摘要
在坡度为20°,25°,30°,35°,设计流量为2.0,2.5,3.0,3.5 L/min的情况下,在室内对煤矸石颗粒进行模拟冲刷试验,研究了煤矸石坡面颗粒运移特征。结果表明:(1)在较小坡度和流量下,煤矸石颗粒运移具有明显的脉动性、随机性和间歇性,其体积含沙量变化幅度较大,煤矸石颗粒运移过程可分为蠕变阶段、波动运移阶段和稳定运移阶段。在较大坡度和流量下,颗粒运移呈现明显的突发性,在冲刷初期含沙量便达到最大值,随着时间的延续,含沙量逐渐降低,最后趋于稳定。颗粒运移过程可分为大规模集中运移阶段、深层切割运移阶段和稳定运移阶段。(2)集中股流对煤矸石堆置体具有很强的冲刷作用,会造成严重的侵蚀,侵蚀量与设计流量和坡度呈正相关关系,与冲刷时间呈幂函数负相关。
On the basis of simulated runoff scouring experiment, the paper deals with the particle movement of the loose mine waste with slope gradient of 20°,25°,30°,35° and discharge of 2 L/min,2.5 L/min,3 L/min,3.5 L/min. The results showed that：with the smaller gradient and discharge, the particle movement is characteristic of undulation, randomicity and intermittence, and with large fluctuation of the silt content. The particle movement process can be classified as creep movement,undulation movement and stable movement. With the bigger gradient and discharge, the particle movement is paroxysmal：at initial stage of the experiment, the silt content suddenly reached the biggest point, with the experiment continuing,the silt content gradually deceased and got to a constant finally. The particle movement process can be classified as large scale concentrating movement, cutting downward movement and stable movement. （2） Concentrated overland flow can cause serious erosion, the discharge and slope gradient is a big function of the amount of erosion volume with linear and power relationship.
出处
《水土保持研究》
CSCD
北大核心
2008年第6期68-71,共4页
Research of Soil and Water Conservation
基金
山西农业大学科技创新基金(200213)
山西省高等院校青年教师科研专项基金
关键词
模拟冲刷试验
煤矸石颗粒
运移特征
阵发性
突发性
simulated scouring experiment
coal mine waste particles
characteristics of particle movement
undulation
paroxysmal
