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鄂州航空港通渠河岸植物根系加固土体的机理
黄钢1,2, 郑明新1, 王庆2, 卢雪松2, 彭晶2
1.华东交通大学 土木建筑学院, 江西 南昌 330013;2.黄冈师范学院 建筑工程学院, 湖北 黄冈 438000
摘要:
[目的] 定量分析鄂州航空港通渠河岸草灌植物(狗牙根、香根草和紫橞槐)根系分布参数对土体的加固作用,为更好地评价植物根系固土效能提供理论依据。[方法] 通过根钻取样法探究草灌根系分布参数在不同深度的变化规律;开展室内直剪试验和室外张力计测试分别研究了根系分布参数变化对抗剪强度指标和基质吸力的影响。[结果] ①植物的根系分布总体上随着土体深度的增加而减少,灌木植物(紫橞槐)根系分布参数在深度为0-40 cm范围内是草本植物(香根草和狗牙根)的2.13~2.90倍。②灌木植物根-土复合体黏聚力明显大于草本植物,黏聚力与根长度密度(RLD)和根表面积密度(RSAD)满足多项式函数关系。③根系分布参数RLD和RSAD的黏聚力和基质吸力差异达到显著水平(p<0.05)。④灌木植物(紫橞槐) RLD和RSAD对土体基质吸力的增强作用存在最优含根密度。[结论] 狗牙根、白三叶和紫橞槐根系均能显著发挥固土作用。由于根系分布、固土深度、固土方式等差异,三者的固土作用不同,可将三者结合种植,不仅有利于河岸边坡的稳定,也可提高土体的抗冲性。
关键词:  通渠河岸  根-土复合体  黏聚力  基质吸力  根系分布参数
DOI:10.13961/j.cnki.stbctb.2021.01.003
分类号:TU411.3
基金项目:国家自然科学基金项目“干湿循环条件下煤系土强度特性及边坡致灾风险分析”(51568022);湖北省教育厅科技研究项目“鄂东大别山地区岩质边坡原生态恢复技术研究”(30002/203201920903);黄冈师范学院高级别培育项目(204202004303)
Mechanism of Soil Reinforcement by Vegetation Roots in Canal of Ezhou Airport
Huang Gang1,2, Zheng Mingxin1, Wang Qing2, Lu Xuesong2, Peng Jing2
1.Department of Civil Architecture College, East China Jiaotong University, Nanchang, Jiangxi 330013, China;2.Department of Civil and Architecture Engineering, Huanggang Normal University, Huanggang, Hubei 438000, China
Abstract:
[Objective] The root distribution parameters of grass-shrub vegetation (Cynodon dactylon, Vetiveria zizanioides, and Amorpha fruticosa) on soil reinforcement on the banks of the canal of Ezhou airport were analyzed quantitatively to provide a theoretical basis for better evaluation of the effectiveness of vegetation root soil.[Methods] The root-drill sampling method was used to explore the changes in grass-shrub root distribution parameters at different depths. Indoor direct shear tests and outdoor tensiometer tests were carried out to study the effect of root distribution parameters on shear strength indices and matrix suction.[Results] ① The root distribution of grass-shrub vegetation generally decreased with increasing soil depth. The root distribution parameters of shrubs (A. fruticosa) and herbs (C. dactylon and V. zizanioides) were 2.13-2.90 times in the depth range of 0-40 cm. ② The cohesion of the shrub root-soil composite was significantly higher than that of the herbs, and the cohesion satisfied a polynomial function relationship with root length density (RLD) and root surface area density (RSAD). ③ RLD and RSAD had significant differences in cohesion and matrix suction (p<0.05). ④ There was an optimal root density for the RLD and RSAD of shrubs (A. pseudoacacia) to enhance the suction of the soil matrix.[Conclusion] The root systems of C. dactylon, V. zizanioides, and A. fruticosa can play a significant role in soil fixing. Owing to their root distribution, soil fixing depth, soil fixing methods, the three plants have different soil-fixing functions. The three plants can be combined for planting, which is not only beneficial to the stability of riverbank slopes, but also improves the soil erosion resistance.
Key words:  riparian riverbank  root-soil composite  cohesion  matric suction  root distribution parameter