本文選題：花山隧道 + 項連山隧道��； 參考：《長安大學》2014年碩士論文

【摘要】：公路隧道洞口一般位于強風化帶上，圍巖比較破碎，特別是下穿既有道路、陡坡等特殊地段的隧道洞口，淺埋、偏壓并且覆蓋層較薄，圍巖成拱能力差。怎樣合理選擇進洞方式，在確保安全的前提下，降低工程造價，縮短工期，同時加強對圍巖破壞機理的研究是特殊地段公路隧道進洞施工急需解決的。 本文總結了山嶺隧道洞口段主要的支護方法、機理以及開挖方法，分析了各種施工方法的優(yōu)劣性及適用條件。針對項連山隧道屬于淺埋、下穿二級公路的特點，采用Midas/GTS有限元分析軟件，按照實際地形建立模型，采用護拱法、管棚預加固和環(huán)形開挖留核心土法、CD工法、CRD工法、雙側壁導坑法等四種施工工法開挖，進行三維數(shù)值模擬。從施工過程中二級公路的豎向變形、塑性區(qū)分布狀態(tài)和規(guī)律、洞口圍巖的變形、應力特征、初期支護變化規(guī)律等方面，研究項連山隧道進洞方案對二級公路及洞口圍巖的影響機制，并結合經(jīng)濟技術比選，得出護拱法、雙側壁導坑法開挖配合管棚是項連山隧道施工的合理進洞方式。 針對花山隧道屬于洞口淺埋，圍巖自穩(wěn)能力差、陡坡進洞的特點，采用Midas/GTS有限元分析軟件，按照實際地形建立模型，分別采用管棚預加固，環(huán)形開挖留核心土法、CD工法、CRD工法、雙側壁導坑法等四種施工工法開挖，進行三維數(shù)值模擬。從施工過程中陡坡段洞口圍巖的變形、塑性區(qū)分布狀態(tài)和發(fā)展規(guī)律、圍巖應力特征、初期支護應力變化規(guī)律等方面，研究花山隧道進洞方案對陡坡洞口圍巖的影響機制，并結合經(jīng)濟技術比選，得出管棚預加固配合雙側壁導坑法開挖是花山隧道進洞施工的合理進洞方式。 本文所得結論對項連山隧道下穿二級公路端洞口、花山隧道陡坡端洞口進洞施工提供了一定的指導和技術支持，同時對類似特殊地段隧道進洞施工具體廣泛的適用性。
[Abstract]:The entrance of highway tunnel is generally located in the strong weathering zone, the surrounding rock is relatively broken, especially through the tunnel entrance of the existing road, steep slope and other special sections of the tunnel, shallow buried, partial pressure and thin overburden, the arched ability of surrounding rock is poor. How to choose the way of entering the tunnel reasonably, under the premise of ensuring the safety, reducing the project cost and shortening the time limit, and strengthening the study on the failure mechanism of surrounding rock are urgently needed to be solved in the construction of the tunnel entry in the special section. In this paper, the main supporting methods, mechanism and excavation methods of the entrance section of the Shanling tunnel are summarized, and the advantages and disadvantages of various construction methods and their applicable conditions are analyzed. In view of the characteristics of Xianglianshan Tunnel which belongs to shallow buried and underpass second class highway, Midas / GTS finite element analysis software is used to establish the model according to the actual terrain, and the method of protecting arch, pre-reinforcement of pipe shed and circular excavation and retaining core earth method are used to construct CRD method. Three-dimensional numerical simulation was carried out by excavation of four kinds of construction methods such as double side wall guide pit method. In the process of construction, the vertical deformation of the secondary highway, the distribution and law of plastic zone, the deformation of surrounding rock at the entrance of the tunnel, the characteristics of stress, the law of change of initial support, etc. This paper studies the influence mechanism of Xianglianshan tunnel entry scheme on the second class highway and surrounding rock of the tunnel mouth, and combining with economic and technical comparison, it is concluded that the reasonable tunnel entry mode is the arch protection method and the double side wall guide pit method to excavate the combined pipe shed in the Xianglianshan tunnel construction. In view of the characteristics of Huashan Tunnel which is shallow buried at the entrance of the tunnel, with poor self-stability of surrounding rock and steep slope into the tunnel, the Midas / GTS finite element analysis software is used to establish the model according to the actual terrain, respectively, the pipe sheds are pre-strengthened and the circular excavation is made with the core earth method CD method and the CRD method. Three-dimensional numerical simulation was carried out by excavation of four kinds of construction methods such as double side wall guide pit method. From the aspects of deformation, distribution and development law of plastic zone, stress characteristics of surrounding rock and the change law of initial support stress during construction, the influence mechanism of entry scheme of Huashan tunnel on surrounding rock of steep slope entrance is studied. Combined with economic and technical comparison, it is concluded that the excavation of pipe shed pre-reinforcement and double-sidewall guide pit method is a reasonable way of tunnel entry construction in Huashan Tunnel. The conclusions of this paper provide some guidance and technical support for the construction of the entrance of Xianglianshan Tunnel through the end of the second class highway and the end of the steep slope of the Huashan Tunnel. At the same time, it is widely applicable to the tunnel entry construction in similar special areas.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U455.4

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本文編號：2048655