边坡植被固土抗冲刷特性及其护坡机理研究
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TU43

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江苏省地质矿产勘查局科研项目(2019KY13);国家自然科学基金面上项目(41877212)


Study on Erosion Resistance Property of Slope Vegetation Soil Consolidation and Slope Protection Mechanism
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    摘要:

    为了研究植物对土体蒸发速率和抗冲刷特性的影响及其变化规律,选择常用护坡植物黑麦草与紫花苜蓿两类植物进行蒸发试验和抗冲刷试验,分析了在不同植物种子配比条件下,试样在植物生长时期的蒸发速率,结合图像二值化方法得到植物生长14 d后的植被覆盖率,分析不同植物种子配比条件下土体抗冲刷特性。植物生长试样所用混合植物种子设置5种配比,黑麦草与紫花苜蓿的配比分别为1∶0、0.7∶0.3、0.5∶0.5、0.3∶0.7和0∶1,植物生长周期设置为14 d。试验结果表明:紫花苜蓿在植被生长发育前期对土体蒸发速率影响效果更为显著,在生长稳定期所有配比的试样蒸发速率趋于一致;利用图像二值化方法得出黑麦草与紫花苜蓿配比为3∶7时植被覆盖率最高,为80.1%;混合配比试样的植被覆盖率的提高,其发育的植物茎叶减少雨水对土体的冲击并减弱径流侵蚀,不同类型的根系与土体结合,增大根系影响深度并增强加筋作用,增强了土体抗冲刷性能。

    Abstract:

    In order to study the influence of plants on soil evaporation rate and erosion resistance characteristics and the changing rules, two types of plants commonly used for slope protection, ryegrass and alfalfa, were selected for evaporation test and erosion resistance test. The evaporation rate of samples during plant growth period was analyzed under different plant seed proportion conditions, and the vegetation coverage after 14 days of plant growth is obtained by combining image binarization method. The anti erosion characteristics of soil under different plant seed proportion were analyzed. The mixed plant seeds used in the plant growth sample were set with five ratios, the ratios of ryegrass and alfalfa were 1∶0, 0.7∶0.3, 0.5∶0.5, 0.3∶0.7 and 0∶1 respectively, and the plant growth cycle was set at 14 days. The results shows that alfalfa has a more significant effect on soil evaporation rate in the early stage of vegetation growth and development, and the evaporation rate of all proportions of samples tend to be consistent in the stable growth period; Using the method of image binarization, it is concluded that the highest vegetation coverage is 80.1% when the ratio of ryegrass to alfalfa is 3∶7; With the increase of the vegetation coverage of the mixed proportion sample, the developed plant stems and leaves reduce the impact of rainwater on the soil and weaken the runoff erosion. Different types of roots combine with the soil to increase the depth of root influence and enhance the reinforcement effect, and enhance the anti scouring performance of the soil.

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梅红,胡国长,王禄艺,梅绪哲,刘瑾,徐佳俊,杨欣雅,杨诺.边坡植被固土抗冲刷特性及其护坡机理研究[J].河北工程大学自然版,2022,(4):86-91

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  • 收稿日期:2022-05-12
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  • 在线发布日期: 2022-12-29
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