Traditionally steel has been used for rock bolts in tunnelling. Faced with the challenge of reducing mankind's environmental impact, it is necessary to look at using better alternatives. Glass-fibre-reinforced polymer (GFRP) has been used for many years in tunnelling applications, primarily for temporary applications. GFRP has many advantages such as its excellent durability characteristics, its light weight, which reduces manual handling impacts on workers in the tunnel, and its lower environmental impact. One obstacle to the more widespread adoption of GFRP for permanent applications has been a concern over its performance in shear. It is well understood that during shearing the rock bolts actually deform under bending and the tensile strength of the bolt governs the behaviour. This paper will describe a new design method to account for the benefit of the bolts in resisting shearing on discontinuity planes. This method can be used in numerical models to demonstrate that GFRP bolts function as well as steel bolts in terms of resisting both tensile and shear loading from the rock mass. This opens the path for the wider use of GFRP rock bolts, which offer superior durability and a lower environmental impact.

中文翻译：

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玻璃纤维增​​强聚合物：永久性岩栓的低二氧化碳选择

传统上，钢已用于隧道掘进中的锚杆。面对减少人类环境影响的挑战，有必要考虑使用更好的替代品。玻璃纤维增​​强聚合物（GFRP）在隧道应用中已经使用了很多年，主要用于临时应用。GFRP具有许多优势，例如出色的耐用性，轻巧的重量（减少了对隧道工人的人工搬运的影响）以及较低的环境影响。GFRP永久性应用的一大障碍是其剪切性能。众所周知，在剪切过程中，岩石螺栓实际上在弯曲下变形，并且螺栓的抗拉强度决定了性能。本文将介绍一种新的设计方法，以说明螺栓在抵抗不连续平面上的剪切方面的优势。此方法可用于数值模型，以证明GFRP螺栓在抵抗岩体的拉伸和剪切载荷方面的作用与钢制螺栓相同。这为GFRP锚杆的广泛使用开辟了道路，这些锚杆具有出色的耐用性和较低的环境影响。