【摘要】：隧道襯砌拱頂空洞作為一種常見的隧道襯砌病害形式會對襯砌結(jié)構(gòu)的受力產(chǎn)生較為明顯的影響。已有的震害調(diào)查記錄表明在地震動過程中,空洞位置處隧道襯砌破損較為嚴(yán)重。鑒于我國有大量已建成隧道位于高烈度地震區(qū),因此對地震動作用下襯砌背后空洞對隧道結(jié)構(gòu)變形及安全穩(wěn)定性的研究就十分必要。論文首先通過數(shù)值模擬方法研究了拱頂空洞尺寸對地震動作用下襯砌結(jié)構(gòu)的動力響應(yīng)影響,然后以汶川大地震中震害較為嚴(yán)重的龍溪隧道為工程背景,對不同地震烈度下拱頂空洞對隧道襯砌結(jié)構(gòu)的地震動力響應(yīng)進(jìn)行了分析。最后針對龍溪隧道工程對拱頂空洞加固圈的參數(shù)進(jìn)行了優(yōu)化分析。本文的主要研究工作及成果如下：(1)對襯砌背后空洞的成因進(jìn)行了歸納總結(jié),將空洞的成因總結(jié)為以下兩個主要方面：施工質(zhì)量原因和設(shè)計(jì)方案考慮不充分。總結(jié)了幾種常用的隧道襯砌背后空洞的處治措施,主要包括：回填注漿、錨桿補(bǔ)強(qiáng)、內(nèi)表面補(bǔ)強(qiáng)、內(nèi)襯+鋼拱架補(bǔ)強(qiáng)、襯砌改建。(2)對拱頂空洞的尺寸對隧道襯砌結(jié)構(gòu)的影響進(jìn)行了研究,得出結(jié)論：隧道襯砌背后拱頂空洞對隧道拱頂襯砌結(jié)構(gòu)的變形、內(nèi)力及應(yīng)力有較為明顯的影響。隨著空洞尺寸的增大,襯砌結(jié)構(gòu)變形顯著,空洞位置處襯砌彎矩增大而軸力減小,正應(yīng)力及剪應(yīng)力均明顯增大。(3)依托工程實(shí)例,在不同地震度烈度條件下,對拱頂存在大范圍空洞的隧道襯砌結(jié)構(gòu)進(jìn)行研究分析,得出結(jié)論：地震烈度對襯砌結(jié)構(gòu)的正應(yīng)力、剪應(yīng)力以及軸力和彎矩具有較明顯的影響,對彎矩的增大作用更為明顯,可能會造成襯砌大偏心受拉破壞。(4)對隧道空洞位置加固圈參數(shù)進(jìn)行優(yōu)化分析,得出結(jié)論：加固圈剛度能夠有效控制襯砌結(jié)構(gòu)的受力并且存在最優(yōu)值。加固圈厚度對于襯砌結(jié)構(gòu)的受力也有相應(yīng)的影響,隨著襯砌厚度的提高,襯砌結(jié)構(gòu)應(yīng)力相應(yīng)減小,彎矩減小而軸力增大,襯砌結(jié)構(gòu)受力更為合理。
[Abstract]:As a common form of tunnel lining diseases, tunnel lining arch cavities have obvious influence on the stress of lining structure. The existing records of earthquake damage investigation show that the tunnel lining damage is serious in the process of ground motion. In view of the fact that a large number of tunnels have been built in our country, it is necessary to study the tunnel structure deformation and safety stability under the action of ground motion. In this paper, the influence of cavity size on the dynamic response of lining structure under ground motion is studied by numerical simulation method, and then the Longxi tunnel, which is seriously damaged by Wenchuan earthquake, is taken as the engineering background. The seismic dynamic response of arch cavities to tunnel lining structures under different earthquake intensity is analyzed. Finally, the parameters of cavity reinforcement ring of arch roof are optimized for Longxi tunnel project. The main research work and results are as follows: (1) the causes of the cavity behind the lining are summarized and summarized into the following two main aspects: the construction quality reasons and the design plan are not fully considered. This paper summarizes several kinds of treatment measures for the cavity behind tunnel lining, including backfilling grouting, reinforcement of anchor rod, reinforcement of inner surface, reinforcement of arch frame of lining steel, etc. (2) the influence of the size of the arch roof cavity on the tunnel lining structure is studied, and the conclusion is drawn that the arch roof cavity behind the tunnel lining has obvious influence on the deformation, internal force and stress of the tunnel arch roof lining structure. With the increase of the cavity size, the lining structure is deformed significantly, the bending moment of the lining at the cavity position increases and the axial force decreases, and the normal stress and shear stress increase obviously. (3) depending on the engineering example, under the conditions of different earthquake intensity, Based on the analysis of tunnel lining structure with large scale cavities in arch roof, it is concluded that seismic intensity has obvious influence on the normal stress, shear stress, axial force and bending moment of lining structure, especially on the increase of bending moment. The large eccentricity of the lining may be damaged by tension. (4) the parameters of the reinforcement ring in the cavity position of the tunnel are optimized and it is concluded that the stiffness of the strengthened ring can effectively control the force of the lining structure and there is an optimum value. With the increase of the thickness of the lining, the stress of the lining structure decreases, the bending moment decreases and the axial force increases, so the stress of the lining structure is more reasonable.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U452.28

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