垛式新型悬臂式挡墙的数值分析及应用探讨  

DISCUSSION ON NUMERICAL ANALYSIS AND APPLICATION OF NEW STRUCTURE OF CANTILEVER RETAINING WALL

作　　者：梁波[1] 王家东[1] 严松宏[2] 

机构地区：[1]重庆交通学院土木建筑学院,重庆400074 [2]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《岩石力学与工程学报》2006年第z1期3174-3180,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：铁道部科技开发计划资助项目(2001G001-A-01)

摘　　要：悬臂式挡土墙轻型、柔性的力学特点使其具有适应交替变形的优点,但对其高度有一定的限制。对如何既利用悬臂式挡墙较高的抗倾覆能力和抗滑特性,又能在充分利用墙后填土的自重的前提下提高其支挡的高度,提出了多级垛式悬臂式挡墙这一新结构,并对其进行了探索和讨论。从探索悬臂式挡墙新的构成形式出发,首次提出二级垛式悬臂式支挡结构,并通过数值分析研究其受力变形特点。根据模拟的施工工况,采用弹塑性本构模型并考虑能够反映土体与墙面相互作用的接触单元,分析了墙背变形和填土的受力。此外,通过其力学特点分析和青藏铁路试验段的变形测试结果,探讨其在多年冻土地区的应用,以期为工程应用提供参考依据。The light and soft behaviors of the cantilever retaining wall have the characteristics to be adapted to the alternant deformation,but its height is limited.How to utilize its higher ability of safety against overturning and against sliding and self-weight of backfill to improve its height at the same time is a new issue.So a new structure of more-step cantilever retaining wall is studied.Starting from the new structure of cantilever retaining wall,two-step cantilever retaining wall is brought forth.Deformations of retaining back and stresses of backfill have been analyzed by elastoplastic numerical calculation model to simulate construction conditions.The boundaries between backfill and retaining wall,and backfill and floor are simulated by interface elements aiming at reflect interaction of them.In addition,along with the analysis of the mechanical behavior of the cantilever retaining wall and deformation test results from Qinghai—Tibet Railway,its application as a new retaining structure in permafrost regions is discussed.All these work can provide references to future engineering practice.

关 键 词：岩土力学 新型结构 悬臂式挡墙 数值分析 变形测试 多年冻土 

分 类 号：TU45[建筑科学—岩土工程]