發(fā)布時間：2019-03-12 19:35

【摘要】：隧道的開挖過程中,隧道周圍的巖體應(yīng)力狀態(tài)隨即發(fā)生改變。壓力拱效應(yīng)的形成對隧道的自穩(wěn)能力以及隧道的深、淺埋劃分有著決定性作用,這也是對于軟弱或具有流變性質(zhì)的圍巖,隧道支護結(jié)構(gòu)設(shè)計中圍巖應(yīng)力釋放率的選擇的一個重要的參考。本文采用數(shù)值方法,研究了隧道結(jié)構(gòu)設(shè)計參數(shù)、工程地質(zhì)條件、壓力拱效應(yīng)以及圍巖應(yīng)力釋放率之間的內(nèi)在關(guān)系,具體內(nèi)容如下:(1)以京新高速金盆灣隧道為工程依托,描述了隧道施工過程中的壓力拱效應(yīng),采用應(yīng)力路徑分析方法,給出了隧道壓力拱的定義和內(nèi)、外邊界的確定方法。(2)通過MIDAS/GTS數(shù)值模擬,定量地研究了隧道埋深、隧道跨度、圍巖力學(xué)參數(shù)、隧道圍巖分層、施工過程等因素對壓力拱的影響規(guī)律。從數(shù)值結(jié)果可以看出,若要形成壓力拱效應(yīng),隧道存在臨界成拱埋深,在既定地質(zhì)條件下,隧道跨度是影響臨界成拱埋深的最大因素。(3)以隧道能否性形成有效的壓力拱為依據(jù),給出了金盆灣隧道壓力拱臨界成拱埋深,進行了深、淺埋的判定與劃分,通過與測量數(shù)據(jù)對比,為隧道的動態(tài)設(shè)計和施工提供了一定的參考。(4)采用MIDAS/GTS軟件建立了金盆灣隧道的三維計算模型,分析了圍巖應(yīng)力釋放率對壓力拱效應(yīng)、隧道變形及支護結(jié)構(gòu)受力的影響。結(jié)果表明:對于金盆灣軟弱圍巖隧道,初次應(yīng)力釋放率是影響開挖過程中圍巖穩(wěn)定性的重要因素。
[Abstract]:During the excavation of the tunnel, the stress state of the surrounding rock mass changes. The formation of pressure arch effect plays a decisive role in the self-stabilization ability of tunnel and the division of tunnel depth and shallow burial, which is also the case of weak or rheological surrounding rock. It is an important reference for the selection of stress release rate of surrounding rock in the design of tunnel supporting structure. In this paper, the internal relations among structural design parameters, engineering geological conditions, pressure arch effect and stress release rate of surrounding rock are studied by numerical method. The concrete contents are as follows: (1) based on Jinpenwan tunnel of Jingxin high-speed highway, the internal relationship between the parameters of tunnel structure design and the stress release rate of surrounding rock is studied. The effect of pressure arch in tunnel construction is described, and the definition of tunnel pressure arch and the determination of inner and outer boundary are given by means of stress path analysis. (2) the buried depth of tunnel is quantitatively studied by means of MIDAS/GTS numerical simulation. The influence of tunnel span, surrounding rock mechanical parameters, surrounding rock stratification, construction process and other factors on pressure arch. It can be seen from the numerical results that if the pressure arch effect is to be formed, the tunnel has a critical arch buried depth, and under the given geological conditions, The span of tunnel is the biggest factor affecting the critical arch depth. (3) based on the effective pressure arch formed by the tunnel, the critical arch depth of Jinpenwan tunnel pressure arch is given, and the judgment and division of deep and shallow burial are carried out. By comparing with the measured data, some references are provided for the dynamic design and construction of the tunnel. (4) the three-dimensional calculation model of Jinpenwan Tunnel is established by using MIDAS/GTS software, and the effect of surrounding rock stress release rate on pressure arch is analyzed. The influence of tunnel deformation and support structure. The results show that the initial stress release rate is an important factor affecting the stability of surrounding rock during excavation for Jinpenwan soft surrounding rock tunnel.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U451.2

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