粘性泥石流稳定运动的力学分析  

DYNAMIC ANALYSIS OF STABLE MOVEMENT IN VISCOUS DEBRIS FLOW

作　　者：康志成[1] 

机构地区：[1]中国科学院东川泥石流观测研究站

出　　处：《山地研究》1995年第2期128-132,共5页

摘　　要：重点论讨的是，泥石流形成之后的流通段粘性泥石流稳定运动特征。以野外观察为基础，提出了沙石体整体滑动的运动模式和膨胀流体的运动模式，并对这两种稳定运动模式提出了各自的计算方法及其参数的选用意见。The characteristics of stable movement in viscous debris flow after occurrence along transportation sector are emphatially discussed. First , It is analyzed that the saturated sand and stone body may change from solid to fluid properties,which is called fluidization, with changes of the longitudinal slope of river bed , flowing velocity of sand and stone body,and distance.The flowing velocity of sand and stone body flowing into transpodetion sector may beanalyzed from following 2 aspects :1.Regarded as an integrative sliding. Because movingfricitional angle φ_m of sand and stone body in transportation sector is nearly equal to longitudinalslope θ of river bed, the movement of debris flow can keep comparatively stable speed. It'Sealculation may be refered to formula(1,3).2. Regarded as expansion fluid. Generallyspeaking, when debris flow enters to transportation sector , it moves rather quickly with shearstress movement between sand and stone bodys, as well as produces collision between particles. Shear stress T and disperse force P produced by the collision and friction are important to themovement of debris flow.Consequently, when mass movement mainly as moving frictional angle of sand and stonebody changes to particle shearing flow mainly as dynamic frictional angle produced by shear andcollision between the coarse grains of debris flow,their flowing velocity may be calculatedaccording to formula(14).

关 键 词：粘性泥石流 稳定运动 沙石体 力学分析 泥石流 

分 类 号：P642.23[天文地球—工程地质学]