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J. Hefei Univ. Tech. (Nat. Sci.)

合肥工业大学学报(自然科学版)

JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY (NATURAL SCIENCE)

Competent Authorities: Ministry of Education of the People's Republic of China

Sponsor by: Hefei University of Technology

ISSN 1000-1646, CN 34-1001/N

Triaxial shear test of basalt fiber reinforced expansive soil

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玄武岩纤维加筋膨胀土三轴剪切试验研究

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Dec.2025, Vol.48 No.12: 1697-1704

DOI: 10.3969/j.issn.1003-5060.2025.12.017

Authors

WANG Pengcheng, XIA Wenli, GUO Jinsong, LIU Ming, WANG Xuyang

(School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: The reinforcement effect and physical and mechanical properties of basalt fiber reinforced expansive soil were tested. The fiber reinforced soil samples with the same water content and dry density were prepared with 6 mm basalt fibers at mass fractions of 0, 0.25%, 0.50%, 0.75% and 1.00%, and the triaxial consolidated undrained tests were carried out under different confining pressures. The microstructure of the representative soil mass under 300 kPa confining pressure was observed by scanning electron microscope (SEM). The results show that the basalt fiber reinforced modified expansive soil exhibits a distinct plastic failure with middle swelling. The cohesion of reinforced soil firstly increases and then decreases with the increase of fiber mass fraction, and the cohesion reaches the maximum when the fiber mass fraction is 0.50%. Compared to cohesion, the fiber mass fraction has little effect on the internal friction angle. The stress-strain of fiber reinforced soil generally shows a hardening type, which can be fitted by hyperbolic curve. With the increase of fiber content, the distribution mode of fibers in soil samples changes from simple handhold to three-dimensional spatial network of fibers, which restricts the development of microscopic cracks in the samples.

Keywords: reinforced expansive soil; microstructure; basalt fiber; triaxial shear test

作者信息

汪鹏程，夏文丽，郭劲松，刘明，王旭洋

（合肥工业大学土木与水利工程学院，安徽合肥230009）

摘要和关键词

摘要: 针对玄武岩纤维加筋重塑膨胀土加筋效果及其物理力学性能,文章开展相关试验研究。将长度为6 mm的玄武岩纤维按照质量分数分别为0、0.25%、0.50%、0.75%、1.00%配制相同含水率和干密度纤维加筋土试样,进行不同围压下三轴固结不排水试验,对围压300 kPa下试样中代表性土体使用扫描电子显微镜(scanning electron microscope, SEM)进行微观结构观察。结果表明:玄武岩纤维加筋改良膨胀土为明显的中间鼓胀的塑性破坏;加筋土黏聚力随纤维质量分数增加先增大后减小,当纤维质量分数为0.50%时,黏聚力最大;相较于黏聚力,纤维质量分数对内摩擦角的影响不大;纤维加筋土应力-应变总体表现为硬化型,可以用双曲线来拟合;随纤维掺量的增加,纤维在土样中分布方式由简单握裹作用变为纤维三维空间网作用,限制了试样内部微观裂隙的发展。

关键词: 加筋膨胀土；微观结构；玄武岩纤维；三轴剪切试验

Funding

国家自然科学基金联合基金资助项目（U1965101）

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