Influence of layer orientation and interlayer bonding force on mechanical behavior of shale under Brazilian test conditions 
  
作者Jianming He; Lekan Olatayo Afolagboye
期刊名称Acta Mechanica Sinica
2017
摘要The mechanical behavior of inherently anisotropic shale rocks under Brazilian test conditions are investigated in this study based on experimental studies and numerical simulations. The effects of the weak lamination planes and interlayer bonding force of these layers on the failure strength and fracture patterns are studied systematically. Numerical simulations using PFC2D (Particle Flow Code) based on the discrete element method showed a good agreement with the experimental results in the failure strength and fracture patterns. The shale revealed strong anisotropic behavior with the failure strength perpendicular to the lamination plane greater than failure strength parallel to lamination plane. The failure strength of the different interlayer bonding force against the layer orientations changed significantly. Four types of fracture patterns were observed: curved fracture, broken-linear fracture, layer-activated fracture and central-linear fracture. The observed fracture patterns are either or a combination of tensile and/or shear fractures. Increase in interlayer bonding strength decreased the quantity of micro cracks and this directly led to reduction in the anisotropic behavior. Overall the layer orientation and interlayer bonding force of the shale thus play a very important role in the anisotropic behavior of the shale.
关键词Anisotropy; Interlayer bonding force; Layer orientation; Mechanical behavior; Shale
点击率256

版权所有 中国力学学会 | 网站内容未经许可,不得转载。 | 京ICP备05039218号-1, 审核日期:2014年2月26日
北京市北四环西路15号  邮政编码:100190  联系电话:+86-10-82543905  传真:+86-10-82543907  电子邮箱: js@cstam.org.cn
总访问量: 212498