超前预加固大断面隧道围岩稳定性影响因素研究
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摘要
以武广客运专线浏阳河隧道为工程背景,利用数值模拟、模型试验、现场试验等多种研究手段,对浅埋大断面隧道超前预加固工法围岩稳定性影响因素进行了全面系统地研究。超前预加固大断面隧道围岩稳定性影响因素研究具有重要的工程实际意义,填补我国超前预加固技术的空白,为浅埋大断面隧道施工提供理论指导。本文主要完成了以下研究工作：
1.综合研究超前预加固大断面隧道围岩稳定性影响因素、各因素对围岩稳定性影响大小及因素参数敏感性；
2.因素序列化研究得到掌子面变形影响因素序列从大到小为：掌子面超前预加固、围岩级别、工法、开挖进尺、棚式支护；拱顶变形影响因素序列从大到小为：围岩级别、工法、掌子面超前预加固、棚式支护、开挖进尺；
3.因素参数敏感性研究表明：在满足临界搭接长度情况下,掌子面超前加固敏感参数为：注浆效果；棚式支护参数变化对围岩变形影响较小；
4.新意法将掌子面稳定性分为A、B、C三个级别；本论文在新意法基础上,以铁路隧道围岩分级和断面尺寸为主要影响因素,提出新的掌子面稳定性分级方法和分级数；
5.在掌子面稳定性分级及超前预加固大断面隧道因素序列化研究的基础上,提出.超前预加固大断面隧道施工参数系列,为浅埋大断面隧道施工提供指导。
6.根据超前预加固大断面隧道施工参数系列,选取武广客运专线浏阳河隧道过河段最优施工参数,进行模型试验及现场试验验证；
本文研究成果基本形成了具有我国隧道工程特点的大断面隧道超前预加固技术,已成功应用于武广客运专线浏阳河隧道。
In the engineering background of Liuyang River tunnels on Passenger Dedicated Railway from Wuhan to Guangzhou, research was carried out synthetically and systematically on factors influencing rock stability of shallow advance strengthening tunnel with large cross-section, by use of numerical simulation, model tests, field trials and other research tools.
It was of great practical significance to research and develop on the pre-reinforcement method of shallow tunnel with large cross-section, to fill our country's gaps of the pre-reinforcement technology for shallow large-section tunnel and provide a theoretical guide for its construction. In this paper, the following research work was completed. 1. Comprehensive study on factors was conducted,including the contents and level of factors influencing rock stability of advance reinforced tunnel with large cross-section,and the parameter sensitivity.
2.Through the study of factors sequence, the descending factors sequence whice influnced working face deformation was obtained,which was tunnel face pre-reinforcement, rock-level, construction methods, excavation footage and shelf-type support. The one which influnced vault deformation were rock-level, construction method, tunnel face pre-reinforcement, shelf-type support,and excavation footage.
3.Parameter sensitivity study showed that grouting effect of working face was the only sensitive parameter of pre-reinforcement of GFRP anchor,in meeting the critical lap length. Shelf-type support parameters provide little effect on the surrounding rock deformation.
4. Tunnel face stability was divided into three levels of A,B and C in NITM. In this paper,the railway tunnel surrounding rock classification and section size were taken as the main factors to propose a new classification method and classification number of the tunnel face stabilization.
5. Based on the study of factors sequence and classification of the tunnel face stabilization, construction parameter series of advance reinforced tunnel with large cross-section were obtained to provide the reference basis for the construction of shallow tunnel with large cross-section for all grades of surrounding rock.
6.According to the parameter series of advance reinforeced tunnel with large cross-section, the best constuction parameters were obtained,which would be verified by model tests and field trials in the construction of Liuyang River tunnels on Passenger Dedicated Railway from Wuhan to Guangzhou.
This research basically formed with pre-reinforcement technique which had the characteristics of China's large-section tunnel.The results had been successfully applied in Liuyang River tunnels on Passenger Dedicated Railway from Wuhan to Guangzhou.
1.综合研究超前预加固大断面隧道围岩稳定性影响因素、各因素对围岩稳定性影响大小及因素参数敏感性；
2.因素序列化研究得到掌子面变形影响因素序列从大到小为：掌子面超前预加固、围岩级别、工法、开挖进尺、棚式支护；拱顶变形影响因素序列从大到小为：围岩级别、工法、掌子面超前预加固、棚式支护、开挖进尺；
3.因素参数敏感性研究表明：在满足临界搭接长度情况下,掌子面超前加固敏感参数为：注浆效果；棚式支护参数变化对围岩变形影响较小；
4.新意法将掌子面稳定性分为A、B、C三个级别；本论文在新意法基础上,以铁路隧道围岩分级和断面尺寸为主要影响因素,提出新的掌子面稳定性分级方法和分级数；
5.在掌子面稳定性分级及超前预加固大断面隧道因素序列化研究的基础上,提出.超前预加固大断面隧道施工参数系列,为浅埋大断面隧道施工提供指导。
6.根据超前预加固大断面隧道施工参数系列,选取武广客运专线浏阳河隧道过河段最优施工参数,进行模型试验及现场试验验证；
本文研究成果基本形成了具有我国隧道工程特点的大断面隧道超前预加固技术,已成功应用于武广客运专线浏阳河隧道。
In the engineering background of Liuyang River tunnels on Passenger Dedicated Railway from Wuhan to Guangzhou, research was carried out synthetically and systematically on factors influencing rock stability of shallow advance strengthening tunnel with large cross-section, by use of numerical simulation, model tests, field trials and other research tools.
