Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
Environ Sci Pollut Res Int. 2022 Jul;29(32):49422-49428. doi: 10.1007/s11356-022-20707-y. Epub 2022 May 12.
Biochar has a great potential to sustainably improve the performance of bio-engineered slope due to its ability to retain water and to supply nutrients. Existing studies mainly focus on hydrological properties of biochar-amended soil. However, the effects of biochar on shear strength of soil are not well studied. This study aims to assess the shearing behaviour of biochar-amended completely decomposed granite (CDG). Soil specimens were prepared by mixing CDG with two types of biochar at a mass ratio of 5% and compacted at 95% of the maximum dry density. Although the peak shear strength of biochar-amended CDG is reduced by up to 20% because of lower initial dry density of the soil and crushing of biochar particles during shearing, both types of biochar have negligible effects on the ultimate shear strength, which is governed by friction between soil particles. This highlights that the ultimate friction angle can be adopted for designing bio-engineered slopes using biochar-amended soils.
生物炭具有保持水分和提供养分的能力，有望可持续地提高生物工程边坡的性能。现有研究主要集中在生物炭改良土壤的水文性质上。然而，生物炭对土壤抗剪强度的影响还没有得到很好的研究。本研究旨在评估生物炭改良完全分解花岗岩（CDG）的剪切行为。通过将 CDG 与两种生物炭以质量比 5%混合，并在最大干密度的 95%下压实来制备土壤样本。尽管由于土壤初始干密度较低和剪切过程中生物炭颗粒的破碎，生物炭改良 CDG 的峰值抗剪强度降低了高达 20%，但这两种生物炭对抗剪强度的影响可以忽略不计，而抗剪强度主要由颗粒之间的摩擦力控制。这表明，在使用生物炭改良土壤的生物工程边坡设计中，可以采用最终摩擦角。
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