基于PFC的堆石体尺寸效应研究  

A Study of Scale Effect of Rockfill Based on PFC2D

作　　者：饶国风[1] 常晓林[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,武汉430072

出　　处：《中国农村水利水电》2011年第11期88-90,共3页China Rural Water and Hydropower

摘　　要：采用PFC2D软件,对小浪底坝过渡料进行数值试验研究。通过对不同试样直径D对应的不同最大粒径的过渡料进行双轴试验,分析了试样尺寸对应力-应变-强度特性的影响,研究了室内试验存在的尺寸效应。结果表明,在相同围压下,随着试样尺寸及其对应的最大粒径的增大,初期弹性模量有所增加;同一试样,随着围压的增加,初期弹性模量有所增加,同时代表堆石体体变形能力的指标泊松比随之降低。Testing studies are made of transition zone material of sandstone for Xiaolangdi rockfill with PFC2D. Through tests of transition zone materials with different sample sizes and different maximum sizes of grain, the influences of D, dmax on stress-strain- strength characteristics are analyzed to study the scale effect that exists in laboratory tests. The results indicate that initial tangent e- lastic modulus increases as the sample size increases. For the same size sample, initial tangent elastic modulus increases as the confi ning pressure increases, while the position ratio decreases as the confining pressure increases.

关 键 词：双轴试验 颗粒流 堆石料 缩尺效应 

分 类 号：TV314[水利工程—水工结构工程]