›› 2017, Vol. 38 ›› Issue (11): 3295-3303.doi: 10.16285/j.rsm.2017.11.027

• 岩土工程研究 • 上一篇    下一篇

软土区基坑预降水引起支护墙侧移的典型参数影响研究

曾超峰1, 2, 3,薛秀丽1,郑 刚2   

  1. 1. 湖南科技大学 岩土工程稳定控制与健康监测湖南省重点实验室,湖南 湘潭 411201; 2. 天津大学 滨海土木工程结构与安全教育部重点实验室,天津 300072;3. 广西大学 工程防灾与结构安全教育部重点实验室,广西 南宁 530004
  • 收稿日期:2016-08-22 出版日期:2017-11-10 发布日期:2018-06-05
  • 作者简介:曾超峰,男,1987年生,博士后,讲师,硕士生导师,主要从事岩土工程方面的科研与教学工作。
  • 基金资助:

    国家自然科学基金项目(No. 51308209, No. 51578164, No. 51708206, No. 11602083);滨海土木工程结构与安全教育部重点实验室开放课题(No. 2017-KF03);湖南省自然科学基金项目(No. 2016JJ6044);湖南省教育厅项目(No. 15C0557)。

A parametric study of lateral displacement of support wall induced by foundation pre-dewatering in soft ground

ZENG Chao-feng1, 2, 3, XUE Xiu-li1, ZHENG Gang2   

  1. 1. Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China; 2. Key Laboratory of Coast Civil Structural Safety of the Ministry of Education, Tianjin University, Tianjin 300072, China; 3. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning, Guangxi 530004, China
  • Received:2016-08-22 Online:2017-11-10 Published:2018-06-05
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (51308209, 51578164, 51708206 and 11602083), the Research Project of Key Laboratory of Coast Civil Structural Safety of the Ministry of Education (2017-KF03), the Natural Science Foundation of Hunan Province (2016JJ6044) and the Scientific Research Fund of Hunan Provincial Education Department (15C0557).

摘要: 基于天津地区透水层和弱透水层交替出现的场地水文地质条件,通过大量数值计算与工程实测对比,结合非线性回归分析,研究了预降水时间t、预降水深度 、基坑长宽L, 基坑宽度b等参数对基坑预降水过程中支护墙侧移发展的影响规律。随t延长,最大支护墙侧移 呈增长速率不断减小的非线性增长,在预降水刚开始的几天内,支护墙侧移即可占据其预降水过程中稳定侧移的很大比重。其次, 对 及支护墙悬臂侧移深度 的发展有重要影响,总的来说, 及 均随 增大而增大,具体地,当 达到场区第2透水层前(后), 随 的线性增长比例较小(大),当 达到场区深厚弱透水层厚度一半之前(后), 的增长接近于(明显快于) 的增长。另外,对于同一宽度b基坑,当基坑长度L达到一定程度后,预降水引起的基坑长度方向边角效应总是发生在基坑两侧距离坑角某一确定范围之内,在预降水过程中,若支护墙变形需要严格控制时,可通过布置横隔墙,使得相邻横隔墙间距 与b之比在4以内,或 / 在3.7以内,利用基坑边角效应减小预降水引起的最大支护墙侧移。

关键词: 软土地基, 深基坑预降水, 支护墙侧移, 有限元计算, 边角效应

Abstract: Strata in Tianjin area are featured as an alternated multi-aquifer aquitard system. Based on this strata condition, lots of numerical calculations investigate the effect of deep foundation pre-dewatering on lateral displacement of support wall in soft ground under different construction conditions, including dewatering time (t), dewatering depth ( ), pit length (L) and pit width (b). The calculation results were compared with relevant field data, and nonlinear regression analysis was then conducted based on the calculation and observation results. The results indicate that the maximal lateral displacement of support wall ( ) increases nonlinearly with t, and the growth rate decreases continuously. In the first few days of the dewatering, lateral displacement of support wall development can occupy large proportion of its stable value during pre-dewatering. Moreover, has a great influence on the development and the depth of wall with cantilever-type deflection ( ). In general, and will be larger with the increase of . Specifically, before reaches the second permeable stratum of the field, increases linearly with by a small scale. Otherwise, the growth proportion of with increases greatly. Before reaches the center location of the thick aquitard, increases synchronously with increased, and otherwise, the increment is apparently greater than the increment. Furthermore, as to the same pit width (b), when the pit length (L) reaches a specific value, the corner effect induced by dewatering always appears at a specific distance from the pit corner along the pit length direction. In practical pre-dewatering, cross wall can be used to partition the pit into some parts, and let the ratio of cross wall spacing ( ) to b be less than 4, or let / be less than 3.7, using the corner effect to effectively reduce the maximal lateral displacement of support wall induced by pre-dewatering.

Key words: soft ground, deep foundation pre-dewatering, lateral displacement of support wall, finite element calculation, corner effect

中图分类号: 

  • TU 46+3

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