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隧道建设(中英文) ›› 2012, Vol. 32 ›› Issue (1): 46-52.DOI: 10.3973/j.issn.1672-741X.2012.01.009

• 研究与探索 • 上一篇    下一篇

天津站交通枢纽深基坑降水开挖引起的建筑物沉降分析

王玥   

  1. (中铁隧道集团技术中心, 河南 洛阳 471009)
  • 收稿日期:2011-11-18 修回日期:2011-12-16 出版日期:2012-02-20 发布日期:2012-03-09
  • 作者简介:王玥(1984—),男,辽宁朝阳人,2010年毕业于北京科技大学岩土工程专业,硕士,助理工程师,现从事高地温喷射混凝土及无尘喷射混凝土技术的研究工作。

Analysis on Ground Settlement induced by Dewatering and Excavation in Construction of Deep Foundation Pit of Tianjin Railway Station Terminal

WANG Yue   

  1. (Technology Center of China Railway Tunnel Group Co., Ltd., Luoyang 471009, Henan, China)
  • Received:2011-11-18 Revised:2011-12-16 Online:2012-02-20 Published:2012-03-09

摘要: 以天津站交通枢纽3标段基坑工程实践为例,利用数值模拟试验,分析施工中降水和开挖对地层沉降造成的影响,指出降水施工引发的沉降占总量的90%,开挖施工的不利影响主要体现在差异沉降上。在实际施工中应高度重视及时封堵隔水帷幕漏水和架设足量的内支撑,结合监测数据,对模拟结果进行分析,肯定盖挖逆作工法在沉降控制上的优势,并提出实际施工的优化方案。

关键词: 深基坑, 工程降水, 地层沉降, 逆作法, 渗流场

Abstract: The influence of dewatering and excavation on the ground settlement is analyzed by means of numerical simulation, with the construction of the foundation pit of No. 3 bid section of Tianjin Railway Station Terminal as an example. It is concluded that the settlement induced by dewatering takes 90% of the total, while the adverse influence of excavation mainly takes the form of differential settlement. Therefore, the water seeping through the waterproofing curtain should be timely sealed and enough waling should be set up during construction. Analysis is also made on the simulation results on basis of the monitoring data and conclusion is drawn that the cutandcover topdown construction method is superior in terms of settlement control. Finally, an optimized construction scheme is proposed.

Key words: deep foundation pit, dewatering, ground settlement, topdown construction method, seepage field