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    近自然护岸措施对提高河岸平衡坡度的作用——以重庆市长寿区桃花溪河岸为例

    Effects of the control measures closing to nature on slope gradient of relative balance for river bank: A case study of the Taohua River in Changshou District, Chongqing City

    • 摘要: 为研究近自然护岸措施对河道岸坡稳定性的影响,以重庆市桃花溪河岸为例,通过布设自然原型护岸措施、天然材料织物垫护岸措施、土工织物扁袋护岸措施3种近自然护岸措施,并以裸地为对照,采用针对水力侵蚀的泥沙起动模型和针对重力侵蚀的土壤抗剪强度模型研究近自然护岸措施下的平衡坡度。结果表明:1)经过2年自然修复,由泥沙起动模型结合土壤抗冲试验得出3种护岸措施和对照河岸的岸坡相对平衡坡度依次为>34.9°、>33.3°、>32.3°、>25.5°,且护岸措施配合织物材料有利于措施布设前期岸坡抵抗水土流失;2)由土壤抗剪强度模型得出3种护岸措施和对照的岸坡相对平衡坡度依次为35.0°、26.2°、30.3°、19.9°;3)3种护岸措施下抵抗水力侵蚀的岸坡相对平衡坡度均大于抵抗重力侵蚀的岸坡相对平衡坡度,故抵抗重力侵蚀的土壤抗剪强度模型更适合模拟当地近自然护岸措施下岸坡相对平衡坡度,3种近自然护岸措施下岸坡相对平衡坡度比对照分别提高15.1°、6.3°、10.4°。

       

      Abstract: According to the site conditions of Taohua River, Chongqing City, taken bare bank as control, three control measures closing to nature, including natural prototype revetment, revetment mat fabric of natural materials and flat bag geotextile revetment, were selected to protect river bank. After two years of natural restoration, the effects of three measures on the stability of river bank were analyzed from: the equation of sediment moving, and soil shear-resistance strength. Results show that 1) the gradient of relative balance derived from the sediment moving equation was given as follows: natural prototype revetment (>34.9°), revetment mat fabric of natural materials (>33.3°), flat bag geotextile revetment (>32.3°), and bare bank (>25.5°). 2) The gradient of relative balance derived from soil shear-resistance strength was natural prototype revetment (35.0°), revetment mat fabric of natural materials (26.2°), flat bag geotextile revetment (30.3°), bare bank (19.9°). 3) The slope gradient of relative balance derived from the equation of sediment moving were greater than that from the soil shear-resistance equation, therefore, it can be concluded that the gravity erosion occurred more possible than water erosion. Based on the values from soil shear-resistance equation in this paper, it can be concluded that compared with bare bank, the slope gradient of relative balance could be improved by 10.4°, 6.3°, 15.1° respectively by natural prototype revetment, revetment mat fabric of natural materials and flat bag geotextile revetment.

       

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