發(fā)布時(shí)間：2018-01-18 11:19

  本文關(guān)鍵詞：馬嘴隧道出口淺埋段圍巖及邊坡穩(wěn)定性研究　出處：《重慶大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 高速公路隧道 洞口淺埋段 軟弱圍巖施工 邊坡穩(wěn)定 數(shù)值模擬

【摘要】：經(jīng)濟(jì)的迅速發(fā)展、科學(xué)技術(shù)的進(jìn)步,必然要求提供更加安全、舒適、快速、方便經(jīng)濟(jì)的交通運(yùn)輸方式,高速公路的大量修建因此成為必然。隨著西部大開發(fā)戰(zhàn)略的實(shí)施,高速公路建設(shè)已經(jīng)由平原向山嶺地區(qū)推進(jìn),與之相對應(yīng),公路隧道也得到迅猛發(fā)展。隧道工程往往是高速公路修建中的控制工程,隧道施工的周期和質(zhì)量將直接影響到整條高速公路的建成。在山嶺丘壑區(qū),隧道不可避免的要穿越地質(zhì)情況復(fù)雜地區(qū),在山區(qū)隧道進(jìn)出口段,一般會(huì)遇到淺埋段軟弱破碎圍巖,且伴有易滑塌邊仰坡,其力學(xué)性質(zhì)的復(fù)雜性常會(huì)嚴(yán)重影響隧道工程的正常施工。本文主要研究重慶南道高速公路馬嘴隧道出口淺埋段,該段內(nèi)圍巖主要是粉質(zhì)粘土與風(fēng)化頁巖,巖體軟弱破碎,給隧道的修建帶來了難度。本文據(jù)此開展了隧道洞口地段邊坡及隧道變形機(jī)理研究工作。取得的成果有助于建立隧道洞口段邊坡變形和穩(wěn)定性理論,同時(shí)可為制定有效的工程措施提供理論指導(dǎo)。全文主要研究內(nèi)容和結(jié)論有:①基于隧區(qū)工程地質(zhì)條件,采用基于極限平衡理論的傳遞系數(shù)法來計(jì)算滑坡穩(wěn)定性系數(shù),計(jì)算出暴雨條件下邊坡穩(wěn)定系數(shù)小于指定安全值,需對邊坡進(jìn)行支擋措施,保障隧道進(jìn)洞施工安全。②考慮徑向收縮、橢圓化變形和豎向位移影響下的隧道周邊位移邊界條件后引入應(yīng)力函數(shù),推導(dǎo)及探討了隧道周邊的位移及應(yīng)力公式。③在分析隧道邊坡變形及下滑力基礎(chǔ)上,計(jì)算了抗滑樁的錨固段,受荷段的剪力、彎矩及側(cè)應(yīng)力,通過側(cè)應(yīng)力驗(yàn)證其設(shè)計(jì)合理性。此外,分析了超前大管棚支護(hù),超前小導(dǎo)管注漿等輔助施工措施支護(hù)機(jī)理及設(shè)計(jì)參數(shù)。④借助對出口段的數(shù)值分析,模擬實(shí)現(xiàn)隧道CD法開挖,得出分步開挖后,及時(shí)進(jìn)行初期支護(hù)將有效控制隧道周邊變形。分析模擬了隧道開挖后邊坡的位移及應(yīng)力分布,發(fā)現(xiàn)邊坡前緣容易發(fā)生剪應(yīng)力集中,應(yīng)注意坡面防護(hù)。⑤現(xiàn)場監(jiān)控觀測了邊坡地表的沉降,隧道出口段洞內(nèi)拱頂沉降與周邊收斂。將觀測數(shù)據(jù)處理后得到拱頂沉降隨分布開挖的變形規(guī)律,及地表沉降與隧道的空間位置的關(guān)系。
[Abstract]:With the rapid development of economy and the progress of science and technology, it is necessary to provide a more safe, comfortable, fast and convenient mode of transportation. With the implementation of the western development strategy, highway construction has been pushed from the plain to the mountain area, corresponding to it. Highway tunnel has also been developed rapidly. Tunnel engineering is often a control project in highway construction. The period and quality of tunnel construction will directly affect the completion of the whole highway. It is inevitable for the tunnel to pass through the complex geological area. In the entrance and exit section of the tunnel in the mountain area, it is usually met with weak and broken surrounding rock in the shallow buried section, and the slope is prone to slide. The complexity of its mechanical properties often seriously affects the normal construction of tunnel engineering. This paper mainly studies the shallow burying section of Mazui Tunnel exit of Chongqing Nandao Expressway, in which the surrounding rock is mainly silty clay and weathered shale. Rock mass is weak and broken. It is difficult to build the tunnel. Based on this, the research work on the slope and deformation mechanism of tunnel entrance section is carried out. The results obtained are helpful to establish the theory of slope deformation and stability at the tunnel entrance section. At the same time, it can provide theoretical guidance for the formulation of effective engineering measures. The main contents and conclusions of this paper are based on the engineering geological conditions of tunnel area. The transfer coefficient method based on the limit equilibrium theory is used to calculate the landslide stability coefficient, and the slope stability coefficient is less than the specified safety value under the rainstorm condition, so it is necessary to carry out the retaining measures for the slope. The stress function is introduced after considering radial contraction elliptical deformation and vertical displacement under the boundary condition of tunnel peripheral displacement to ensure the safety of tunnel entry. 2. Based on the analysis of slope deformation and sliding force, the shear force, bending moment and lateral stress of Anchorage section and loaded section of anti-slide pile are calculated. In addition, the supporting mechanism and design parameters of auxiliary construction measures such as pipe shed support, grouting with small pipe and so on are analyzed with the help of numerical analysis of the exit section. The CD method of tunnel excavation is simulated, and it is concluded that the early support will effectively control the deformation of tunnel periphery after step excavation. The displacement and stress distribution of the slope after tunnel excavation are analyzed and simulated. It is found that shear stress concentration is easy to occur in the front edge of the slope, and the slope surface settlement should be monitored and observed by monitoring and observing the slope surface protection .5 on the spot. The deformation law of the arch settlement along with the distribution of excavation and the relationship between the surface settlement and the space position of the tunnel are obtained by processing the observed data.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U451.2

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