【摘要】：廣州地鐵廣州北站下穿武廣高鐵隧道是目前國內少有的下穿高鐵的地鐵隧道,其周邊各種結構空間分布復雜,下穿隧道在開挖過程中會對上部高鐵隧道產生影響,上部高速鐵路由于運行速度極快,所以對通行安全要求極高;且上部高速列車高速運行時產生的動荷載對下穿隧道的管片會產生影響,所以需在這兩者的相互影響下來決定管片的加固措施,將兩者的影響降到最低,這種情況目前國內少有。主要研究成果如下:1.對上部高鐵動荷載作用下盾構隧道管片受力進行數(shù)值模擬分析,利用混凝土受拉疲勞壽命作為盾構隧道管片疲勞壽命的評價依據(jù)。2.對高壓旋噴加固,管棚加固,樁基置換三種加固措施的隧道受力進行數(shù)值模擬計算,得出埋深10m-20m樁基置換管片疲勞壽命最高,管棚加固管片疲勞壽命次之,高壓旋噴加固管片疲勞壽命最低。3.對不同圍巖級別的盾構隧道受力進行數(shù)值模擬分析,得出盾構隧道管片疲勞壽命隨圍巖級別提高而延長的結論。4.對不同埋深的盾構隧道受力進行數(shù)值模擬,得到實際工程無需加固處理,隧道能正常安全使用的臨界埋深為15m。5.根據(jù)工程實際情況,計算得出盾構隧道采用MJS法加固措施之后管片的疲勞壽命為972年。
[Abstract]:Guangzhou Metro Guangzhou North Station is a rare subway tunnel with high-speed rail in China at present. The spatial distribution of various structures around it is complex, and the tunnel will have an impact on the upper high-speed rail tunnel in the process of excavation. Because the running speed of the upper high-speed railway is very fast, the safety requirements of the upper high-speed railway are very high. And the dynamic load produced by the high speed train running at high speed will have an impact on the segments passing through the tunnel, so it is necessary to determine the reinforcement measures of the segments under the interaction of the two, and to minimize the influence of the two. This situation is rare in China at present. The main research results are as follows: 1. The stress of shield tunnel segment under dynamic load of upper high speed rail is simulated and analyzed, and the tensile fatigue life of concrete is used as the basis for evaluating the fatigue life of shield tunnel segment. 2. The stress of tunnel strengthened by high pressure rotary spray reinforcement, pipe shed reinforcement and pile foundation replacement is simulated and calculated. It is concluded that the fatigue life of buried 10m-20m pile foundation replacement segment is the highest, and the fatigue life of pipe shed strengthened segment is the second. The fatigue life of the segment strengthened by high pressure rotary spray is the lowest. 3. The stress of shield tunnel with different surrounding rock grade is simulated and analyzed, and it is concluded that the fatigue life of shield tunnel segment prolongs with the increase of surrounding rock grade. 4. The stress of shield tunnel with different buried depth is simulated by numerical simulation, and it is found that the critical buried depth of tunnel can be used safely is 15m.5 without reinforcement treatment in practical engineering. According to the actual situation of the project, the fatigue life of the segment of shield tunnel strengthened by MJS method is calculated to be 972.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U455.43

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