隧道下穿高速公路段管棚预支护技术及其效应研究

发布时间：2018-04-20 21:01

本文选题：管棚超前支护 + 隧道施工　；参考：《安徽理工大学》2014年硕士论文

【摘要】：管棚超前预支护技术能够有效的限制地面沉陷、坍塌,保持地层处于稳定状态,特别在下穿既有公路、铁路及其他结构物的隧道与地下工程施工中,管棚支护技术以其超前加固距离长、可靠性高、工期短等优点被广泛应用。本文以熊洞湾隧道下穿高速公路段工程实例作为依据,运用弹性地基梁理论,建立管棚的双参数弹性地基梁模型分析了管棚的受力和变形。采用三维有限差分软件FLAC3D模拟了管棚与隧道开挖的相互作用,分析在管棚预支护情况下,随着隧道的开挖,地层变形沉降情况。在理论分析、数值模拟的基础上,提出了一些设计和施工建议。主要研究如下： 1.介绍国内外管棚支护技术的发展与应用,对管棚超前支护研究理论进行总结归纳； 2.结合熊洞湾隧道管棚设计与施工,研究管棚预支护效应机理,分析管棚常用计算力学模型； 3.采用FLAC3D数值分析软件对熊洞湾隧道下穿绵广高速公路段在管棚支护下的开挖进行数值模拟,分析在管棚预支护工况下,随着隧道的开挖,管棚及地层沉降变形情况,同时模拟不设置管棚工况下,随着隧道的开挖,管棚及地层沉降变形情况。研究在管棚支护作用下,隧道开挖的可行性以及实用性。 4.通过理论计算、数值模拟等方法对管棚预支护下隧道开挖过程中地层变形进行综合分析,并将分析结果运用于实践。
[Abstract]:The pipe shed advance pre support technology can effectively limit the ground subsidence, collapse, and keep the stratum in a stable state, especially in the tunnel and underground engineering construction of the tunnel and other structures, which have both the highway, railway and other structures. The pipe shed support technology is widely used for its advantages of long reinforcement distance, high reliability and short period of work. The two parameter elastic foundation beam model of the pipe shed is established by using the elastic foundation beam theory to analyze the stress and deformation of the pipe shed. The interaction between the pipe shed and the tunnel excavation is simulated by the three-dimensional finite difference software FLAC3D, and the excavation of the tunnel is analyzed with the excavation of the tunnel. Based on theoretical analysis and numerical simulation, some suggestions for design and construction are put forward.
1. introduces the development and application of pipe shed support technology at home and abroad, summarizes the theory of pipe shed advance support research.
2. combined with the design and construction of Xiong Dong tunnel pipe shed, the mechanism of pipe shed pre support effect is studied, and the commonly used computational mechanics models of pipe shed are analyzed.
3. FLAC3D numerical analysis software is used to simulate the excavation of the Xiong Dong Wan Tunnel under the Shawn section under the pipe shed support, and the settlement deformation of the pipe shed and the stratum with the tunnel excavation, the pipe shed and the stratum settlement under the condition of the pipe shed Presupport are analyzed. With the excavation of the tunnel, the pipe shed and the formation settlement deformation under the condition of the tunnel excavation. The feasibility and practicability of tunnel excavation under the support of pipe shed are studied.
4. through theoretical calculation, numerical simulation and other methods, comprehensive analysis of stratum deformation during tunnel excavation is carried out, and the analysis results are applied to practice.

【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.4

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