Abstract
Fiber reinforcement technology can significantly improve the mechanical properties of soil and has been increasingly applied in geotechnical engineering. Basalt fiber is a new kind of environment-friendly and high-performance soil reinforcement material, and the mechanical properties of basalt fiber-reinforced soil have become a hot research topic. In this paper, we conducted monotonic triaxial and cyclic triaxial tests, and analyzed the influence of the fiber content, moisture content, and confining pressure on the shear characteristics, dynamic modulus, and damping ratio of basalt fiber-reinforced silty clay. The results illustrate that basalt fiber can enhance the shear strength of silty clay by increasing its cohesion. We find that the shear strength of reinforced silty clay reaches its maximum when the fiber content is approximately 0.2% and the moisture content is 18.5% (optimum moisture content). Similarly, we also find that the dynamic modulus that corresponds to the same strain first increases then decreases with increasing fiber content and moisture content and reaches its maximum when the fiber content is approximately 0.2% and the moisture content is 18.5%. The dynamic modulus is positively correlated with the confining pressure. However, the change in the damping ratio with fiber content, moisture content, and confining pressure is opposite to that of the dynamic modulus. It can be concluded that the optimum content of basalt fiber for use in silty clay is 0.2%. After our experiments, we used scanning electron microscope (SEM) to observe the microstructure of specimens with different fiber contents, and our results show that the gripping effect and binding effect are the main mechanisms of fiber reinforcement.
摘要
纤维加筋技术可以显著改善土体的力学性能,在岩土工程领域得到广泛的应用。玄武岩纤维作为一种新型环保的加筋材料,其与土体的力学性能得到越来越多的关注。本文通过三轴压缩试验以及动三轴试验研究了纤维含量、含水率以及围压等因素对玄武岩纤维加筋粉质黏土剪切特性、动弹性模量以及阻尼比的影响。试验结果表明:玄武岩纤维可以通过提高黏聚力来提高粉质黏土的剪切强度,当纤维含量为0.2%、含水率为18.5%(最优含水率)时,纤维加筋粉质黏土的剪切强度最大。随着纤维含量以及含水率的增加,相同动应变对应的动弹性模量呈现先增大后减小的变化趋势,当土体的纤维含量为0.2%、含水率为18.5%时,其动弹性模量最大;动弹性模量与围压呈现正相关关系。土体阻尼比随着纤维含量以及含水率的增加先减小后增大,随着围压的增加而减小。综合分析表明,本文所采用的玄武岩纤维最优含量在0.2%左右。纤维加筋粉质黏土的扫描电镜(SEM)结果表明:单根纤维与土体间的握裹作用以及纤维网间的约束作用是加筋土强度增强的主要机理。
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Project(51978674) supported by the National Natural Science Foundation of China; Project(2017G008-A) supported by the China Railway Corporation Science and the Technology Development Project
Contributors
The overarching research goals were developed by ZHANG Jia-sheng, WANG Xuan, CHEN Xiao-bin, and LIU Tao. JIA Yu and DING Yu carried out the experiments and analyzed the data. CHEN Xiao-bin acquired the funding. The initial draft of the manuscript was written by JIA Yu, DING Yu, and WANG Xuan. All authors replied to reviewers’ comments and revised the final version.
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JIA Yu, ZHANG Jia-sheng, WANG Xuan, DING Yu, CHEN Xiao-bin, and LIU Tao declare that they have no conflict of interest.
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Jia, Y., Zhang, Js., Wang, X. et al. Experimental study on mechanical properties of basalt fiber-reinforced silty clay. J. Cent. South Univ. 29, 1945–1956 (2022). https://doi.org/10.1007/s11771-022-5056-z
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DOI: https://doi.org/10.1007/s11771-022-5056-z