小净距大断面双洞隧道台阶法施工对围岩的稳定性研究
发布时间：2018-07-18 09:50
【摘要】：随着我国经济的高速发展,考虑我国国土面积之大,地区地理情况高低起伏,尤其在一些地方山岭较多,为方便地方经济、物质、文化的交流,修建隧道已成为解决这类问题的首选方法。分离式隧道在发展工程中得到较为广泛的应用,但是隧道净距难以通过规范进行最为合理的确定。净距过大容易造成占地面积大,养护不方便等一些列问题,这样小净距隧道和连拱式隧道应运而生,但连拱隧道施工工期较长,工艺复杂,且存在漏水、中墙出现裂缝等问题,因此该结构型式的应用受到广泛质疑。小净距隧道可以较好地解决双洞的接线问题,同时有效的避免连拱式隧道,工期长,工艺复杂,造价高等问题,因此小净距隧道在山区隧道施工得到广泛的应用。本文利用戴云山隧道为背景,利用理论分析,数值模拟等方法对小净距双洞隧道施工方法(台阶法),中岩墙厚度,不同围岩级别进行研究。利用有限元模拟软件MIDAS GTS NX对不同级围岩,不同厚中岩墙,双洞不同进深施工进度等进行模拟,通过激活和钝化单元,来进行模拟开挖的过程,观察隧道的围岩变形,应力应变,塑性区大小,得出合理的开挖方式,合理的净距。通过模拟我们发现,在拱腰处一般会出现较大应力,在拱顶处和仰拱处会出现较大竖向位移,拱顶处竖向位移数值大于仰拱处；台阶法施工在不同围岩条件下,无论台阶长度如何变化,两隧道施工进度差越小,中岩墙厚度越小,对围岩稳定性的影响越大,变形相对增大。
[Abstract]:With the rapid development of our country's economy, considering the large area of our country and the high and low geographical conditions of the region, especially in some places, the construction of tunnel has become the first choice for the convenience of local economy, material and culture, and the construction of the tunnel has been widely used in the development project, but it has been widely used in the development project. It is difficult to make the most reasonable determination of the net distance of the tunnel through the standard. It is easy to cause the large area of the area and the inconvenient maintenance of the tunnel. So the small distance tunnel and the continuous arch tunnel emerge as the times require, but the construction time of the tunnel is long, the process is complicated, and the cracks in the middle wall exist, so the structure type is formed. The application has been widely questioned. Small net distance tunnel can solve the problem of double hole wiring better, and effectively avoid arch tunnel, long construction time, complex process and high cost. So the small distance tunnel is widely used in the construction of mountain tunnel. This paper uses the Dai Yun mountain tunnel as the background, uses theoretical analysis, numerical simulation and so on. Methods to study the construction method of small net distance double tunnel (step method), the thickness of the middle rock wall and the different surrounding rock grade. Using the finite element simulation software MIDAS GTS NX to simulate the construction progress of different grade rock, different thick middle rock wall and double hole deep construction, through activation and passivation units, the process of simulating excavation is carried out to observe the tunnel. The surrounding rock deformation, stress strain, plastic zone size, reasonable excavation method and reasonable spacing are obtained. Through simulation we find that large stress will appear at the arch and the greater vertical displacement at the vault and arch, and the vertical displacement at the vault is greater than the inverted arch; step method is constructed under different surrounding rock conditions, no matter the platform. When the length of the tunnel is changed, the smaller the two tunnel construction schedule is, the smaller the thickness of the middle rock wall is, the greater the influence on the stability of the surrounding rock will be and the larger the deformation will be.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.4;U451.2
[Abstract]:With the rapid development of our country's economy, considering the large area of our country and the high and low geographical conditions of the region, especially in some places, the construction of tunnel has become the first choice for the convenience of local economy, material and culture, and the construction of the tunnel has been widely used in the development project, but it has been widely used in the development project. It is difficult to make the most reasonable determination of the net distance of the tunnel through the standard. It is easy to cause the large area of the area and the inconvenient maintenance of the tunnel. So the small distance tunnel and the continuous arch tunnel emerge as the times require, but the construction time of the tunnel is long, the process is complicated, and the cracks in the middle wall exist, so the structure type is formed. The application has been widely questioned. Small net distance tunnel can solve the problem of double hole wiring better, and effectively avoid arch tunnel, long construction time, complex process and high cost. So the small distance tunnel is widely used in the construction of mountain tunnel. This paper uses the Dai Yun mountain tunnel as the background, uses theoretical analysis, numerical simulation and so on. Methods to study the construction method of small net distance double tunnel (step method), the thickness of the middle rock wall and the different surrounding rock grade. Using the finite element simulation software MIDAS GTS NX to simulate the construction progress of different grade rock, different thick middle rock wall and double hole deep construction, through activation and passivation units, the process of simulating excavation is carried out to observe the tunnel. The surrounding rock deformation, stress strain, plastic zone size, reasonable excavation method and reasonable spacing are obtained. Through simulation we find that large stress will appear at the arch and the greater vertical displacement at the vault and arch, and the vertical displacement at the vault is greater than the inverted arch; step method is constructed under different surrounding rock conditions, no matter the platform. When the length of the tunnel is changed, the smaller the two tunnel construction schedule is, the smaller the thickness of the middle rock wall is, the greater the influence on the stability of the surrounding rock will be and the larger the deformation will be.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.4;U451.2
【参考文献】
相关期刊论文 前6条
1 徐正齐;李海波;;小净距隧道进口浅埋偏压段施工技术[J];安徽建筑;2007年01期
2 彭t，
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