中南大学学报（自然科学版）2017，Vol.48Issue(2)：484-490,7.DOI:10.11817/j.issn.1672-7207.2017.02.028
初始损伤对脆性岩石抗压力学性质的影响
Influences of initial damage on mechanics of brittle rock under compressed stress
摘要
Abstract
The initial damage definition for rock and the method were presented based on current isotropic damage constitutive model. The initial damage was expressed as the inferiority degree of the initial modulus of rock compared with the undamaged modulus. The uniaxial compressive tests for basalt with different initial damages were carried out. The influences of initial damage of rock on the relationship among the uniaxial compressive stress and the uniaxial compressive strain, the uniaxial compressive strength, the failure strain, the initial value of Poisson's ratio, the strain softening, and so on, were quantitatively analyzed. The rule and fitting formula about the mechanical parameters (including the change of the uniaxial compressive strength, the initial Poisson ratio, and so on) changing with the initial damage of rock were presented. The results show that only their initial damage value surpasses the damage threshold value which is corresponding to the peak stress of undamaged rock under uniaxial compressive loading, and the uniaxial compressive strength of initial damage rock samples decreases significantly with the increment of the initial damage. The strain corresponding to the peak stress increases almost linearly with the increment of the initial damage. The initial Poisson ratio shows exponential growth with the initial damage. The brittle failure after peak stress is remarkable with the decrement of the initial damage of rock.关键词
岩石/损伤/单轴抗压强度/弹性模量/脆性破坏Key words
rock/damage/uniaxial compressive strength/elastic modulus/brittle failure分类
建筑与水利引用本文复制引用
陈乐求,张家生,陈俊桦,陈积光..初始损伤对脆性岩石抗压力学性质的影响[J].中南大学学报（自然科学版）,2017,48(2):484-490,7.基金项目
国家自然科学基金资助项目(51308210)(Project(51308210) supported by the National Natural Science Foundation of China) （51308210）
