加筋土挡墙拐角部位应力应变特征研究

Study on Stress and Strain Characteristics of Corners of Reinforced Earth Retaining Wall

为了对加筋土挡墙拐角部位的受力及变形进行研究,以某工程案例为背景,通过数值模拟分析的方法,建立加筋土挡墙拐角部位的三维数值模型,对拐角部位的应力应变特征进行了研究,并分析了其内在的力学原理。研究结果表明:加筋土挡墙拐角部位更易发生变形和破坏;拐角部位潜在破裂面的空间形态呈现"圈椅"状,与两侧墙面相交;对于格栅拉应力的分布,呈X型的拐角部位和与墙面平行的直线部位是完全不同的;拐角部位的水平位移在垂直和平行墙面的两个方向都有发生,而直线部位只在垂直墙面的方向有水平位移;拐角部位与直线部位之间存在过渡区域,过渡区域的范围与潜在变形破坏的范围有关。

In order to explore the stress and strain characteristics around the corner of reinforced earth retaining wall,a certain engineering example was selected as a study case,and a 3D numerical model was established.After that,the stress-strain characteristics of the corners and the inherent mechanics principle were analyzed.The results show that the corners of the reinforced earth retaining wall are more prone to deformation and damage.The spatial shape of the potential fracture surface at the corner appears the shape of“circle chair”,which intersects with two wall surfaces.As for the distribution of grid tensile stress,the corner with“X”shape is completely different from the flat parts paralleling to the wall surface;The horizontal deformation of the corners occurs in both directions of the vertical and parallel walls,while the straight portions are only horizontally deformed in the direction of the vertical wall.There is a transition between the corner and the straight line,and the extent of the transition is related to the range of potential deformation and damage.