关角隧道施工机械配套与通风技术研究

发布时间：2018-04-30 11:37

本文选题：长大隧道 + 高原环境　；参考：《兰州交通大学》2015年硕士论文

【摘要】：随着我国国民经济快速发展,对交通路网的要求越来越高,废弃原有曲线半径小的路线,采用长大隧道取直是必然的发展方向。长大隧道的建设往往是整个工程的重点,是影响整个工程工期的关键因素。现代隧道施工对施工机械的依赖程度越来越高,合理的施工机械化配套方案是缩短工程工期的关键环节。隧道通风一直是困扰隧道长距离施工的难题,隧道施工通风技术水平直接影响隧道独头掘进的规模,对新线的勘测、选线、工程设计、施工组织都有重要影响。关角隧道施工机械配套与通风方案,对工程工期、安全性、经济性都有很大的影响。本论文针对青藏铁路西格二线XGZHQ5-1标段的新关角隧道工程,研究长大隧道的施工机械配套与通风技术问题,研究工作和研究成果主要包括:(1)通过查阅大量文献资料,得到高原特殊环境下施工机械选型配套基本原则,重点分析隧道开挖作业线、出碴运输作业线和初期支护作业线。(2)本文运用模糊综合评价法,对装载机进行方案比选,得到最优解。(3)本文运用数学模型排队论法,计算出装载机和出碴车最优的配套方案,可以计算出在不同进尺情况下最经济的配套方案。(4)论文通过对关角隧道的岩性分析,将大型喷射机组和小型湿喷机在施工效率、作业环境、安全性等方面通过参数和性能进行比较,得到大型喷射机组在硬岩开挖工况下各方面都优于小型湿喷机,而小型湿喷机适用于软弱围岩。(5)本文从关角隧道施工通风的难点入手,根据空气性质与海拔的关系,对施工需风量计算进行了修正,计算得到施工通风的总需风量。针对辅助坑道距离长的特点,对原通风方案进行优化,最终采用中隔板通风方案。优化后的通风方案使能耗降低24%,上部风道进风量是原方案的4倍,满足施工的要求。(6)针对风管出风口的风速不同,运用流体力学方法分析通风设计的参数,分析出风口到掌子面最合理距离。结果表明,风管出口风速11m/s,距掌子面25m左右;风管出口风速10m/s,距掌子面20m左右,效果最佳。论文系统全面分析了关角隧道的施工机械配套选型和通风技术问题,方案合理可靠,为高原隧道施工提供一定的借鉴和参考价值。
[Abstract]:With the rapid development of the national economy in our country, the demand for traffic network is becoming higher and higher. It is inevitable to abandon the route with small radius of the original curve and adopt the long tunnel to straighten out. The construction of long tunnel is often the focus of the whole project and the key factor affecting the construction period of the whole project. Modern tunnel construction depends more and more on construction machinery, and reasonable construction mechanization is the key to shorten the construction period. Tunnel ventilation has always been a difficult problem for long distance construction of tunnels. The technical level of ventilation in tunnel construction directly affects the scale of single end tunneling, and has an important impact on the survey, selection of new lines, engineering design and construction organization. The matching and ventilation scheme of Guanjiao tunnel construction machinery has great influence on the construction period, safety and economy. In this paper, aiming at the new Guanjiao tunnel project of the second XGZHQ5-1 section of the Qinghai-Tibet Railway, the paper studies the construction machinery matching and ventilation technology of the long tunnel. The research work and research results mainly include: 1) through consulting a large number of documents, The basic principles of construction machinery selection and matching under the special environment of plateau are obtained, with emphasis on the analysis of tunnel excavation operation line, ballast transportation line and initial support line. 2) in this paper, a fuzzy comprehensive evaluation method is used to compare and select the loaders' schemes. In this paper, the optimal matching scheme of loader and ballast truck can be calculated by using the mathematical model queuing theory method, and the most economical matching scheme can be calculated under the condition of different ruler.) the lithology analysis of Guanjiao tunnel is carried out in this paper. By comparing the construction efficiency, working environment, safety and so on between the large jet unit and the small wet jet machine, it is found that the large jet unit is superior to the small wet jet machine in every aspect under the condition of hard rock excavation. This paper starts with the difficulty of ventilation in Guanjiao tunnel, according to the relation between air property and altitude, modifies the calculation of construction air demand, and calculates the total air demand of construction ventilation. According to the characteristics of long distance of auxiliary tunnel, the original ventilation scheme was optimized and the middle partition ventilation scheme was adopted. The optimized ventilation scheme reduces the energy consumption by 24%, and the inlet air volume of the upper air duct is 4 times that of the original one, which meets the requirements of the construction.) according to the different wind speed of the air duct outlet, the hydrodynamic method is used to analyze the parameters of the ventilation design. Analyze the most reasonable distance from the air outlet to the palm. The results show that the wind velocity at the outlet of the air duct is 11 m / s, about 25 m from the palm surface, and 10 m / s from the outlet of the duct, and 20 m from the palm surface. This paper systematically and comprehensively analyzes the matching selection of construction machinery and the technical problems of ventilation in Guanjiao Tunnel. The scheme is reasonable and reliable, which provides a certain reference and reference value for the construction of highland tunnel.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.3;U453.5

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