生物炭-植被协同防护膨胀土边坡的抗裂防渗特性研究
Cracking resistance and anti-seepage performance of expansive soil slopes under biochar-vegetation synergistic protection
摘要
Abstract
To enhance the cracking resistance and anti-seepage performance of expansive soil slope surfaces in wetting-drying cycles while maximizing the ecological benefits of vegetation,a novel synergistic protection method combining biochar and vegetation was proposed.Outdoor wetting-drying cycle tests were conducted on expansive soil slopes,with real-time monitoring of volumetric water content,vegetation growth parameters and crack morphological indicators.The influence of the biochar-vegetation synergistic effect on crack evolution and rainwater infiltration behavior were elucidated.The results indicate that the synergistic protection significantly strengthens the cracking resistance of expansive soil slopes.During wetting-drying cycles,extensive cracks develop on surfaces of bare expansive soil slope(S1)and the vegetation-only protected slope(S2),where adjacent primary and secondary cracks rapidly intersects to form complex networks.In contrast,crack development on biochar-vegetation protected slope(S3)is relatively slow,with the peak crack ratio reduced by 51.92%and 40.89%compared to S1 and S2,respectively.The synergistic mechanism primarily involves mitigating the swell-shrink potential,reducing the dehydration-induced tensile stress field,and enhancing the tensile strength of the soil.Consequently,the anti-seepage performance of the slope is significantly improved due to crack suppression.Under the influence of preferential flow through cracks,transient saturated zones are formed within S1 and S2,leading to a sharp decline in matric suction.Conversely,the volumetric water content and matric suction within S3 remain relatively stable.These findings provide a theoretical basis and practical reference for the ecological protection design of expansive soil slope surfaces.关键词
防灾减灾/膨胀土/生物炭/协同防护/裂隙演化/优先流Key words
disaster prevention and mitigation/expansive soil/biochar/synergistic protection/crack evolution/preferential flow分类
交通工程引用本文复制引用
欧阳淼,兰素恋,谢云鹏,张红日,覃永晖,李珍玉,林宇亮..生物炭-植被协同防护膨胀土边坡的抗裂防渗特性研究[J].中南大学学报（自然科学版）,2026,57(5):2281-2291,11.基金项目
国家自然科学基金资助项目(42330701,42477143) （42330701,42477143）
广西重大人才项目(2024) （2024）
广西重点研发计划项目(桂科AB23075184) （桂科AB23075184）
博士科研启动项目(25BSQD68) （25BSQD68）
崇左市特殊土与工程防灾减灾重点实验室2025年度开放课题项目(TST202503)(Projects(42330701,42477143)supported by the National Natural Science Foundation of China （TST202503）
Project(2024)supported by the Major Talent Project of Guangxi Zhuang Autonomous Region （2024）
Project(Guike AB23075184)supported by the Key Research and Development Program of Guangxi Zhuang Autonomous （Guike AB23075184）
Project(25BSQD68)supported by the Doctoral Scientific Research Startup Foundation （25BSQD68）
Project(TST202503)supported by the 2025 Open Project of Chongzuo Key Laboratory of Special Soil and Engineering Disaster Prevention and Mitigation) （TST202503）
