地下洞室全长黏结式锚杆动力有限元模拟

发布时间：2018-05-16 23:27

本文选题：地下工程 + 黏结式锚杆　；参考：《岩石力学与工程学报》2017年S1期

【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。
[Abstract]:Based on the basic stress equation of anchor body, the load transfer control equation of anchor rod and surrounding rock is derived, and the finite difference scheme is used to transform it into linear equation group. Considering the free deformation displacement of surrounding rock, the damage of the interface of anchor body is considered. The displacement of Anchorage is obtained by iterative solution, and then the distribution of normal stress and interfacial shear stress along the length of bolt is obtained, and a dynamic algorithm of Anchorage with shear damage at the interface of Anchorage under earthquake is formed. At first, the rationality of the algorithm is verified by static calculation, and then applied to the dynamic calculation of engineering examples. The results show that the algorithm can well simulate the effect of bolt support, and the force of anchor body accords with the neutral point theory. During the earthquake the normal stress of the bolt increases with time and the interface shear stress near the anchor head is larger which is the most vulnerable to damage under earthquake.
【作者单位】：武汉大学水资源与水电工程科学国家重点实验室;武汉大学水工岩石力学教育部重点实验室;
【基金】：国家重点基础研究发展计划“973”项目(2015CB057904) 国家自然科学基金资助项目(51579191,51279136)~~
【分类号】：TU476

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