用 CT图像定量分析岩石受力损伤破坏过程的难点 ,是难以知道岩石内部的绝对密度变化量。提出了密度损伤增量的新概念 ,推出了 CT数与密度损伤增量的定量关系式 ,并把 CT图像转换成密度损伤增量图像。通过与基于灰度变化的传统的 CT图像分析方法比较 ,说明密度损伤增量图像的优越性在于不仅可定量分析受力岩石的损伤破坏过程 ,而且图像本身具有明确的物理意义 The difficulty of using CT images to quantitatively analyze the process of rock damage damage is that it is difficult to know the absolute density change inside the rock. A new concept of density damage increment was proposed. The quantitative relation between CT number and density damage increment was deduced and the CT image was transformed into density damage increment image. Compared with the traditional CT image analysis method based on gray level variation, the advantage of incremental density damage images is that they can not only quantitatively analyze the damage and destruction process of stressed rock, but also the image itself has a clear physical meaning