裂隙岩体的细观动力损伤模型

通过分析单组裂隙细观特征对应力波传播特性的影响机理,提出了表达裂隙细观特征对波速影响的半连续介质动力损伤模型及表述其对波幅影响的细观损伤阻尼模型;并应用室内模型试验进行了对比验证,对比结果说明所提出的细观损伤模型较当前S. Valliappan和E. P. Chen的最新等效连续损伤模型更接近于试验结果。

DYNAMIC MESO- DAMAGE MODEL OF JOINTED ROCKMASS

Based on the wave propagation theory on the jointed media,a dynamic damage model of the cracked medium is developed with the theoretical analysis and model test to investigate the jointed rockmass behavior under the blasting pulse. The presented model is capable of capturing the meso-behavior of dynamic response of the joints and the wave propagation properties under the blasting pulse,as well as the consideration of the degradation of the material stiffness and strength by the classical continuum damage mechanics theory. Comparisons between the proposed model and the test results are also discussed. The proposed model is checked by the model test and much better correlation between the theory and the test is obtained compared with the model of Chen or Valliappan. The dynamic meso-damage tensor model and the meso-damaged damping tensor model are also proposed based on the propagation model.