论文部分内容阅读
利用自主开发的基于无网格法的岩石力学计算分析程序,采用Mohr-Coulomb破坏准则,考虑材料塑性屈服后的软化特性,研究单轴压缩条件下含一个缺陷的岩石试样的变形特性,探讨含缺陷材料的岩石变形局部化的演化规律。计算结果表明,岩石试件的破坏是一个渐进破坏的过程;加载过程中试件中的缺陷弱粒子首先出现粒子破坏并产生声发射,随加载进行试件产生微裂隙并扩张形成一个变形局部化带,局部化带扩张、发展,最终形成一个明显的剪切破坏带,缺陷粒子对试件的破坏起到了控制作用。岩石的声发射记录了岩石材料的塑性破坏过程,岩石试件的剪切破坏带与塑性区的发展具有非常类似的规律,但塑性区面积要大于剪切破坏带,从所处位置来看剪切破坏带位于塑性区之内,通过研究声发射特征信息发现变形局部化发生在应力-加载步(应变)达到峰值强度前。
Based on the mesh-free method of rock mechanics calculation and analysis developed by ourselves, the Mohr-Coulomb failure criterion is used to study the deformation characteristics of rock samples with one defect under uniaxial compression considering the softening behavior after plastic yielding Evolution of Rock Deformation Localization with Defective Materials. The results show that the failure of the rock specimen is a progressive failure process. During the loading process, the weak particles in the specimen firstly appear particle damage and generate acoustic emission. When the specimen is loaded, micro-cracks are generated and expand to form a deformation localization Belt, the localization with the expansion, development, and ultimately the formation of a clear shear damage zone, defect particles played a controlling role in the destruction of the specimen. Acoustic emission of rock records the plastic failure process of rock materials. The shear failure zone of rock specimens has a very similar rule with the development of plastic zone. However, the area of plastic zone is larger than that of shear failure zone, The failure zone is located within the plastic zone. It is found by studying the characteristics of acoustic emission that the deformation localization occurs before the stress-loading step (strain) reaches the peak intensity.