贵州大学土木工程学院,贵州 贵阳 550025
谢财进(1994—),男,硕士研究生。主要从事隧道工程方面的研究。E-mail:2697173429@qq.com
饶军应(1983—),男,副教授,博士。主要从事岩土、隧道工程方面的教学与研究。E-mail:jyrao@gzu.edu.cn
收稿:2019-04-11,
修回:2019-11-17,
纸质出版:2021-06-16
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谢财进,饶军应,刘灯凯等.不同桩芯微型桩抗弯承载力试验研究[J].防灾减灾工程学报,2021,41(03):540-548.
XIE Caijin,RAO Junying,LIU Dengkai,et al.Experimental Study on Flexural Capacity of Micro⁃piles with Different Pile Cores[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(03):540-548.
谢财进,饶军应,刘灯凯等.不同桩芯微型桩抗弯承载力试验研究[J].防灾减灾工程学报,2021,41(03):540-548. DOI: 10.13409/j.cnki.jdpme.201904001.
XIE Caijin,RAO Junying,LIU Dengkai,et al.Experimental Study on Flexural Capacity of Micro⁃piles with Different Pile Cores[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(03):540-548. DOI: 10.13409/j.cnki.jdpme.201904001.
为研究不同桩芯微型桩在隧道洞口不良地质边坡中的治理效果,拟对钢筋⁃混凝土、工字钢⁃混凝土、钢管⁃钢筋⁃混凝土、钢管⁃工字钢⁃混凝土微型桩开展抗弯极限承载力试验。研究表明,工字钢⁃混凝土微型桩相比钢筋⁃混凝土微型桩极限抗弯承载力不仅大幅度提升,其抵抗位移变形的能力也有所增加。钢筋⁃混凝土微型桩和工字钢⁃混凝土微型桩桩径由140 mm变化到203 mm,韧性分别提高25%、50%,抗弯承载力分别提高89%、91%。钢管微型桩的韧度、极限抗弯承载力都明显强于裸露混凝土桩,即使变形已非常显著,仍能继续受力。钢管⁃钢筋⁃混凝土微型桩、钢管⁃工字钢⁃混凝土微型桩桩径由140 mm变化到203 mm,抗弯承载力分别提高近256%、265%。
In order to study the treatment effect of micro-piles with different pile cores for stabilizing tunnel slopes in adverse geological conditions, a series of bending flexural tests have been conducted on micro-piles made of steel bar-concrete, steel I-beam-concrete, steel pipe-steel bar-concrete, steel pipe-steel I-beam-concrete, respectively. The test results show that both the ultimate flexural capacity and deformation resistance of the steel I-beam-concrete micro-pile are larger than those of the steel bar-concrete micro-piles. When the diameters of the steel bar-concrete and the steel I-beam-concrete micro-piles increase from 140 mm to 203 mm, the toughness is increased by 25% and 50%, respectively, and the flexural capacity is increased by 89% and 91%, respectively. The toughness and ultimate bending capacity of the steel pipe micro-pile are significantly greater than the bare concrete pile, and the loading capacity remains even when the deformation is very large. If the diameters of steel pipe-steel bar-concrete and steel pipe- steel I-beam-concrete micro-piles increase from 140 mm to 203 mm, the flexural capacity increase by nearly 256% and 265%, respectively.
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