两级重力式挡土墙结构体系加固机理及优化设计研究

Study on Reinforcement Mechanism and Optimization Design of Structure System for Two-stage Gravity Retaining Wall

为研究塔韩铁路两级重力式挡土墙变形及受力的影响因素,采用正交分析优化第一,第二级挡土墙高度和第二级挡土墙基底倾角以及两级挡土墙间的错台宽度等参数;以最大位移(包括竖直、水平)、最大主应变、最大剪应变以及最大平均应力为优化评价指标,建立两级重力式挡土墙数值计算模型并提出优化设计参数。结果表明:(1)第一级挡土墙高度对两级重力挡土墙贡献最大;(2)优化参数组合值为:第二级挡土墙基底倾角0.2∶1.0,两级挡土墙间错台宽度3 m。

To study the factors influencing the deformation of and the stress in the two-stage gravity retaining wall along Tahan Railway, orthogonal optimization was applied to the parameters, including height of the firstand the second- stage retaining wall, basement inclination of the second-stage wall and faulting width of the two stages of wall; then maximum displacement （vertical ＆ horizontal ）, maximum principal strain, maximum shear strain and maximum average stress were used as evaluation indicators to establish the numerical calculation model for two-stage gravity retaining wall and put forward the parameters for optimization design. The result shows that, （1） the height of the first-stage retaining wall has major contribution to the second-stage ; （2） the value of optimization parameter combination is as follows, the basement inclination of the second-stage- 0. 2 ： 1.0, the faulting width of the two stages ： 3 m.