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隧道建设(中英文) ›› 2019, Vol. 39 ›› Issue (S2): 169-175.DOI: 10.3973/j.issn.2096-4498.2019.S2.022

• 研究与探索 • 上一篇    下一篇

基于ANSYS Workbench 对螺母与锚杆螺纹联结的数值分析

马武祥, 许岩波, 肖智广, 许战波   

  1. (洛阳恒诺锚固技术有限公司, 河南洛阳 471000)
  • 收稿日期:2019-09-16 出版日期:2019-12-31 发布日期:2020-04-04
  • 作者简介:马武祥(1992—),男,河南洛阳人,2018 年毕业于西安科技大学,材料物理与化学专业,硕士,主要从事岩土锚固技术的研究开发工 作。E-mail: lymwxiang16@ sina. com。
  • 基金资助:

    洛阳市科学技术局(1804002B)

Numerical Analysis of Nut and Anchor for Threaded Connection Based on ANSYS Workbench

MA Wuxiang, XU Yanbo, XIAO Zhiguang, XU Zhanbo   

  1. (Luoyang Hengnuo Anchor Technology Co., Ltd., Luoyang 471000, China)
  • Received:2019-09-16 Online:2019-12-31 Published:2020-04-04

摘要:

为达到自钻式锚杆在岩土锚固工程中的支护稳定性,保证锚杆抗拉力和蠕变性能,需满足配件与锚杆等强。通过ANSYS Workbench 对R32 锚杆与螺母配合后在轴向载荷作用下的应力和变形的有限元数值模拟分析,结果表明: 1)在400 kN 作用力下, 径向配合间隙为0. 2 mm 时,锚杆与螺母联结最大应力值基本位于前3 个联结螺纹的底部,65 mm 长的螺母配合模型整体变形仅 0. 68 mm。2)0. 5 mm 的径向配合间隙的变形值较0. 2 mm 时增加97. 06%。通过在0. 2 mm 间隙条件下与50 mm 长的螺母配合比较可知,50 mm 的螺母全长存在较大的应力区域,变形贯穿所有螺纹,存在失效风险。整体数值分析结果说明螺母在长度为65 mm 时和锚杆配合间隙≥0. 5 mm 的情况下不能满足系统等强要求,而配合间隙≤0. 2 mm 的情况下,可满足锚杆系统的等强要求。试验验证的结果显示出与分析的一致性,系统拉伸时,90%的试样均在螺母与锚杆连接的底部出现失效断裂,其力值的变化也符合螺纹底部硬度测试规律。

关键词: 螺纹联结, 螺母, 自钻式锚杆, 配合间隙, 数值分析, Workbench

Abstract:

In order to guarantee the support stability, tensile and creep properties of self-drilling anchor in rock and soil anchoring engineering, the strength of accessories and anchor should be matched. The numerical simulation analysis on stress and deformation of R32 nut and anchor under the axial load is carried out by ANSYS Workbench. The analytical results show that: (1) When the radial fit clearance is 0. 2 mm, the maximum force value of the coupling is basically located at the bottom of the first three coupling threads and the total deformation of model with 65 mm-long nut is only 0. 68 mm under 400 kN. (2) The deformation value when the fit clearance is 0. 5 mm increases by 97. 06% than that when the fit clearance is 0. 2 mm. It shows that the 50 mm-long nut has a large stress area in the whole length, the deformation runs through all threads, and there is a risk of failure by comparison of fitting condition with the 50 mm-long nut under the condition of 0. 2 mm fit clearance. The overall numerical analysis results indicate that the 65 mm-long nut and the fit condition of 0. 5 mm cannot meet the strong requirements of the system, while the fit clearance of 0. 2 mm can. The results are verified by the experiment and show the consistency with the analytical results. When the system is stretched, 90% of the samples show failure fracture at the bottom of the connection between the nut and the anchor, and the variation of the force value also conforms to the hardness test rule at the bottom of thread.

Key words: threaded connection, nut, self-drilling anchor, fit clearance, numerical analysis, Workbench

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