考虑尺寸效应的裂隙岩体强度损伤力学研究

A Study on Strength Damage of Fissured Rock Mass with Scale Effect Considered

根据岩体裂隙网络的层次性分布特点,研究岩体裂隙分形结构的标度不变区间,以此划分岩体宏观损伤的不同层次。通过确定相对无损尺度,利用分形结构的标度不变性,在连续介质损伤力学框架内,预测岩体强度损伤,并根据统计强度理论,预测在荷载条件下岩体强度的损伤演化。研究表明,岩体强度的初始损伤及其演化存在一定的尺度效应。

According to the feature of hierarchy distribution of fracture network of rock mass, the constant scale section of fractal structure of rock mass fracture is studied to grade the macroscopic damage of the rock mass. Through determining the scale for relative damagelessness and making use of the constancy of the fractal structure, the damage of rock mass strength is predicted based on continuous damage mechanics. On the basis of statistic strength theory, the damage evolution under loading condition is predicted as well. The study shows that there is the initial strength damage and its evolution of rock mass have scale effect.