大断面暗挖平顶直墙结构密贴下穿既有线沉降控制关键技术被引量：15

Key techniques of settlement control for large section mined tunnel with horizontal proof and straight wall closely crossing underneath the existing tunnel

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摘要以某地铁1号线卫星广场站大断面暗挖平顶直墙结构密贴下穿既有线为工程背景,介绍了6导洞的洞桩+洞柱法结合的施工方案.分析总结了下穿过程中的沉降控制关键技术:超前预注浆、注浆抬升、顶升动态沉降控制、初支和二衬背后注浆.监测结果表明:既有线底板最大沉降为8.9mm,变形缝处差异沉降最大值4.5 mm,轨道沉降值最大值为2.8 mm,成功实现了安全下穿既有线. Based on the case of Weixingguangchang station which is a newly-built large section mined subway station in line 1 of the subway closely crossing through the bottom of the existing tunnel with flat roof and upright wall , the construction schemes of 6 pilot tunnels excavated by pile-beam-arch （PBA） method and tunnel-column method are introduced. The key techniques on controlling settlement of the existing tunnel are analyzed and summarized, which including the leading grouting, heaving of the existing tunnel by grouting, jacking the existing tunnel by jacks, post grouting around lining. Monitoring data show that the maximal settlement of the existing tunnel is controlled in 8.9 mm, the maximal differential settlement cracks is controlled in 4.5 mm, and the maximal track settlement is controlled in 2.8 mm. With these control measures, the existing tunnel has been operated safely during construction.

作者李利王永红柏林

机构地区中铁隧道勘测设计院有限公司北京交通大学隧道及地下工程教育部工程研究中心

出处《北京交通大学学报》 CAS CSCD 北大核心 2016年第2期114-119,共6页 JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基金国家自然科学基金资助项目(51478037)

关键词隧道工程大断面暗挖平顶直墙结构密贴下穿既有线沉降控制关键技术 tunnel engineering large section mined tunnel tunnel with flat roof and upright wall closely crossing under the existing tunnel key techniques of controlling settlement

分类号 U45 [建筑科学—桥梁与隧道工程]

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参考文献2

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