格栅条带式加筋胎面挡土墙变形性能数值计算

Numerical Simulation of Deformation Behavior of Tired-Faced Retaining Wall with Geogrid Strip Reinforcement

采用土工格栅加筋的方法提高废旧轮胎挡墙的承载性能,促进废旧轮胎挡墙的推广应用,通过数值计算方法分析了不同墙顶荷载下有无土工格栅加筋的废旧轮胎挡墙的水平变形与竖向沉降反应特征,得出铺设土工格栅加筋的方法可显著减小墙体的水平变形和竖向沉降,提高废旧轮胎挡墙结构的承载能力,随着外荷载的增加,墙体变形模式依次呈凹凸微小变化型、“弯弓”型、“似弯弓”型和“鼓腮”型和直线型。考虑土工格栅的加筋长度、竖向加筋间距以及格栅加筋刚度3种因素对废旧轮胎+土工格栅加筋土挡墙的水平变形的影响,得出在废旧轮胎加筋土挡墙设计中,建议土工格栅的加筋长度选取范围为0.5H~0.7H,土工格栅竖向间距的选取范围为0.4 m~0.7 m,格栅刚度不宜大于5 000 kN/m。

In order to improve the bearing capacity of the waste tire retaining wall and promote the application of the waste tire retaining wall, the geogrid reinforcement method is used to improve the working performance of the waste tire tread retaining wall. Through numerical calculation method, the deformability of reinforced earth retaining wall structure with waste tire and geogrid is researched. The horizontal deformation and vertical settlement of waste tire retaining walls reinforced without geogrid and with geogrid reinforcement are analyzed under the different load values on the top of the walls. The results show that the method of laying geogrid reinforcement in waste tire retaining wall can significantly improve the bearing capacity of the retaining wall and reduce the horizontal deformation and vertical settlement. With the increase of external load values, the deformation modes of the retaining walls change from concave and convex small change type to "curved bow" type, to "like curved bow" type, and to " bulging gill " type and linear type. Furthermore, the influence on the horizontal deformation of waste tire + geogrid reinforced soil retaining walls is studied considering the reinforcement length, reinforcement spacing and reinforcement stiffness of geogrid. It is concluded that in the design of waste tire reinforced soil retaining walls, it is recommended that the reinforcement length of geogrid should be among 0.5H~0.7H, the vertical reinforcement spacing of geogrid should be among 0.4 m~0.7 m, and the geogrid stiffness should not be greater than 5 000 kN/m.