(1. Skate Key Laboratory of Disaster Reduction in Civil Engineering，Tongji University，Shanghai 200092，China；2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China； 3. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；4. PowerChina Chengdu Engineering Corporation Limited，Chengdu，Sichuan 610072，China)
Direct shear test on non-coplanar intermittent jointed rock was simulated by DEM，where a zero-thickness bond model containing rolling resistance based on experimental data was implemented. The influences of joint inclination angle，normal stress and joint spacing on mechanics and failure behaviors of non-coplanar intermittent jointed rock were investigated from both the macroscopic and microscopic points of view. The simulated results show that the failure of non-coplanar intermittent jointed rock is initiated by the formation of wing cracks，which start from the existing joints caused by tension stress. With the increase of shear displacement，the wing cracks propagate along the direction of the maximum compressive stress and break through the rock bridge in the end. The peak shear stress increases with the increase of joint inclination angle and normal stress，but almost remains unchanged with the increase of joint spacing.
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2015, Vol. 34 
