加筋土挡墙工作特性数值分析

Numerical Analysis on Working Behaviors of Reinforced Earth Retaining Walls

为加深对墙后填土表面倾斜加筋挡土墙工作特性的理解,采用有限单元法对某一工程实际案例进行了分析。计算中考虑了分级填土过程,研究了施工过程中面板的水平位移,格栅拉力的分布,以及抗滑安全系数等内容。结果表明加筋区域具有较好的整体性,可视为具有加筋长度的等宽重力式挡土墙。破坏形式为沿墙底的滑动破坏和加筋区域以外填土中的圆弧滑动破坏。加筋土挡墙背面也是潜在的破裂面。对比分析了格栅抗拉刚度、长度、间距等因素对面板水平变形、安全系数和破坏模式的影响,所得结果对相关工程有较好的参考意义。

In order to improve the understanding of the working characteristic of reinforced earth retaining walls with inclined fill,a practical engineering case was analyzed using the finite unit method.The step construction process was considered in the calculation.Based on results of the numerical analyses,horizontal displacement of the panel during construction,distribution of the geogrid tension,and factor of the safety were analyzed.Results show that the reinforced area has good integrity and can be regarded as an equal-width gravity retaining wall.The failure includes sliding failure along the bottom of wall and circular sliding failure in the fill outside the reinforced area.The backside of the reinforced earth retaining wall is also a potential rupture surface.The effects of tensile stiffness,length,spacing of geogrid on horizontal deformation,safety factor and damage mode were compared and analyzed.