| 盾构扩挖法建造地铁车站的桩-柱-预应力支撑体系参数研究 |
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| 引用本文： | 张新金,刘维宁,李海锋,路美丽,许世伟.盾构扩挖法建造地铁车站的桩-柱-预应力支撑体系参数研究[J].北京交通大学学报(自然科学版),2009,33(4). |
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| 作者姓名： | 张新金 刘维宁 李海锋 路美丽 许世伟 |
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| 作者单位： | 北京交通大学,土木建筑工程学院,北京,100044;北京市热力工程设计公司,北京,100027;中铁工程设计咨询集团有限公司,北京,100044 |
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| 基金项目： | 北京市科技计划项目资助(D0604003040921) |
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| 摘 要： | 盾构扩挖法建造地铁车站的施工方案的一个技术关键是在拆除部分管片之前对隧道结构进行加固.综合国内外对于管片破除时的加固措施,提出一种新型的支撑体系:桩-柱-预应力支撑体系.通过有限元分析对支撑体系中钢索预应力施加的位置和大小进行了研究.结果表明:管片开口部位的上下位置均需要施加预应力;远离管片开口部位的对面管片腰部也需要施加预应力,大小约为开口部位的10%;隧道外侧施做排桩有利于控制管片的纵向变形;在不超过混凝土设计强度的情况下,预应力越大,对管片纵向的约束越强.
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| 关 键 词： | 隧道 桩-柱-预应力支撑体系 盾构扩挖法 管片 有限元分析 |
Parameter Research of Pile-Column-Prestressing Support System of Metro Station Constructed by Enlarging Shield Tunnels |
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| ZHANG Xinjin,LIU Weining,LI Haifeng,LU Meili,XU Shiwei.Parameter Research of Pile-Column-Prestressing Support System of Metro Station Constructed by Enlarging Shield Tunnels[J].JOURNAL OF BEIJING JIAOTONG UNIVERSITY,2009,33(4). |
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| Authors: | ZHANG Xinjin LIU Weining LI Haifeng LU Meili XU Shiwei |
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| Institution: | 1.School of Civil Engineering;Beijing Jiaotong University;Beijing 100044;China;2.Beijing Heating Engineering Design Corporation;Beijing 100027;3.China Railway Engineering Consulting Group Co.Ltd;China |
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| Abstract: | Reinforcing the tunnel structures before segments are partly removed is a technical key of constructing metro station by enlarging shield tunnel combined with mining/open cut method.Based on the domestic and international reinforcing measures for removing the segments,a new support system is put forward,which is called Pile-Column-Prestressing Support System.The positions and values of prestressing forces exerted to the support system are studied with finite element analysis.These results indicate that pres... |
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| Keywords: | tunnels pile-column-prestressing support system enlarging shield tunnels segments finite element analysis |
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