微孔洞缺陷岩石轴压下弹塑脆性模型损伤研究

开展孔洞缺陷介质破坏行为的研究,是当今固体力学特别是岩石力学研究的重要课题之一,具有重要的学术和工程意义。采用细观单元的弹塑脆性损伤本构,考虑材料的非均质特性,对不同均质度、不同试样尺寸孔洞缺陷建立了基于细观力学的岩石弹塑脆性损伤模型,研究了岩石在单轴压缩荷载下的细观弹塑性损伤破坏行为,通过将有限元计算结果与物理实验对比,分析孔洞缺陷介质破坏行为,得出试样尺寸和均质度对岩石损伤影响的一般规律。

Study on elastoplastic-brittle model damage under axial compression in rocks with micro-cavity defect

To investigate the brittle failure behaviour of medium containing flaws and pores is one of the important research fields of solid mechanics, especially in rock mechanics. It is significant also for engineering and academic study. This paper uses micro-element elastoplastic-brittle damage constitutive, taking account of the heterogeneous characteristics of materials, based on different degrees and different specimen sizes holes homogeneous, micro-mechanics of elastoplastic-brittle damage model of rock were put forward. Study of rock under uniaxial compression loading elastoplastic meso-damage evolution behavior by finite element calculations and comparison of physical experiments, analysis of cavity defect media destruction were carried out, which concluded the general laws of sample size and uniform quality of rock damage effects.