本文關(guān)鍵詞： 軟巖隧道 大變形 小凈距 受力分析　出處：《中國鐵道科學(xué)研究院》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：由于我國中西部地區(qū)地質(zhì)、地形條件復(fù)雜,在今后的鐵路公路建設(shè)中必將會(huì)遇到大量的隧道工程。受地形與特殊地質(zhì)條件限制,軟巖小凈距隧道這種特殊結(jié)構(gòu)形式也必將會(huì)經(jīng)常出現(xiàn)。本文以新建蘭渝鐵路新城子隧道為工程背景,采用有限差分軟件FLAC3D進(jìn)行數(shù)值模擬,并建立多組不同凈距的模型,對(duì)比分析軟巖擠壓大變形隧道在不同小凈距段的變形與受力情況。結(jié)合新城子隧道工程中進(jìn)行的圍巖壓力和鋼拱架應(yīng)力試驗(yàn),得到軟巖地質(zhì)條件下隧道小凈距段的變形和受力特點(diǎn)和規(guī)律。為今后軟巖擠壓大變形小凈距隧道的設(shè)計(jì)施工提供依據(jù)�？偨Y(jié)本文的主要工作為:1、對(duì)比分析硬巖隧道和軟巖隧道的變形和受力情況,找出軟巖擠壓性大變形隧道的主要特征。2、針對(duì)新城子隧道軟巖小凈距段的大變形問題,對(duì)軟巖擠壓大變形隧道在小凈距段的受力及變形情況進(jìn)行分析研究。采用數(shù)值模擬等方法重點(diǎn)分析了軟巖擠壓變形隧道不同凈距圍巖和支護(hù)結(jié)構(gòu)的變形和受力情況。3、針對(duì)新城子隧道小凈距段的圍巖壓力、鋼架受力、等進(jìn)行現(xiàn)場監(jiān)測(cè),分析了小凈距隧道圍巖和支護(hù)結(jié)構(gòu)的受力情況。4、根據(jù)新城子隧道的現(xiàn)場應(yīng)力測(cè)試及變形的動(dòng)態(tài)跟蹤,采用理論分析,研究了軟巖大變形隧道施工控制效果。
[Abstract]:Due to the geological conditions in the central and western regions of China and the complex terrain conditions, there will be a large number of tunnel projects in the future railway highway construction, which will be restricted by the topography and special geological conditions. The special structure of soft rock tunnel with small clear distance will also appear frequently. In this paper, taking the Xinchengzi tunnel of the new Lanzhou-Chongqing railway as the engineering background, the finite difference software FLAC3D is used to carry out the numerical simulation, and a number of models with different net spacing are established. The deformation and stress of soft rock extruded large deformation tunnel in different small spacing sections are compared and analyzed. Combined with the surrounding rock pressure and steel arch stress test carried out in Xinchengzi tunnel project, The deformation and stress characteristics of small spacing section of tunnel under soft rock geological conditions are obtained, which provides the basis for the design and construction of soft rock tunnel with large deformation and small net distance in the future. The main work of this paper is summarized as 1: 1, and the hard rock tunnel is comparatively analyzed. Deformation and stress of tunnels and soft rock tunnels, To find out the main characteristics of soft rock compressible large deformation tunnel. 2. Aiming at the problem of large deformation of soft rock with small net distance in Xinchengzi tunnel, The stress and deformation of soft rock extruded large deformation tunnel in small net distance are analyzed. The deformation and stress of surrounding rock and supporting structure of soft rock extrusion tunnel with different net distance are analyzed by numerical simulation. For the surrounding rock pressure of the small spacing section of Xinchengzi Tunnel, According to the stress test and dynamic tracking of deformation in Xinchengzi tunnel, the stress of surrounding rock and supporting structure of small clear distance tunnel is analyzed by theoretical analysis, according to the field stress test and dynamic tracking of deformation of Xinchengzi tunnel, the stress of steel frame is monitored on the spot, and the stress of supporting structure is analyzed. The construction control effect of large deformation tunnel in soft rock is studied.
【學(xué)位授予單位】：中國鐵道科學(xué)研究院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U455.4

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相關(guān)期刊論文 前1條

1 唐儀興,張玉軍;近距離雙隧道開挖與支護(hù)的穩(wěn)定性有限元計(jì)算[J];巖土力學(xué);1999年01期

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本文編號(hào)：1522024