| 上覆压力和剪胀作用下土钉抗拔的有限元模拟 |
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| 引用本文： | 周万欢,殷建华.上覆压力和剪胀作用下土钉抗拔的有限元模拟[J].岩土力学,2011,32(Z1):691-0696. |
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| 作者姓名： | 周万欢 殷建华 |
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| 作者单位： | 澳门大学土木及环境工程系;香港理工大学土木及结构工程学系 |
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| 基金项目： | 澳门大学研究基金(No.SRF014/09-10S/ZWH/FST) |
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| 摘 要： | 灌浆土钉在边坡加固工程中有着广泛的应用。土钉在不同条件下的抗拔机制仍是进一步研究的课题。通过建立一个三维有限元模型,研究土钉在不同上覆压力和剪胀作用下的土钉抗拔行为。采用摩尔-库仑模型模拟花岗岩土,土与土钉界面采用"接触对"和库仑摩擦模型描述。模型可以模拟土钉发生较大抗拔位移下发生滑移破坏的过程。模型参数通过三轴试验结果进行校正。通过与大尺寸室内抗拔试验结果相比较,验证了模型的有效性。模型展现了土钉在钻孔后和抗拔过程中土钉周围的土压力的变化。最后通过参数分析,研究了上覆压力和剪胀对土钉抗拔力的影响。结果显示,当上覆压力较小时,剪胀角对抗拔应力的影响较小。随着上覆压力的增加,剪胀角对抗拔应力的影响变得更加明显。
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| 关 键 词： | 土钉 抗拔力 有限元 上覆压力 剪胀 参数分析 |
| 收稿时间： | 2011-01-18 |
Finite element modeling soil nail pullout behavior and effects of overburden pressure and dilation |
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| ZHOU Wan-huan,YIN Jian-hua.Finite element modeling soil nail pullout behavior and effects of overburden pressure and dilation[J].Rock and Soil Mechanics,2011,32(Z1):691-0696. |
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| Authors: | ZHOU Wan-huan YIN Jian-hua |
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| Institution: | 1. Department of Civil and Environmental Engineering, University of Macau, Macao, China; 2. Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hong Kong, China |
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| Abstract: | Grouted soil nails are widely used in the slope stabilization projects. It is of great interests to engineers and researchers to study the mechanism of the soil nail pullout resistance under different conditions. In this paper, a three-dimensional (3D) finite element (FE) model is developed to simulate the behavior of soil nail considering the effects of overburden pressure and dilation. The Mohr-Coulomb model is adopted to simulate the soil behavior. The interaction between the soil nail surface and the surrounding soil is modeled by Coulomb model. Contact pairs are used at the soil-nail interface so that the sliding failure can be considered during the pullout analysis. The model parameters are calibrated by the triaxial soil test data. It is found that the selected model can represent the soil stress-strain behaviour under different confining pressures. Large scale laboratory pullout test data are used to compare with the modelling results and verify the model. The soil stress variations surrounding the soil nail before and during pullout are demonstrated in FE modelling. Parametric analysis is carried out to investigate the effects of soil dilation and overburden pressure on the soil nail pullout resistance. It is found that the effect of interface soil dilation under small overburden pressures is not so significant as that under OP = 200 kPa and 300 kPa. |
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| Keywords: | soil nailing pullout resistance finite elements overburden pressure dilation parametric analysis |
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