【摘要】 以数字散斑相关方法(DSCM)为手段,对含有转折非连通断层岩石破坏过程进行了试验研究。研究了岩石破坏过程中的试件表面的变形场演化过程。通过DSCM系统观测加载过程中的散斑图像,分析得到各个时刻的位移场及应变场,试验结果反映了转折非连通断层变形破坏的整个过程。结果表明,变形最初集中在岩石的弱性结构面上,并且变形破坏过程也受弱性面控制,裂纹尖端为应力集中程度最高的区域,新裂纹从这里产生并扩展,最后导致整个结构的破坏。利用变形场统计指标Cv值分析发现,该值在岩石均匀变形阶段变化较为缓慢,在岩石破坏前迅速上升,因此,可以利用Cv值对岩石破坏进行预测。更多还原

【Abstract】 The failure process of a rock with tortuously non-connected fault was experimentally studied using the digital speckle correlation method.The evolution of the deformation field during failure was studied.The DSCM system captured speckle images during the test process and then the deformation field at various moments was obtained.Experimental results show that deformation initially focuses on the weak structure of the rock surface and the failure process is also affected by the weak surface.Stress concentration locates at the crack tip and the new cracks generate and expand from there,finally leads to the whole structure damage.The statistical indication of deformation field,Cv value changes slightly during the homogenous deformation stage and increases rapidly before the rock failure,the Cv value can then be used as the prediction of the rock failure.更多还原