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Experimental investigation of surrounding-rock anchoring synergistic component for bolt support in tunnels

机译：隧道中螺栓支撑锚杆锚固协同成分的实验研究

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As an economical and effective active support method, bolt support has been widely used in engineering support for tunnels, slopes, and underground mining, and has achieved notable economic and social benefits. This study mainly investigated the optimization of the bolt anchoring structure and the enhancement of the bolt's ability to control the surrounding rock deformation. Resin grout plays a very important role in bolt support. The resin mixing effects, non-uniformity thickness of the resin annulus, and the collapse of the borehole wall lead to the bending of the resin cartridges and poor bolt concentricity, which severely affect the anchoring force of the anchoring structure. An anchoring synergistic component (ASC) was independently developed by our research group to solve these problems. By combining the numerical simulation and laboratory test results, the main parameters of the ASC were determined and optimized. The displacement and absorption energy at the peak anchoring force, bolt concentricity, and distribution of the resin grout were analyzed and compared, both with and without the ASC. The anchoring force and bearing capacity of the anchoring structure were noticeably improved with the ASC installed between the resin cartridges. The resin grout distribution at the anchoring end and the bolt concentricity were also greatly improved. Additionally, the problem of resin grout outflow during the process of bolt installation for rock roof support in tunnels and underground mining was adequately mitigated, and the effective anchoring length of the bolt was ensured. The results of this study provide a theoretical basis and design reference for the optimization of an anchoring structure under conditions similar to those considered in this study.
机译：作为一种经济且有效的主动支持方法，螺栓支持已广泛用于工程支持，对隧道，斜坡和地下采矿，并取得了显着的经济和社会效益。本研究主要研究了螺栓锚固结构的优化和螺栓控制周围岩石变形的能力的增强。树脂灌浆在螺栓支撑中起着非常重要的作用。树脂混合效果，树脂环的不均匀性厚度，并且钻孔壁的塌陷导致树脂盒的弯曲和较差的螺栓同心度，这严重影响了锚固结构的锚固力。我们的研究小组独立开发了一种锚固协同成分（ASC）以解决这些问题。通过组合数值模拟和实验室测试结果，确定和优化ASC的主要参数。分析并与ASC的峰值锚固力，螺栓同心度和树脂灌浆的分布处的位移和吸收能量进行分析，并进行比较。锚固结构的锚固力和承载力随着树脂盒之间安装的ASC明显改善。锚固端和螺栓同心度的树脂灌浆分布也大大提高。另外，在隧道和地下挖掘过程中螺栓安装过程中的树脂泥浆流出的问题得到充分减轻，确保了螺栓的有效锚固长度。该研究的结果为在与本研究中考虑的那些类似的条件下提供了理论基础和设计参考。

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