路肩式土工格室柔性挡墙受力及变形分析

Analysis of the stress and deformation characteristics of geocell flexible retaining wall for subgrade shoulders

为研究路肩式土工格室柔性挡墙受力及变形特点,依托陕西省省道205线子长县城区过境段改建工程,开展模型试验和现场监测。模型试验参考工程原型材料确定试验模型相似比为1:3,挡墙模型几何参数为墙高2 m,墙厚1 m,坡率为1:0.5。通过模型试验与现场监测得到路肩式土工格室柔性挡墙基低压力、水平土压力及水平变形的变化规律。路肩式柔性挡墙基底压力随挡墙填筑高度增加而增大,施工完成后略有减小;每一层挡墙墙体格室上的水平土压力并非均匀分布,挡墙中间水平土压力>挡墙内侧水平土压力>挡墙外侧水平土压力;稳定后的水平土压力和水平变形沿挡墙高度呈鼓形分布,在墙高1/2H处达到最大;采用微分单元法计算挡墙墙背水平土压力更接近工程实际。

To study the deformation characteristics and mechanical properties of geocell flexible retaining walls for subgrade shoulders,model test and filed test,based on the reconstruction project of highway205line in Zichang County of Shaanxi Province,were carried out.The dimensions of the simulation model was2m in height,1m in thickness,and1:0.5in side slope.The lateral earth pressure,foundation pressure and lateral deformation of the geocell flexible retaining walls for subgrade shoulders were obtained by model test and filed test.Foundation pressure increases gradually during the construction progress.After completing construction,foundation pressure reduced slightly.The lateral earth pressure of the same geocell layer is not evenly distributed.The lateral earth pressure in the middle is the largest,the inside is lower,and the outside is the lowest.The lateral earth pressure and deformation exhibit the shape of drum with height and reached the maximum in the middle of wall.Calculating the lateral earth pressure based on the differential element methods better fits the engineering reality.