隧道穿越堤防时的堤顶面沉降规律研究
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摘要
基于上海长江隧道工程,用数值模拟方法对隧道穿越堤防时的堤顶面沉降规律进行了研究。研究发现,隧道半径和隧道收敛率对堤顶面沉降的影响相对简单,而堤身弹性模量、隧道上覆土层厚度、隧道间距对堤顶面沉降的影响相对复杂;堤顶面沉降随隧道半径和隧道收敛率的增大而增大;隧道正上方堤顶面最大沉降和最大差异沉降随堤身弹性模量的增大而减小,最后趋于一稳定值;隧道正上方堤顶面最大沉降和最大差异沉降开始时都随着隧道上覆土层厚度的增大而减小,当覆土厚度大于20 m之后堤顶面沉降减小幅度趋缓;在隧道间距小于10 m时两隧道之间的堤顶面沉降随隧道间距的增大而增大,而在两隧道间距大于10 m时堤顶面沉降随隧道间距的增大而减小;堤顶面最大沉降和最大差异沉降都和隧道间距呈S形关系。结果表明,当隧道穿越堤防时,可采取增大堤身弹性模量、减小隧道收缩率、采用适当的隧道半径、覆土厚度和间距来减小堤顶面沉降。
Based on Shanghai Yangtze River tunnel,the settlement rules of dike top plane were studied when tunnel penetrate dike with numerical simulation method.It is found that the radius and convergence rate of tunnel have relative simple influence on settlement of dike top plane,while elastic modulus of dike,thickness of soil clay uplapping tunnel and distance between two tunnels have relative complicated influence on settlement of dike top plane;the settlement of dike top plane increase when the radius and convergence rate of tunnel increase;the maximal settlement and maximal difference settlement of dike top plane right above tunnel decrease when the elastic modulus of dike increase,and tend to a steady value;the maximal settlement and maximal difference settlement of dike top plane right above tunnel decrease when the thickness of soil clay uplapping tunnel increase,and then decrease slowly when the thickness of soil clay uplapping tunnel is over 20 m;the settlement of dike top plane increase with the increment of distance between two tunnels when the distance is less than 10 m,and it is inverse when the distance is over 10 m;the maximal settlement and maximal difference settlement of dike top plane have S shape relation with the distance between two tunnels.The following conclusions can be drawn that the measures such as enlarging the elastic modulus of dike,reducing the convergence rate of tunnel,taking appropriate radius,thickness of soil clay uplapping tunnel and distance between two tunnels,in order to reduce the settlement rules of dike top plane when tunnel penetrate dike.
Based on Shanghai Yangtze River tunnel,the settlement rules of dike top plane were studied when tunnel penetrate dike with numerical simulation method.It is found that the radius and convergence rate of tunnel have relative simple influence on settlement of dike top plane,while elastic modulus of dike,thickness of soil clay uplapping tunnel and distance between two tunnels have relative complicated influence on settlement of dike top plane;the settlement of dike top plane increase when the radius and convergence rate of tunnel increase;the maximal settlement and maximal difference settlement of dike top plane right above tunnel decrease when the elastic modulus of dike increase,and tend to a steady value;the maximal settlement and maximal difference settlement of dike top plane right above tunnel decrease when the thickness of soil clay uplapping tunnel increase,and then decrease slowly when the thickness of soil clay uplapping tunnel is over 20 m;the settlement of dike top plane increase with the increment of distance between two tunnels when the distance is less than 10 m,and it is inverse when the distance is over 10 m;the maximal settlement and maximal difference settlement of dike top plane have S shape relation with the distance between two tunnels.The following conclusions can be drawn that the measures such as enlarging the elastic modulus of dike,reducing the convergence rate of tunnel,taking appropriate radius,thickness of soil clay uplapping tunnel and distance between two tunnels,in order to reduce the settlement rules of dike top plane when tunnel penetrate dike.
引文
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[2]沈细中,冯夏庭.山东东明黄河标准化堤防裂缝成因数值分析[J].岩石力学与工程学报,2007,26(2):347-354.
[3]黄雨,八嶋厚,尺田和秀,等.堤防地基地震液化的数值模拟[J].工程力学,2007,24(12):82-87.
[4]王荣彪,金清山.上海长江隧道工程岩土地质与施工沉降控制[J].上海地质,2008(2):18-22.
[5]李炜明.武汉长江隧道施工对周边建筑影响的研究[M].武汉:华中科技大学,2006.
[6]靳世鹤.南京长江隧道不良地质对施工的影响及应对措施[J].地下工程风险防范技术,2006.
[7]程鑫.马钢新区慈湖河段5#电缆隧道地基处理及边坡支护施工技术[J].安徽冶金科技职业学院学报,2007,17(3):32-35.
[8]李玲玲,王立忠.新建海堤下盾构隧道施工技术措施及监控[J].岩土工程学报,2007,29(7):995-1003.
[9]Li Y,Emeriault F,Kastner R,et al.Stabiltiy analysis oflarge slurry shield-driven tunnel in soft clay[J].Tunnellingand Underground Space Technology.2009,24:472-481.
[10]Hsiao F Y,Wang C L,Chern J C.Numerical simulation ofrock deformation for support design in tunnel intersectionarea[J].Tunnelling and Underground Space Technology,2009,24:14-21.
[11]贾瑞华,阳军生,马涛,等.既有管线下盾构施工地层沉降监测和位移加载数值分析[J].岩土工程学报,2009,31(3):425-430.
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