本文選題：黃土隧道 + 監(jiān)測數(shù)據(jù)��； 參考：《蘭州交通大學(xué)》2017年碩士論文

【摘要】：近年因為來國家各類方針政策的施行,西部各省份交通運輸行業(yè)得到迅速發(fā)展,越來越多的公路、鐵路將穿越黃土區(qū)域。我國黃土隧道設(shè)計和施工并沒有系統(tǒng)的理論體系,大多數(shù)都是以工程類比法為主。本文以塘家塬黃土隧道為依托,主要采用現(xiàn)場監(jiān)測量控、圍巖壓力理論計算及數(shù)值模擬計算三種方法相結(jié)合的手段,研究黃土隧道圍巖變化規(guī)律和應(yīng)力分布規(guī)律,為以后的黃土隧道工程進行指導(dǎo)和借鑒。主要研究內(nèi)容如下:⑴.介紹了黃土隧道的四種施工工法,分別為:中隔壁開挖法(CD法)、雙側(cè)壁導(dǎo)坑法、交叉中隔壁法(CRD法)及三臺階法。對比分析四種工法,評價其優(yōu)劣性。⑵.根據(jù)現(xiàn)場實測數(shù)據(jù)得出:黃土隧道圍巖變形一般經(jīng)歷三個階段“急劇變化—緩慢變化—基本穩(wěn)定”。仰拱封閉以前變形量約占總變形量90%以上,所以基本穩(wěn)定階段一般發(fā)生在仰拱施作完成后。根據(jù)《公路隧道施工技術(shù)規(guī)范》規(guī)定得出:二次襯砌施作的最佳時間為隧道開挖后的第18天。⑶.采用現(xiàn)有的六種圍巖壓力計算方法和七種隧道深淺埋判斷法計算得出,泰沙基理論計算結(jié)果和實測結(jié)果能很好的吻合,推薦使用泰沙基理論為塘家塬大斷面黃土隧道的圍巖計算理論,建議采用47m為塘家塬黃土隧道的深淺埋分界標準。⑷.通過數(shù)值模擬研究在同樣的支護設(shè)計參數(shù)下,中隔壁開挖法(CD法),雙側(cè)壁導(dǎo)坑法及三臺階法的圍巖變形規(guī)律、應(yīng)力分布規(guī)律及塑性區(qū)分布規(guī)律,得出結(jié)論如下:雙側(cè)壁導(dǎo)坑法對于大斷面黃土隧道的開挖穩(wěn)定性以及安全性有較好的保障,能夠更有效地控制圍巖變形,建議在圍巖較差段采用雙側(cè)壁導(dǎo)坑法。
[Abstract]:In recent years, due to the implementation of various national policies, the transportation industry in the western provinces has developed rapidly, and more and more roads and railways will pass through the loess region. There is no systematic theoretical system in the design and construction of loess tunnel in China, most of which are based on engineering analogy. Based on the Tangjiayuan Loess Tunnel, this paper studies the variation law and stress distribution law of the surrounding rock of the loess tunnel by means of the combination of three methods: field monitoring and control, theoretical calculation of surrounding rock pressure and numerical simulation calculation. For the future loess tunnel engineering guidance and reference. The main research contents are as follows: 1. This paper introduces four construction methods of loess tunnel, which are: middle next door excavation method, double side wall guide pit method, cross middle next door method and CRD method, and three stage method. Compare and analyze the four methods and evaluate their merits and demerits. 2. According to the field measured data, it is concluded that the deformation of surrounding rock in loess tunnel generally goes through three stages: rapid change, slow change and basic stability. The deformation amount of the inverted arch is about 90% of the total deformation before closure, so the basic stable stage usually occurs after the completion of the inverted arch construction. According to "Technical Specification for Highway Tunnel Construction", it is concluded that the best time for secondary lining construction is the 18th day after tunnel excavation. By using the existing six kinds of surrounding rock pressure calculation methods and seven tunnel depth and shallow burying judgment methods, it is concluded that the calculated results of Teshaji theory are in good agreement with the measured results. It is recommended to use the theory of Taishaji as the calculation theory of surrounding rock of large section loess tunnel in Tangjiayuan, and to adopt 47m as the standard of deep and shallow buried boundary of Tangjiayuan loess tunnel. Under the same supporting design parameters, the deformation law, stress distribution law and plastic zone distribution law of surrounding rock in the middle adjacent excavation method, double side wall guide pit method and three step method are studied by numerical simulation. The conclusion is as follows: the method of double-side wall guide pit has a good guarantee for the stability and safety of large section loess tunnel excavation and can control the deformation of surrounding rock more effectively. It is suggested that the double-side wall tunnel method should be used in the poor section of surrounding rock.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U456.3

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