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隧道建设（中英文） ›› 2021, Vol. 41 ›› Issue (12): 2113-2120.DOI: 10.3973/j.issn.2096-4498.2021.12.012

• 研究与探索 • 上一篇    下一篇

钢支撑滞后施工对基坑支护体系的影响研究

孔茜1， 2， 3， 杨睿1， 2， 3   

  1. (1. 中交第二航务工程局有限公司， 湖北 武汉 430040； 2. 长大桥梁建设施工技术交通行业重点试验室，湖北 武汉 430040； 3. 交通运输行业交通基础设施智能制造技术研发中心， 湖北 武汉 430040)
  • 出版日期:2021-12-20 发布日期:2022-01-05
  • 作者简介:孔茜（1990—），女，湖北枝江人，2015年毕业于河海大学，水利水电工程专业，硕士，工程师，现从事基坑设计与施工研究工作。E-mail： 1006858538@qq.com。

Influence of Delayed Steel Support on Support System of Foundation Pits

KONG Qian1, 2, 3, YANG Rui1, 2, 3   

  1. (1. CCCC Second Harbor Engineering Company Ltd., Wuhan 430040, Hubei, China; 2. Key Laboratory of Large-span Bridge Construction Technology, Wuhan 430040, Hubei, China; 3. Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure, Wuhan 430040, Hubei, China)

  • Online:2021-12-20 Published:2022-01-05

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摘要： 为研究钢支撑滞后施工对钢支撑轴力、围护桩位移及弯矩、冠梁内力的影响，以某明挖暗埋隧道基坑为工程依托，通过监测数据分析钢支撑滞后施工时围护桩深层水平位移以及钢支撑轴力的变化规律。通过数值模拟得到实际滞后工况、正常施工工况以及单道钢支撑滞后工况下的围护结构内力及变形，同时引入影响系数量化钢支撑滞后施工对围护桩深层水平位移及弯矩、钢支撑轴力、冠梁弯矩及剪力的影响。结果表明： 1）围护桩深层水平位移受第1道钢支撑影响最大，且影响范围大于土方开挖范围，而对围护桩弯矩的影响范围与土方开挖范围一致； 2）冠梁更易受弯破坏而非受剪破坏； 3）钢支撑滞后施工下，邻近钢支撑的轴力可以分担一部分滞后钢支撑的轴力，但同一断面内钢支撑的轴力和仍小于及时支撑工况； 4）位于土方开挖与非开挖交界处的围护桩弯矩、深层水平位移、钢支撑轴力均为临近范围内的最大值。

关键词: 明挖暗埋隧道, 影响系数, 钢支撑, 滞后施工, 围护桩深层水平位移, 围护桩弯矩, 钢支撑轴力, 冠梁内力

Abstract: To study the impact of delayed steel support construction on the axial force of steel supports, displacements, and bending moments of retaining piles, and internal force of the crown beam, a case study is conducted on the foundation pit of an opencut and buried tunnel. Monitoring data is used to analyze the variation laws of retaining pile displacement and axial force of steel support during delayed steel support construction. The internal force and the deformation of the retaining structure under the actual delayed, normal construction, and delayed conditions of single steel supports are obtained through a numerical simulation. Moreover, the influence coefficient is introduced to quantify the impact of delayed steel support construction on the horizontal displacement and the bending moment of the deep layer of the retaining pile, the axial force of the steel support, the bending moment, and shear force of the crown beam. The results show the following: (1) The horizontal displacement of the deep layer of the retaining pile is mainly affected by the first steel support, and the influence range is larger than that of earthwork excavation. In contrast, the influence range of the bending moment of the retaining pile is consistent with that of earthwork excavation. (2) The crown beam is more susceptible to bending than shearing. (3) Under the delayed construction, the axial forces of adjacent steel supports can share part of the axial forces of the delayed steel support, whereas the sum of axial forces of steel support in the same section is still less than that of timely support. (4) The bending moment of retaining pile, the horizontal displacement of deep layer, and the axial force of the steel support at the junction of earthwork and trenchless excavations are all in their maximum in the adjacent range.

Key words: open-cut and buried tunnel, influence coefficient, steel support, delayed construction, deep horizontal displacement of piles, bending moment of piles, axial force of steel supports, internal force of crown beam

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