【作者】 项志敏；

【导师】 刘宝琛； 李亮；

【作者基本信息】 中南大学 ， 桥梁与隧道工程， 2012， 博士

【摘要】 浏阳河隧道是我国第一条采用铣挖法及预加固技术穿越河流及市区的客运专线隧道,其具有山岭隧道和城市地下工程施工的诸多特点。隧道围岩稳定性分析及相关施工技术研究是目前的工程热点和难点之一。城市过江隧道不仅具有一般隧道的施工的特点,而且还对地表沉降控制更加严格。因此,城市过江隧道施工过程中掌子面和围岩的稳定性是控制地表沉降的关键步骤之一。稳定的围岩和安全的支护措施将为掌子面施工隧道开挖提供基本保证。基于此,本文以武广高铁浏阳河隧道的围岩稳定性分析及掌子面加固等施工技术为出发点,采用理论分析、实验研究及数值模拟,获得的研究成果如下：(1)基于Hoek-Brown广义非线性强度准则和非相关联流动准则,构建了倾斜地表浅埋隧道围岩稳定性分析破坏模式,通过修正非线性岩土材料的瞬时内摩擦角和粘聚力引入关联-非关联流动法则,运用极限分析上限法和强度折减技术研究了耦合非线性破坏准则和非相关联流动准则对浅埋隧道围岩压力和稳定性的影响。研究成果可为浅埋隧道支护结构的优化设计和围岩稳定性分析提供有益参考。(2)基于Hoek-Brown广义非线性强度准则,将隧道开挖视为平面应变问题,锚杆施加在围岩上的力视为径向应力,建立了围岩施加锚杆前后的围岩稳定性分析微分方程,获得了隧道围岩施加锚杆前后的应力场、位移场及塑性区半径和锚杆极限荷载的计算方法。参数分析和工程应用表明该理论计算方法具有一定的工程应用价值。上述成果指导了浏阳河隧道围岩锚杆支护参数的确定。(3)形成了客运专线大断面隧道铣挖法施工工艺及工法、铣挖法施工铣挖设备选型及其机械作业配套模式,显著提高了铣挖工法效率。(4)基于浏阳河隧道特殊的地质环境条件,开展了掌子面预加固技术的研究。明确了围岩开挖后的三种成拱效应,建立了相应掌子面稳定性分类体系；开展了浏阳河隧道掌子面预加固技术的室内模型实验和现场实验研究,提出了掌子面玻璃纤维锚杆预加固关键技术、超前核心土及掌子面变形的监控量测方法。更多还原

【Abstract】 LiuYang River Tunnel, a passenger special line tunnel crossing the river and urban, is the first tunnel which milling excavation method and pre-reinforcement technology have been applied.It has many features of the construction method of tunnel and urban underground engineering.The stability analysis of tunnel surrounding rock and related research of construction technology engineering are one of the difficulties but also a hotspot in current engineering.Urban River Tunnel not only has the features of general tunnel construction, but also has more exigent reins on surface settlement. Therefore, the stability of the surrounding rock and tunnel face in the tunnel construction process is a key step to control surface settlement. The stable surrounding rock and safety support measures provide a fundamental guarantee for tunnel face excavation in the tunnel construction process.For the above-mentioned reasons, this article is based on the stability analysis of tunnel surrounding rock and the research of construction technology engineering of LiuYang River Tunnel on Wuhan-Guangzhou High-speed Railway, theoretical analysis, experimental study and numerical simulation have been used in this paper, the contributions are as follows:(1)A failure model of the stability analysis of shallow tunnel surrounding rock in inclined ground surface has been built based on the Hoek-Brown generalized nonlinear strength criterion and nonassociated flow rule, associated-nonassociated flow rule is introduced by modify the instantaneous internal friction angle and cohesive strength of nonlinear geological materials. Upper bound theorem of limit analysis and strength reduction technique have been applied to study the effects of non-linear failure criterion and nonassociated flow rule on the surrounding rock pressure and stability of the shallow tunnel. The research results can offer beneficial reference in the optimal design of shallow tunnel support structure and the stability analysis of surrounding rock.(2) Based on the Hoek-Brown generalized nonlinear strength criterion, took the excavation of the tunnel as a plane strain problem and the force of the anchor applied on the surrounding rock as radial stress, stability analysis of differential equations before and after anchor was applide on the surrounding rock were established, the calculation method of the stress field before and after tunnel surrounding rock apply anchor, displacement field and plastic zone radius and anchor ultimate load were obtained. Parameter analysis and engineering application show that the theoretical calculation method has some value in engineering application. These achievements have been guided the anchor supporting parameters of surrounding rock in Liu Yang River Tunnel.(3) Forming a matching mode of milling excavation method of large cross section tunnel passenger dedicated line, selection of milling digging equipment and its machinery works, the efficiency of milling excavation method is improved significantly.(4) Pre-reinforcement of the tunnel face is studied based on the special geological environment conditions of Liu Yang River Tunnel, three arching effects after surrounding rock excavated are explicated, stability classification system of the tunnel face is builded; indoor model experiment and field experiments of pre-reinforcement of the tunnel face of Liuyang river tunnel are studied, the critical technologies of pre-reinforcement of glass fiber bolt in tunnel face and the methods of monitoring and measuring the deformation of advance core soil and tunnel face are proposed.更多还原