软土地基上加筋土挡墙变形特征的有限元分析

针对在加筋土挡墙设计中,一般不考虑地基变形影响,而软土地基过大变形会造成加筋土挡墙失效的问题,结合某加筋土挡墙实例,利用数值模拟方法建立了软土地基上加筋土挡墙数值模型,分析了软土地基不均匀变形对加筋土挡墙的影响。结果表明:由于加筋土挡墙基底压力的偏心作用,会引起软土地基的差异沉降,对墙体侧向变形及向临空面倾覆有不利影响;加筋土挡墙面板变形主要是由地基不均匀沉降引起的;加筋土挡墙地基的沉降曲线近似线性,面板下地基沉降量最大。参数分析还揭示,地基土的杨氏模量和面板仰角、回填土特性等对加筋土挡墙变形特征均存在较大影响。

FEM analysis of deformation characteristics of reinforced retaining walls on soft foundation

Generally,the impact of foundation deformation has been not taken into account in the design of the reinforced retaining walls.However,tremendous deformation of the soft foundation may cause their failure.Based on the practice of a reinforced retaining wall,a model for the reinforced retaining wall on the soft foundation is established by means of numerical modeling method.The impact of differential deformation of the soft foundation on the reinforced retaining wall is analyzed.The results show that:(1) the eccentric action of the base pressure of the reinforced retaining wall will lead to the differential settlement of the soft foundation,and thus it results in adverse impact on the wall deformation and the failure of the free face;(2) the deformation of the face of the reinforced retaining wall is mainly caused by the differential settlement of the soft foundation;(3) the settlement curve of the foundation with the reinforced retaining wall is nearly linear,and the largest settlement point is under the face.The parametric analysis also indicates that the Young’s modulus and face angle of the foundation soils and the characteristics of the backfill also have great impact on the deformation characteristics of the reinforced retaining wall.