摘要
隧洞开挖过程中,地下水渗流作用引起围岩应力重分布,其对围岩稳定性的影响不容忽视.依托日照市沭水东调引水隧洞工程,基于渗流-应力耦合理论,利用MIDAS-GTS有限元分析程序,对有无渗流作用下隧洞的开挖过程进行仿真分析,得出了隧洞开挖过程中围岩孔隙水压力分布及围岩变形规律.计算结果表明:开挖使一定范围内的围岩孔隙水压力降低,并导致围岩内孔隙水压力呈环形带状分布;渗流-应力耦合下围岩位移空间分布规律与未考虑孔隙水压力时相似,耦合作用对拱顶的竖向位移影响最大.
The stress redistribution of surrounding rock caused by groundwater seepage in the process of tunnel excavation has significant influence on the stability of surrounding rock.Based on the diversion tunnel project of water transferring in Rizhao,a numerical modeling analysis is conducted on the excavation process of diversion tunnels with and without seepage using the finite element analysis software MIDAS-GTS with the coupling theory of seepage and stress.The redistributions of pore water pressure and deformations in surrounding rock during the process of tunnel excavation are obtained.The calculation results show that the pore pressure around the tunnel decreases owing to excavation and the distribution shape is annular and zonal.The displacement distribution in surrounding rock is similar for coupling and uncoupling cases but in the former a larger influence is exerted on the vertical displacements of the vault.
出处
《浙江工业大学学报》
CAS
北大核心
2016年第2期207-211,共5页
Journal of Zhejiang University of Technology
基金
清华大学水沙科学与水利水电工程国家重点实验室资助项目(sklhse-2014-C-02)
浙江省科技厅公益基金资助项目(2012C21105)
关键词
引水隧洞
开挖
渗流-应力耦合
孔隙水压力
位移
diversion tunnel
excavation
coupling of seepage and stress
pore pressure
displacement
