State of the art review of the large deformation rock bolts

Sui, Qiru; He, Manchao; He, Pengbo; Xia, Min; Tao, Zhigang

doi:10.1016/j.undsp.2021.11.001

Cited by 41 publications

(4 citation statements)

References 61 publications

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“…It has been determined that the use of polyamide absorber nuts with steel nuts and washers instead of using them alone provides much higher load bearing and energy absorption capacity. New engineering polymers have provided revolutionary benefits in solving many problems in rock bolting applications [44][45][46]. As seen in this study, polyamide type polymer materials can also provide various advantages for the fixation of rock bolt plates.…”

Section: Discussionmentioning

confidence: 81%

Investigation of New Energy Absorbing Mechanisms Used to Fix Rock Bolt Plates

Komurlu

2023

Period. Polytech. Civil Eng.

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In this study, different plate fixing designs were tested in order to improve rock bolting performances. Instead of commonly used steel nuts, different plate fixing designs were investigated by both laboratory and site studies. In addition, the usability of nuts and energy absorbers made of the polyamide type engineering polymer was investigated to assess whether they are advantageous for the aim of supplying high-energy absorbing features. In this experimental study, deformation-controlled load tests were carried out to evaluate the bearing and energy absorption capacities of totally eight different groups of specimens. According to the findings from this study, use of the polyamide material with steel nuts as an energy absorber material, rather than using instead of steel nuts supplies good results. As another outcome, it has been determined that use of proper washers between steel nuts and polyamide absorbers can significantly improve the energy absorption performances. It has been evaluated that the energy absorption capacity of the bolt plates can be economically increased up to 10 times by using suitable polyamide energy absorbers placed between the plate and steel nut parts. It was concluded that the polyamides can be used to remarkably improve the rock bolting performances especially in the rock masses where the high energy absorption capacity property is needed, like those with rock bursting, squeezing and swelling problems.

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Section: Discussionmentioning

confidence: 81%

Investigation of New Energy Absorbing Mechanisms Used to Fix Rock Bolt Plates

Komurlu

2023

Period. Polytech. Civil Eng.

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“…This indicates that the overall deformation performance of quasi-NPR steel under dynamic impact is better than that of conventional anchors. As shown in Figure 12b, the results from the Hopkinson pressure bar experiment show (Sui et al, 2022) that the quasi-NPR steel also exhibits excellent elongation performance at different Hopkinson's barometric values, with the highest elongation reaching about 30%. Under anchorage shear experimental conditions (He, Ren, et al, 2022), as shown in Figure 13, the added anchor joint rock exhibits significant ductile damage characteristics under shear loading, effectively improving the brittle damage phenomenon of unanchored joint rock.…”

Section: High Preload Materials (Npr Support Materials)mentioning

confidence: 90%

“…This ingenious design allows the NPR structure to undergo large deformations after reaching a constant resistance value and meanwhile prevents the PR material from failing and breaking within the yield strength range. This significantly enhances the strength properties of the PR material with extraordinary mechanical properties such as high constant resistance, large deformations, energy absorption, and impact and explosion resistance (He & Guo, 2014; He et al, 2016; He, Lyu, et al, 2018; He, Wang, et al, 2014; Sui et al, 2022). A schematic diagram of the physical model of a rock mass reinforced by NPR support is shown in Figure 10.…”

Section: The “Equipment” Of Excavation Compensation Theorymentioning

confidence: 99%

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Excavation compensation theory and supplementary technology system for large deformation disasters

Sui

Tao

2023

Deep Underground Science and Engineering

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Given the challenges in managing large deformation disasters in energy engineering, traffic tunnel engineering, and slope engineering, the excavation compensation theory has been proposed for large deformation disasters and the supplementary technology system is developed accordingly. This theory is based on the concept that "all destructive behaviors in tunnel engineering originate from excavation." This paper summarizes the development of the excavation compensation theory in five aspects: the "theory," "equipment," "technology," the design method with large deformation mechanics, and engineering applications. First, the calculation method for compensation force has been developed based on this theory, and a comprehensive large deformation disaster control theory system is formed. Second, a negative Poisson's ratio anchor cable with high preload, large deformation, and super energy absorption characteristics has been independently developed and applied to large deformation disaster control. An intelligent tunnel monitoring and early warning cloud platform system are established for remote monitoring and early warning system of Newton force in landslide geological hazards. Third, the double gradient advance grouting technology, the two-dimensional blasting technology, and the integrated Newton force monitoring--early warning--control technology are developed for different engineering environments. Finally, some applications of this theory in China's energy, traffic tunnels, landslide, and other field projects have been analyzed, which successfully demonstrates the capability of this theory in large deformation disaster control.

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