刚/柔性组合墙面加筋土挡墙离心模型试验

Centrifugal Test on a Reinforced Soil Wall with Flexible/Rigid Facings

摘要:

进行了相同软土地基条件下刚/柔性组合墙面和单一柔性墙面加筋土挡墙的离心模型试验，比较分析了挡墙在墙顶均布荷载作用下的工作性状.试验结果表明，在自重及上覆荷载作用下，刚/柔性组合墙面挡墙其刚性墙面仍基本保持垂直，地基最大沉降发生在连接件锚固端位置；而单一柔性墙面挡墙墙面外倾明显，其地基最大沉降位于墙趾位置；刚/柔性组合墙面加筋土挡墙在工作阶段其墙顶沉降和墙面位移仅为单一柔性墙面挡墙的50%，且前者墙顶不均匀沉降量明显小于后者；刚/柔性组合墙面加筋土挡墙由于预埋件承担了刚性墙面墙背水平土压力，使得筋材拉力及相应的应变减小；刚/柔性组合墙面加筋土挡墙的刚性墙面在墙体中部弯矩最大，为外侧受拉；而墙顶和墙底附近的弯矩较小，为内侧受拉；刚/柔性组合墙面加筋土挡墙能适应软土地基的大变形，并能更好地承担上覆工作荷载.

Abstract:

Centrifugal tests of reinforced soil retaining wall (RSW) with flexible/rigid facings and single flexible facing on the same soft foundation soils were carried out and their working behaviors under uniform loading on top of the walls were compared. The test results show: under the self weight and surcharge loading, for the wall with flexible/rigid facings, the rigid facing remains basically vertical and the maximum foundation settlement is below the embedded anchors; whereas for the wall with flexible facing, the facing tilts forward and the maximum foundation settlement is below the wall toe; during working stage, the lateral displacement of the face and the settlement at the surface of the wall with flexible/rigid facings decrease by approximately 50% as compared to the wall with flexible facing. And the differential settlement at the surface of the former wall is much less than that of the later one; the reinforcement forces and strain of the wall with flexible/rigid facings decrease because the embedded anchors bear the lateral earth pressures acting on the rigid facing; the rigid facing at the middle height bears tensile force at the outside and the maximum bending moment; whereas, the rigid facing nearby its bottom and top bears tensile force at the inside and relatively low bending moment; the wall with flexible/rigid facings can adapt large deformation and differential settlement of the soft foundation and can undertake more working stress on the top of the wall.