基于数值试验的节理岩体变形特性REV研究

 根据随机节理网络程序，得到多组随机节理岩体数值模型，通过数值试验获得多组随机节理岩体模型的应力–应变曲线。首先在试件尺寸及节理概率分布特征参数不变时，获得在一定围压下试件的应力应变曲线变化规律。然后考虑试件尺寸变化对岩体应力–应变曲线的影响。通过上述2类工况数值模拟结果进行分析发现，试件尺寸小时，变形曲线比较分散，随着尺寸的增大，曲线趋于一致，说明节理岩体变形曲线存在尺寸效应，岩体变形特性的特征尺寸可以由数值试验获得。

RESEARCH ON REPRESENTATIVE ELEMENTAL VOLUME (REV) OF DEFORMATION CHARACTER OF JOINTED ROCK MASS BASED ON NUMERICAL EXPERIMENT

According to random joint program，several groups of numerical models on random joint rock mass are obtained. The stress-strain curves of these models are gained by numerical test. Firstly，the changing law of the deformation curve on these numerical samples under certain confining pressure is considered under the same probabilistic distribution parameters of random joint and the same sample size conditions. Then，the effect on the stress-strain curve caused by sample size is considered. Through the above two kinds of computing schemes，it is found that the deformation curves become dispersal when the sample is small，and become uniform with the enhancement of size. It illustrates that the size effect exists among these curves，and the size of rock mass deformation feature can be obtained by numerical test.