山区拓宽公路挡土墙路基的受力与变形特征分析  

Loading and deformation characteristics of highway widened subgrade with retaining wall in mountainous region

作　　者：万智 邓宗伟[1] 刘宝琛[1] 吴亚中 

机构地区：[1]中南大学土木建筑学院 [2]湖南省交通厅,长沙410011

出　　处：《岩土力学》2007年第5期921-926,938,共7页Rock and Soil Mechanics

基　　金：交通部西部交通建设科技项目(No.200331878528)

摘　　要：采用数值计算方法,分析了山区拓宽改造公路挡土墙路基的受力与变形特征。有限元分析结果表明,山区公路填方拓宽工程中,路基顶面沉降曲线呈“勺子”形状,区别于新建公路的抛物线形沉降曲线;与一般公路路基拓宽工程不同,山区拓宽公路不仅要重视新老路基结合部位的处治,新路基与挡墙结合部位的处治也不能忽视;山区公路填方拓宽路基外侧挡墙土压力的分布基本呈抛物线形状,不同于经典土压力理论得出的三角形土压力分布形式。通过分析路基拓宽宽度、老路路堤边坡坡度、新老路基路基材料性能等因素对路基受力的影响,揭示了山区拓宽改造公路新老路基不协调变形及挡墙的受力与变形特征规律。By the FEM numerical method, the characteristics of loading and deformation in widened highway subgrades with retaining wall in mountainous areas are discussed. The results by FEM show that in the subgrade-widening project in mountainous area, settlement curve of the subgrade features the shape of scoop; in contrast with the one in the shape of parabola in new-built highway; not only the treatment of jointed section between new and old highway subgrades, which is the key task in normal widened highway subgrade, but also the treatment of jointed section between new highway subgrade and retaining wall should be stressed in the subgrade-widening project in mountainous area; the lateral earth pressure distribution of retaining wall exhibits nearly a parabolic curve, different from the triangle form by classical earth pressure distribution theory. The analyses on the effects of the widened extent, the slope of old embankments and the different characteristics between the old and new materials of subgrades, reveal the rule of uncoordinated deformation between the new and old subgrades, and the characteristics of the lateral earth pressure distribution of retaining wall.

关 键 词：山区公路 拓宽 路基 挡土墙 不协调变形 受力与变形特征 

分 类 号：TU433[建筑科学—岩土工程]