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采用能量分析法将让压锚杆的荷载-位移曲线划分为弹性阶段、让压阶段和塑性强化阶段.分别推出3个阶段让压锚杆的能量本构方程以及围岩作用下的能量方程.近似求解让压锚杆和普通锚杆在弹性极限荷载、承载力极限以及围岩共同作用条件下的支护性能.结果表明:在3种不同条件下,让压锚杆的支护能力较普通锚杆分别提升了52.3%,211.2%,77.3%.依据组合拱理论给出了让压锚杆的支护数量、间距、长度、最大预留空间等参数的理论公式.
The energy analysis method is used to divide the load-displacement curve of the compression anchor rod into the elastic phases and let the compression and plastic strengthening phases. The energy constitutive equations and the energy equations under the action of surrounding rock are introduced respectively in three stages. The approximate solution of the supporting capacity of the compression anchor rod and the common anchor rod under the elastic ultimate load, the bearing capacity limit and the joint action of the surrounding rock is obtained. The results show that under three different conditions, The bollards are raised by 52.3%, 211.2% and 77.3% respectively.The theoretical formulas of the parameters such as the number of support bolts, the spacing, the length and the maximum reserved space are given according to the combined arch theory.