砌石挡土墙稳定性的模型试验及数值模拟  

Model Test and Numerical Simulation of Stability of Masonry Retaining Wall

作　　者：毕继红[1,2] 袁琳琳 赵云 霍琳颖 Bi Jihong;Yuan Linlin;Zhao Yun;Huo Linying(School of Civil Engineering,Tianjin University,Tianjin 300050,China;Key Laboratory of Coast Civil Structure Safety,Ministry of Education,Tianjin 300072,China)

机构地区：[1]天津大学建筑工程学院,天津300050 [2]滨海土木工程结构与安全教育部重点实验室,天津300072

出　　处：《石家庄铁道大学学报（自然科学版）》2020年第2期16-23,共8页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：国家科技支撑计划(2009G09-1-7)。

摘　　要：利用数值计算软件对挡土墙稳定性进行数值模拟分析是研究挡土墙在不同荷载作用下响应的重要手段之一。以模型试验中砌石挡土墙的尺寸为基准,采用分析软件ABAQUS建立砌石挡土墙的二维和三维有限元模型。在模型中,背后填土采用Mohr-Coulomb弹塑性本构,同时在挡土墙及背后土体的多个关键位置设置接触,以考虑各部分之间的相互作用。为验证模型的有效性,对某公路挡土墙结构进行拟静态的倾斜试验,以相同的加载条件对有限元模型进行模拟分析。研究结果表明,挡土墙墙面缺乏整体性,同时墙后砾石下沉,最终导致墙体发生坍塌破坏;数值模拟和模型试验结果的对比分析,证明提出的有限元模型模拟挡土墙倾斜过程的合理性;相比于三维模型,二维模型计算过程更加稳定,为后续挡土墙的抗震计算分析奠定了基础。Numerical simulation analysis of retaining wall stability is one of the important methods to study the response of masonry retaining wall under different loads.Based on the size of retaining wall in model test,two-dimensional and three-dimensional finite element models of masonry retaining wall were established by ABAQUS.In the model,the backfill adopted the Mohr-Coulomb elastoplastic constitutive,and contacts were set at key locations of the retaining wall to consider interactions between various parts of the retaining wall.In order to verify the validity of the model,the retaining wall was subjected to the tilt test which simulated pseudo static condition,and the finite element model was simulated with the same loading conditions.Results show that because of the gravel sinking and the lack of integrity of the masonry retaining wall,the wall collapses eventually.The comparison of numerical simulation and model test results proves that the proposed finite element model can simulate the tilt loading process of the retaining wall.Compared with the three-dimensional model,the two-dimensional model improves computational stability,which lays the foundation for seismic calculation and reinforcement analysis of retaining walls.

关 键 词：砌石挡土墙 模型试验 接触 数值模拟 稳定性 

分 类 号：TU476.4[建筑科学—结构工程]