Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (2): 526-533.doi: 10.13278/j.cnki.jjuese.201702201

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Numerical Simulation and Experiment of the Damage Process of Heterogeneous Rock Under Ultrasonic Vibration

Yin Songyu1, Zhao Dajun1, Zhou Yu1, Zhao Bo2   

  1. 1. College of Construction Engineering, Jilin University, Changchun 130026, China;
    2. Songcheng Construction Engineering Quality Testing Center of Jilin, Jilin 132000, Jilin, China
  • Received:2016-06-04 Online:2017-03-26 Published:2017-03-26
  • Supported by:
    Supported by the National Natural Science Foundation of China(41572356)

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Abstract: During dynamic loading process, the evolution of internal micro defects will lead to a remarkable degradation in macro mechanical properties of rock. To improve the efficiency of rock fragmentation, the internal damage process of rock under ultrasonic vibration was analyzed using numerical simulation method combined with experimental verification. A two-dimensional heterogeneous model of rock was established by means of finite element method and statistical techniques, and the concept of damage incremental factor was put forward. Based on established model, the influence of rock heterogeneity on crack propagation under ultrasonic vibration was analyzed. Results showed that the damage process of rock material under ultrasonic vibration could be divided into three stages, which were initiation, propagation and connection. With the increase in uniformity coefficient, the speed of original crack propagation in rock increased gradually. There was a critical value of damage factor which was 0.005 4 in this study. When the damage factor was less than the critical value, there was no obvious relationship between the damage incremental factor and homogeneity coefficients. Otherwise, the damage incremental factor increased sharply with the increased homogeneity coefficient of rock, when the effect of homogeneity coefficient on the damage factor could not be ignored.

Key words: heterogeneity, crack extension, damage factor, numerical simulation, ultrasonic vibration

CLC Number: 

  • P634.1
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