中文摘要：

以廊坊市某桩锚支护基坑工程为背景，采用FLAC-3D计算软件进行三维模型计算，分析了基坑开挖对周围环境的影响范围，得到了桩锚支护基坑的围护桩水平位移在不同开挖阶段随深度的变化规律。结果表明：土方开挖对基坑周围土体的影响范围约为3倍的开挖深度；开挖过程中，桩体水平位移在锚索作用位置明显收敛，最大位移位置基本处于桩体中部；围护桩水平位移在各开挖阶段与深度变化规律相似。桩体水平位移的数值计算结果和实测结果相吻合。

英文摘要：

Based on an anchored pile support foundation excavation in Langfang City, a FLAC-3D model is established for numerical analysis. The influence scope of excavation on the surrounding circumstance is predicted, the change law of lateral displacement of retaining piles in different excavation stages with depth is obtained. The results show that the influence scope of excavation on the surrounding soil is approximately triple of the depth of the foundation excavation. During excavation, the lateral displacement is constrained obviously in the position of anchor, the maximum displacement is found near mid-height of the pile. The lateral displacements of retaining piles during different excavation stages show the similar rules. The simulated values of horizontal displacement of the pile agree well with those obtained from field measured results.