弃土场侵蚀产沙模拟试验研究

鉴于目前很多学者对弃土场的研究,主要集中在室外天然降雨和人工模拟降雨监测上,而在室外由于受到工程建设时限和其他因素制约,并不能对各影响因素做定性研究的实际,利用室内模拟降雨对弃土场侵蚀产沙过程进行模拟试验研究,寻求侵蚀产沙规律及主要影响因素。试验结果为:弃土坡面侵蚀沟出现时间随降雨强度的增加而缩短;产沙量随降雨强度的增加而增加,但在雨强较小情况下,坡面产沙量最初随降雨的持续而逐渐增加,达到一个峰值后,便开始减少,并趋于稳定,而在大雨强条件下,坡面产沙量随降雨的持续呈波动增加状态,侵蚀量增加较快;在同一降雨强度条件下,坡面产沙量随坡度的增加而增加。

Simulation Experiment of Erosion and Sediment Yield of Spoil Ground

In view of some researches on spoil ground at present,mainly concentrating on monitoring of outdoor natural rainfall and artificial simulated rainfall.Because of restricted by the time limit of construction and other factors of outside,it is unable to conduct qualitative study on each affecting factor.The paper simulates the process of erosion and sediment yield by using indoor simulated rainfall for seeking the laws of erosion and sediment yield and main affecting factors.The outcomes show that a)the appearing time of erosion gully on slope of spoil ground is shortens along with the increase of rainfall intensity;b)sediment yield increases along with the increase of rainfall intensity.It increases gradually along with the continuance of precipitation at the beginning and starts to decrease and becomes stable after reaching to a peak value when rainfall intensity is smaller.The sediment yield on slope increases in a wave-shape and the erosion amount increases faster along with the continuance of precipitation under the conditions of great rainfall intensity;c)the sediment yield increases along with the increase of slope under the conditions of same rainfall intensity.