关键词: 3D-DIC;预制孔洞;单轴压缩;位移;应变;

Abstract: 3 D-DIC(three-dimensional digital image technology) observation system was used to study the whole process of uniaxial compression failure of marble with prefabricated holes. The whole process of the generation,propagation and penetration of surface cracks of the specimen under uniaxial compression was recorded. The evolution process of displacement field and strain field in the observation area of the failure process of marble with prefabricated hole was calculated and analyzed,as well as the time displacement strain curve. The results showed that in the stage of elastic deformation,the strain field appeared localization band,and the displacement field appeared obvious zoning phenomenon. The boundary zone and the localization band were often the crack propagation and penetration regions. In the stage of brittle failure,some specimens had a very sudden phenomenon,namely the time from the initiation of surface crack to the breakthrough is very short,and the displacement and strain will change abruptly. 3 D-DIC technology provides an effective method for rock mechanics research and rock failure prediction.

Key words: 3D-DIC; prefabricated hole; uniaxial compression; displacement; strain;