颜荣涛,刘思豪,纪静茹,等.生物炭对百色膨胀土膨胀力的影响研究[J].河南理工大学学报(自然科学版)，doi:10.16186/j.cnki.1673-9787.2024120033.

YAN R T, LIU S H, JI J U, et al.Study on the effect of biochar on the swelling force of Baise expansive soil [J]. Journal of Henan Polytechnic University( Natural Science) ， doi: 10.16186/j.cnki.1673-9787.2024120033.

生物炭对百色膨胀土膨胀力的影响研究(网络首发)

颜荣涛，刘思豪，纪静茹，林灿灿，林德有，王国燕，于海浩

桂林理工大学 广西岩土力学与工程重点实验室，广西 桂林 541004

摘要: 目的 为研究生物炭作为添加剂掺入膨胀土会对膨胀土的膨胀特性产生的影响。方法 生物炭具有离子交换能力强、比表面积大、低密度、高孔隙率和高稳定性等特点，通过将生物炭（0%，1%，3%，5%）掺入膨胀土之中,并采用恒体积法，研究不同初始含水率、干密度条件下下，生物炭掺量对百色膨胀土膨胀时程曲线以及最大膨胀力的影响规律。结果 试验结果表明：添加生物炭会显著改变膨胀土的膨胀特性，随着生物炭掺量的增加，改性膨胀土的最大膨胀力增加，当掺量为5%时，膨胀力增幅可达130%。此外，不同干密度和初始含水率条件下，最大膨胀力的增幅效果存在差异；掺入生物炭的膨胀土，其膨胀时程曲线与未掺入的膨胀土在整体趋势上相近，但是随着生物炭掺量的增加，膨胀土加速膨胀阶段的持续时间延长，试样达到后期最大膨胀力和缓慢膨胀阶段的时间更晚。随着干密度的增加，改性膨胀土的膨胀力极值随之增加；初始含水率对改性膨胀土的最大膨胀力的影响并不表现出单一的线性关系。结论 生物炭对百色膨胀土膨胀特性的影响具有重要的科学意义和工程价值。

关键词: 生物炭；恒体积法；膨胀土；改性；膨胀时程曲线

doi: 10.16186/j.cnki.1673-9787. 2024120033.

基金项目:国家自然科学基金资助项目(52468048)

收稿日期：2024-12-15

修回日期：2025-04-21

网络首发日期：2026-07-17

Study on the effect of biochar on the swelling force of Baise expansive soil (Online)

Yan Rongtao, Liu Sihao , Ji Jingru, Lin Cancan, Lin Deyou，Wang Guoyan，Yu Haihao

Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin University of Technology,Guilin 541004 ,Guangxi,China

Abstract: Objectives To investigate the effect of incorporating biochar as an additive on the swelling characteristics of expansive soil. Methods Biochar is characterized by strong ion exchange capacity, large specific surface area, low density, high porosity, and excellent stability. By incorporating biochar (0%, 1%, 3%, 5%) into expansive soil and using the constant volume method, this study examined the influence of different biochar contents under varying initial water content and dry density conditions on the temporal variations curves of swelling pressure and the maximum swelling pressure of Baise expansive soil. Results The experimental results showed that the addition of biochar significantly altered the swelling characteristics of expansive soil. With an increase in biochar content, the maximum swelling pressure of the modified expansive soil increased, reaching a maximum increase of 130% at 5% biochar content. Furthermore, the magnitude of the increase varied across different dry density and initial water content conditions. The temporal variations curves of swelling pressure of expansive soil with biochar were similar in overall trend to those without biochar; however, as the biochar content increased, the duration of the accelerated swelling phase was prolonged, and the samples reached the maximum swelling pressure and slow swelling stage later. Additionally, with higher dry density, the maximum swelling pressure of the modified expansive soil also increased. However, the effect of initial water content on the maximum swelling pressure did not exhibit a simple linear relationship. Conclusions The influence of biochar on the swelling characteristics of Baise expansive soil has significant scientific and engineering value.

Key words: biochar; constant volume method; expansive soil; modification; temporal variations curves of swelling pressure