摘要
以运动学理论为基础对矿石在溜井中的运动规律进行理论推导,结合相似材料模拟试验对结果进行对比分析。研究结果表明,(1)初始冲击时法向冲击力较大,随着冲击次数的增加法向冲击力逐渐减弱切向冲击力逐渐增强,对井壁造成的破坏由以法向破坏为主转变为剪切破坏为主;(2)冲击点的间隔越来越大,冲击角度逐渐减小,矿石经过2～3次冲击井壁之后垂直落入井中;(3)理论推导得到形成的2个冲击带位于井口下2.0～5.6m及26.4～38.2m处,试验得出的破坏范围为井口下1.95～10.2m及19.4～40.2m处,试验所得的冲击带范围较理论推导结果略大;(4)处于冲击区域的压力盒数据变化最大,处于矿石磨损区域的压力盒数值变化较小且变化趋势缓和。
To analyze the stability of ore chute,the regular pattern of the ore movement in the ore chute and the deformation law of ore chute should be researched.This article is based on the kinematics theory to discuss the regular pattern of the ore movement in the ore chute and a similar material simulation is made to test its results.The study shows that in the beginning the normal impact is larger than others and with the increase of shock times,the normal impact becomes weaker and the tangential impact grows.The main damage to the shaft changes from normal breakage to tangential breakage.The interval between two impact spots is getting bigger;and bigger and the angle of impact reduces gradually.After two or three times struck,ores fall into chute vertically.Through the theoretical derivation calculation,there would be two impact zones under the well head： one is from 2.0-5.6 m and the other is from 26.4-40.2 m.The impact range obtained from the experiment is from 1.95-10.2 m and 19.4-40.2 m;and that is a bit larger than the result from the calculation.The data of the pressure box changes difference： the max change from the impact areas,less change from the ore attrition areas.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2011年第2期326-332,340,共8页
Rock and Soil Mechanics
基金
科技部国家"十一五"科技支撑重大计划项目(No.2006BAB02A02)
关键词
冲击载荷
理论推导
冲击带
相似模型试验
impact load
theoretical derivation
impact zone
similar model test
