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Mechanism of improvement of biochar on shear strength and liquefaction resistance of sand

机译：生物炭地对沙子剪切强度和液化抗性的机制

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摘要

Biochar is a biomass-derived carbonaceous solid product produced by way of pyrolysis, a process whereby thermal degradation of biomass occurs in the absence of or under a limited oxygen environment. To date, little work has been done to assess its effect on soil properties from the geotechnical point of view. A few studies have shown that biochar could increase the shear strength of clays. Results of simple shear tests indicated that although the effect of adding biochar on the drained shear resistance of sand is relatively minor, the liquefaction resistance increased considerably. In this paper, to provide an insight into the mechanism, the interaction between biochar and water was studied in more detail, through an analysis of the biochar chemical active surface, morphological observations of the particles and biochar-water suspension, as well as rheological measurements. It is believed that the mechanism of improvement is related to the active chemicals on the surface and inside the pores of the biochar particles. These volatiles interact with water by repelling it (hydrophobic) and at times by attracting it (hydrophilic), creating a complex network between water and biochar particles that helps to delay the increase in excess pore-water pressure and provides some shear resistance.
机译：生物炭是一种通过热解产生的生物质衍生的碳质固体产物，其在有限的氧环境的情况下发生生物质的热降解的过程。迄今为止，已经完成了很少的作品来评估其对岩土性观点的土壤性质的影响。一些研究表明，生物炭可以增加粘土的剪切强度。简单剪切试验的结果表明，尽管添加生物炭对砂的排干剪切电阻的效果相对较小，但液化阻力显着增加。在本文中，为了提供对机构的洞察力，通过分析生物炭化学活性表面，颗粒和生物炭 - 水悬浮液的形态学观察以及流变测量，更详细地研究了生物炭和水之间的相互作用，以及流变测量。据信，改善机制与表面上的活性化学物质和生物淀粉的孔内有关。这些挥发物通过吸收它（疏水）和通过吸引它（亲水）而与水相互作用，在水和生物炭颗粒之间产生复杂的网络，有助于延迟过量孔隙水压力并提供一些抗剪切抗性。

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