砂质新黄土隧道水平旋喷桩超前加固施工技术研究
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摘要
以蒙华铁路万荣隧道工程为例,采用三维数值计算方法,计算分析水平旋喷桩超前加固在砂质新黄土隧道施工中的可行性,隧道采用全断面开挖最不利工况下,模拟15 m水平旋喷桩进行超前加固,计算结果显示隧道掌子面塑性区长度明显减小,保证了隧道开挖过程掌子面的稳定;针对TY400和ST60两种钻机施作水平旋喷桩技术进行研究,优化确定施工参数及相应加固方案,并指出施工过程中的操作要点,研究提出在砂质新黄土隧道中水平旋喷桩超前加固施工技术。结果表明:隧道开挖时采用15 m水平旋喷桩加固掌子面后,在掌子面及周边形成了承载环,掌子面塑性区范围明显减小,提高了掌子面的整体稳定性,实现了万荣隧道的顺利贯通,水平旋喷桩超前加固技术在砂质新黄土地层加固效果明显,可为今后砂质新黄土地质条件下隧道工程的施工提供经验参考。
Taking the Wanrong tunnel project of Inner Mongolia-Jiangxi Railway as an example,the three-dimensional numerical calculation method is used to calculate and analyze the feasibility of advanced horizontal jet grouting pile reinforcement in the construction of sandy new loess tunnel.Under the most unfavorable conditions of tunnel full-section excavation,the 15 m horizontal jet grouting pile is simulated for advanced reinforcement.The calculation results show that the length in the plastic zone of the tunnel face is obviously reduced,which ensures the stability of the tunnel face during the excavation process.The horizontal jet grouting pile technology is applied with the TY400 and ST60 drills.For this purpose,it conducts a research to optimize the construction parameters and corresponding reinforcement schemes,and points out the operational points in construction.The research proposes the construction technology for horizontal jet grouting piles in the sandy new loess tunnel.The results show that after the tunnel excavation,the 15 m horizontal jet grouting pile is used to reinforce the tunnel face,and a bearing ring is formed on the tunnel face and around it.The plastic zone of the tunnel face is obviously reduced,which improves the overall stability,thus realizing the smooth implementation of the Wanrong Tunnel.The advanced reinforcement technology for the horizontal jet grouting pile has obvious reinforcement effects in the sandy new yellow soil layer,which could provide reference for the construction of tunnel engineering under the conditions of sandy new yellow loess.
Taking the Wanrong tunnel project of Inner Mongolia-Jiangxi Railway as an example,the three-dimensional numerical calculation method is used to calculate and analyze the feasibility of advanced horizontal jet grouting pile reinforcement in the construction of sandy new loess tunnel.Under the most unfavorable conditions of tunnel full-section excavation,the 15 m horizontal jet grouting pile is simulated for advanced reinforcement.The calculation results show that the length in the plastic zone of the tunnel face is obviously reduced,which ensures the stability of the tunnel face during the excavation process.The horizontal jet grouting pile technology is applied with the TY400 and ST60 drills.For this purpose,it conducts a research to optimize the construction parameters and corresponding reinforcement schemes,and points out the operational points in construction.The research proposes the construction technology for horizontal jet grouting piles in the sandy new loess tunnel.The results show that after the tunnel excavation,the 15 m horizontal jet grouting pile is used to reinforce the tunnel face,and a bearing ring is formed on the tunnel face and around it.The plastic zone of the tunnel face is obviously reduced,which improves the overall stability,thus realizing the smooth implementation of the Wanrong Tunnel.The advanced reinforcement technology for the horizontal jet grouting pile has obvious reinforcement effects in the sandy new yellow soil layer,which could provide reference for the construction of tunnel engineering under the conditions of sandy new yellow loess.
引文
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[7]王志丰,王亚琼,谢永利.单根水平旋喷桩施工引起地表隆起变形规律研究[J].中国公路学报,2016,29(7):117-123.
[8]王庆国,孙玉永.旋喷桩加固对控制盾构下穿铁路变形数值分析[J].地下空间与工程学报,2008(5):860-864.
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[10]赵洪波.大断面黄土隧道施工及工后沉降数值分析[J].西部探矿工程,2005(10):101-103.
[11]狄宏规,冷伍明,周顺华,等.朔黄重载铁路路基斜向高压旋喷桩加固效果[J].同济大学学报(自然科学版),2013,41(12):1818-1823.
[12]WONGSAROJ J,SOGA K,MAIR R J.Tunnelling-induced consolidation settlements in London Clay[J].Geote chnique,2013,63(13):1103.
[13]林安宁.水平旋喷超前预加固新技术在处理隧道坍塌方中的应用[J].兰州交通大学学报,2014,33(1):44-48.
[2]付亚雄,郑宏.软黏土地层顶管隧道掌子面稳定性数值研究[J].地下空间与工程学报,2017,13(S2):623-632.
[3]周振梁,谭忠盛,苏河修,等.隧道下穿富水软弱不均匀地层沉降控制技术研究[J].土木工程学报,2017,50(S2):153-159.
[4]关宝树.软弱围岩隧道变形及其控制技术[J].隧道建设,2011,31(1):1-17.
[5]吴应明,仲维玲.长大铁路隧道软弱围岩双层初支监测技术研究[J].铁道建筑技术,2018(5):85-87,118.
[6]赵涛.细砂层隧道水平旋喷桩超前预加固施工技术[J].施工技术,2018,47(14):44-47,82.
[7]王志丰,王亚琼,谢永利.单根水平旋喷桩施工引起地表隆起变形规律研究[J].中国公路学报,2016,29(7):117-123.
[8]王庆国,孙玉永.旋喷桩加固对控制盾构下穿铁路变形数值分析[J].地下空间与工程学报,2008(5):860-864.
[9]安关峰,张洪彬,刘添俊.旋喷群桩复合地基承载特性的数值分析[J].岩土力学,2012,33(3):906-912.
[10]赵洪波.大断面黄土隧道施工及工后沉降数值分析[J].西部探矿工程,2005(10):101-103.
[11]狄宏规,冷伍明,周顺华,等.朔黄重载铁路路基斜向高压旋喷桩加固效果[J].同济大学学报(自然科学版),2013,41(12):1818-1823.
[12]WONGSAROJ J,SOGA K,MAIR R J.Tunnelling-induced consolidation settlements in London Clay[J].Geote chnique,2013,63(13):1103.
[13]林安宁.水平旋喷超前预加固新技术在处理隧道坍塌方中的应用[J].兰州交通大学学报,2014,33(1):44-48.