极高地应力软弱围岩变形特征及控制技术研究
发布时间：2018-08-13 15:15
【摘要】：随着修建隧道数量的日益增多,隧道穿越软弱围岩地层时遇到的大变形灾害问题日益突出,经常有初支变形过大、开裂,甚至二衬开裂掉块的现象发生。本文以关垭子隧道工程为背景,采用现场调查、室内试验、理论分析、监控量测和数值模拟的手段,研究了极高地应力下软弱绢云母千枚岩大变形的机理,并确定了关垭子隧道的最优施工方法。主要结论如下：1、分析了关垭子隧道围岩的矿物成分,并确定了围岩的力学参数,以此判定关垭子隧道围岩属于极高地应力状态下的软弱围岩。2、结合关垭子隧道现场监控量测数据,对隧道大变形段的变形规律进行了总结分析,该隧道具有径向变形明显,变形的不对称性,变形时间长、收敛慢,变形量大、变形速度快、变形范围广的特征。并从地质构造、围岩岩性、地应力、地下水及施工方法等方面探讨了该隧道发生大变形的机理。3、采用数值模拟的方法,从变形控制、支护结构受力等方面对三台阶七步法、预留核心土台阶法、CRD法、双侧壁导坑法和新意法进行了对比分析,确定了新意法是最适合关垭子隧道的施工方法,并从变形控制、支护结构受力及其安全系数几个方面对新意法进行了改进优化,得出了对掌子面进行全断面超前加固分台阶开挖,加固区长15m、一次开挖进尺1 m为最适合关垭子隧道的施工方法。
[Abstract]:With the increasing number of tunnels, the problem of large deformation disasters encountered in tunnels passing through soft surrounding rock is becoming more and more serious. The phenomenon of excessive deformation of initial branches, cracking and even cracking of the second lining often occurs. In this paper, the mechanism of large deformation of soft sericite phyllite under extremely high ground stress is studied by means of field investigation, laboratory test, theoretical analysis, monitoring measurement and numerical simulation. The optimal construction method of Guanyazi Tunnel is determined. The main conclusions are as follows: 1. The mineral composition of the surrounding rock of Guanyazi Tunnel is analyzed, and the mechanical parameters of the surrounding rock are determined. Based on this, it is determined that the surrounding rock of Guanyazi Tunnel belongs to the weak surrounding rock of extremely high ground stress. Combined with the monitoring data of Guanyazi Tunnel, the deformation law of the large deformation section of the tunnel is summarized and analyzed. The tunnel has obvious radial deformation. Asymmetry of deformation, long deformation time, slow convergence, large amount of deformation, fast deformation speed and wide range of deformation. The mechanism of large deformation of the tunnel is discussed from geological structure, surrounding rock lithology, in-situ stress, groundwater and construction method. The three-step and seven-step method is used to control deformation and force of supporting structure by numerical simulation. By comparing and analyzing the CRD method, double sidewall guide pit method and Xinyi method, it is determined that Xinyi method is the most suitable construction method for Guanyazi tunnel, and the deformation control is also carried out from the point of view of deformation control. This paper improves and optimizes the Xinyi method in several aspects of the force and safety factor of the supporting structure, and obtains the excavation of step by step for the full section advance reinforcement of the face. The construction method of Guanya-Zi tunnel is that the reinforcement area is 15m and the excavation advance is 1 m at a time.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.49
本文编号：2181366
[Abstract]:With the increasing number of tunnels, the problem of large deformation disasters encountered in tunnels passing through soft surrounding rock is becoming more and more serious. The phenomenon of excessive deformation of initial branches, cracking and even cracking of the second lining often occurs. In this paper, the mechanism of large deformation of soft sericite phyllite under extremely high ground stress is studied by means of field investigation, laboratory test, theoretical analysis, monitoring measurement and numerical simulation. The optimal construction method of Guanyazi Tunnel is determined. The main conclusions are as follows: 1. The mineral composition of the surrounding rock of Guanyazi Tunnel is analyzed, and the mechanical parameters of the surrounding rock are determined. Based on this, it is determined that the surrounding rock of Guanyazi Tunnel belongs to the weak surrounding rock of extremely high ground stress. Combined with the monitoring data of Guanyazi Tunnel, the deformation law of the large deformation section of the tunnel is summarized and analyzed. The tunnel has obvious radial deformation. Asymmetry of deformation, long deformation time, slow convergence, large amount of deformation, fast deformation speed and wide range of deformation. The mechanism of large deformation of the tunnel is discussed from geological structure, surrounding rock lithology, in-situ stress, groundwater and construction method. The three-step and seven-step method is used to control deformation and force of supporting structure by numerical simulation. By comparing and analyzing the CRD method, double sidewall guide pit method and Xinyi method, it is determined that Xinyi method is the most suitable construction method for Guanyazi tunnel, and the deformation control is also carried out from the point of view of deformation control. This paper improves and optimizes the Xinyi method in several aspects of the force and safety factor of the supporting structure, and obtains the excavation of step by step for the full section advance reinforcement of the face. The construction method of Guanya-Zi tunnel is that the reinforcement area is 15m and the excavation advance is 1 m at a time.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.49
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