岩石损伤本构模型及稳定性分析中的应用

Damage Constitutive Model and Stability Analysis of Application

从损伤力学出发,考虑Mohr-Coulomb准则的损伤门槛以及Hoek-Brown强度准则的残余应力,基于岩石强度的Weibull分布假设,提出一种新的岩石损伤本构模型。结果表明此岩石损伤模型能较好地反映岩石应力-应变全曲线;通过损伤模型对岩体强度与变形规律的分析,计算出CDP模型参数,用ABAQUS进行数值模拟。从能量的角度研究结构的破坏过程,用最大弹性变形能来判别结构破坏。结果认为岩体的强度破坏实质上是稳定性问题,属于极值点失稳;并结合塑性区贯通验证合理性,对于研究岩石、混凝土损伤及稳定性有一定的参考价值。

Starting from the damage mechanics, considering the residual damage threshold ot Mohr-Coulomb criterion and Hock-Brown strength criterion of stress, rock strength based on the Weibull distribution assumption, a new damage constitutive model of rock was proposed, the results show that the rock damage model can well reflect the rock stress-strain curve. Through analysis on the deformation law of rock strength and damage model, the parameters of CDP model were caleuhed, numerical simulation with the ABAQUS was realized. The failure process of structure was studied from the angle of energy, tion of rock mass, the results that the strength to determine the structural damage by the maximum elastic deformadamage is essentially the problem of stability, which belongs to the extreme point buckling, combined with the run through of plastic zone to verify the rationality, for the study of rock, the damage of concrete and the stability of a certain reference value.