【摘要】：本文基于寧夏民族自治區(qū)周潭市在建的炸山嘴隧道YK25+330～YK25+360段電到圍巖大變形的情況,及連斷(?)開挖過程存在有滲水,為了防止后續(xù)工程出現類似情況,特選取YK25+250～YK25+280段及YK25+330～YK25+360段兩處斷(?),利用ABAQUS建立模型從圍巖穩(wěn)定性及滲流入手進行計算分析,重點探討了炸山嘴隧道開挖過種中圍巖的應力,應變的變化情況及孔(?)水壓力分布規(guī)律,并討論這些規(guī)律對隧道穩(wěn)定性的影響。1)隧道的周邊位移不僅和初始應力場、圍巖本身的強度參數c、φ值及隧道結構尺寸有關聯,同時也與支護結構構(支護阻力)有關系,支護阻力增大時,圍巖罡性位移移公減小,反之,技護阻力減小時,圍巖圍性位移將會增大,甚至失穩(wěn)。2)選取YK25+250斷雨和YK25+330斷面.利用ABAQUS在合理的參數條件下建立二(?)模型計算發(fā)現,在該地質條件下(?)頂沉降隨著初支厚度、混凝土強度、錨桿長度的增大西減小，，但影響到一定的值后,再增大對拱頂的影響可以忽略了。3)選擇斷面YK25+250～YK25+280和YK2+330～YK25+360在ABAQUS上建立三維模型.通過計算得到隧道開挖過程中周邊圍巖的應力應變及周圍孔散水壓力變化情況, YK25+250～YK25+280段最大應力出現在兩邊墻處,隨著應力的增大,兩邊邊墻處水平位移增大,孔隙水壓力降至最小后圍巖應力值增長速率減小。YK25+330～YK25+360段最大應力出現在拱頂處,隨著應力增大.拱頂木平位移增大�？紫端畨毫Φ淖兓仓苯佑绊懼鴳Φ淖兓�。4)現場監(jiān)測開挖段過程中地表位移、拱頂沉降、圍巖周邊收斂變形并對監(jiān)測數據進行統(tǒng)計分析,找到隧道開挖過程中隧道圍巖的變化規(guī)律，并與數值模型計算所整理的數據進行外比.規(guī)定模型計算的正確性和合理性,以該結果為依據指導后續(xù)的工程設計施工。
[Abstract]:This paper is based on the large deformation of surrounding rock in YK25 330~YK25 360 section of Feshanzui Tunnel under construction in Zhoutan City, Ningxia National Autonomous region, and its continuous fault (?) There is water seepage in the excavation process. In order to prevent the similar situation in the subsequent projects, two fault sections (?) of YK25 250~YK25 280 and YK25 330~YK25 360 are selected, and the ABAQUS model is used to calculate and analyze the stability and seepage of surrounding rock. The stress and strain of surrounding rock in excavation of Feshanzui tunnel and the hole (?) The distribution of water pressure, and the influence of these laws on tunnel stability. 1) the surrounding displacement of the tunnel is not only related to the initial stress field, but also to the strength parameters c, 蠁 of the surrounding rock and the size of the tunnel structure. At the same time, it is also related to the structure of support structure (support resistance). When the support resistance increases, the displacement of the surrounding rock decreases, whereas, when the resistance is reduced, the surrounding displacement of surrounding rock will increase or even lose stability. 2) choose YK25 250 rain break and YK25 330 section. Using ABAQUS to establish two (?) The model calculation shows that, under the geological conditions, (?) With the thickness of initial support, the strength of concrete and the length of anchor rod decrease west, but the influence of increase on arch roof can be neglected after affecting a certain value. 3. 3) selecting section YK25 250~YK25 280 and YK2 330~YK25 360 to build 3D model on ABAQUS. The stress and strain of surrounding rock and the pressure variation of surrounding hole in tunnel excavation are obtained by calculation. The maximum stress of YK25 250~YK25 280 appears at both sides of wall, and with the increase of stress, the horizontal displacement of side wall increases with the increase of stress. When the pore water pressure decreases to the minimum, the growth rate of surrounding rock stress value decreases. YK25 330~YK25 360 maximum stress appears at the arch top and increases with the increase of the stress. The horizontal displacement of the arch is increased. The change of pore water pressure also directly affects the change of stress (.4) monitoring the surface displacement, the settlement of arch roof, the convergent deformation of surrounding rock and the statistical analysis of monitoring data during the excavation process. The variation law of surrounding rock during tunnel excavation is found and compared with the data collected by numerical model calculation. The correctness and rationality of the model calculation are stipulated, and the following engineering design and construction are guided by the result.
【學位授予單位】：西安理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U455.4

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