通过三维有限元软件ADINA软件,对基坑以及桩锚支护结构进行了三维模拟分析。结果表明,随着基坑开挖深度的增加,桩身中部和桩的顶部有较大的变形。随着施工步序的增加,桩身的最大水平位移逐渐下移,桩身的水平位移曲线有明显的极大值点,桩的最大水平位移发生在桩身2/3处。桩身弯矩变化的主要原因是侧向土压力随着开挖深度的增加而不断增大。在支护结构中,当锚杆发挥作用后,水平位移由于主动土压力增大而受到限制,而后随着土方开挖,周围土体竖向位移又继续增大,直到开挖结束后周边地表的竖向位移趋于稳定。在基坑开挖过程中,土压力随着基坑深度的增加而增大,锚杆与土体之间产生摩阻力,从而使轴力变大。 Through three-dimensional finite element software ADINA software, three-dimensional simulation analysis of foundation pit and pile-anchor supporting structure was carried out. The results show that with the increase of excavation depth, the middle of the pile and the top of the pile have larger deformation. With the increase of construction steps, the maximum horizontal displacement of the pile body gradually moves downward, and the horizontal displacement curve of the pile body has obvious maximum points. The maximum horizontal displacement of the pile occurs at 2/3 of the pile body. The main reason for the change of pile bending moment is that lateral earth pressure increases with the increase of excavation depth. In the support structure, when the anchor rod play a role, the horizontal displacement is limited due to the increase of active earth pressure, and then with the excavation of earthwork, the vertical displacement of the surrounding soil body continues to increase until the surrounding surface The vertical displacement tends to be stable. In the excavation process of the foundation pit, the earth pressure increases with the increase of the depth of the foundation pit, and the friction between the anchor rod and the soil body increases, so that the axial force becomes larger.