有限宽度填土衡重式挡土墙主动土压力研究  

Active Earth Pressure of Narrow Backfill on Balance Weight Retaining Wall

作　　者：刘一心 熊传祥[1] LIU Yixin;XIONG Chuanxiang(Zijin school of Geology and Mining,Fuzhou University,Fuzhou,Fujian 350116,China)

机构地区：[1]福州大学紫金地质与矿业学院,福建福州350116

出　　处：《水利与建筑工程学报》2022年第2期41-47,共7页Journal of Water Resources and Architectural Engineering

摘　　要：挡土墙的结构形式多种多样,在山区公路改扩建工程中衡重式挡土墙得到广泛运用。受山区地形限制,墙后填土为有限宽度的情况较为常见。为了研究有限宽度无黏性填土下衡重式挡土墙墙后主动土压力,运用自适应网格有限元数值分析方法分别模拟了衡重式挡土墙平动位移模式下不同填土宽深比、自然岩层倾角、填土内摩擦角、边界界面摩擦角与衡重台宽度,分析了不同工况下模拟结果对填土滑动破坏面位置及主动土压力分布的影响。结果发现:可将有限元结果总结归纳为7种典型破坏模式;填土宽深比和界面摩擦角决定着墙后填土的破坏模式,l_(11)滑动面与自然岩层交点随着宽深比增大而逐渐上升。随着边界摩擦角增大,“反射”滑动面最终不再产生;内摩擦角对主动土压力分布影响较大,土压力随着内摩擦角增大而显著减小。Retaining walls have a variety of structural forms,of which balance weight retaining walls have been widely used in mountain highway reconstruction and expansion projects.Due to the limitation of the mountainous terrain,it is more common that the soil behind the wall is of limited width.In order to analyze the active earth pressure behind the balance weight retaining wall under the cohesionless soil of finite width,the adaptive mesh finite element numerical analysis method is used to simulate the translation displacement mode of the balance weight retaining wall respectively.Under different soil width-depth ratios,natural rock stratum inclination,soil internal friction angle,boundary interface friction angle and balance platform width,the influence of simulation results on the position of soil sliding failure surface and active earth pressure distribution under different working conditions is analyzed.The results show that the finite element results can be summarized into seven typical failure modes.The width-to-depth ratio of the fill and the interface friction angle determine the failure mode of the soil behind the wall.The intersection point between the l_(11) sliding surface and the natural rock formation gradually rises with the increase of the width-to-depth ratio.And as the boundary friction angle increases,the"reflecting"sliding surface is eventually no longer generated.The soil internal friction angle has a great influence on the active earth pressure distribution,and the earth pressure decreases significantly with the increase of the soil internal friction angle.

关 键 词：衡重式挡土墙 有限宽度 主动土压力 有限元极限分析 

分 类 号：TU443[建筑科学—岩土工程]