Abstract
The function of a resin anchoring agent is to bond the rock of a borehole wall with the body of the anchor so the anchor can play an effective supporting role. The anchoring effect is related to the performance of the resin anchoring agent used and to the stirring rate applied during the anchor installation process. In this report, the stirring rate of the resin anchoring agent is evaluated and discussed in terms of how it affects pore structure and anchoring strength. When the stirring rate is in the range of 400–950 r/min, the uniaxial compressive strength of the resin anchoring agent increases proportionally with the stirring rate, and the compressive strength corresponding to the maximum stirring rate is 15.1% greater than that corresponding to the minimum stirring rate. Conversely, the pore size of the foam inside the resin anchoring agent is inversely proportional to the stirring rate, and the pore size corresponding to the maximum stirring rate is 15.1% smaller than that corresponding to the minimum stirring rate. The anchoring strength increases proportionally with the stirring rate when the stirring rate is between 400 and 800 r/min. Specifically, the anchoring strength associated with the maximum stirring rate is 9.2% greater than the anchoring strength corresponding to the minimum stirring rate. As the stirring time increases from 20 to 60 s, the anchoring force first increases and then decreases, with the optimal stirring time determined to be about 50 s. The results presented herein can be applied to improve anchor installation technology and the anchoring strength of resin anchoring agents.
Highlights
A resin anchoring agent is a type of sticky bonding material comprising unsaturated polyester resin, curing agent, accelerator, and other auxiliary materials in a certain proportion [1,2,3,4]. e components of this material are typically divided and packed with polyester film into a cartridge
A thorough literature survey revealed that existing studies of resin anchoring agents often lack any evaluation of the effect of different stirring rates on the anchoring agent performance; the stirring rate is known to influence the solidified compactness of such materials, affecting their anchoring performance. erefore, we report the influence of stirring rate on the internal pore structure and anchoring strength of resin anchoring agents based on uniaxial compression tests, scanning electron microscopy (SEM), and pull-out tests. e results of this study can be applied to improve the anchoring performance of resin anchoring agents
E relationship between the uniaxial compressive strength and the stirring rate of the test specimens is shown in Figure 11, and the relationship between the average compressive strength and the stirring rate of anchor specimens is shown in Figure 12. e stirring rates of resin anchoring agents ranged from 400 to 950 r/min
Summary
A resin anchoring agent is a type of sticky bonding material comprising unsaturated polyester resin, curing agent, accelerator, and other auxiliary materials in a certain proportion [1,2,3,4]. e components of this material are typically divided and packed with polyester film into a cartridge. Theoretical analysis, and numerical simulations, scholars have comprehensively analyzed the anchoring mechanism and elucidated numerous factors that influence the anchoring performance of resin anchoring agents [11,12,13,14]. Drilling water, flowing water, and water accumulation in the hole have a significant impact on the resin anchoring agent’s performance; the drainage effect can be improved by properly arranging the drainage holes [15,16,17,18]. E temperature has a significant impact on the anchoring performance of a resin anchoring agent; the anchoring force is the largest at a temperature of 25°C. The anchoring force of the resin anchor rod exhibited a significant decreasing trend as the drilling temperature increased [21, 22]. The anchoring force of the resin anchor rod exhibited a significant decreasing trend as the drilling temperature increased [21, 22]. e shape of the anchor
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