加筋格宾挡墙的结构特性数值分析  

Numerical Analysis on the Structural Feature of Gabion Reinforced Earth Retaining wall

作　　者：王祥[1] 黄向京[1] 刘泽[2] 

机构地区：[1]湖南交通规划勘察设计院,湖南长沙410008 [2]湖南科技大学土木工程学院,湖南湘潭411201

出　　处：《公路工程》2014年第4期4-9,16,共7页Highway Engineering

基　　金：交通运输部联合攻关课题(2010-353-343-290);湖南省交通科研项目(200908);湖南省交通设计院科研项目(201201)

摘　　要：以FLAC3D为平台,建立了加筋格宾挡墙数值分析模型,研究了加筋格宾挡墙的土压力、挡墙变形、筋材拉应力等特征参数的分布规律,并分析了加筋间距、格宾箱宽和筋材长度对挡墙的影响。研究表明:加筋格宾挡墙的土压力分布规律与经典土压力理论的计算值有较大差异;直立面墙加筋格宾挡墙上部变形大,下部变形小,整体上呈向临空侧倾覆;筋材拉应力在筋长方向为非线性分布;随着加筋间距减小,挡墙的侧向变形减小,筋材受到的拉应力减小,但加筋间距分别为0.7、0.8、0.9 m时,墙内最大拉应力基本相同。加筋格宾挡墙的格宾箱面墙本身就相当于一座重力式挡土墙。随着格宾箱宽度增加,挡墙变形减小,筋材受到的拉应力也减小。随着筋材长度增加,挡墙侧向变形减小,但当筋长超过0.67倍墙高后,挡墙的侧向变形和筋材最大拉应力不再变化。Based on FLAC3D, a numerical model of reinforced gabion retaining wall has been built, the distribution lows of its earth pressure ,deformation,reinforcement tensile stress have been studied ,and the influence of reinforced spacing, gabion box width and reinforcement length to the retaining wall have been analyzed. Research shows that： the earth pressure distribution rule is different to the classical earth pressure theory calculation value; the deformation on theupper of wall is bigger than that on the lower; the tensile stress of geosynthetics distributes nonlinearly in the band long direction, with the reinforcement spacing decreases,the lateral deformation of retaining wall is reduced, the tensile stress of reinforcement decreased,but when the distance are respectively 0. 7 m ,0. 8 m,0. 9 m,the maximum tensile stress of re- inforcements is basically the same; the gabion box wall itself is the equivalent of a gravity retaining wall, and with gabion box width increases, the deformation of retaining wall and the tensile stress is re- duced. With the increase of reinforcement length, the lateral deflection of wall decreases, but when the band length is more than 0. 67 times of wall height, the lateral deformation of retaining wall and reinforced material maximum tensile stress changes no longer.

关 键 词：加筋格宾挡土墙 结构特性 筋材拉应力 数值分析 

分 类 号：U417.11[交通运输工程—道路与铁道工程]