刚性挡土墙后设置EPS垫层的设计方法研究

Study on design scheme of installing EPS cushion behind the rigid retaining wall

基于模型试验和数值模拟对设置聚苯乙烯泡沫(EPS)垫层的刚性挡土墙受力特性进行分析,首先验证了EPS垫层的减压作用,其次讨论了EPS垫层的弹性模量及厚度对EPS垫层减压效果的影响,最后提出了刚性挡土墙后EPS垫层的设计方法.结果表明:在挡土墙后设置EPS垫层可降低挡土墙土压力,EPS垫层的减压效果随垫层弹性模量的减小和厚度的增加而增加,提出的EPS垫层设计方法能够同时满足减压效果、路面沉降和经济性要求.

Based on the model test and numerical simulation,the mechanical characteristics of the rigid retaining wall with expanded polystyrene(EPS) cushion behind the wall were studied.Firstly,the effect of EPS cushion on reducing earth pressure was verified.Secondly,the influences of elastic modulus and thickness of EPS cushion on the earth pressure reduction were discussed.Finally,a design method of EPS cushion behind rigid retaining wall was proposed.The results show that the earth pressure of retaining wall is reduced effectively by installing EPS cushion behind the retaining wall.The decompression effect of EPS cushion increases with the decrease of cushion elastic modulus and increase of thickness.The EPS cushion design method proposed can meet the requirements of pressure reduction effect,road settlement and economy.