發(fā)布時間：2018-01-30 09:43

  本文關(guān)鍵詞： 鐵路隧道 數(shù)值分析 穩(wěn)定性 控制技術(shù)　出處：《石家莊鐵道大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國交通建設(shè)的進(jìn)展，近接采空區(qū)的公路隧道、鐵路隧道不斷涌現(xiàn)，如何確保近接采空區(qū)工程的施工安全和運(yùn)營安全逐漸成為工程界所面臨的嶄新課題。當(dāng)新建隧道遇采空區(qū)地段時，面臨的危害主要有：(1)新建開挖施工振動造成既有采空區(qū)巖板或巖柱失穩(wěn)，導(dǎo)致開挖洞體坍塌；(2)采空區(qū)的存在改變了原始地應(yīng)力分布狀態(tài)，導(dǎo)致隧道結(jié)構(gòu)受力不均，易引發(fā)新建隧道局部開裂；(3)采空區(qū)長期殘余變形引發(fā)新建隧道不均勻沉降，嚴(yán)重影響列車運(yùn)行安全和隧道結(jié)構(gòu)耐久性等。因此本文以婁邵鐵路擴(kuò)能改造工程中的明清堂隧道為工程背景，基于穿越既有采空區(qū)隧道施工控制技術(shù)，主要進(jìn)行了以下幾個方面的研究工作： (1)根據(jù)明清堂隧道鉆探資料顯示，新建隧道多遇下伏隱伏采空區(qū)和上伏露天采空區(qū)，為分析采空區(qū)對隧道施工效應(yīng)的影響程度，本文添加了隧道存在上側(cè)和單側(cè)隱伏采空區(qū)，以及隧道存在單側(cè)露天采空區(qū)幾種情況，從洞周位移、地表沉降、支護(hù)內(nèi)力和塑性區(qū)分布四方面通過比較分析結(jié)合實(shí)際施工情況綜合確定適合明清堂隧道的施工方法；確定施工方法后，又分析了不同距離采空區(qū)下采用該法的隧道開挖模擬，確定該法是否繼續(xù)適用。 (2)采用突變理論評價采空區(qū)與隧道間巖層的穩(wěn)定性，通過研究采空區(qū)與隧道間巖層系統(tǒng)的總勢能，建立巖層失穩(wěn)的突變模型，分別推導(dǎo)出了隧道底部含隱伏采空區(qū)、頂部含露天采空區(qū)時巖層突變失穩(wěn)力學(xué)條件和安全距離計算公式，并依據(jù)巖體參數(shù)算出了頂板最小安全厚度值，，與數(shù)值模擬結(jié)果進(jìn)行了對比分析，并給出了不同參數(shù)下采空區(qū)頂板的最小安全厚度值；推導(dǎo)出了考慮動力荷載影響下的采空區(qū)與隧道間巖層突變失穩(wěn)的力學(xué)條件和安全距離計算公式；最后推導(dǎo)出了可能出現(xiàn)的采空區(qū)與隧道間巖層類似于巖柱的突變失穩(wěn)力學(xué)條件和安全距離計算公式，為采空區(qū)地段隧道工程設(shè)計和施工提供了理論依據(jù)。 (3)根據(jù)明清堂隧道的工程特點(diǎn)，總結(jié)了采空區(qū)在安全距離下隧道施工控制技術(shù)、近距離下采空區(qū)隧道施工控制技術(shù)和既有采空區(qū)處治、加固措施三方面內(nèi)容，為工程順利施工提供了一定的保障。
[Abstract]:With the development of traffic construction in our country, the highway tunnel near goaf and railway tunnel emerge constantly. How to ensure the construction safety and operational safety of the near goaf project has gradually become a new topic facing the engineering field. When the new tunnel meets the goaf section. The main hazards are: (1) the vibration of new excavation results in rock slab or pillar instability in the existing goaf, which leads to the cavern collapse; (2) the existence of goaf changes the original distribution of in-situ stress, which leads to the uneven force of tunnel structure and local cracking of newly built tunnel. The long term residual deformation of goaf leads to uneven settlement of newly built tunnels. Seriously affect the safety of train operation and the durability of tunnel structure. Therefore, this paper takes the Ming and Qing Tang Tunnel in the Loushao Railway capacity expansion Project as the engineering background, based on the tunnel construction control technology through the existing goaf. The main research work is as follows: 1) according to the drilling data of the Ming and Qing tang tunnel, the underground goaf and the open-pit goaf are often encountered in the new tunnel, in order to analyze the influence degree of the goaf on the tunnel construction effect. In this paper, the existence of the tunnel in the upper side and unilateral hidden goaf, as well as the tunnel has unilateral open-pit goaf several cases, from the hole around the displacement, surface settlement. Four aspects of the distribution of supporting internal force and plastic zone are compared and combined with the actual construction conditions to determine the construction method suitable for the Ming and Qing Tong Tunnel. After the construction method is determined, the tunnel excavation simulation using this method in different goaf is analyzed, and it is determined whether the method will continue to be applicable. Secondly, the catastrophe theory is used to evaluate the stability of rock strata between the goaf and the tunnel. By studying the total potential energy of the strata system between the goaf and the tunnel, the catastrophe model of rock strata instability is established. The mechanical condition and safety distance calculation formula of sudden instability of rock strata with hidden goaf at the bottom of the tunnel and open-pit goaf at the top are derived, and the minimum safe thickness of roof is calculated according to the rock mass parameters. Compared with the numerical simulation results, the minimum safe thickness of the goaf roof is given under different parameters. The mechanical condition and safe distance calculation formula of sudden instability between goaf and tunnel are derived considering the influence of dynamic load. Finally, the mechanical condition of sudden instability and the formula of safety distance between the strata of goaf and tunnel are deduced, which provides the theoretical basis for the design and construction of tunnel in goaf. According to the engineering characteristics of Ming and Qing tang tunnel, the construction control technology of goaf in safe distance, the construction control technology of goaf tunnel in close distance and the treatment of existing goaf are summarized. Three aspects of reinforcement measures provide a certain guarantee for the smooth construction of the project.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U455.49

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