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在岩体中开挖隧洞常常采用锚杆支护来保证其稳定性,本文主要介绍用“收敛—约束”法对点锚固锚杆的计算分析。实际上,是在确认现有的两种分析中的某些局限性后,又研究出了一种新的分析方法。首先介绍新方法的改进建议以及制定新理论的一些主要依据,然后,阐述分析计算方法,并用图解描述在锚固拱部承载环和周围介质的应力和位移变化,以及锚固岩体的收敛曲线。最后,应用数值分析阐明新方法一些特性的影响。
In tunnel excavation of rock mass, bolt support is often used to ensure its stability. This paper mainly introduces the calculation and analysis of point anchored rock bolt by “convergence-constraint” method. In fact, after confirming some limitations of the two existing analyzes, a new analytical method has been developed. First of all, some suggestions are given to improve the new method and some main principles of the new theory. Then, the methods of analysis and calculation are expounded. The stress and displacement of the anchor ring and the surrounding media are also illustrated. The convergence curves of the anchored rock mass are also illustrated. Finally, numerical analysis is used to illustrate the impact of some of the new methods.