地震荷载作用下土工格室挡墙力学性能的影响因素  

Influence Factors of Mechanical Properties of Geocell Retaining Wall Under Seismic Load

作　　者：靳飞飞 宋飞[1,2] 石磊 朱婕[1,2] JIN Feifei;SONG Fei;SHI Lei;ZHU Jie(School of Highway Engineering,Chang’an University,Xi’an 710064,Shaanxi,China;The Key Laboratory of lntelligent Construction and Maintenance of CAAC,Chang’an University,Xi’an 710064,Shaanxi,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]长安大学民航机场智慧建造与维养重点实验室,陕西西安710064

出　　处：《华南理工大学学报（自然科学版）》2024年第7期145-160,共16页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(52278328);中建新疆建工科技研发课题(65000022859700210197)。

摘　　要：借助FLAC3D软件,建立土工格室柔性挡墙支护边坡数值模型,并采用振动台试验结果对数值模型进行验证,采用标定后的数值模型,系统研究了条带刚度、格室尺寸、挡墙厚度和充填料弹性模量4种因素对边坡动力响应的影响,并对挡墙的破坏机理进行了深入探讨,计算了各参数的影响权重。研究结果表明:地震作用下挡墙的稳定性与4种因素有着密切的联系;格室约束围压和永久水平位移沿高程分布规律基本一致,均表现为“增加-衰减”的两段形态,坡顶沉降自墙面向坡体延伸表现为两头小中间大的“V”型分布,水平峰值加速度沿高程表现为“增加-衰减-增加”的3段形态;随着刚度的增加,格室约束围压增大,而永久水平位移、坡顶沉降和水平峰值加速度均减小;随着格室尺寸的增加,格室约束围压、永久水平位移、坡顶沉降和水平峰值加速度均增加;随着挡墙厚度和充填料弹性模量的增加,格室约束围压、永久水平位移、坡顶沉降和水平峰值加速度均减小;4种影响因素中,格室尺寸影响权重最大,对格室约束围压的影响权重达到0.996,而挡墙厚度影响权重最小;地震作用下土工格室挡墙结构具有良好的抗震性能,挡墙结构对于地震能量具有一定的衰减作用,满足抗震设防要求。该研究结果对于地震作用下土工格室柔性挡墙的抗震设计及工程应用具有一定的指导作用。This paper established a numerical model of geotechnical flexible retaining wall supporting slope with FLAC3D software,and the model was verified by the results of shaking table tests.With the calibrated numerical model,it systematically studied the influence of four factors on the dynamic response of slope,including strip stiff-ness,cell size,retaining wall thickness and filling elastic modulus.Additionally,it discussed the failure mechanism of the retaining wall and calculated the influence weights of each parameter.The results indicate that the stability of a retaining wall under earthquake action is closely related to these four factors.The distribution law of confining pressure and permanent horizontal displacement along elevation follows a two-stage pattern of“increase-attenuation”.Furthermore,settlement at the top of the slope presents a“V”shape distribution with smaller ends and larger middle portions.The horizontal peak acceleration exhibits a three-stage pattern of“increase-attenuation-increase”along elevation.With the increase of stiffness,the confining pressure of the cell increases,but the permanent horizontal displacement,slope roof settlement and horizontal peak acceleration decrease.With the increase of cell size,cell confining pressure,permanent horizontal displacement,slope top settlement and horizontal peak acceleration increase.With the increase of retaining wall thickness and filling elastic modulus,cell confining pressure,perma-nent horizontal displacement,slope top settlement and horizontal peak acceleration all decrease.Among the four influ-encing factors,the influence weight of cell size is the largest,and the influence weight on cell confining pressure is 0.996,while the influence weight of retaining wall thickness is the least.The retaining wall structure of geocele has good seismic performance under earthquake action,and the retaining wall structure has a certain attenuation effect on seismic energy,which can meet the requirements of seismic fortification.The research resul

关 键 词：地震作用 土工格室挡墙 格室参数 动力响应 影响权重 破坏机理 

分 类 号：X703.1[环境科学与工程—环境工程]