在高速铁路列车动荷载作用下不同加固措施盾构隧道管片的疲劳寿命预测
发布时间：2019-05-29 18:28
【摘要】：广州地铁广州北站下穿武广高铁隧道是目前国内少有的下穿高铁的地铁隧道,其周边各种结构空间分布复杂,下穿隧道在开挖过程中会对上部高铁隧道产生影响,上部高速铁路由于运行速度极快,所以对通行安全要求极高;且上部高速列车高速运行时产生的动荷载对下穿隧道的管片会产生影响,所以需在这两者的相互影响下来决定管片的加固措施,将两者的影响降到最低,这种情况目前国内少有。主要研究成果如下:1.对上部高铁动荷载作用下盾构隧道管片受力进行数值模拟分析,利用混凝土受拉疲劳寿命作为盾构隧道管片疲劳寿命的评价依据。2.对高压旋喷加固,管棚加固,桩基置换三种加固措施的隧道受力进行数值模拟计算,得出埋深10m-20m桩基置换管片疲劳寿命最高,管棚加固管片疲劳寿命次之,高压旋喷加固管片疲劳寿命最低。3.对不同围岩级别的盾构隧道受力进行数值模拟分析,得出盾构隧道管片疲劳寿命随围岩级别提高而延长的结论。4.对不同埋深的盾构隧道受力进行数值模拟,得到实际工程无需加固处理,隧道能正常安全使用的临界埋深为15m。5.根据工程实际情况,计算得出盾构隧道采用MJS法加固措施之后管片的疲劳寿命为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.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.43
本文编号：2488129
[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.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.43
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