流动散体中波的传播规律与振动分形特征  

CHARACTERISTICS OF WAVE PROPAGATION AND VIBRATION FRACTAL IN FLOWING GRANULAR MEDIA

作　　者：周健[1] 孙业志[1] 吴爱祥[2] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]中南大学资源与安全工程学院,湖南长沙410083

出　　处：《岩石力学与工程学报》2005年第5期835-839,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：教育部博士点专项基金项目(20020533037)

摘　　要：试验测定振动助流时散体颗粒在初始阶段和稳定流动阶段的振动加速度信号,并对流动场中波的传播规律进行分析。把流动中的散体看作弱横观各向同性介质,给出了P波、SH波和SV波的速度表达式,分析了它们在流动散体介质中的传播特点。认为椭球体的偏心率减小,散体间的黏性阻力和内摩擦力降低,松散系数增加,使散体具有更好的流动性。散体颗粒受振运动是一种不规则、复杂和随机的运动,具有分形特征,对其进行了分形分析和模拟。The vibration acceleration signals at initial stage and steady stage in flowing granular media are tested, and the propagation of wave in the flowing field is analyzed. The flowing granular media are taken as weak transverse isotropic media, and the phase velocity expressions of P wave, SH wave and SV wave are deduced accordingly. Their propagation characteristics in flowing granular media are analyzed. Compared to normal ore drawing, the eccentricity of ellipsoid, the viscosity resistance and inner friction among granules and shear intensity of granules are decreased, and the loosening coefficient of granules is increased in vibration ore drawing, so the granules have better fluidity. The motions of granules by vibration are irregular, complicated and stochastic, so it has fractal characteristics, which is analyzed and simulated.

关 键 词：采矿工程 流动散体 波 振动 分形 

分 类 号：TU435[建筑科学—岩土工程] TD521.3[建筑科学—土工工程]