基于有限元分析的地铁车站明挖深基坑边坡稳定性分析  

Slope Stability Analysis of Open Cut Deep Foundation Pit of Subway Station Based on Finite Element Analysis

作　　者：王江荣[1] 梁永平[2] 赵振学[1] WANG Jiangrong;LIANG Yongping;ZHAO Zhenxue(College of Information Processing and Control Engineering,Lanzhou Petrochemical Polytechnic,Lanzhou Gansu730060,China;School of Civil Engineering,Lanzhou Petrochemical Polytechnic,Lanzhou Gansu 730060,China)

机构地区：[1]兰州石化职业技术学院信息处理与控制工程学院,甘肃兰州740060 [2]兰州石化职业技术学院土木工程学院,甘肃兰州740060

出　　处：《工程质量》2019年第1期54-58,64,共6页Construction Quality

基　　金：兰州市西固区科学技术局计划项目(西科发[2017]29号);兰州市科学技术局计划项目(兰财建发[2015]85号);甘肃省财政厅专项资金立项资助(甘财教[2013]116号)

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.

关 键 词：地铁车站 深基坑 支护结构 MIDAS/GTSNX 数值分析 变形 

分 类 号：TU458.4[建筑科学—岩土工程]