采用激光数字散斑光测方法,对泥砂岩和泥岩这两种不同岩性的软岩试件在单轴受压状态下变形局部化的全过程进行了实验研究.经过一系列散斑干涉的相关分析,实时跟踪了软岩应变局部化的变化规律,观测到了软岩应变局部化带的"转动"全过程,并确定了局部化起动的时刻及局部化带内的变形速度.当荷载增加到峰值强度的60%后,泥砂岩出现稳定的变形局部化带.与泥砂岩的单斜局部化带不同,泥岩产生了共轭的交叉局部化带,并沿局部化带发生断裂破坏.实验结果表明,软岩的变形局部化起动时间要早于强度较高的脆性岩石,且软岩的局部化发展过程比脆性岩石稳定、持续时间长.%Contrast test research on deformation localization of soft rocks under uniaxial pressure was investigated by laser digital speckle method. Through a series of correlative analyses of speckle interference, the transforming laws of soft rock's deformation localization were tracked and measured temporally, the whole “revolving” process of the deformation localization area of the soft rock was observed at first time. Also the starting time of localization were confirmed as well. When the load was increased to 60％ of peak strength ,stable deformation band appeared on mud-sand rock sample. The mudstone sample generated conjugated deformation band, it is defferent from mud-sand rock sample.The results show that the deformation localization of soft rock appeares earlier than hard rock.
展开▼
