人民长江2026，Vol.57Issue(7)：190-198,9.DOI:10.16232/j.cnki.1001-4179.2026.07.024
生物炭对三峡库区紫色土力学性能的影响
Effect of biochar on mechanical properties of purple soil in Three Gorges Reservoir area
摘要
Abstract
To investigate the effects of biochar particle size and mixing ratio on the mechanical properties of purple soil in the Three Gorges Reservoir area,we used purple soil from the area as the research object.Biochar dosages were set at 2%,4%,and 8%,with particle sizes of<0.25 mm,0.25～0.5 mm,0.5～1.0 mm,and 1.0～2.0 mm;a control check(CK)group without biochar addition was also established.Direct shear tests and unconfined compressive strength tests were conducted to analyze the stress-strain curves,cohesion,internal friction angle,and unconfined compressive strength of specimens under different dosages and particle sizes,in order to clarify the effects of biochar particle size and dosage on the mechanical properties of purple soil.The results showed that:① The reinforcement effect of medium-sized biochar(0.25～1.0 mm)was significantly stronger than that of fine-sized(<0.25 mm)and coarse-sized(1.0～2.0 mm)biochar;② Biochar dosages of 2%and 4%significantly im-proved the mechanical properties of purple soil(P<0.05);③ However,the improvement weakened when the dosage reached 8%,especially for the particle size of 1.0～2.0 mm,where the unconfined compressive strength was even 22.95%lower than that of CK;④ The specimen exhibited the best mechanical properties at a biochar particle size of 0.25～0.5 mm and a dosage of 4%,with shear strength and compressive strength increasing by 47.96%～58.00%and 49.35%,respectively,compared with those of CK.Biochar incorporation affects cohesion and internal friction angle by modifying the arrangement and contact character-istics of soil particles,and also absorbs strain energy when subjected to stress,thereby retarding crack propagation.关键词
紫色土/土壤加固/力学性能/生物炭/资源化利用/多孔结构/三峡库区Key words
purple soil/soil stabilization/mechanical properties/biochar/resource utilization/porous structure/Three Gor-ges Reservoir area分类
建筑与水利引用本文复制引用
李辉,朱建康,张德谦,徐萌苒,朱敏,肖海..生物炭对三峡库区紫色土力学性能的影响[J].人民长江,2026,57(7):190-198,9.基金项目
国家自然科学基金项目(U21A2031) （U21A2031）
中国电建湖北工程创新基金项目(HBGC-KJ2-2024-12) （HBGC-KJ2-2024-12）
土木工程防灾减灾湖北省引智创新示范基地项目(2021EJD026) （2021EJD026）
