摘要
为确定合理的隧道围岩应力场和参数,采用位移反分析法进行分析.结合现场监测数据和FLAC3D有限元软件进行反演分析和围岩变形数值模拟.研究结果表明:运用FLAC3D仿真模拟开挖,隧道拱顶是危险点,开挖之后拱顶上部围岩下沉值较大;通过现场实际监测拱顶点的位移分析可知,当从第六天之后围岩趋于稳定下沉值22 mm,回归分析确定了拱顶下沉值随时间的变化指数曲线关系;根据位移反分析确定围岩弹性模量为2.5 GPa适合该工程条件,围岩其他参数也可按照该方法进行确定.
Displacement back analysis was used to determine the reasonable stress field and parameters of tunnel rock, Combing field monitoring data and FLAC3 D,back analysis and numerical Simulation of rock deformation were studied. The results showed： with the method of FLAC3 D numerical simulation, the vault of the tunnel was dangerous point, partial rock above the vault sink larger after excavation; with displacement analysis of vault points by field monitoring, we can know that the rock tend to stabilize and the sinking value was 22 mm after the sixth day, regression analysis determined exponential curve relationship of the sinking value with the change of time;According to the displacement back analysis determined the elastic modulus was 2.5 GPa which suitable for the engineering conditions, Other parameters of rock can be determined by this method.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2016年第6期603-606,共4页
Journal of Liaoning Technical University (Natural Science)
基金
国家自然科学基金项目(51274111)
辽宁省教育厅基金项目(L2013137)
关键词
隧道围岩
数值模拟
反分析
围岩参数
回归分析
tunnel rock
numerical simulation
back analysis
rock parameters
regression analysis
