Experimental Study on Physical-Mechanical Properties of Expansive Soil Improved by Multiple Admixtures
Experimental Study on Physical-Mechanical Properties of Expansive Soil Improved by Multiple Admixtures
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多元掺合料改良膨胀土物理力学性能试验研究
DOI：
10.1155/2021/5567753
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发表时间：
2021-05
影响因子：
1.8
通讯作者：
Cao Rihong
中科院分区：
文献类型：
--
作者：
Ma Binhui;Cai Kai;Zeng Xing;Li Zhuo;Hu Zhiyong;Chen Qiunan;He Chengbin;Chen Bingchu;Huang Xiaocheng;Cao Rihong
膨胀土的处理一直是工程中的难题。利用煤矸石、粉煤灰等固体废弃物处理膨胀土已逐渐成为节能环保的新途径。现有研究大多集中于使用一种或两种外加剂改良膨胀土，而采用多种外加剂改良膨胀土的研究较少。本文对煤矸石、粉煤灰、石灰改性膨胀土的胀缩变形及强度特性进行了试验研究。通过正交试验设计了9组不同的配合比，并测试了不同配合比下改良膨胀土的物理力学性能。对试验结果进行敏感性分析，研究各外加剂在不同配合比下对改良膨胀土的影响，得出不同条件下的最佳配合比。最佳配合比为煤矸石8%、粉煤灰11%、石灰6%。进一步进行扫描电子显微镜（SEM）测试，分析改良膨胀土的微观结构，探讨复合外加剂的改良机理。结果表明，掺灰膨胀土的最佳含水率和最大干密度降低，膨胀土的液塑极限、自由膨胀率、抗剪强度、无侧限抗压强度等性能明显改善。通过综合平衡法分析发现，石灰含量对膨胀土的改良效果影响最大，其次是煤矸石，最小是粉煤灰。 SEM结构分析表明，改良膨胀土颗粒以团聚体为主，土体结构致密，颗粒团聚增多，整体结构更强。研究成果可为各种外加剂改良膨胀土以及煤矸石、粉煤灰等固体废弃物的资源化利用提供参考。
The treatment of expansive soil is always a difficult problem in engineering. Using coal gangue, fly ash, and other solid waste to treat expansive soil has gradually become a new way of energy saving and environmental protection. Most of the existing studies focus on using one or two kinds of admixtures to improve expansive soil, but there are few studies on improving expansive soil with multiple admixtures. In this paper, the expansion and shrinkage deformation and strength characteristics of expansive soil modified by coal gangue, fly ash, and lime are studied experimentally. Nine groups of different mixing schemes were designed through orthogonal tests, and the physical and mechanical properties of the improved expansive soil under different mixing ratios were tested. The sensitivity analysis of the test results was carried out to study the effect of each admixture on the improved expansive soil under different mixing ratios, and the optimal mix ratio under different conditions was obtained. The optimal mix ratio is 8% for coal gangue, 11% for fly ash, and 6% for lime. Further scanning electron microscopy (SEM) tests were carried out to analyze the microstructure of the improved expansive soil and explore the improvement mechanism of the multiadmixture. The results show that the optimal moisture content and the maximum dry density of the expansive soil with ash are decreased, and the properties of liquid plastic limit, free expansion rate, shear strength, and unconfined compressive strength of the expansive soil are improved obviously. Through the analysis of the comprehensive balance method, it is found that the content of lime has the greatest influence on the improvement effect of expansive soil, followed by that of coal gangue, and the least is that of fly ash. SEM structure analysis reveals that the particles of improved expansive soil are mainly aggregates, the soil structure is dense, particle agglomeration increases, and the overall structure is stronger. The research results can provide reference for the improvement of expansive soil with various admixtures and the resource utilization of coal gangue, fly ash, and other solid wastes.
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影响因子：
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作者：
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DOI：
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发表时间：
2005-06
期刊：
Journal of Wuhan University of Technology-Mater. Sci. Ed.
影响因子：
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