高校地质学报2016，Vol.22Issue(3)：580-588,9.DOI:10.16108/j.issn1006-7493.2016066
不同围压下岩石抗压强度与变形参数尺寸效应的数值模拟
Numerical Simulation on the Size Effect of Compressive Strength and Deformation Parameters of Rock Materials Under Different Confining Pressures
摘要
Abstract
The compressive strength and deformation parameters of rock materials are important indices of rock engineering. Because a rock is a typical heterogeneous material, its strength and deformation parameters vary with sample sizes. In this paper, the size effects of rock materials under different confining pressures were numerically studied using PFC2D code. The simulation results indicate that (1) rock strength, peak strain and compressive modulus decrease with increasing specimen sizes, whereas the change of specimen size has little effect on the failure mode of these rock specimens. (2) rock strength, peak strain and compressive modulus increase with the confining pressures. Among them, the rock strength and peak strain have linear relations with the confining pressures. In addition, the failure of rock specimens gradually changes from the splitting mode into shear failure mode with the increase in confining pressures. (3) the increments of rock strength and peak strain for different size specimens at the same confining pressure range are approximately the same. Meanwhile, these two parameters increase with confining pressures. Therefore, the size effect of the rock strength and peak strain at high confining pressure becomes weak. In addition, the increasing ratios of compressive modulus for the corresponding scenarios are similar, which causes the confining pressure to have little impact on the size effect of compressive modulus.关键词
岩石/压缩强度/变形参数/尺寸效应/围压Key words
rock/compressive strength/deformation parameters/size effect/confining pressure分类
建筑与水利引用本文复制引用
唐伟,赵晓豹,雷继辕,袁彬,刘汉文..不同围压下岩石抗压强度与变形参数尺寸效应的数值模拟[J].高校地质学报,2016,22(3):580-588,9.基金项目
国家自然科学基金课题（41172241；41372266）资助 （）
