土工基础

›› 2014, Vol. 28 ›› Issue (6): 9-12.

• 工程实录 • 上一篇    下一篇

深基坑土体水平位移与坑底隆起的研究

王宁伟，韩 旭，王心哲   

  1. (沈阳建筑大学土木工程学院，沈阳 110168)
  • 收稿日期:2014-01-21 出版日期:2014-12-25 发布日期:2015-01-12
  • 作者简介:王宁伟（1964-），男，教授，研究方向为软土地基加固、深基坑工程等。

Study of Horizontal Displacement and Bottom Heave in the Deep Excavations

WANG Ningwei, HAN Xu, WANG Xinzhe   

  1. (School of Civil Engineering, Shenyang Jianzhu University, Shenyang, 110168)
  • Received:2014-01-21 Online:2014-12-25 Published:2015-01-12

摘要： 以营口地区万达广场深基坑工程为研究背景，通过整理现场监测数据，得到同一场地条件下不同支护形式的周边土体水平位移的变化规律，分析后得出以下结论：1. 软土地区的高强度支护结构对应的墙后深层土体水平位移呈竖向型，低强度支护结构对应的深层土体水平位移呈抛物线型。2.开挖深度以上的墙后土体深层水平位移最大值为(2.0×10－4~6.2×10－4)hd，最大水平位移发生于(0.7~1.0)hd之内。3.开挖深度以下土体按照墙后土体水平位移变化趋势分为坑底隆起增强区和坑底隆起减弱区，其中深层土体水平位移最大值为(3.5×10－4~10.0×10－4)hd，坑底隆起增强区大致为坑底以下0.4hd范围内，支护结构强度越低，坑底隆起增强区范围越大。

关键词: 软土：深基坑, 深层水平位移, 坑底隆起

Abstract: Within the same deep excavation site of Wanda Square in Yingkou, the horizontal displacements under different supporting systems are monitored and analyzed in this paper. The following conclusions are obtained: 1) In the soft soil areas, the linear horizontal displacement distribution is found in a high stiffness supporting system and a hyperbola distribution is observed in the low stiffness supporting system. 2) The maximum horizontal displacement of the deeper soils has a range of 2.0×10-4 to 6.2×10-4 of the excavation depth, which occurs at a zone of 0.7 to 1.0 of the excavation depth. 3) At the bottom of the excavation, two zones of heaving can be found: zone of heave increasing and zone of heave decrease with a heaving range of 3.5 to 10 ×10-4 of excavation depth. The bottom heave increasing zone is approximately located within 0.4 time of the excavation depth. The stiffer the supporting is, the larger the heave increasing zone is.

Key words: Soft Soils, Deep Foundation Pit, Deep Horizontal Displacement, Bottom Heave