面板对土工袋挡土墙工作性状影响的足尺试验研究

Full Scale Experimental Study on Influence of Panels on Behavior of Soilbag-constructed Retaining Walls

鉴于在土工袋挡土墙外侧设置面板可能会影响土工袋挡土墙的工作性状,开展了固定面板和不固定面板的土工袋挡土墙的足尺试验,探究了面板对土工袋挡土墙变形模式与土压力的影响。结果表明,固定和不固定面板的土工袋挡土墙均表现为悬臂式变形模式,但作用在不固定面板上的土压力小于作用在固定面板上的土压力。基于弹性理论建立了有限位移条件下土工袋挡土墙土压力的解析解,分析了土工袋挡土墙土压力与水平变形的关系,发现由于不固定面板的变形约束作用小于固定面板,作用在不固定面板上的土压力与不带面板的土工袋挡土墙的土压力均接近于计算主动土压力,表明不固定面板土工袋挡土墙能更加充分利用土工袋挡土墙柔性的特点,从而有效降低墙后侧向土压力。

Setting a panel outside the soilbags-constructed retaining wall may affect the behavior of the wall.There-fore,a full-scale test of the soilbags-constructed retaining wall with fixed panels and with unfixed panels were conducted to explore the influence of the panel on the deformation mode and lateral earth pressure of the wall.The results show the walls with fixed and unfixed panels deformed laterally in a cantilever-like manner,but the lateral earth pressure acting in the fixed-panel wall is greater than that in the unfixed-panel wall.A calculation formula for calculating the earth pressure acting on the soilbags-constructed retaining wall under limited displacement was established based on the linear elastic constitution theory,and then it was used to analyze the relationship between the lateral earth pressures and lateral strain.It is found that distribution of the lateral earth pressure of the soilbags-constructed retaining wall with unfixed panel is close to the calculated active earth pressure as a result of the poor deformation constraint of the unfixed-panel,which indi-cates that the flexible characteristics of the soilbags-constructed retaining wall can be fully utilized by the wall with un-fixed panel,so as to effectively reduce the earth pressure behind the wall.