This study reports on the mixed-mode behavior of desiccation cracks in a clayey rock front gallery. As most digital image correlation (DIC) algorithms have access to the full-field measurements of the displacements and strains, the improvements in DIC now allow the automatic detection of the jumps in the displacements induced by the opening and sliding of desiccation cracks without imposed initial conditions. This new local data allows us to specifically study the kinematics of the crack lips at each deformed state. These results allow us to quantify the opening and sliding of cracks and the cracked area during the desaturation and saturation paths of the rock mass. Amongst other results, a linear trend between the deformation of the solid phase and the crack porosity is observed. The results also demonstrate that most desiccation cracks evolve in a mixed-mode, the values of the shear component are of the same order of magnitude as the opening values.

本研究报告了粘土岩前廊中干燥裂缝的混合模式行为。由于大多数数字图像相关 (DIC) 算法都可以访问位移和应变的全场测量，因此 DIC 的改进现在允许自动检测由干燥裂缝的打开和滑动引起的位移跳跃，而无需施加初始状况。这一新的局部数据使我们能够专门研究裂纹唇在每个变形状态下的运动学。这些结果使我们能够量化裂缝的打开和滑动以及在岩体的去饱和和饱和路径。在其他结果中，观察到固相变形和裂纹孔隙率之间的线性趋势。结果还表明，大多数干燥裂缝以混合模式发展，剪切分量的值与开口值处于同一数量级。