和整体稳定性等规律。研究结果表明:预应力筋的预拉力能够有效减小挡土墙的变形,其侧向位移和竖向沉降分别减小了42.1%和32.5%;施加预拉力后,填料中土压力的大小和主应力方向发生显著变化,加固区整体性增强,墙后屈服区扩展范围减小;特征单元的应力路径变化规律和强度折减法稳定性计算结果均表明,施加预拉力后挡土墙的稳定性有所提高。In order to study the working performance of pre-stressed retaining wall, a 6 m high pre-stressed retaining wall numerical model was constructed based on the numerical modeling method verified by model test data. By comparing with the retaining wall without pre-pull force, the deformation, soil pressure distribution, principal stress direction, yield area development, stress path and overall stability of the characteristic element were investigated. The results show that: the pretension of pre-stressed reinforcement can effectively reduce the deformation of retaining wall, and its lateral displacement and vertical settlement are reduced by 42.1% and 32.5%, respectively. After pretension is applied, the magnitude of earth pressure and the direction of principal stress in the backfill change significantly, the integrity of the reinforced zone is enhanced, the range of yield zone behind the wall shrinks. The stress path variation law of the characteristic element and SRM stability calculation results indicate that the stability of retaining wall is improved after applying pretension.

关 键 词：预应力挡土墙 数值模拟 主应力方向 应力路径 屈服区 

分 类 号：TU470[建筑科学—结构工程]