The development of tensile stress can cause desiccation cracks, further increasing infiltration and inducing instability in green infrastructure (slopes and landfill liners). Recent research has promoted the use of biochar (i.e., stable carbon with a life period of more than 500 years) as an eco-friendly material that can provide simultaneous benefits in reducing tensile stresses and crack development, aiming to enhance landfill cover longevity. However, there is a lack of guidelines and criteria for selecting biochar (feedstock type and particle size) as landfill cover material. This study aims to investigate the effects of biochar particle size and feedstock type on cracking of soil. Two contrasting feedstock types (i.e., pig manure-based and wood-based) have been selected for amendment on lean clay soil. Laboratory experiments were conducted to monitor the cracks. The results show that wood biochar (WB) is more efficient in crack reduction than pig manure biochar (PMB). Moreover, it has been observed that fine-grained biochar is more suspectable to cracks formation regardless of biochar type. The cohesion and internal friction angle of biochar are dependent on the surface morphology of biochar. WB has more angularity and sharp edges, which can increase interlocking in soil, thereby enhancing shear resistance and, hence, soil stability. The comprehensive study can help narrow down the selectivity of biochar and its specifications to mitigate cracks and enhance the strength of landfill cover.

张应力的发展会导致干燥裂缝，进一步增加渗透并导致绿色基础设施（斜坡和垃圾填埋场衬里）的不稳定性。最近的研究促进了使用生物炭（即，使用寿命超过500年的稳定碳）作为一种生态友好型材料，可以同时降低拉伸应力和裂纹发展，从而提高垃圾填埋场的使用寿命。然而，缺乏选择生物炭（原料类型和粒度）作为垃圾掩埋覆盖材料的指导方针和标准。这项研究旨在调查生物炭颗粒大小和原料类型对土壤开裂的影响。已经选择了两种不同的原料类型（即猪粪和木料）在稀粘土上进行改良。进行实验室实验以监测裂纹。结果表明，木材生物炭（WB）在减少裂纹方面比猪粪生物炭（PMB）更有效。此外，已经观察到，无论生物炭的类型如何，更细粒度的生物炭更容易形成裂纹。生物炭的内聚力和内摩擦角取决于生物炭的表面形态。WB具有更大的倾斜度和锋利的边缘，可增加在土壤中的互锁性，从而增强抗剪切性，从而增强土壤稳定性。全面的研究可以帮助缩小生物炭的选择性及其规格，以减轻裂缝并提高垃圾掩埋场的强度。已经观察到，无论生物炭的类型如何，更细粒度的生物炭更容易形成裂纹。生物炭的内聚力和内摩擦角取决于生物炭的表面形态。WB具有更大的倾斜度和锋利的边缘，可增加在土壤中的互锁性，从而增强抗剪切性，从而增强土壤稳定性。全面的研究可以帮助缩小生物炭的选择性及其规格，以减轻裂缝并提高垃圾掩埋场的强度。已经观察到，无论生物炭的类型如何，细粒生物炭更容易形成裂纹。生物炭的内聚力和内摩擦角取决于生物炭的表面形态。WB具有更大的倾斜度和锋利的边缘，可增加在土壤中的互锁性，从而增强抗剪切性，从而增强土壤稳定性。全面的研究可以帮助缩小生物炭的选择性及其规格，以减轻裂缝并提高垃圾掩埋场的强度。土壤稳定性。全面的研究可以帮助缩小生物炭的选择性及其规格，以减轻裂缝并提高垃圾掩埋场的强度。土壤稳定性。全面的研究可以帮助缩小生物炭的选择性及其规格，以减轻裂缝并提高垃圾掩埋场的强度。