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王盛年, 谷雷雷, 吴志坚, 崔晓艳, 薛钦培, 徐鑫磊, 旦东. 纤维地聚物复合改良粗粒填料动力变形特性试验研究[J]. 岩土工程学报, 2024, 46(S2): 183-188. DOI: 10.11779/CJGE2024S20035
引用本文: 王盛年, 谷雷雷, 吴志坚, 崔晓艳, 薛钦培, 徐鑫磊, 旦东. 纤维地聚物复合改良粗粒填料动力变形特性试验研究[J]. 岩土工程学报, 2024, 46(S2): 183-188. DOI: 10.11779/CJGE2024S20035
WANG Shengnian, GU Leilei, WU Zhijian, CUI Xiaoyan, XUE Qinpei, XU Xinlei, DAN Dong. Dynamic deformation characteristics of fiber and geopolymer-stabilized coarse-grained fillers[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(S2): 183-188. DOI: 10.11779/CJGE2024S20035
Citation: WANG Shengnian, GU Leilei, WU Zhijian, CUI Xiaoyan, XUE Qinpei, XU Xinlei, DAN Dong. Dynamic deformation characteristics of fiber and geopolymer-stabilized coarse-grained fillers[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(S2): 183-188. DOI: 10.11779/CJGE2024S20035

纤维地聚物复合改良粗粒填料动力变形特性试验研究

Dynamic deformation characteristics of fiber and geopolymer-stabilized coarse-grained fillers

  • 摘要: 纤维地聚物复合改良可提升粗粒填料强度、刚度等性能,减小受长期动载作用引发的累积塑性变形。通过抗压强度试验探讨地聚物理想组分设计及其与纤维在土中的最佳配比,然后开展纤维地聚物复合改良粗粒填料抗压、循环加卸载试验,分析块石含量、应力水平对其累积变形特性和破坏模式的影响。结果表明:地聚物中偏高岭土、硅酸钠和生石灰最佳质量比为3.6∶1∶0.8,三者在土中最优掺量为15%,纤维最佳掺量和长度为0.4%和12 mm;纤维地聚物复合改良粗粒填料抗压强度随块石含量呈先增后减再增变化,块石含量30%时其力学性能最好;纤维地聚物复合改良粗粒填料动力累积应变速率随循环加卸载次数增加呈先快后慢再快发展,随块石含量、荷载水平提高,裂隙数量和扩展速率增加明显,破坏模式由剪切滑移向竖向劈裂转变。研究成果可为纤维地聚物复合改良粗粒填料动力特性认知和工程应用提供参考。

     

    Abstract: The utilization of fiber and geopolymer to stabilize coarse-grained fillers can enhance their engineering performances such as strength and rigidity, and reduce the cumulative plastic deformation caused by long-term dynamic loadings. In this study, a series of unconfined compression tests are conducted to investigate the ideal material composition design of metakaolin-based geopolymer and the optimal mixing ratio of fiber and geopolymer for soil stabilization. Then, the unconfined compressive strength and cyclic loading/unloading tests on fiber and metakaolin-based geopolymer stabilized coarse-grained fillers are carried out. Their cumulative deformation characteristics and failure modes affected by rock content and loading stress level are discussed. The results show that the ideal mixing ratio of metakaolin, Na2SiO3, and CaO for preparing geopolymer is 3.6:1:0.8, and their optimal dosage for soil stabilization is 15%. The optimal content and length of basalt fiber are 0.4% and 12 mm, respectively. The compressive strength of fiber and geopolymer-stabilized coarse-grained fillers increases first, then decreases, and then increases with the rock block content. Their best mechanical performances are achieved when the rock block content is 30%. The cumulative strain rate of fiber and geopolymer-stabilized coarse-grained fillers increases first, then slowly, and then rapidly as the number of cycles increases. With the increase of the rock block content and loading stress level, the number and propagation rate of cracks increase significantly, and the failure mode of fiber and geopolymer-stabilized coarse-grained fillers changes from shear-slip to vertical splitting. This study can provide references for the dynamic cognition and engineering application of fiber and geopolymer-stabilized coarse-grained fillers.

     

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