發(fā)布時(shí)間：2018-01-16 01:02

  本文關(guān)鍵詞：穿越滑坡段隧道襯砌受力分析及變形控制技術(shù)研究　出處：《西安科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 滑坡隧道 變形機(jī)理 襯砌內(nèi)力 控制技術(shù) 現(xiàn)場(chǎng)監(jiān)測(cè)

【摘要】：鑒于我國(guó)山區(qū)地形和地質(zhì)條件的特殊性和復(fù)雜性,在這些地區(qū)修建公路或鐵路時(shí),不得不以隧道的形式穿過其中極有可能存在著滑坡等不良地質(zhì)問題的地段,同時(shí),已投入運(yùn)營(yíng)的穿山隧道也可能因邊坡巖土體蠕滑等原因而演變成滑坡隧道。針對(duì)目前滑坡段隧道方面的研究現(xiàn)狀,本文綜合采用理論分析、數(shù)值模擬和現(xiàn)場(chǎng)實(shí)測(cè)等研究方法,在滑坡段隧道類型及變形破壞特征分析的基礎(chǔ)上,對(duì)滑坡滑向與軸線正交條件下隧道襯砌受力及變形控制技術(shù)進(jìn)行系統(tǒng)研究,取得了具有一定價(jià)值的研究成果,對(duì)類似工程的設(shè)計(jì)與施工具有一定的指導(dǎo)和借鑒意義,主要研究成果如下:⑴根據(jù)隧道與滑坡的相對(duì)位置關(guān)系,總結(jié)出4類穿越滑坡段隧道地質(zhì)力學(xué)模型,并分析了各力學(xué)模型中隧道在滑坡推力與圍巖壓力作用下的受力變形特征,給出了對(duì)應(yīng)情況下隧道的受力簡(jiǎn)圖及變形特點(diǎn),并對(duì)各類模型中襯砌裂縫成因進(jìn)行了分析;最后分析了地形偏壓荷載作用下隧道圍巖壓力的確定方法以及變形特征,為進(jìn)一步研究滑坡地段隧道的受力變形機(jī)理和該類工程問題的防治提供一定的參考。⑵根據(jù)穿越滑坡段直墻拱形隧道襯砌與滑動(dòng)面的位置關(guān)系,結(jié)合已有的滑坡相關(guān)理論,確定滑坡滑向與軸線正交條件下隧道襯砌上滑坡推力的分布形式和作用范圍�；诮Y(jié)構(gòu)力學(xué)方法,取半圓拱形隧道襯砌全拱結(jié)構(gòu)作為研究對(duì)象,建立洞口段隧道襯砌結(jié)構(gòu)力學(xué)模型,分析在滑坡體變形影響下隧道襯砌的受力狀態(tài),推導(dǎo)出了穿越滑坡段半圓拱形隧道襯砌內(nèi)力的理論計(jì)算公式。⑶基于滑坡段隧道的受力變形機(jī)理和推導(dǎo)出的滑坡滑向與軸線正交條件下隧道襯砌內(nèi)力理論計(jì)算公式,結(jié)合工程實(shí)例,對(duì)不同受力狀態(tài)下的隧道襯砌內(nèi)力分布進(jìn)行了分析,并采用ANSYS有限元軟件驗(yàn)證了該計(jì)算公式的正確性。在此基礎(chǔ)上,對(duì)坡體與襯砌兩類參數(shù)影響下的襯砌內(nèi)力分布情況進(jìn)行了分析,得出各參數(shù)影響下襯砌內(nèi)力分布規(guī)律,為該類隧道襯砌的優(yōu)化設(shè)計(jì)及采取針對(duì)性的綜合整治措施提供一定的理論依據(jù)。⑷在對(duì)隧道和滑坡變形預(yù)加固技術(shù)及作用機(jī)理分析的基礎(chǔ)上,結(jié)合唐家塬隧道進(jìn)口段實(shí)際情況,采取綜合整治措施,并通過現(xiàn)場(chǎng)監(jiān)測(cè),對(duì)該綜合整治方案的效果進(jìn)行了評(píng)價(jià)。監(jiān)測(cè)結(jié)果表明,該方案能夠確保隧道的后續(xù)施工安全高效進(jìn)行,同時(shí)可有效降低隧道施工擾動(dòng)對(duì)邊坡穩(wěn)定性產(chǎn)生的不利影響,而抗滑樁與隧道襯砌形成組合加固結(jié)構(gòu),能有效控制坡體的滑動(dòng),提高該類邊坡的穩(wěn)定性。
[Abstract]:In view of the particularity and complexity of terrain and geological conditions in mountainous areas of our country, when building roads or railways in these areas, we have to pass through the areas where there are some bad geological problems such as landslides and so on in the form of tunnels. At the same time, the tunnel that has been put into operation may also evolve into a landslide tunnel due to the creep of slope and soil. In view of the current research situation of the tunnel in the landslide section, this paper comprehensively adopts theoretical analysis. Based on the analysis of the tunnel types and deformation and failure characteristics of landslide section, the stress and deformation control technology of tunnel lining under the condition of sliding direction and axis are studied systematically by numerical simulation and field measurement. Some valuable research results have been obtained, which have certain guidance and reference significance for the design and construction of similar projects. The main research results are as follows: 1 according to the relative position relationship between tunnel and landslide. Four kinds of geological mechanics models of tunnel passing through landslide section are summarized, and the deformation characteristics of tunnel under the action of landslide thrust and surrounding rock pressure in each mechanical model are analyzed. The stress diagram and deformation characteristics of tunnel under corresponding conditions are given, and the causes of lining cracks in various models are analyzed. Finally, the determination method and deformation characteristics of surrounding rock pressure of tunnel under the action of topographic eccentric load are analyzed. In order to further study the deformation mechanism of the tunnel in landslide section and the prevention and cure of this kind of engineering problems, it provides a certain reference .2 according to the position relationship between the tunnel lining and sliding surface of the straight wall tunnel through the landslide section. Combined with the existing landslide theory, the distribution form and action range of landslide thrust on tunnel lining under the condition of landslide sliding direction and axis orthogonal are determined, based on structural mechanics method. Taking the semi-circular arch tunnel lining full arch structure as the research object, the mechanical model of tunnel lining structure is established, and the stress state of tunnel lining under the influence of landslide deformation is analyzed. The theoretical calculation formula of lining internal force of semi-circular arch tunnel through landslide section is derived. .3 based on the mechanism of stress and deformation of landslide section tunnel and the theoretical calculation of tunnel lining internal force under the condition of landslide sliding direction and axis orthogonality, the theory of tunnel lining internal force is deduced. Style. Combined with engineering examples, the internal force distribution of tunnel lining under different loading conditions is analyzed, and the correctness of the calculation formula is verified by using ANSYS finite element software. The distribution of lining internal force under the influence of slope and lining parameters is analyzed, and the law of lining internal force distribution under the influence of each parameter is obtained. For the optimal design of the tunnel lining and take targeted comprehensive regulation measures to provide a certain theoretical basis .4 on the basis of tunnel and landslide deformation pre-reinforcement technology and action mechanism analysis. Combined with the actual situation of the entrance section of Tangjiayuan tunnel, the comprehensive regulation measures are taken, and the effect of the comprehensive regulation scheme is evaluated through on-site monitoring. The monitoring results show that. This scheme can ensure the safe and efficient construction of the tunnel, at the same time can effectively reduce the adverse impact of tunnel construction disturbance on slope stability, and anti-slide pile and tunnel lining form a combined reinforcement structure. It can effectively control the sliding of slope body and improve the stability of this kind of slope.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U455.91

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本文編號(hào)：1430831