预应力返包式加筋土挡墙的动力响应分析

在地震作用下,返包式加筋土挡墙作为一种柔性结构常因侧向变形较大或局部产生破坏而影响其正常使用。为解决该问题,提出了预应力返包式加筋土挡墙结构。为完善预应力返包式加筋土挡墙的设计理论,运用拟动力法和附加应力法理论,以预应力返包式加筋土挡墙作为研究对象,结合现有的加筋土挡墙侧向动土压力和侧向位移计算理论,提出了一套用于计算预应力返包式加筋土挡墙侧向动土压力和侧向位移的理论公式。结合室内振动台模型试验验证了所提理论方法的可行性和合理性。该方法计算简洁,适用性广,能够较好地计算预应力返包式加筋土挡墙的侧向动土压力和侧向位移,对完善预应力返包式加筋土挡墙的设计理论具有一定的指导和借鉴意义。

Dynamic response of prestressed wrap-reinforced earth retaining walls

Under the action of earthquakes, as a flexible structure, the wrap-reinforced retaining wall structure can not be used normally because of large lateral deformation or local damage. The prestressed wrap-reinforced earth retaining wall, in which prestress is applied in geosynthetics in order that it is pilled in advance, is proposed. In order to improve the design theory of prestressed reinforced earth retaining walls, takeing the pseudo-dynamic method and the additional stress method as the theoretical basis, the reinforced earth retaining wall with prestressing back-pack is investigated. Based on the existing theory of lateral dynamic earth pressure and lateral displacement of reinforced earth retaining wall, a set of theoretical formulas for calculating the lateral dynamic earth pressure and lateral displacement of prestressed wrap-reinforced earth retaining walls are proposed. The accuracy and reliability of the method are verified by shaking table model tests. The proposed method has the advantages of simple calculation, wide application, and can be used to calculate the lateral dynamic earth pressure and lateral displacement of retaining walls, and it is of a certain significance of guiding and reference for the design theory of prestressed wrap-reinforced earth retaining walls.