基于有限元分析的地铁车站明挖深基坑边坡稳定性分析
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摘要
以兰州地铁1号线奥体中心车站为研究对象,运用MIDAS/GTS NX有限元软件建立了车站深基坑二维数值模型,利用刚度折减法计算了不同工况条件下的基坑边坡稳定系数,模拟分析了地铁基坑在不同施工阶段发生的水平变形、边坡沉降、坑底隆起、围护桩变形等。综合分析表明在采用围护桩结构+钢支撑条件下地铁基坑边坡是安全稳定的,鉴于最小安全系数为1.3,为了地铁基坑的长期安全稳定,建议增加其他支护措施,或优化材料参数提高支护能力。
Taking the Lanzhou Metro Line 1 station as the research object,the two-dimensional numerical model of the station deep foundation pit is established by using the MIDAS/GTS NX finite element software.The stability coefficient of the foundation pit slope under different working conditions is calculated by the stiffness reduction method,and the subway foundation pit in different construction stages are simulated and analyzed on the horizontal deformation,slope settlement,bottom uplift of the pit and deformation of enclosure pile,etc.The comprehensive analysis shows that the slope of the subway foundation pit is safe and stable under the condition of retaining pile structure and steel support. In view of the minimum safety factor of 1.3,for the long-term safety and stability of the subway foundation pit,it is suggested to increase the other supporting measures,or to optimize the material parameters to improve the supporting capacity.
Taking the Lanzhou Metro Line 1 station as the research object,the two-dimensional numerical model of the station deep foundation pit is established by using the MIDAS/GTS NX finite element software.The stability coefficient of the foundation pit slope under different working conditions is calculated by the stiffness reduction method,and the subway foundation pit in different construction stages are simulated and analyzed on the horizontal deformation,slope settlement,bottom uplift of the pit and deformation of enclosure pile,etc.The comprehensive analysis shows that the slope of the subway foundation pit is safe and stable under the condition of retaining pile structure and steel support. In view of the minimum safety factor of 1.3,for the long-term safety and stability of the subway foundation pit,it is suggested to increase the other supporting measures,or to optimize the material parameters to improve the supporting capacity.
引文
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[2]吴南.基于深基坑施工期风险评估的安全指数研究[J].地下空间与工程学报,2011,7(3):604-608.
[3]赵卫龙.赵家条软土深基坑支护类型选择及稳定性分析[J].四川建筑,2014,34(4):139-141.
[4]宁波地区深基坑工程施工预警指标及风险评估研究[J].地下空间与工程学报,2012,8(s1):1396-1402.
[5]孙景凤.地铁车站基坑支护结构模拟分析及优化研究[J].市政技术,2012,30(3):131-133,136.
[6]郑强华.地铁车站明挖深基坑稳定性及变形控制研究[D].重庆:重庆大学,2016.
[7]穆丽静.兰州地铁马滩站深基坑稳定性及变形特性研究[D].兰州:兰州理工大学,2017.
[8]陈新民,罗国煜,夏佳.边坡稳定性类比评价的定量实现[J].工程地质学报,2000,8(2):244-248.
[9]李靖,周欣华,党进谦.黄土边坡稳定性图解法[J].岩土工程学报,1998,20(4):43-46.
[10]Fellenius W.Calculation of the stability of earth slope.Transactions of 2nd Congress on Large Dams[C].Washington.DC.1936,4:445-462.
[11]罗建林.基于极限平衡法的边坡稳定性分析及数值模拟研究[J].现代矿业,2013,33(8):56-58.
[12]许胜才.水泥土桩加固边坡变形破坏机理与稳定性研究[D].南宁:广西大学,2016.
[13]王震.地铁车站深基坑开挖围护结构稳定性数值模拟分析[D].西安:西安科技大学,2013.
[14]吴兴昌.深基坑开挖数值模拟分析与稳定性分析计算[D].长春:吉林大学,2016.
[15]谢方媛.深基坑开挖变形及稳定性数值模拟研究[D].天津:河北工业大学,2013.
[16]亚黎琨·亚琛.强度折减法在基坑边坡稳定性分析中的应用[J].四川水泥,2016,38(8):275-277,33.