【摘要】：改革開放以來,隨著我國國力日益強盛,經(jīng)濟繁榮昌盛,我國的交通事業(yè)已步入高速發(fā)展的時代。作為交通工程的重點之一,隧道的建設(shè)更是得到了快速的發(fā)展。隧道開挖過程中,由于地質(zhì)、水文情況的特殊性和施工工藝的局限性,圍巖超欠挖現(xiàn)象十分常見�，F(xiàn)如今,對圍巖的超挖問題的處理缺乏理論支撐,在實際的工程中,大都根據(jù)工程經(jīng)驗施作回填層,回填層的不規(guī)范施工給隧道工程埋下了很大隱患,影響隧道的安全。因此,對圍巖超挖回填層材料工程參數(shù)的研究就顯得十分迫切。本文將區(qū)間分析引入隧道工程用來研究隧道回填層材料的工程參數(shù),研究內(nèi)容包括以下幾個方面:(1)綜述了隧道超欠挖、隧道回填層材料及回填層工程參數(shù)和隧道圍巖、襯砌、回填層相互關(guān)系研究現(xiàn)狀,分析其存在的問題,并提出了用區(qū)間理論研究回填層的工程參數(shù)。(2)介紹了區(qū)間數(shù)學的基本理論;對不同圍巖級別下隧道超挖進行統(tǒng)計,得出隧道超挖統(tǒng)計值;結(jié)合規(guī)范分析了不同圍巖級別下,隧道襯砌、回填層的幾何參數(shù)和圍巖、襯砌的物理參數(shù),并提出了襯砌結(jié)構(gòu)內(nèi)力檢驗標準。(3)建立圓形隧道圍巖、襯砌、回填層力學模型,運用彈性力學理論、區(qū)間分析,結(jié)合邊界條件和接觸條件推導出隧道回填層變形模量和泊松比的計算模型。結(jié)合具體工程案例,分析回填層變形模量和泊松比與隧道應(yīng)力傳遞的關(guān)系,提出回填層變形模量和泊松比是隧道應(yīng)力傳遞重要的影響因素。(4)結(jié)合前面分析的隧道圍巖、襯砌、回填的各參數(shù),利用有限元軟件Ansys模擬各級圍巖下標準二車道公路隧道的受力和變形,分析隧道回填層工程參數(shù)和隧道襯砌內(nèi)力和位移的相互關(guān)系,引入襯砌安全軸向力作為襯砌破壞標準,運用區(qū)間分析和回歸分析理論求出Ⅳ、Ⅴ圍巖下,標準二車道公路隧道回填層變形模量、泊松比的區(qū)間值,所得到的計算結(jié)果為今后隧道工程中回填層的設(shè)計和施工提供了指導作用。(5)將有限元標準兩車道公路隧道用大小半徑之和修正的等代圓半徑法簡化為圓形隧道,結(jié)合回填層工程參數(shù)計算模型,計算出Ⅳ、Ⅴ級圍巖級別下,隧道回填層變形模量區(qū)間值。將回填層工程參數(shù)理論計算結(jié)果和有限元法結(jié)果對比,發(fā)現(xiàn)理論計算結(jié)果和有限元數(shù)值法計算結(jié)果整體很吻合,從而驗證了理論計算模型的正確性,為今后隧道工程回填材料工程參數(shù)的選取提供了理論依據(jù)。
[Abstract]:Since the reform and opening up, with the increasing strength of our country and the prosperity of economy, the transportation industry of our country has entered the era of rapid development. As one of the key points of traffic engineering, tunnel construction has been developed rapidly. In the process of tunnel excavation, due to the particularity of geological and hydrological conditions and the limitations of construction technology, the phenomenon of overexcavation of surrounding rock is very common. Nowadays, the treatment of overexcavation of surrounding rock is lack of theoretical support. In practical projects, most of them are used as backfill layer according to engineering experience. The irregular construction of backfill layer places great hidden dangers on tunnel engineering and affects the safety of tunnel. Therefore, it is very urgent to study the engineering parameters of overexcavated backfill layer in surrounding rock. In this paper, interval analysis is introduced into tunnel engineering to study the engineering parameters of tunnel backfill material. The research contents include the following aspects: (1) the research status of the relationship between tunnel underexcavation, tunnel backfill material and backfill layer engineering parameters and tunnel surrounding rock, lining and backfill layer is summarized, and the existing problems are analyzed. The engineering parameters of backfill layer are studied by interval theory. (2) the basic theory of interval mathematics is introduced. The statistics of tunnel overexcavation under different surrounding rock grades are carried out, and the statistical values of tunnel overexcavation are obtained. Combined with the code, the geometric parameters of tunnel lining, backfill layer and the physical parameters of surrounding rock and lining are analyzed, and the internal force inspection standard of lining structure is put forward. (3) the mechanical model of surrounding rock, lining and backfill layer of circular tunnel is established, and the calculation model of deformation modulus and Poisson's ratio of tunnel backfill layer is deduced by using elastic mechanics theory, interval analysis, combined with boundary conditions and contact conditions. Combined with the concrete engineering case, the relationship between the deformation modulus and Poisson's ratio of the backfill layer and the stress transfer of the tunnel is analyzed, and it is pointed out that the deformation modulus and Poisson's ratio of the backfill layer are the important influencing factors of the stress transfer of the tunnel. (4) combined with the parameters of the surrounding rock, lining and backfilling, the finite element software Ansys is used to simulate the stress and deformation of the standard second-lane highway tunnel under all levels of surrounding rock. The relationship between the engineering parameters of tunnel backfill layer and the internal force and displacement of tunnel lining is analyzed. The safety axial force of lining is introduced as the failure standard of lining. The interval values of deformation modulus and Poisson's ratio of standard two-lane highway tunnel backfill layer under IV and V surrounding rock are calculated by using interval analysis and regression analysis theory. The calculated results provide guidance for the design and construction of backfill layer in tunnel engineering in the future. (5) the equivalent circular radius method modified by the sum of radius of finite element standard two-lane highway tunnel is simplified into circular tunnel. Combined with the calculation model of backfill engineering parameters, the interval value of deformation modulus of tunnel backfill layer under grade IV and V surrounding rock grade is calculated. By comparing the theoretical calculation results with the finite element method results, it is found that the theoretical calculation results are in good agreement with those calculated by the finite element numerical method, which verifies the correctness of the theoretical calculation model and provides a theoretical basis for the selection of backfill material engineering parameters in tunnel engineering in the future.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：U455.4

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