| 砂土串囊式充气锚杆承载力的研究 |
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| 引用本文： | 陈秋南,杨蒙,衣利伟.砂土串囊式充气锚杆承载力的研究[J].应用力学学报,2021(1):78-85. |
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| 作者姓名： | 陈秋南 杨蒙 衣利伟 |
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| 作者单位： | 湖南科技大学岩土工程稳定控制与健康监测省重点实验室;湖南科技大学土木工程学院;中建隧道建设有限公司 |
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| 基金项目： | 国家自然科学基金(41372303,51878270,51778227);湖南省教育厅科学研究项目(18K064);湖南省交通厅科技进步与创新项目(201712)。 |
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| 摘 要： | 在砂土地层中,串囊式充气锚杆的研究还比较少,其承载特性及受力机理尚不明确。本文基于莫尔-库仑模型和Vesic圆孔扩张理论法,分别对圆柱体、球体、组合体、椭球体假设下的串囊式充气锚杆的扩大段进行计算分析。并将计算结果与试验得到的实测值进行对比。结果表明:四种形状假设中椭球体的形状假设理论值与实测值的误差最小,仅为8.35%。通过拟合试验数据,并引入与端阻力和侧摩阻力有关的两个系数对承载力公式进行修正,得到了抗拔承载力的经验公式。
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| 关 键 词： | 串囊式充气锚杆 受力机理 极限承载力 砂土地层 扩大段形状 |
Experimental study on group anchor effect of inflatable anchor with several airbags in sand stratum |
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| Chen Qiunan,Yang Meng,Yi Liwei.Experimental study on group anchor effect of inflatable anchor with several airbags in sand stratum[J].Chinese Journal of Applied Mechanics,2021(1):78-85. |
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| Authors: | Chen Qiunan Yang Meng Yi Liwei |
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| Institution: | (Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring,Hunan University of Science and Technology,411201 Xiangtan,China;College of Civil Engineering,Hunan University of Science and Technology,411201,Xiangtan,China;Zhongjian Tunnel Construction Co.,Ltd.401320,Banan District,Chongqing,China) |
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| Abstract: | In the sandy soil layer, the research on the gas filled string bolt is still less, and its bearing characteristics and bearing mechanism are not clear. In this paper, based on the Mohr Coulomb model and the Vesic circular hole expansion theory, the expansion sections of the inflatable string anchor under the assumptions of cylinder, sphere, combination and ellipsoid are calculated and analyzed, respectively. The calculated results are compared with the measured values. The results show that among the 4 different assumptions, the error between the theoretical value and the measured value is the smallest, only 8.35%. By fitting the test data and introducing two coefficients related to end resistance and side friction resistance, the empirical formula of uplift bearing capacity is obtained. |
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| Keywords: | inflatable anchor of several airbags group anchor effect ultimate bearing capacity sandy soil stratum enlarged segment shape |
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