Study on Influence of Rock Strength on Anchorage Performance of Resin Anchored Bolts

Hu, Bin

doi:10.4028/www.scientific.net/amr.962-965.968

Cited by 10 publications

(11 citation statements)

References 4 publications

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“…e results show that the temperature has a great influence on the anchorage performance; the anchoring force of resin grout reaches its peak value when the temperature is at 25°C, and the increase or decrease of temperature will affect the anchoring force [7]. Aziz et al carried out a series of pullout tests and found that mixing time and bolt hole parameters have a significant impact on the anchoring force; approximately 10 s constitutes a suitable time for bolt installation; and the drilling of bolt holes contributes to improving load transfer capacity [8].…”

Section: Introductionmentioning

confidence: 94%

Experimental Study on Anchorage Performance of Resin Grout with Steel Segment

Jun-chao

2021

Advances in Civil Engineering

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With the advantages of large anchoring force and fast anchoring speed, resin cartridge has become the main anchoring means of geotechnical engineering and underground space engineering support. Based on the theoretical analysis, it is clear that adding aggregate can improve the mechanical properties of grout and the bolt-grout interface stress state; the mechanical properties of aggregate are positively correlated with its improvement effect on anchorage performance. By using the numerical simulation method, it is concluded that the addition of steel segments into the resin grout can improve the stiffness of the anchorage system and enhance the energy absorption and antifailure ability of the anchorage system. Relying on the self-developed anchorage mixing device, the effects of steel segment diameter and addition amount on the anchoring force were studied experimentally, and the optimal addition amount of different types of steel segment to improve the maximum anchoring force was determined.

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Section: Introductionmentioning

confidence: 94%

Experimental Study on Anchorage Performance of Resin Grout with Steel Segment

Jun-chao

2021

Advances in Civil Engineering

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“…Zhang et al simulated the resin anchor-hold at different temperatures and obtained the temperature around the drill hole can influence the resin anchor-hold [12]. Hu used a combination of laboratory tests and numerical simulation to study the effect of temperature on the anchoring properties of resin anchors [13]. To solve the problem of adaptability of the full-length anchorage agent technology and ensure the strength of the anchoring support in high ground temperatures, it is urgent to develop a new type of heat-resistant, high-strength, and full-length anchoring agent.…”

Section: Introductionmentioning

confidence: 99%

Development, Performance, and Microscopic Analysis of New Anchorage Agent with Heat Resistance, High Strength, and Full Length

Liu

Yao

Xue

et al. 2019

Advances in Materials Science and Engineering

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To solve the difficult problems of failure of pretensioned bolt supports under high ground pressure and temperature, a new kind of anchorage agent with excellent performance is developed. First, the selection and compounding of raw materials were conducted. The new anchorage agent was obtained by modifying the PET resin by mixing with a phenolic epoxy vinyl ester resin (FX-470 resin) and adding a KH-570 silane coupling agent. Then, the viscosity, thermal stability, compressive strength under different temperatures, and anchorage capacity of the new anchorage agent were tested. Moreover, the best proportion ratio of anchorage agent by mixing resin : coarse stone powder : fine stone powder : accelerator : curing agent : KH-570 = 100 : 275 : 275 : 1 : 32.5 : 1 is obtained. The test results showed that, with the addition of a KH-570 silane coupling agent, the viscosity decreased significantly, thereby solving the difficult technical problems of pretensioned bolt supports in full-length anchorage support. Compared with the conventional anchorage agent, the compressive strength of the new anchorage agent increased by 20.4, 82.5, 118.2, and 237.5% at 10, 50, 80, and 110°C, respectively, and the anchorage capacity increased by 4.7, 8.7, 40.2, and 62.9% at 30, 50, 80, and 110°C, respectively. Finally, the enhancement in compressive strength and heat-resistant mechanism are revealed through microanalysis.

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“…Huet al studied the influence of temperature on the anchoring performance of a resin anchor by combining a laboratory test and numerical simulation. e results showed that the anchoring force of the anchorage body was the largest at 25°C, and the anchoring force clearly decreased with the increase of simulated drilling temperature [12]. Based on the thick wall theory, Zhao and other researchers studied the relationship between anchor rib spacing and anchorage performance under different country rock conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Failure Mechanism of the Anchorage Interface under Different Surrounding Rock Strengths and Ambient Temperatures

Liu

Yao

Xue

et al. 2021

Advances in Civil Engineering

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In order to study the anchoring instability mechanism of surrounding rock in deep roadway, the failure mechanism of the bolt-anchoring agent interface was studied by simulating different strength rock mass and ground temperature environment, using C20, C40, and C60 strength concrete and steel pipe to simulate different surrounding rock strength environments. Indoor pull-out tests were carried out to study the pull-out load displacement relationship, ultimate pull-out force, residual anchoring force, the distribution law of axial stress and tangential stress along the bar, and the energy consumption value of drawing failure at 20, 50, and 70°C. The test results show that, with the decrease of surrounding rock strength or the increase of ambient temperature, the pull-out force, residual anchoring force, and energy consumption value of anchorage interface gradually decrease; under different axial forces, the axial force distribution of the rod body decreases exponentially from the anchoring end to the opposite end; and the shear stress transfers to the deep part of the anchor body with the increase of the load. According to the failure phenomenon of the specimen, the failure modes of the bolt bolt-anchorage agent interface can be divided into shear slip mode and shear expansion slip mode. The shear expansion slip formula of anchorage interface is derived. Using high-strength and temperature-resistant resin anchoring agent for comparative test, the rationality of the mechanism analysis is proved, which provides more clear guidance for the construction of anchor support.

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Study on Influence of Rock Strength on Anchorage Performance of Resin Anchored Bolts

Cited by 10 publications

References 4 publications

Experimental Study on Anchorage Performance of Resin Grout with Steel Segment

Experimental Study on Anchorage Performance of Resin Grout with Steel Segment

Development, Performance, and Microscopic Analysis of New Anchorage Agent with Heat Resistance, High Strength, and Full Length

Experimental Study of the Failure Mechanism of the Anchorage Interface under Different Surrounding Rock Strengths and Ambient Temperatures

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