| 近距离下穿在建地铁隧道施工爆破变形及控制方法研究 |
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| 引用本文： | 李术才,李克先,雷刚,孙国富.近距离下穿在建地铁隧道施工爆破变形及控制方法研究[J].岩土力学,2014,35(Z2):284-289. |
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| 作者姓名： | 李术才 李克先 雷刚 孙国富 |
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| 作者单位： | 1.山东大学 岩土与结构工程研究中心，济南 250061；2.北京城建设计发展集团股份有限公司，北京 100000 |
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| 摘 要： | 近距离爆破下穿尚未完成二衬的区间隧道是一种较为特殊的工况,涉及初支破坏、既有隧道下沉等诸多问题。以青岛地铁2号线近距离(250mm)下穿刚完成初支的3号线隧道工程设计及施工为实例,通过在施工时采用自进式管棚、拱顶部位掏空、辅助中孔掏槽、对既有隧道施加张拉力、限载限行等多项措施,并根据类比给出合理的爆破振速控制指标,控制爆破振速及隧道变形。运用有限元分析软件MIDAS-GTS进行三维模型数值分析,揭示在建隧道爆破施工对既有隧道变形及内力变化规律。经过理论计算与实测分析,采取的各项措施能够达到预期的效果,3号线初支结构未见异常,其研究成果对特殊条件下的爆破下穿设计与施工具有参考价值。
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| 关 键 词： | 爆破开挖 下穿 爆破振动 减震 变形控制 |
| 收稿时间： | 2014-04-30 |
Study of blasting vibration and deformation control for metro construction beneath existing metro tunnel in short distance |
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| LI Shu-cai,LI Ke-xian,LEI Gang,SUN Guo-fu.Study of blasting vibration and deformation control for metro construction beneath existing metro tunnel in short distance[J].Rock and Soil Mechanics,2014,35(Z2):284-289. |
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| Authors: | LI Shu-cai LI Ke-xian LEI Gang SUN Guo-fu |
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| Institution: | 1. Research Center of Geotechnical & Structural Engineering, Shandong University, Jinan 250061, China; 2. Beijing Urban Construction Design & Development Group Company Limited, Beijing 100000, China |
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| Abstract: | Near blasting beneath the just completed primary support line is a special condition; it relates to many problems such as the primary support failure and subsidence. A design and construction example of an engineering of the Qingdao Metro Line 2 close (250 mm) beneath the just completed primary support line 3 tunnel, is employed, controlling vibration and deformation with measures such as the self-feeding pipe shed, tunneling crown, assisted middle hole cut, applied tensile force for the existing tunnel load, and reasonable blasting vibration control indexes are proposed according to analogy. The variation law of deformation and internal force of existing tunnel in building construction is revealed by using the finite element analysis software MIDAS-GTS for numerical analysis of 3D model. The measures taken achieve the desired effect. Primary support structure of the line 3 has no abnormal, through theoretical calculation and experimental analysis. Research results have an important reference value to blasting under special condition in design and construction. |
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| Keywords: | blasting excavation underneath pass blasting vibration shock absorption deformation control |
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