基于块体理论的隧道围岩稳定性分析及支护方案优化
发布时间：2018-10-26 18:06
【摘要】：隧道围岩稳定性分析是隧道施工中的关键技术问题之一。块体理论在分析围岩稳定性方面较其他分析方法有其独特的优势,因而在岩体工程中得到广泛应用。然而,块体理论存在自身的缺陷,如何更好地将块体理论与数值分析方法结合对隧道围岩进行稳定性分析和支护设计,已成为地下工程中的热点研究问题之一。针对上述问题,本文作者依托深圳市葵坝路2号隧道工程,提出了基于块体理论的隧道围岩稳定性分析及支护方案优化这一课题,在已有研究工作的基础上,进行了系统的研究。(1)详细总结了隧道围岩稳定性分析的研究方法以及块体理论的研究现状,介绍了块体理论的基本原理。(2)根据隧道工程地质勘察资料结合隧道掌子面描述,选取三组具有代表性的结构面。利用块体理论结合结构面产状对深圳市葵坝路工程2号隧道左洞某区间段围岩进行分析,找出该区间段存在的块体,并对这些块体进行分析,从而找出其最大区域内的关键块体,计算其滑动面、滑动力以及安全系数。其中,对曲面块体的体积以及滑动面的面积采用分割法求解,力求其体积和面积与实际情况相符。(3)利用Unwedge程序计算得出该区间段块体的位置、体积以及安全系数,并与块体理论计算得出的解析解进行对比,证明Unwedge程序能很好的运用块体理论原理对隧道围岩稳定性进行分析；同时利用Unwedge程序对块体进行了不同情况下的支护,得到了该程序下最优的支护方案,并验证了设计支护方案的可行性。(4)利用块体理论计算得出的块体,采用FLAC3D数值分析方法对隧道开挖及支护优化进行了模拟。(5)通过数值分析方法模拟了隧道在有无块体情况的开挖过程,得到隧道拱顶及拱底在有无块体时的竖向位移。模拟了块体在二十四种支护方案下的竖向位移,并与设计支护方案进行了对比分析。本文采用先进的理论计算方法和手段,对隧道围岩稳定性分析及支护参数的优化进行了研究,具有较高的工程实用价值,为系统地分析隧道围岩稳定性及最优支护方案的选择提供了一种有效的分析手段。
[Abstract]:The stability analysis of tunnel surrounding rock is one of the key technical problems in tunnel construction. Block theory has a unique advantage over other analysis methods in analyzing the stability of surrounding rock, so it is widely used in rock mass engineering. However, the block theory has its own defects. How to better combine block theory with numerical analysis method to analyze the stability and support design of surrounding rock of tunnel has become one of the hot research problems in underground engineering. In view of the above problems, the author puts forward the problem of stability analysis and support scheme optimization of surrounding rock based on block theory, based on the No. 2 tunnel project of Kwai Ba Road in Shenzhen City. Based on the existing research work, the author puts forward the problem of the stability analysis of the surrounding rock and the optimization of the supporting scheme. The main contents are as follows: (1) the research methods of tunnel surrounding rock stability analysis and the research status of block theory are summarized in detail. The basic principle of block theory is introduced. (2) according to the tunnel engineering geological survey data and the description of tunnel face, three groups of representative structural planes are selected. By using block theory and structural plane occurrence, the surrounding rock of a section of left tunnel of No. 2 tunnel of Shenzhen Kwai Ba Road Project is analyzed, and the blocks existing in the section are found out, and these blocks are analyzed. The key blocks in the maximum area are found, and the sliding surface, sliding force and safety factor are calculated. The volume and area of the surface block and the area of the sliding surface are solved by the partition method. (3) the location, volume and safety factor of the block are calculated by Unwedge program. Compared with the analytical solution calculated by block theory, it is proved that Unwedge program can analyze the stability of surrounding rock of tunnel by using block theory. At the same time, the Unwedge program is used to support the block under different conditions, and the optimal support scheme is obtained, and the feasibility of designing the support scheme is verified. (4) the block is calculated by using block theory. The FLAC3D numerical analysis method is used to simulate the excavation and support optimization of the tunnel. (5) the excavation process of the tunnel with or without blocks is simulated by the numerical analysis method, and the vertical displacement of the tunnel arch roof and arch bottom with or without blocks is obtained. The vertical displacement of block under 24 support schemes is simulated and compared with the designed support scheme. In this paper, the stability analysis of tunnel surrounding rock and the optimization of supporting parameters are studied by using advanced theoretical calculation methods and means, which is of high practical value in engineering. It provides an effective analysis method for the stability of tunnel surrounding rock and the selection of optimal supporting scheme.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U451.2;U455.7
本文编号：2296539
[Abstract]:The stability analysis of tunnel surrounding rock is one of the key technical problems in tunnel construction. Block theory has a unique advantage over other analysis methods in analyzing the stability of surrounding rock, so it is widely used in rock mass engineering. However, the block theory has its own defects. How to better combine block theory with numerical analysis method to analyze the stability and support design of surrounding rock of tunnel has become one of the hot research problems in underground engineering. In view of the above problems, the author puts forward the problem of stability analysis and support scheme optimization of surrounding rock based on block theory, based on the No. 2 tunnel project of Kwai Ba Road in Shenzhen City. Based on the existing research work, the author puts forward the problem of the stability analysis of the surrounding rock and the optimization of the supporting scheme. The main contents are as follows: (1) the research methods of tunnel surrounding rock stability analysis and the research status of block theory are summarized in detail. The basic principle of block theory is introduced. (2) according to the tunnel engineering geological survey data and the description of tunnel face, three groups of representative structural planes are selected. By using block theory and structural plane occurrence, the surrounding rock of a section of left tunnel of No. 2 tunnel of Shenzhen Kwai Ba Road Project is analyzed, and the blocks existing in the section are found out, and these blocks are analyzed. The key blocks in the maximum area are found, and the sliding surface, sliding force and safety factor are calculated. The volume and area of the surface block and the area of the sliding surface are solved by the partition method. (3) the location, volume and safety factor of the block are calculated by Unwedge program. Compared with the analytical solution calculated by block theory, it is proved that Unwedge program can analyze the stability of surrounding rock of tunnel by using block theory. At the same time, the Unwedge program is used to support the block under different conditions, and the optimal support scheme is obtained, and the feasibility of designing the support scheme is verified. (4) the block is calculated by using block theory. The FLAC3D numerical analysis method is used to simulate the excavation and support optimization of the tunnel. (5) the excavation process of the tunnel with or without blocks is simulated by the numerical analysis method, and the vertical displacement of the tunnel arch roof and arch bottom with or without blocks is obtained. The vertical displacement of block under 24 support schemes is simulated and compared with the designed support scheme. In this paper, the stability analysis of tunnel surrounding rock and the optimization of supporting parameters are studied by using advanced theoretical calculation methods and means, which is of high practical value in engineering. It provides an effective analysis method for the stability of tunnel surrounding rock and the selection of optimal supporting scheme.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U451.2;U455.7
【参考文献】
相关期刊论文 前1条
1 夏才初;王隽;;小间距隧道围岩局部稳定性的块体理论分析[J];地下空间与工程学报;2009年06期
，本文编号：2296539
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