位伟, 姜清辉, 周创兵. 节理面附近锚杆力学模型及其数值流形方法应用[J]. 工程力学, 2014, 31(11): 70-78. DOI: 10.6052/j.issn.1000-4750.2013.01.0016
引用本文: 位伟, 姜清辉, 周创兵. 节理面附近锚杆力学模型及其数值流形方法应用[J]. 工程力学, 2014, 31(11): 70-78. DOI: 10.6052/j.issn.1000-4750.2013.01.0016
WEI Wei, JIANG Qing-hui, ZHOU Chuang-bing. A MECHANICAL MODEL OF A BOLT IN THE VICINITY OF A JOINT AND ITS NUMERICAL MANIFOLD METHOD (NMM) APPLICATION[J]. Engineering Mechanics, 2014, 31(11): 70-78. DOI: 10.6052/j.issn.1000-4750.2013.01.0016
Citation: WEI Wei, JIANG Qing-hui, ZHOU Chuang-bing. A MECHANICAL MODEL OF A BOLT IN THE VICINITY OF A JOINT AND ITS NUMERICAL MANIFOLD METHOD (NMM) APPLICATION[J]. Engineering Mechanics, 2014, 31(11): 70-78. DOI: 10.6052/j.issn.1000-4750.2013.01.0016

节理面附近锚杆力学模型及其数值流形方法应用

A MECHANICAL MODEL OF A BOLT IN THE VICINITY OF A JOINT AND ITS NUMERICAL MANIFOLD METHOD (NMM) APPLICATION

  • 摘要: 建立了节理面附近锚杆的梁单元模型。该锚杆模型不仅能够准确模拟结构面附近锚杆与结构面的相互作用,而且可以综合反映锚杆的拉压、剪切、弯曲变形以及锚杆进入塑性屈服后的硬化特性。基于该锚杆模型以及数值流形方法的基本原理,发展了锚固节理岩体的流形元模拟方法。由于在数值流形方法中锚杆构件可作为物理网格输入,因此锚杆单元的布设与流形单元网格无关,从而简化了锚杆单元的前处理工作,可以实现大规模锚杆的精细化模拟。通过与加锚节理面直剪试验结果的对比分析,两者较为吻合,验证了该锚杆模型有效性。最后,将该锚杆模型运用于水布垭地下厂房围岩的支护研究,算例表明,该模型较好地反映了锚固岩体的变形行为以及锚杆的加固效果。

     

    Abstract: This study presented a beam element model for bolts near the joints in jointed rock masses. The model is able to capture the characteristics of bolts near the joints, including tension, compression, bending, and shearing deformation and plastic hardening after yielding. After incorporating the model into the numerical manifold method, a numerical method for anchored jointed rock masses is proposed. Since bolts can be treated as physical meshes in the numerical manifold method, bolt elements are independent of manifold meshes in our method. Thus, the numerical preprocessing involved in bolts is significantly simplified, and the sophisticated simulation of large-scale bolts is also achieved. A good agreement between numerical results and the test data of a bolted joint plane was observed, demonstrating the effectiveness of the proposed model. Finally, the model is applied in the surrounding rock-supporting system in the underground powerhouse of the Shuibuya project. Numerical results show that the model can properly capture the features of the deformation of bolted rocks and the support effects.

     

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