工程地质学报2026，Vol.34Issue(3)：912-922,11.DOI:10.13544/j.cnki.jeg.2025-0088
生物炭与剑麻纤维协同抑制膨胀土干缩开裂的试验研究
EXPERIMENTAL STUDY ON SYNERGISTIC INHIBITION OF DESICCA-TION CRACKING IN EXPANSIVE SOIL USING BIOCHAR AND SISAL FIBER
摘要
Abstract
Desiccation cracking in expansive soils often triggers geotechnical hazards.This study demonstrates that the incorporation of biochar and sisal fibers can effectively inhibit crack development.Through desiccation cracking tests,scanning electron microscopy(SEM),and digital image processing performed on compacted expansive soil from Nanning,the individual and combined effects of biochar and sisal fibers on crack resistance were systematically evaluated.The results show that untreated soil exhibited typical cracking patterns with interconnected primary cracks and secondary branching,while modified soil developed only primary cracks without secondary propagation.Moisture loss in modified soil followed an exponential decay model,where increased biochar content reduced the decay rate coefficient b,whereas higher fiber content and longer fiber length accelerated evaporation.Compared to untreated soil,the crack ratio decreased by 86.8％with 10％biochar and by 72.5％with 0.6％sisal fiber(by dry soil mass),respectively.In composite modifications,biochar content primarily governed crack length,while fiber content controlled crack ratio and width.Notably,a mixture of 10％biochar and 0.45％sisal fiber(20 mm length)completely suppressed surface cracking.Microstructural analysis revealed that biochar particles mechanically interlocked with soil through their rough surfaces and stored free water within internal pores,while randomly distributed sisal fibers formed a three-dimensional reinforcement network.Their synergistic interaction effectively restrained crack initiation and propagation.关键词
膨胀土/干缩开裂/生物炭/剑麻纤维/抗裂机制Key words
Expansive soil/Shrinkage cracking/Biochar/Sisal fiber/Crack resistance mechanism分类
建筑与水利引用本文复制引用
张东波,陈爱军..生物炭与剑麻纤维协同抑制膨胀土干缩开裂的试验研究[J].工程地质学报,2026,34(3):912-922,11.基金项目
国家自然科学基金项目(资助号:42467020),南宁市重点研发计划项目(资助号:20243041).This research is supported by the National Natural Science Foundation of China(Grant No.42467020)and Nanning Key Research and Development Program(Grant No.20243041). （资助号:42467020）
