岩土力学 ›› 2018, Vol. 39 ›› Issue (S2): 245-253.doi: 10.16285/j.rsm.2018.0839

• 岩土工程研究 • 上一篇    下一篇

软土地区地下连续墙深大基坑的变形性状研究

吴昌将1, 2，孙召花1，赖允瑾2，包 华1   

  1. 1. 南通大学 建筑工程学院，江苏 南通 226019；2. 同济大学 岩土及地下工程教育部重点实验室，上海 200092
  • 收稿日期:2018-05-12 出版日期:2018-12-21 发布日期:2019-01-06
  • 通讯作者: 孙召花，女，1987年生，博士，讲师，主要从事岩土工程方面的教学和科研。E-mail：huahuadeshuijingyu@126.com E-mail:15921360161@163.com
  • 作者简介:吴昌将，男，1984年生，博士，高级工程师，主要从事地下结构、岩土工程等方面的教学和科研。
  • 基金资助:
    江苏省高校自然科学基金研究面上项目（No.17KJD560002）、江苏省自然科学基金青年项目（No.BK20180954）。

Study of deformation characteristics of diaphragm wall induced by deep large excavation in soft soil region

WU Chang-jiang1, 2, SUN Zhao-hua1, LAI Yun-jin2, BAO Hua1   

  1. 1. College of Architecture Engineering, Nantong University, Nantong, Jiangsu 226019, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China
  • Received:2018-05-12 Online:2018-12-21 Published:2019-01-06
  • Supported by:
    This work was supported by the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (17KJD560002) and the Jiangsu Natural Sicence Foundation of Youth (BK20180954).

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摘要： 结合前人对上海地区地下连续墙基坑实测分析的成果，以上海软土地区两个典型类似的深大基坑为工程背景，通过现场实测数据的分析，研究基坑采用顺作法两墙合一地下连续墙基坑的变形性状以及对坑外建筑的影响，尤其是基坑浅层软土层厚度和开挖面积因素。研究结果表明，（1）基坑施工过程中围护墙侧向变形均呈“鼓肚子”抛物线形状。基坑变形主要产生在基坑开挖阶段，换撑产生的二次变形仅为开挖阶段的10%左右。挖深范围内的软土层厚度对地墙侧移影响较大；（2）软土地层的厚度不仅影响坑外地表沉降最大值与位置，而且对沉降发展速率及稳定时间均有较大影响，但基本不改变沉降凹槽型的分布形态；（3）基坑开挖过程中基坑围护墙顶与坑内立柱均处于向上隆起状态，隆起量以“碟状”的形态从坑边至坑中不断增大，中间区域的相邻立柱隆起差异量不大，靠近基坑边的相邻立柱隆起差异量大，其差异界限在距离坑边约(1.0～1.5)He （He为开挖深度）处，软土地层厚度、基坑开挖面积大小对立柱隆沉的量值有较大影响；（4）基础形式与埋深、离基坑的距离对基坑开挖而引起坑外建筑沉降的影响程度尤为明显。

关键词: 深开挖, 两墙合一, 地下连续墙, 变形性状, 现场实测

Abstract: Based on previous statistics analysis on deep excavations with diaphragm wall as retaining structure in Shanghai, the deformation characteristics of dual-purpose diaphragm wall and impact on adjacent architecture outside are comprehensively studied through the analysis of field monitoring data of two typical and similar deep large excavations in soft soil region, as well as the effects of soft soil layer thickness in superficial stratum and excavation area. The research results show that: (1) The lateral displacement of retaining wall behaves as a parabolic curve during the construction. The deformation is almost generated in the excavation stage while the sequential deformation caused by the removal of struts is only about 10% of the amount of excavation stage. The thickness of soft soil layer in the depth of excavation has a great influence on the lateral displacement of diaphragm wall. (2) It is revealed that the thickness of soft soil layer can affect significantly not only on the maximum ground surface settlement and its location; but also on the acceleration of settlement and its stabilization. However, it will not change the groove shape distribution of ground settlement. (3) The upper of diaphragm wall and pillars are in uplift state; and the upheaval increases from the edge of the excavation to the middle during the construction. There is not a large difference for the upheaval between adjacent pillars in the middle of excavation; but it is relatively larger for the adjacent pillars at the edge of excavation. That difference boundary is about (1.0-1.5)He (He is the excavation depth) away from the edge of excavation. The thickness of soft soil layer and excavation area obviously influence great much on the upheaval value of pillars. (4) Especially, the type and depth of foundation and the distance away from the excavation contribute considerably to settlement of adjacent building outside.

Key words: deep excavation, dual-purpose diaphragm wall, diaphragm wall, deformation characteristics, field monitoring

中图分类号: 

  • TU 473
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