Analysis of Deformation Behavior of Soil-rock Mixture Blocks Based on Digital Image Correlation Method
In order to investigate the deformation behavior of soil-rock mixture under load,the unconfined compressive test of soil-rock mixture was carried out,and the evolution law of displacement and strain(crack propagation)during uniaxial compression of samples with different stone content was analyzed by combining with digital image correlation method(DIC technology).The results show as follows:①With the loading process,the horizontal displacement of the sample is more obvious than that in the vertical direction,so the deformation ability is stronger in the vertical direction than in the horizontal direction,and the compressive performance is better than the shear performance;with the increase of the stone content,the vertical bearing capacity of the sample continues to increase.②With the increase of rock content,the inhibition effect of soil-rock ratio on the development of crack damage is stronger than the promotion effect,resulting in the increase of bearing capacity with the increase of rock content;③The displacement change stages of the whole sample under load mainly include initial compaction,elastic compression,elastoplastic(plastic expansion)and failure stages;at the peak load level,local crushing and falling off occurred in the affected area of the loading plate,which directly led to the crack expansion behavior of the sample and the fracture failure of the compaction property.④In the process of compression,the number of cracks in the sample gradually increased with the increase of the stone content,and the cracks were widely distributed,and the width of the cracks showed a trend of gradually increasing,and the strain cloud map could better represent the deformation and failure characteristics of the sample.⑤The application of DIC technology to the study of deformation and failure of soil-rock mixture in compression test can not only obtain the three-dimensional full-field displacement and strain of the observation surface during the failure process of the sample,but also intuitively reflect the generation,expansion and interconnection of the surface cracks of the sample.The evolution process can also determine the specific information such as the location,shape and expansion direction of the crack.
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