冻融循环作用下加筋土挡墙温度场与变形特性研究  

Temperature field and deformation behaviors of geogrid-reinforced soil retaining wall under freeze-thaw cycles

作　　者：崔飞龙 肖成志[1] 王子寒 田稳苓[1] Cui Feilong;Xiao Chengzhi;Wang Zihan;Tian Wenling(Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]河北工业大学,天津300401

出　　处：《土木工程学报》2022年第8期105-117,共13页China Civil Engineering Journal

基　　金：国家自然科学基金(52078182,41877255)。

摘　　要：为了研究季冻区冻融循环作用下土工格栅加筋黏性土挡墙内部温度场与变形特性,通过开展室内缩尺模型试验并结合ABAQUS有限元数值分析,研究了冻融循环作用以及循环次数对加筋土挡墙内部温度场、顶部与面板变形的影响规律。研究结果表明:加筋土挡墙在-15℃低温和35℃高温的冻融循环作用下,环境温度对挡墙内温度场影响显著,影响范围约为距面板后0.3m和顶部表面以下0.4m区域内;挡墙竖向截面温度呈周期性变化,其变化规律几乎不受冻融循环次数影响,但温度变化的滞后性随深度增加明显增强;在-15℃低温作用下,挡墙顶部与面板发生明显冻胀变形,而在35℃高温作用下,挡墙顶部发生融沉现象且面板变形减小;挡墙顶部与面板变形主要发生在初次冻融过程中,随后在第2~5次冻融循环作用下波动幅度减小,研究结果将为季冻区加筋土挡墙设计提供参考。To investigate the temperature field and deformation behaviours of geogrid-reinforced soil(GRS)retaining wall backfilled with clay constructed in seasonally frozen area under the freeze-thaw cycles,the reduced scale physical model test of GRS retaining wall subjected to freeze-thaw cycles and ABAQUS finite element analysis were carried out,respectively.The effects of freeze-thaw cycles on the temperature field,vertical deformation at the top surface of GRS wall,and lateral deformation of facing panels were studied,respectively.The research results showed that when the GRS retaining wall was subjected to freeze-thaw cycles at the-15~35℃,the ambient temperature has a significant effect on the temperature field in GRS wall.Temperature field in the range of about 0.3 m behind the rear end of facing panels and about 0.4 m below the top surface of GRS wall model fluctuated obviously with the ambient temperature.The temperature along the vertical cross section of the retaining wall periodically changed which was almost not affected by the number of freeze-thaw cycles,and the hysteresis of temperature variation increased significantly with the increase of depth.When the GRS wall was maintained under-15℃,the top surface and facing panels of GRS wall exhibited significant frost heave deformation.At the temperature of 35℃,thaw settlement occurred at the top surface of GRS retaining walls and lateral deformation of facing panels decreased.The deformation at the top surface of GRS wall and lateral deformation of facing panels mainly occurred in the first freeze-thaw cycle,and then the changing amplitude decreased gradually from the 2 nd to 5 th freeze-thaw cycle.The research results provide a reference for the design of GRS retaining wall constructed in seasonally frozen area.

关 键 词：加筋土挡墙 冻融循环 模型试验 有限元 温度场 变形特性 

分 类 号：TU411.9[建筑科学—岩土工程]