地下洞室全长黏结式锚杆动力有限元模拟

doi:10.13722/j.cnki.jrme.2016.0551

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摘要基于锚固体基本受力方程，推导了锚杆与围岩荷载传递控制方程，并采用有限差分格式将其转化为线性方程组，结合围岩自由变形位移，考虑锚固体界面的损伤进行修正，通过迭代求解获得锚固体位移，进而得到锚固体正应力和界面剪应力沿杆长分布规律，形成了一种考虑地震作用下锚固体界面剪切损伤的锚杆动力算法。首先通过静力算例计算，验证了该算法的合理性；然后应用于工程实例的动力计算，结果表明，该算法能较好地模拟锚杆支护效果，锚固体受力符合中性点理论，地震过程中锚杆正应力随时间呈不断增加的趋势，锚头附近部位的界面剪应力较大，地震作用下最易损伤破坏。

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	刘国庆1
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	肖明1
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关键词 ：地下工程, 黏结式锚杆, 界面损伤, 动力有限元, 地震响应, 支护效应

Abstract：This paper proposes a dynamic algorithm for rock bolt considering interfacial shear damage of anchorage body under seismic load. Based on basic loading formulas of the anchorage body，the control equation of load transfer related to surrounding rock and the bolt is deduced and then is transformed into linear equations according to the finite difference method. Combined with the free deformation displacement of the rock，the modification is made considering interfacial damage of the anchorage body，and the displacement of the anchorage body is obtained by iteration operation. Furthermore，the distributions for normal stress and interfacial shear stress of the anchorage body along the bolt length are achieved. The rationality of the algorithm is validated with computed results from the static calculation examples and then the algorithm is applied to dynamic calculation of the engineering case study. The results show that the algorithm can effectively simulate the supporting effect of the bolts and the anchorage body stress distribution conforms to the neutral point theory. The results also indicate that the normal stress of the bolt suffers constant growth with time during the earthquake. The interface near the anchor head with large shear stress is easily subjected to damage under seismic load.

Key words： underground engineering fully grouted rock bolts interfacial damage dynamic finite element seismic response supporting effect

引用本文:

刘国庆1，2，肖明1，2，周浩1，2. 地下洞室全长黏结式锚杆动力有限元模拟[J]. 岩石力学与工程学报, 2017, 36(S1): 3174-3183.
LIU Guoqing1，2，XIAO Ming1，2，ZHOU Hao1，2. Simulation of fully grouted rock bolts using dynamic finite element for underground caverns. , 2017, 36(S1): 3174-3183.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2016.0551 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS1/3174

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