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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。
The beam element model of anchor near the joint surface is established. The bolt model can not only accurately simulate the interaction between the anchor and the structural plane near the structural plane, but also can comprehensively reflect the tensile, shear and bending deformation of the anchor rod and the hardening characteristics after the anchor rod enters the plastic yielding. Based on the principle of the bolt model and the numerical manifold method, a manifold element simulation method of rock mass with anchoring joints was developed. Because the bolt member can be input as a physical grid in the numerical manifold method, the layout of the anchor rod unit is not related to the manifold element mesh, thus simplifying the pre-processing of the anchor rod unit and enabling the fineness of the large-scale anchor rod Simulation. By comparing with the results of direct shear test of anchoring joints, the two are in good agreement with each other to verify the effectiveness of the bolt model. Finally, the bolt model is applied to the supporting study of the surrounding rock of the Shuibuya underground powerhouse. The results show that the model can well reflect the deformation behavior of the anchored rock mass and the reinforcement effect of the anchor.