\r陈昌富^{1, 2}，黄佳彬^{1, 2}，张根宝^{2, 3}，朱世民\r^{1, 2}\r
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AuthorsHTML:\r陈昌富^{1, 2}，黄佳彬^{1, 2}，张根宝^{2, 3}，朱世民\r^{1, 2}\r
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AuthorsListE:\rChen Changfu^{1, 2}，Huang Jiabin^{1, 2}，Zhang Genbao^{2, 3}，Zhu Shimin\r^{1, 2}\r
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AuthorsHTMLE:\rChen Changfu^{1, 2}，Huang Jiabin^{1, 2}，Zhang Genbao^{2, 3}，Zhu Shimin\r^{1, 2}\r
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Unit:\r1. 湖南大学建筑安全与节能教育部重点实验室，长沙 410082；
2. 湖南大学岩土工程研究所，长沙 410082；
3. 湖南城市学院，益阳 413000\r
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Unit_EngLish:\r1. Key Laboratory of Building Safety and Energy Efficiency of Ministry of Education，Hunan University，Changsha 410082，China；\r\r2. Institute of Geotechnical Engineering，Hunan University，Changsha 410082，China；
\r\r3. Hunan City University，Yiyang 413000，China\r
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Abstract_Chinese:\r加筋水泥土桩锚支护技术广泛应用于边坡与基坑工程的加固，而常用的钢筋等金属材料筋体在富水及高腐蚀性的环境中往往会面临锈蚀的风险．玻璃纤维增强塑料筋(GFRP 筋)因其抗拉强度高、抗腐蚀性强等特点将成为金属材料筋体的重要替代．为揭示GFRP 筋-水泥土界面的黏结特性，通过12 组不同配比下水泥土的无侧限抗压强度试验以及对应水泥土中GFRP 筋的单元体中心拉拔试验，获得了GFRP 筋-水泥土界面黏结滑移曲线，并进一步得到了界面黏结强度与水泥掺入比及土体含水量的相关关系．基于界面黏结滑移曲线的形态特征，对GFRP 筋-水泥土界面的承载过程及机理进行了分析．研究结果表明：GFRP 筋-水泥土界面黏结强度随土体含水量的增大而降低，随水泥掺入比的增大而升高；GFRP 筋-水泥土界面极限黏结强度与筋体周围水泥土的无侧限抗压强度呈明显的线性关系；界面黏结滑移曲线可分为弹性段、软化段、残余上升段、残余下降段4 个阶段，各阶段分界点对应的界面黏结强度与界面极限黏结强度间存在不同的比例关系，可引入强度折减系数进行刻画．本文研究揭示了GFRP 筋在水泥土中的黏结强度发挥机理，建立了基于水泥土配比的界面黏结强度预测模型，为GFRP 筋加筋水泥土技术的工程应用提供了理论依据．\r
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Abstract_English:\rReinforced cemented soil piled or anchored structures are extensively used in slope stabilization and excavation support. However, the conventionally used metal reinforcement usually faces corrosion risk in the environment with rich water and corrosive substances. Owing to its characteristics such as high tensile strength and corrosion resistance, glass fiber reinforced polymer (GFRP) tendon tends to be a competitive alternative to metal reinforcement. To reveal the interface bond behavior of GFRP tendon embedded in cemented soils, 12 groups of tests, including uniaxial compression tests on cemented soil specimens and element pull-out tests on GFRP tendon reinforced cemented soil specimens, were conducted with varying cemented soil dosages. Moreover, the bond–slip curves for pull-out specimens, together with the correlation associating the interface bond strength with the cement and moisture contents, were obtained. On the basis of the characteristics of bond–slip curves, the bond mobilization process and mechanism of the interface between GFRP tendon and cemented soil were analyzed. Research results indicate that the interface bond strength decreased with the increase in moisture content but increased with the increase in cement content. The ultimate interface bond strength tended to be linearly correlated with the uniaxial compressive strength of cemented soil
near the tendons. The bond–slip curve was characterized by four consecutive stages, i.e., elastic, strain-softening, re2019 sidual-ascending, and residual-descending stages. The interface bond strengths corresponding to the demarcation points of various stages were correlated with the ultimate interface bond strength in different proportions, which can be characterized by reduction factors. The research in this paper uncovers the mobilizing mechanism of bond strength of GFRP tendons embedded in cemented soils and establishes a prediction model for the interface bond strength based on cemented soil dosage, providing theoretical reference for engineering applications of GFRP tendons reinforced cemented soil structures.\r
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Keyword_Chinese:水泥土；GFRP筋；水泥掺入比；含水量；界面黏结强度；预测模型\r

Keywords_English:cemented soil；GFRP tendon；cement content；moisture content；interface bond strength；prediction model\r


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