Innovation Demonstration Base of Ecological Environment Geotechnical and Ecological Restoration of Rivers and Lakes, Hubei University of Technology, Wuhan, People's Republic of China.
Environ Technol. 2023 Dec;44(28):4284-4295. doi: 10.1080/09593330.2022.2090861. Epub 2022 Jun 24.
The utilization of dredged sludge can reduce environmental pollution and save land resources. To explore using sludge resources in ecological slope-protection projects, dredged sludge was incorporated into ecological slope-protection soil. was planted to analyze the effect of sludge content on its growth. Direct-shear tests on the slope-protection soil with and without were conducted to elaborate on the effect of sludge content, water content, and roots on the mechanical properties of the sludge-clay mixture. When the sludge content was <50%, growth improved with the sludge content increase, but at >50%, the sludge content's effect was meagre. As the sludge content increased, the cohesion and internal friction angle of the sludge-clay mixture without roots decreased, lowering the shear strength. The soil's cohesive force and internal friction angle follows the sequence: natural state with roots > natural state without roots > saturated state with roots > saturated state without roots. The cohesion and shear strength of the sludge-clay mixture with roots increased at first before decreasing with an increase in sludge content, optimized at 50% sludge content. Here, the ecological slope stability was the best, meaning that the optimum sludge proportion was 50%.
利用疏浚淤泥可以减少环境污染和节约土地资源。为了探索在生态边坡防护工程中利用污泥资源，将疏浚淤泥掺入生态边坡防护土中。种植了以分析污泥含量对其生长的影响。对有无 的边坡防护土进行直剪试验，详细阐述了污泥含量、含水量和根系对污泥-粘土混合物力学性能的影响。当污泥含量<50%时，随着污泥含量的增加， 的生长得到改善，但>50%时，污泥含量的影响微不足道。随着污泥含量的增加，无根污泥-粘土混合物的内聚力和内摩擦角减小，剪切强度降低。土壤的粘聚力和内摩擦角依次为：有根自然状态>无根自然状态>有根饱和状态>无根饱和状态。有根污泥-粘土混合物的内聚力和抗剪强度先增加后减少，随着污泥含量的增加而减少，在污泥含量为 50%时达到最优。此时，生态边坡稳定性最佳，即最佳污泥比例为 50%。
