Abstract：To investigate fracturing characteristic and cycle loading and unloading damage mechanism of the rock with rein detects in the sliding zone of Daguangbao(DGB) landslide，the surface area of veins were counted based on the technology of image recognition，and uniaxial compression and unloading tests were carried. The test results show that the interfaces of the vein mass are easy to form the potential failure plane of the specimens，and that the loading and unloading stress in the elastic stage can obviously cause the damage of the specimen and reduce the strength of the rock. The area ratio of vein mass has a great influence on the Poisson?s ratio，damage rule and peak strength of the specimen. Under the same loading and unloading condition，the bigger the area ratio of vein mass，the greater the Poisson?s ratio and damage are and the lower the peak strength is. The smaller the area ratio of vein mass，the smaller the Poisson?s ratio and the damage of the rock are and the lower the peak strength. The results reveal that the stress concentration caused by the non-compatible deformation of the veins during the earthquake has a very obvious effect on the damage and strength degradation of the rock.
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2019, Vol. 38 
