加筋重力式挡土墙抗震设计方法研究

Research on aseismic design of reinforced gravity retaining wall

汶川地震震害调查结果表明重力式挡土墙易发生震害,而加筋结构除面板易破坏外,整体抗震性能表现良好,因此,在继承前人研究成果,提出了将加筋土技术移植到重力式挡土墙中的改进型支挡结构-加筋重力式挡土墙,并按力多边形法推导了结构的抗震设计方法。之后,通过大型振动台试验对其耐震能力和推导公式进行了验证,分析发现,加筋重力式挡墙所受地震土压力较普通重力式挡墙小,达到提高抗震性能与经济节约的双重功效,在地震烈度为8度以上的区域宜代替普通重力式挡墙使用。此外,试验实测地震土压力和破裂角与理论计算接近,说明此方法具有一定的适用性。

The field investigation results of retaining wall in Wenehuan earthquake indicate that the gravity retaining wall can be damaged easily, but the reinforced earth structures generally exhibit good performance. Therefore, an improved type of retaining structure-reinforced gravity retaining wall was proposed by introducing the reinforced technique into the gravity retaining wall, and then the aseismie design method was derived based on the polygon of force. Furthermore, its aseismic performance and the derived formula were verified by the shaking table test. Results show that the earth pressure of the new retaining wall during earthquake shall be smaller than that of the ordinary gravity retaining wall, so that the efficacy in improvement of aseismic performance and economy can be achieved and it can be used to replace the ordinary gravity retaining wall in the regions with seismic intensity over 8 degree. In addition, the earth pressure and rupture angle measured in tests were close to the calculated ones by the theoretical formulation, indicating that the approach has good applications.