基于数字散斑技术的压？布袅严堆姨迤苹倒？程分析
Failure process analysis of compression？？shear fractured rock mass？？based on digital speckle technique

为了研究压？布粲α？环境下裂隙岩体内部的裂纹起裂、扩展及破坏过程，采用水泥砂浆材料制作含不同倾角的非平行裂隙试样，并在刚性试验机上进行限制性压剪试验。与此同时，采用高分辨率电荷耦合器件（CCD）相机连续捕捉图像，并采用高精度数字散斑技术对变形图像进行处理，得到压剪加载过程中试样表面的应变场及位移场，进而获取非平行裂隙间的破坏过程。研究结果表明：压？布粲α？共同作用下非平行裂隙试样的破坏形式基本可以分为脆性破坏和非脆性破坏；脆性破坏下，在加载初期试样内部的裂隙尖端并无翼裂纹产生，且试样破坏迅速，加载曲线峰后段加载力突然下降至残余值；非脆性破坏下，试样加载曲线可分为4个阶段，在压密阶段试样内部无裂纹产生，而在非线性变形阶段试样内部预制裂隙尖端将衍生出翼裂纹，加载过程中试样并未发生突然破坏，且加载曲线的峰后阶段加载力持续下降；此外，不同的裂隙倾角导致试样呈现出不同的破坏模式，当裂隙倾角为0°和180°时，试样内部断续裂隙间虽形成了贯通，但其主要破坏面是试样中部的贯通剪切破坏面。对于倾角为45°、90°和135°的情况，试样内部并未形成贯通式的破坏面，而是裂隙尖端衍生出的裂纹扩展至试样边界导致的破坏。
To investigate the crack initiation, propagation and failure process of jointed rock mass under compression？？shear stress environment, non？？parallel fracture specimens with different dip angles were made from cement mortar materials, and the limited compression shear tests were carried out on a rigid experimental machine. At the same time, the high resolution charge coupled device (CCD) camera was used to capture images continuously. The deformation image was treated with high precision digital speckle technique, the strain field and displacement field of the surface of specimens during compression and shear loading were obtained, and then failure process between non？？parallel fracture was obtained. The results show that the failure modes of non？？parallel fracture specimens under the compression？？shear stress can be divided into brittle failure and non？？brittle failure. For the brittle failure, there is no wing crack at the crack tip of the specimen at the initial loading stage, and the specimen is destroyed rapidly. The loading force suddenly decreases to the residual value after the peak of the loading curve. For non？？brittle failure, the loading curve of the specimen can be divided into four different stages. During the compaction stage, there is no crack in the specimen, but in the nonlinear deformation stage, the crack tip of the precast crack will be derived from the wing crack. No sudden failure occurs during the loading process, and the loading force decreases continuously after the peak of the loading curve. In addition, different fracture dip angles can lead to different failure modes. When the dip angles of fracture are 0° and 180°, there is a continuous connection between the intermittent cracks, but the main failure surface is the through shear failure surface in the middle part of the specimen. For the specimens with dip angles of 45°, 90° and 135°, no through failure surface is formed inside the specimen, the crack derived from the crack tip which extends to the boundary of the specimen causes the failure. ？？1 tab？？, 12 figs, 26 refs