摘要
植物根系对土体的力学效应是提高边坡抗冲刷性能的重要因素,为了解植物根系在成片水流下的抗冲性能,以常见的水土保持植物高羊茅和狗牙根为例,对植物模型边坡进行射流冲刷试验,对比探讨了不同种类植物根系边坡的冲刷破坏机理。结果表明,各工况下高羊茅边坡、狗牙根边坡及素土边坡的平均侵蚀深度ΔDAE的变化规律具有相似性和一致性,随冲刷流速增加均呈指数函数增加,随冲刷角度增加均呈线性函数增加;各工况下平均侵蚀深度大小普遍为高羊茅<狗牙根<素土;各流速下高羊茅的平均侵蚀深度降低值ΔDAE略大于狗牙根;当冲刷角度一定时,两种植物边坡均在流速为1.6 m/s时各角度的ΔDAE最大,流速高于1.6 m/s后逐渐降低;当冲刷流速一定时,随冲刷角度的增加,ΔDAE有减小趋势。
The mechanical effect of plant roots on soil is an important factor in improving the erosion resistance of slopes,and the relevant research on the impact resistance of plant roots under water flow at home and abroad is in a blank spot.In this paper,the common soil and water conservation plants tall fescue and dogtooth roots were selected as the re-search objects,and the jet erosion test was carried out on the slope of the plant model,and the erosion failure mechanism of the root slope of different species of plants was compared.The main conclusions are as follows:the variation law of the average erosion depthΔD AE of high fescue slope,dogtooth root slope and plain soil slope under different working condi-tions is similar and consistent,and it increases exponentially as a function with the increase of erosion flow velocity and linear function with the increase of erosion angle.The average erosion depth under various working conditions was gener-ally as follows:high fescue<dog tooth root<plain soil;The average erosion depth of high fescue at each flow rate de-creased slightlyΔD AE slightly greater than that of dog tooth root.When the scouring angle was fixed,theΔD AE of each angle was the largest when the flow rate was 1.6 m/s,and the flow rate was higher than 1.6 m/s,and gradually de-creased.When the erosion flow rate is constant,there is a decreasing tendencyΔD AE increase with the increase of the scouring angle.
作者
张世安
刘明潇
甄映红
刘科
ZHANG Shi-an;LIU Ming-xiao;ZHEN Ying-hong;LIU Ke(Yellow River Institute of Hydraulic Research,Yellow River Conservancy Commission,Zhengzhou 450003,China;School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;School of Architectural Engineering,Kaili University,Kaili 556011,China;River and Reservoir Work Center of Shaanxi Province,Xi’an 710018,China)
出处
《水电能源科学》
北大核心
2023年第6期110-113,201,共5页
Water Resources and Power
基金
国家自然科学基金重点基金项目(41930643)
贵州省省州科技合作协议项目(黔科合[2017]7180号)
中央级公益性科研院所基本科研业务费资助项目(HKY-JBYW-2021-06)
水利技术示范项目(SF-202204)。
关键词
植物护坡
模型试验
水流冲刷
抗冲性能
plant slope protection
model test
water erosion
anti-scour performance
