无连接挡板高填方路堤薄壁挡土墙土压力模型试验研究

根据远当国防公路扩建工程,提出无连接挡板高填方路堤薄壁挡土墙新型结构。应用土压力盒和钢筋应变片进行模型试验,测试挡土墙土压力分布规律和拉筋应变的变化规律。挡土墙土压力不同于经典土压力理论,从挡土墙顶部向下到1 3高度以上,土压力分布呈线性增加,1 3高度以下,土压力随高度变化不大;土压力的分布规律与挡土墙面板后填料的性质无关。试验及分析表明,该连接挡板式薄壁挡土墙结构是一种合理、经济、可以应用于高路堤实际工程的新型挡土结构。

Experimental Research of Earth Pressure on Unconnected Brick High Filled Road Dyke Thin Retaining Wall

Based on the reconstruction engineering of Yuanan to Dangyang national defense highway,the paper introduces a new reinforced retaining wall,which is of unconnected brick high filled road dyke thin retaining wall structure.In model experiment,earth pressure sensors are used to test the earth pressure and strain gauge to test the strain of the reinforcing steel bars.It is proved that retaining wall earth pressure is not a linear distribution;it means that the law is different to the Rankin and Coulomb earth pressure laws,the earth pressure distributing is linear distribution from top to 1/3 h of the retaining wall,with little change of the earth pressure from 1/3h to the bottom of the retaining wall.The earth pressure distribution is independent of the properties of the fillings.It is proved that unconnected brick high filled road dyke thin retaining wall is reasonable and cost effective applicable to practical engineering in the high filled road dyke.