Abstract:

A particle flow code based on the distinct element method (DEM) was adopted to analyze the tunnel excavation under interstratified rock mass. For a parameters calibration, an unconfined compression test was modeling firstly, and the simulated results can reflect the influence of the dip angle on the unconfined compression strength and the Young's modulus. In addition, the numerical analysis of the stress around a circle excavation was compared with the analysis solution, and it indicates that the adopted model is suitable to analysis the excavation problem of a tunnel. Finally, a tunnel excavation under interstratified rock mass was simulated with the dip angle 0°,45°, and 90°, and the results show that the adopted model can imitate the failure and engineering problems during tunneling in Taiwan, such as squeezing, block falling, buckling and caving. 

Key words: distinct element method  , tunnel  , interstratified rock mass