摘要
通过ANSYS软件对万丈山隧道开挖过程中拱顶及周边的受力、变形进行了研究,并对比指导施工。结果表明:隧道开挖面实际应力与初支混凝土有效强度的最不利比值出现在第9 d,施工进行到第17 d以后,拱顶下沉速率小于0.14 mm/d,周边收敛速率小于0.046 6 mm/d,结合"收敛-约束"原理和规范对于隧道二衬支护时间的确定准则可知,此时为二衬的合理施作时间。
The ANSYS is used to investigate the displacement and stress of tunnel crown and surroundings, which are compared with the site monitoring and furthermore guiding the construction of Wanzhangshan tunnel. The results show that the ratio between tunnel stress and concrete strength is the most unfavorable in the 9th day,the subsidence rate of the crown is less than 0.14 mm/d and convergence rate of the surrounding rock is less than 0.046 6 mm/d after the 17 th day, it is the reasonable time when combined with the convergence-confinement method and the standard about determining the time for secondary lining in tunnel.
出处
《煤炭技术》
CAS
北大核心
2016年第4期42-44,共3页
Coal Technology
基金
山西省回国留学人员科研资助项目(2013-050)
2012年高等学校博士学科点专项科研基金联合资助课题(20121402110013)
关键词
“收敛-约束”法
开挖模拟
二次衬砌
施作时机
convergence-confinement method
excavation simulation
secondary lining
construction time
