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隧道建设(中英文) ›› 2018, Vol. 38 ›› Issue (5): 740-746.DOI: 10.3973/j.issn.2096-4498.2018.05.003

• 研究与探索 • 上一篇    下一篇

明挖公路隧道基坑钢支撑轴力监测与数值模拟分析

金生吉1, 陈华1,*, 舒哲1, 2, 何丽娟1   

  1. (1. 沈阳工业大学建筑与土木工程学院, 辽宁沈阳 110870; 2. 中冶京诚工程技术有限公司, 北京 100176)
  • 收稿日期:2017-12-06 修回日期:2018-01-30 出版日期:2018-05-20 发布日期:2018-06-01
  • 作者简介:金生吉(1973—),男,辽宁康平人,2009年毕业于东北大学,结构工程专业,博士,教授,主要从事桥隧工程结构分析与监测、新型复合建筑材料性能与应用研究。Email: shengjijin@sina.com。*通信作者: 陈华, Email: 1309874030@qq.com。
  • 基金资助:

    辽宁省自然科学基金项目(2015020583); 辽宁省教育厅基金项目(201564068)

Axial Force Monitoring and Numerical Simulation of Steel Supports in an Opencut Expressway Tunnel Foundation Pit

JIN Shengji1, CHEN Hua1,*, SHU Zhe1, 2, HE Lijuan1   

  1. (1. School of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, China; 2. MCC Capital Engineering & Research Incorporation Ltd., Beijing 100176, China)
  • Received:2017-12-06 Revised:2018-01-30 Online:2018-05-20 Published:2018-06-01

摘要:

为研究深基坑开挖过程中钢支撑轴力的变化情况,以沈阳市南北快速干线隧道深17.8 m基坑工程支护体系中横向钢支撑为研究对象,对基坑开挖过程中的轴力变化值进行现场实时监测,并采用有限元软件MIDAS/GTS对不同工况下的钢支撑轴力进行模拟研究,得出各道钢支撑的轴力云图及变化规律。结果表明: 1)随着基坑开挖深度的增加,坑壁主动土压力逐渐增大,使得每道钢支撑轴力在短期内均呈线性增长趋势; 2)同一断面钢支撑全部架设完成后轴力有所衰减,其原因之一是连续墙后的土体发生了流变现象,使得土体应力重新分配并达到新的平衡。

关键词: 公路隧道, 深基坑, 钢支撑, 轴力, 监测, 数值模拟

Abstract:

In order to study the variation laws of steel support axial force during excavation of a deep foundation pit of Shenyang NorthSouth Expressway Tunnel with burial depth of 17.8 m, the axial force of horizontal steel supports of the supporting system is studied. And then the realtime monitoring of axial force variation during excavation of foundation pit is conducted. Finally, the axial force of steel supports under different conditions is simulated by finite element software MIDAS/GTS, and the axial force nephograms and variation laws of every steel support are obtained. The results show that: (1) With the increase of excavation depth of the foundation pit, the active earth pressure on the foundation pit wall increases gradually, which makes the axial force of every support increase linearly in a short period. (2) The axial force of every steel support in a same crosssection attenuates after the whole erection of the steel supports, whose cause lays on soil stress redistributioncaused balance after rheology behavior of soil behind underground diaphragm wall.

Key words: expressway tunnel, deep foundation pit, steel support, axial force, monitoring, numerical simulation

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