摘要
公路压实高原二区黄土(Q2)路基坡面人工降雨侵蚀试验研究表明,坡面冲蚀强度与雨强、降雨历时、坡长、坡角、压实度、土壤粘性皆有一定关系,高原二区粘性黄土冲蚀强度随时间增加而减小过程对坡面防蚀有利,在得出历时1h降雨坡面平均冲蚀强度及长历时坡面侵蚀强度随时间变化的经验公式基础上,提出减小坡面冲蚀强度方法。首先考虑增加压实度减小坡面土体重力侵蚀来减少坡面总体侵蚀量;实际工程中采用修筑截水平台或截水沟减小降雨侵蚀坡长或坡高,可大大减小冲蚀强度;坡高h不变时,坡角避开冲蚀强度最大的临界坡度为25.9°;坡高一定及边坡稳定情况下,边坡坡角应尽量避开15°～60°范围,大于70°或小于15°的坡面冲刷很小,对于70°以上坡角特别适应于直立性黄土坡面。
The test with 1 h rainfall lasting was carried out. The results show that the plateau second area stickiness loess erosion intensity increases with time going that is advantageous for slope to prevent the rainfall erosion, and slope rainfall erosive intensity is closely connected with rain intensity, rain time, slope length, slope angle, compressed effect, and soil stickiness. The weaken erosive intensity methods are put forward as below: increasing the compressed soil intensity to control the soil weight corrode to reach the target of the total corrode number being cut off quickly;building intercept and capture step or drainage groove to decrease the great erosive intensity due to the great slope length or height;with the constant height,avoiding the maximum erosive intensity critical angle 25.9°. Under the stable and constant height condition,the designing slope beyond 15°～60° is the less erosive intensity angle. When the angle is bigger than 70°, it is greatly fit the perpendicular loess engineering slope.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2004年第6期11-14,共4页
Journal of Chang’an University(Natural Science Edition)
关键词
道路工程
路基
黄土
降雨
侵蚀
road engineering
subgrade
loess
rainfall
corrode