It was of great practical significance to research and develop on the pre-reinforcement method of shallow tunnel with large cross-section, to fill our country's gaps of the pre-reinforcement technology for shallow large-section tunnel and provide a theoretical guide for its construction. In this paper, the following research work was completed. 1. Comprehensive study on factors was conducted,including the contents and level of factors influencing rock stability of advance reinforced tunnel with large cross-section,and the parameter sensitivity.
2.Through the study of factors sequence, the descending factors sequence whice influnced working face deformation was obtained,which was tunnel face pre-reinforcement, rock-level, construction methods, excavation footage and shelf-type support. The one which influnced vault deformation were rock-level, construction method, tunnel face pre-reinforcement, shelf-type support,and excavation footage.
3.Parameter sensitivity study showed that grouting effect of working face was the only sensitive parameter of pre-reinforcement of GFRP anchor,in meeting the critical lap length. Shelf-type support parameters provide little effect on the surrounding rock deformation.
4. Tunnel face stability was divided into three levels of A,B and C in NITM. In this paper,the railway tunnel surrounding rock classification and section size were taken as the main factors to propose a new classification method and classification number of the tunnel face stabilization.
5. Based on the study of factors sequence and classification of the tunnel face stabilization, construction parameter series of advance reinforced tunnel with large cross-section were obtained to provide the reference basis for the construction of shallow tunnel with large cross-section for all grades of surrounding rock.
6.According to the parameter series of advance reinforeced tunnel with large cross-section, the best constuction parameters were obtained,which would be verified by model tests and field trials in the construction of Liuyang River tunnels on Passenger Dedicated Railway from Wuhan to Guangzhou.
This research basically formed with pre-reinforcement technique which had the characteristics of China's large-section tunnel.The results had been successfully applied in Liuyang River tunnels on Passenger Dedicated Railway from Wuhan to Guangzhou.
引文
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[20]杨正保.隧洞掘进超前支护技术研究.武汉大学硕士学位论文,2005.
[21]朱永全.隧道稳定性位移判别准则.中国铁道科学,2001,22(6)
[22]于学馥.非确定性科学决策方法.北京,科学出版社,2000.
[23]李志业,曾艳华.地下结构设计原理与方法.西南交通大学出版社,2003.
[24]刘波,韩彦辉.FLAC原理、实例与应用指南[M].人民交通出版社,2005.
[25]贾新,玻璃纤维增强塑料锚杆锚固机理研究.同济大学硕士学位论文,2005.
[26]高丹盈,朱海堂,谢晶晶.纤维增强塑料筋锚杆及其应用.岩石力学与工程学报,2004,23(13).
[27]孔恒,马念杰,王梦恕.岩体锚固系统的串、并联模型及可靠度分析.煤炭学报,2002,27(4)
[28]张丽,胡文斌.影响坑道围岩稳定性的因素.江西测绘,2007,70(4)
[29]Mair.R.J. Settlement effects of bored tunnels. Geotechnical Aspects of Underground Construction in Soft Ground,1996:43-53
[30]Calvello.M,Taylor.R.N.Centrifuge modeling of a spile-reinforced tunnel heading. Geotechnical Aspect of Underground Construction in Soft Ground,2000,344-345
[31]Yoo,C.S,Shin,H.K.Behavior of tunnel face pre-reinforced with sub-horizontal pipes.Geotechnical Aspect of Underground Construction in Soft Ground,2000,463-468
[32]HOEK E., BRAY J.W.. Rock slope engineering. Institution of Mining and Metallurgy, London 1981
[33]贾新,袁勇,李焯芬.新型玻璃纤维增强塑料砂浆锚杆的黏结性能试验研究.岩石力学与工程学报,2006,25(10).
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[36]刘汉东等.GFRP锚杆拉伸力学性能试验.岩石力学与工程学报,2005,24(20).
[37]陈勤树,岩体注浆加固的理论与实例.
[38]吉小明,石明霞.浅埋暗挖隧道围岩预加固机理及稳定性分析.现代隧道技术, 2008年增刊。
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