岩溶地区坡面红壤抗冲性冲刷试验研究

发布时间：2018-05-20 22:02

本文选题：抗冲性 + 坡度　；参考：《科学技术与工程》2017年09期

【摘要】：为了研究岩溶地区不同影响因子对坡面红壤抗侵蚀性的影响,通过室内模型冲刷试验,考虑坡度,冲刷流量及干密度三个影响因素,对坡面表层红壤抗径流机械冲刷能力进行研究,分析不同条件下坡面表层红壤结构的抗冲性能。结果表明:坡度和冲刷流量对岩溶地区坡面红壤冲蚀量存在非线性的叠加增长作用。坡度与岩溶地区坡面红壤冲蚀量近似呈指数关系增长。坡面为疏松结构时,冲刷流量与坡面红壤冲蚀量呈密切的幂函数相关;坡面为紧实结构时,冲刷流量则与坡面红壤冲蚀量近似呈线性关系增长。土壤干密度影响了整个坡面冲蚀过程,尤其是细沟的发生、发展。冲刷过程中疏松土坡面细沟发育明显,而紧实土坡面多为断续的月牙形冲刷坑。冲刷流量(径流量)为坡面表层红壤抗冲性主要影响因子。
[Abstract]:In order to study the influence of different factors on the erosion resistance of red soil on the slope in karst area, three factors, including slope, scour flow and dry density, were considered in the laboratory model scour test. The erosion resistance of red soil on slope surface was studied, and the scour resistance of red soil structure on slope surface was analyzed under different conditions. The results show that the slope and scour discharge have a nonlinear superposition effect on the erosion of red soil on the slope in karst area. The slope increases exponentially with the erosion of red soil in karst area. When the slope is a loose structure, the erosion flow rate is closely related to the erosion amount of the red soil on the slope surface, while the erosion flow rate increases linearly with the erosion amount of the red soil on the slope surface when the slope surface is a compact structure. Soil dry density affects the erosion process of slope, especially the occurrence and development of rill. In the course of erosion, the thin gullies on the loose soil slope are obviously developed, but the compacted soil slope surface is mostly a intermittent crescent scour pit. The scour flow (runoff) is the main factor affecting the erosion resistance of red soil on the slope surface.
【作者单位】：河海大学岩土力学与堤坝工程教育部重点实验室;江苏省岩土工程技术工程研究中心河海大学;国家林业局昆明勘察设计院水利所;
【基金】：教育部博士点基金(20100094110002) 国家自然科学基金(51009054)资助
【分类号】：S157.1

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