大阪山隧道三台阶七部开挖法数值模拟与施工监测  

RESEARCH ON NUMERICAL ANALYSISON AND CONSTRUCTION MONITORING OF THE THREE-BENCH SEVEN-STEP EXCAVATION METHOD IN DABANSHAN TUNNEL

作　　者：裴巧玲[1] 华珊[1] 严松宏[2] PEI Qiaoling;HUA Shan;YAN Songhong(Huaqing College,Xi’an Univ.of Architecture and Technology,Xi’an 710043,China;School of Civil Engi.,Lanzhou Jiaotong Univ.,Lanzhou 730070,China)

机构地区：[1]西安建筑科技大学华清学院,西安710043 [2]兰州交通大学土木工程学院,兰州730070

出　　处：《低温建筑技术》2018年第6期102-106,111,共6页Low Temperature Architecture Technology

基　　金：院级教改项目(JG1503)

摘　　要：以大阪山隧道为依托,采用有限元数值模拟和现场监测数据相结合的方法,对该隧道Ⅳ级围岩的三台阶七步开挖法进行了数值模拟,分析了在不同开挖阶段围岩位移场的变化规律,发现隧道拱顶、拱脚、拱腰、拱底处应力较为集中,且拱顶、拱底处竖向变形均较大,左侧拱脚,右侧拱腰和右侧仰拱脚处也产生了较大水平位移。以此确定了施工现场重点监测和加固区。结合实测监控量测数据,利用加权回归分析方法对监测数据进行处理,得出各监测点实测围岩变形值。通过对数值模拟结果与现场监测数据的对比分析,判定隧道围岩的稳定状态,结果表明,利用有限元对隧道进行数值模拟和加权回归分析对监测数据进行处理,两种方法相结合对判断三台阶七部开挖法的安全性具有很好的效果。Based on the Dabanshan tunnel and combining the methods of finite element numerical simulation and field monitoring data,the paper has done some research on numerical analysison of the three-bench seven-step excavation method IV level surrounding rock,Analysis of the changing rule of the displacement field of surrounding rock in different stages excavation,indicating that the stress of the tunnel dome,arch foot,arch waist and arch bottom is concentrated,and the vertical deformation of the dome and arch bottom is larger.At the left arch,a large horizontal displacement is produced in arch foot,which also generated in the right arch waist and the right arch foot.Then determine the focus and reinforcement of the construction site.In combination with the measured data,the monitoring data is processed by means of a weighted regression analysis method to obtain the measured deformation values of the surrounding rock of each monitoring point.It is determined that the steady state of tunnel surrounding rock by the comparative analysis of the result of numerical simulation and the on-site monitoring data,and the results show that the numerical simulation and motoring data of the tunnel are treat by finite element method and weighted regression analysis respectively,and the two methods combine with good effect on the security of the threebench seven-step excavation method.

关 键 词：大跨度隧道 监测数据 数值模拟 三台阶七步开挖法 

分 类 号：TU451[建筑科学—岩土工程]