Stability analysis on shallow tunnel with floor lift under inclined ground by upper bound method
Luo Wei, Zhao Lianheng, Li Liang, Chen Jingyu and Tang Gaopeng
DOI:10.11835/j.issn.1674-4764.2015.02.013
Received October 24, 2014,Revised , Accepted , Available online June 25, 2015
Volume ,2015,Pages 79-84
- Abstract
On the basis of the energy conservation principle between internal and external work，failure mode of shallow tunnel under inclined ground was established and the expression of surrounding rock pressure was drawn using the limit analysis upper bound method.The correlation factors was analyzed by the computation examples. This results showed that due to the conservative design on Terzaghi limiting equilibrium method of rock support system in tunnelling，the limit analysis method without considering floor lift is medium，while considering floor lift had the greatest risk.The increase in inclination angle of slope surface had adverse effect on the shallow tunnel stability and the surrounding rock pressure increased with the reduce of geotechnical lateral pressure coefficient，or the increase of the buried depth and tunnel diameterLarger geotechnical cohesion force and friction angle were beneficial to improve the tunnel stability.