摘要
首先对悬吊锚筋桩数值模拟方法及力学参数取值问题进行分析,然后通过对一简单悬吊锚筋桩算例进行参数敏感性分析,分析结果表明:是否考虑灌浆环的摩擦作用对计算结果的影响很大,因此在悬吊锚筋桩的数值模拟过程中合理地模拟灌浆环非常重要。最后,对糯扎渡水电站1#导流隧洞进口0+015 m剖面不同条件下隧洞的开挖支护进行数值模拟,重点分析围岩和加固措施之间的相互作用及悬吊锚筋桩对顶拱围岩变形的影响。计算结果表明:悬吊锚筋桩能够有效地控制隧洞进口段顶拱的沉降变形。
Because of the stability problem of rock mass is very poor in the inlet and outlet section of tunnel,so some strong reinforcement measures should be applied;and the suspensory anchor-stake is one of these effective reinforcement methods.Firstly,the numerical simulation method and the mechanical parameters for suspensory anchor-stake are analyzed;then a simple case study for parameters sensitivity analysis of suspensory anchor-stake is carried out.The computing results show that,the results are influenced by the friction effect of grout is considered or not;so that,the rational simulation of grout is very important to the numerical simulation of suspensory anchor-stake.Finally,the numerical simulation of excavation and reinforcement of section 0＋015 m of diversion tunnel #1 at the Nuozhadu hydropower station under different conditions is carried out;the interaction of rock mass and suspensory anchor-stake,the deformation of tunnel crown rock mass influenced by the suspensory anchor-stake are analyzed.The computing results show that,the subsidence deformation of tunnel crown rock mass is controlled by the suspensory anchor-stake effectively.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2011年第10期2040-2048,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金青年基金项目(51009104)
四川大学青年教师基金资助课题(20082154)
关键词
隧道工程
加固方法
悬吊锚筋桩
数值模拟
应力变形
tunnelling engineering
reinforcement method
suspensory anchor-stake
numerical simulation
stress and deformation
