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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。
Based on the basic force equation of anchor, the governing equations of load transfer between rock bolt and surrounding rock are deduced and transformed into linear equations using finite difference scheme. Combined with the free deformation of surrounding rock, the damage of anchor interface is corrected and corrected by An iterative solution obtains the displacement of the anchor, and then the normal stress of the anchor and the distribution of the interfacial shear stress along the length of the rod are obtained. An anchor dynamic algorithm considering the shear damage at the interface of the anchor under earthquake action is obtained. First of all, the rationality of the algorithm is verified by the static case calculation. Then it is applied to the dynamic calculation of the engineering example. The results show that the proposed method can simulate the effect of bolt support well, and the anchorage force complies with the neutral point theory During normal earthquakes, the positive stress of rock bolts tends to increase with time. The shear stress near the anchor head is larger and the damage is most likely to occur under the earthquake.