Experimental Study on Mechanical Properties of Granite at Different Damage Degrees

摘要

Rock mechanics servo testing machine was used to test the uniaxial compression of granites with different degrees of damage. Based on the experimental results of stress-strain curves, the influence of different damage degrees on the mechanical properties of granite was analyzed. The results show that compared with intact granites, with the increase of damage degree, the mechanical properties of granites are obviously decreased. Their peak strengths and peak strains were significantly reduced, and the decrease was closely related to the degree of damage. As the damage degree reached 0.743%, the peak strength of the rock samples decreased significantly, the decline amplitude gradually increased, and then the peak intensity decreased slowly. The greater the damage, the greater the damage effect, the peak strength of the granite is greatly reduced, and the peak strain of the rock sample is significantly reduced. When the damage degree is less than 0.513%, the peak strain is greatly reduced. When the damage degree is higher than 0.513%, the decrease in peak strain decreases gradually. As the degree of damage increases, the strength of the rock sample decreases, the initial crack closes in a shorter time and a new crack is immediately created, resulting in a gradual reduction in the strain at failure.