粉砂地层深基坑支护结构变形安全监测与分析  

Safety Monitoring and Analysis on Deformation of the Support Structure for Deep Foundation Excavation in Silt Stratum

作　　者：刘波[1] 黄佩格[1] 黄冕[1] 王凯强[1] 江永华[1] 

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《施工技术》2014年第11期106-111,共6页Construction Technology

基　　金：国家自然科学基金项目(51274209);国家科技支撑计划项目(2012BAK24B0201);教育部博士点基金项目(20110023110004)

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。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.

关 键 词：深基坑 支护 数值分析 位移 变形 监测 

分 类 号：TU753[建筑科学—建筑技术科学]