锚拉式挡土墙沉降力学特性模型试验研究

Model Test and Study of Mechanical Characteristics for Anchored Retaining Wall under Settlement

沉降破坏是挡土墙结构物的一种重要的破坏形式,研究沉降情况下锚拉式挡土墙的受力和变形特性,对于分析该类型挡土墙的稳定性和耐久性具有重要意义。基于室内模型试验,研究了不同类型锚拉式挡土墙在沉降作用下的侧向土压力、位移和锚杆轴力的变化情况。主要结论如下:单锚杆锚拉式挡土墙对于沉降破坏有较好的抵抗能力,侧向土压力随着沉降量的递增而显著增加且最大值出现在锚杆位置处,设计和施工需对锚杆位置处进行加固处理;提高锚杆位置可以显著减小单锚杆锚拉式挡土墙锚杆轴力和墙体位移,但会造成侧向土压力的增大;双锚杆锚拉式挡土墙可以显著改善沉降中挡土墙受力情况,提高墙体的稳定性,但会导致锚杆轴力的相对增大。

The settlement damage is one of the most important destruction types of the retaining wall structure,therefore study the mechanical and deformation characteristics of the anchored retaining wall under the influence of settlement is of great significance for analysis of the stability and durability of this type of retaining wall.Based on the indoor model test,the change rules of lateral earth pressure,displacement and anchor stress are studied.Main conclusions are drawn as follows：anchored retaining wall with single anchor has better resistance to settlement destruction,the lateral earth pressure increases with the increase of settlement volume and the maximum value appeared around the anchor,thus necessary reinforcement should be applied around the anchor;the improvement of anchor position could significantly reduce the anchor stress and displacement of anchored retaining wall with single anchor while the lateral earth pressure would increase;and anchored retaining wall with double anchor could remarkably improve the mechanical condition and stability of the wall,but could lead to relative increase of anchor stress.