| 洞桩法大断面群洞交叉隧道初衬数值模拟 |
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| 引用本文： | 瞿万波,刘新荣,傅晏,秦晓英.洞桩法大断面群洞交叉隧道初衬数值模拟[J].岩土力学,2009,30(9):2799-2804. |
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| 作者姓名： | 瞿万波 刘新荣 傅晏 秦晓英 |
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| 作者单位： | 1. 重庆大学,土木工程学院,重庆,400045;重庆工程职业技术学院,重庆,400037
2. 重庆大学,土木工程学院,重庆,400045 |
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| 基金项目： | 国家自然科学基金重点项目 |
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| 摘 要： | 针对采用洞桩法施工的北京地铁10号线工体北路站大断面群洞交叉隧道，介绍了洞桩法大断面群洞交叉隧道施工步序，分析了交叉口衬砌工作的力学机理，采用三维有限元数值模拟方法对其初衬结构力学行为进行研究。结果表明：洞桩法交叉隧道交叉口区域两个方向的衬砌受力存在相互影响，但影响的范围不大，衬砌拱顶沉降总体上表现出中间大，两端小的特征；主线隧道拱部受后期联络通道扣拱的影响，在与联络通道的相交部位出现了受拉状态，产生了与主线其他部位不同的受力特征；交叉口变高部位设置折梁能有效扩散联络通道扣拱时产生的压力，减轻了应力集中程度。研究结论可供洞桩交叉隧道的施工与设计参考。
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| 关 键 词： | 洞桩法 交叉隧道 初期支护 地铁车站 |
| 收稿时间： | 2008-02-18 |
Numerical simulation of preliminary lining of large section crossing tunnels constructed with PBA method |
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| QU Wan-bo,LIU Xin-rong,FU Yan,QIN Xiao-ying.Numerical simulation of preliminary lining of large section crossing tunnels constructed with PBA method[J].Rock and Soil Mechanics,2009,30(9):2799-2804. |
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| Authors: | QU Wan-bo LIU Xin-rong FU Yan QIN Xiao-ying |
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| Institution: | 1. College of Civil Engineering, Chongqing University, Chongqing 400045, China; 2. Chongqing Vocational Institute of Engineering, Chongqing 400037, China |
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| Abstract: | Based on the North Gongti Road Station of Beijing Metro line 10, the construction steps and mechanism of large section crossing tunnels constructed with the pile-beam-arch (PBA) tunneling method were described. The behaviors of preliminary lining of tunnels was analyzed using FEM. The results showed that the preliminary support system of tunnels worked interactively restricted within certain area and the tunnel crown settlement decreased from junction area to both sides. With the influence of latterly constructed arch, the tunnel crown of the main tunnel jointed with the vertical tunnel manifested tensile state. The folding beam settled in the tunnel junction could diffuse the pressure of upper arch and weaken the stress concentration. The results could be a reference to design and construction of crossing tunnels constructed with PBA tunneling method. |
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| Keywords: | pile-beam-arch (PBA) tunneling method crossing tunnels preliminary lining metro station |
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