【作者】 旷文涛；

【导师】 漆泰岳；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2010， 硕士

【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。更多还原

【Abstract】 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.更多还原