涌水大跨分岔式隧道施工关键技术研究
摘要：以阳安二线直通线包湾村隧道工程为背景,介绍了一套完整的分岔大跨隧道施工技术,对开挖方法确定、分岔段及渐变段施工等关键控制技术进行了详细阐述。通过对加宽断面处数值模拟,分析了加宽断面开挖时的隧道围岩变形、衬砌结构应力分布。实践表明:断面加宽处面积突然增大,施工对围岩的扰动区域增大,应力释放过程加快,释放的围岩压力增加,导致累积变形量增大,衬砌受力增大;对于分岔大跨度,在环境复杂、地质条件差的情况下采取适当的地层加固措施,不同断面的合理渐变、超大断面的合理分块、保留临时支撑施作二次衬砌等技术切实有效。
关键词：隧道工程分岔式隧道大跨加宽断面数值模拟二次衬砌
尊敬的用户，本篇文章需要20元，点击支付交费后阅读
限时优惠福利：领取VIP会员
全年期刊、VIP视频免费!
全年期刊、VIP视频免费!
参考文献[1] 黄欣,贾宝新,李祁,等．地铁盾构分岔式隧道数值模拟及应用[J]．辽宁工程技术大学学报(自然科学版),2013,32(7):943-946．
[2] 荆永军,樊至,欧阳刚杰,等．长沙营盘路湘江隧道分岔大跨施工技术[J]．隧道建设,2013,33(3):231-236．
[3] 张强勇,李术才,李勇,等．大型分岔隧道围岩稳定与支护三维地质力学模型试验研究[J]．岩石力学与工程学报,2007(S2):4051-4059．
[4] 刘鹏．胶州湾隧道浅埋分岔段的设计及施工关键技术[J]．隧道建设,2013,33(6):474-480．
[5] 吉小明,谭文．浅埋暗挖大跨隧道中的施工力学原理与施工技术研究[J]．隧道建设,2010,30(S1):94-99．
[6] 张淼．硬岩分岔式隧道施工技术在高速公路施工建设中的应用[J]．科技创业家,2013(6):20．
[7] 李书万．分岔式隧道设计施工的关键技术研究[J]．城市建设理论研究(电子版),2016(35):133-134．
[8] 张富鹏,雷胜友,杨瑞,等．超小净距分岔式隧道施工方法数值模拟研究[J]．中国科技论文,2019,14(2):157-163,209．
[9] 丁浩,李勇,程崇国,等．拍盘分岔式特长隧道土建工程设计[J]．公路交通技术,2009(6):102-105．
[10] 贺晓铭．偏压连拱-分岔式隧道施工力学效应研究[D]．重庆:重庆交通大学,2019.
[2] 荆永军,樊至,欧阳刚杰,等．长沙营盘路湘江隧道分岔大跨施工技术[J]．隧道建设,2013,33(3):231-236．
[3] 张强勇,李术才,李勇,等．大型分岔隧道围岩稳定与支护三维地质力学模型试验研究[J]．岩石力学与工程学报,2007(S2):4051-4059．
[4] 刘鹏．胶州湾隧道浅埋分岔段的设计及施工关键技术[J]．隧道建设,2013,33(6):474-480．
[5] 吉小明,谭文．浅埋暗挖大跨隧道中的施工力学原理与施工技术研究[J]．隧道建设,2010,30(S1):94-99．
[6] 张淼．硬岩分岔式隧道施工技术在高速公路施工建设中的应用[J]．科技创业家,2013(6):20．
[7] 李书万．分岔式隧道设计施工的关键技术研究[J]．城市建设理论研究(电子版),2016(35):133-134．
[8] 张富鹏,雷胜友,杨瑞,等．超小净距分岔式隧道施工方法数值模拟研究[J]．中国科技论文,2019,14(2):157-163,209．
[9] 丁浩,李勇,程崇国,等．拍盘分岔式特长隧道土建工程设计[J]．公路交通技术,2009(6):102-105．
[10] 贺晓铭．偏压连拱-分岔式隧道施工力学效应研究[D]．重庆:重庆交通大学,2019.
Research on Key Technology for Construction of Gushing Large-span Bifurcation Tunnel
Abstract: Taking Baowancun Tunnel project of Yang'an Second Line Direct Line as the background,a complete set of bifurcation large-span tunnel construction technology is introduced,and key control technologies such as the determination of the excavation method,the construction of the bifurcation section and the transition section are described in detail. And through the numerical simulation of the widened section,the tunnel surrounding rock deformation and the stress distribution of the lining structure when the widened section is excavated are analyzed. Practice shows that the cross-sectional area suddenly increases at the widening of the cross-section,the area of disturbance to the surrounding rock by the construction increases,the stress release process is accelerated,and the released surrounding rock pressure increases,resulting in an increase in the cumulative deformation and an increase in the force on the lining; for a large span,appropriate stratum reinforcement measures are taken in the case of complex environment and poor geological conditions,reasonable gradation of different sections,reasonable division of super-large sections,and techniques such as retaining temporary supports for secondary lining are practical and effective.
Keywords: tunnels; bifurcated tunnels; large\|span; widened section; simulation; secondary lining
954
0
0