Development of a new deformation-controlled rockbolt: numerical modelling and laboratory verification

Yokota, Yasuhiro; Zhao, Zhiye; Nie, Wen; Date, Kensuke; Iwano, Kaoru; Koizumi, Yu; Okada, Yuko

doi:10.36487/acg_rep/1925_39_yokota

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…En consecuencia, recientemente se han desarrollado sistemas de soporte patentados que genéricamente se catalogan como pernos de anclaje diseñados específicamente para terrenos proclives al estallido de roca. Se caracterizan por poseer una alta capacidad de absorción de energía dinámica y un rendimiento constante ante periodos repetitivos de carga y descarga (Cai, Champaigne, Coulombe y Challagulla, 2019; Yokota et al, 2019).…”

Section: Estructuras Dinámicas De Soporteunclassified

Mitos y realidades de la minería aurífera en Colombia

Avila¹,

Suárez²,

González³

et al. 2020

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Mitos y realidades de la minería aurífera en Colombia ResumenDe la mano de expertos nacionales, este libro analiza nueve de los mitos en torno a este tema en el país, relacionados con temas ambientales, sociales, jurídicos y económicos y, desde ahí, el libro explora la bibliografía existente que se encuentra en revistas científicas indexadas, estudios internacionales, documentos oficiales, normatividad y jurisprudencia, y lo complementa con la revisión de estudios de impacto ambiental, entrevistas a funcionarios y visitas de campo a proyectos mineros. Se espera que este aporte de la academia sea una oportunidad para generar una discusión respetuosa, imparcial y crítica sobre los argumentos a favor y en contra de la minería de oro en el país, que sin duda será un referente fundamental para todos aquellos interesados en conocer más sobre este sector.

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Section: Estructuras Dinámicas De Soporteunclassified

Mitos y realidades de la minería aurífera en Colombia

Avila¹,

Suárez²,

González³

et al. 2020

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Evaluation of the performance of yielding rockbolts during rockbursts using numerical modeling method

Wang

Apel

et al. 2022

Int J Coal Sci Technol

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The assessment of yielding rockbolt performance during rockbursts with actual seismic loading is essential for rockburst supporting designs. In this paper, two types of yielding rockbolts (D-bolt and Roofex) and the fully resin-grouted rebar bolt are modeled via the “rockbolt” element in universal distinct element code (UDEC) after an exact calibration procedure. A two-dimensional (2D) model of a deep tunnel is built to fully evaluate the performance (e.g., capacity of energy-absorption and control of rock damage) of yielding and traditional rockbolts based on the simulated rockbursts. The influence of different rockburst magnitudes is also studied. The results suggest that the D-bolt can effectively control and mitigate rockburst damage during a weak rockburst because of its high strength and deformation capacity. The Roofex is too “soft” or “smooth” to limit the movement of ejected rocks and restrain the large deformation, although it has an excellent deformation capacity. The resin-grouted rebar bolt can maintain a high axial force level during rockbursts but is easy to break during dynamic shocks, which fails to control rapid rock bulking or ejection. Three types of rockbolts cannot control the large deformation and mitigate rockburst damage effectively during violent rockbursts. The rockburst damage severity can be significantly reduced by additional support with cable bolts. This study highlights the effectiveness of numerical modeling methods in assessing the complex performance of yielding rockbolts during rockbursts, which can provide some references to improve and optimize the design of rock supporting in burst-prone grounds.

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Evaluation of the Effects of Yielding Rockbolts on Controlling Self-Initiated Strainbursts: A Numerical Study

Wang

Apel

et al. 2022

Energies

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In this paper, a 2D distinct element method (DEM) model of a deep tunnel in an underground coal mine is built to thoroughly evaluate the effects of yielding (D-bolt and Roofex) and the traditional rockbolt (fully resin-grouted rebar) on controlling self-initiated strainbursts. The occurrence of self-initiated strainbursts is judged based on the stiffness difference between the loading system and rock masses for the first time. The results suggest that the total deformations of the tunnel supported with Roofex and resin-grouted rebar are 1.53 and 2.09 times that of D-bolts (1411 mm). The average velocities of detached rock blocks in the tunnel supported with Roofex and resin-grouted rebar are 3.22 and 3.97 m/s, respectively, which are much higher than that of D-bolts (0.34 m/s). 13 resin-grouted rebar bolts are broken during the strainburst, while D-bolts and Roofex survive. Compared with Roofex (295.16 kJ) and resin-grouted rebar (125.19 kJ), the D-bolt can reduce the most kinetic energy (469.30 kJ). D-bolt and resin-grouted rebar can maintain high axial force levels (214.87 and 151.05 kN) during strainbursts. Both Roofex and resin-grouted rebar fail to control strainbursts. The bolt number significantly influences the control effects of yielding rockbolts on strainbursts. 9 and 12 D-bolts cannot control the strainburst, while 15 and 18 D-bolts can make the tunnel stable. In addition, the detachment and ejection of rocks between rockbolts can be well restrained using surface retain elements, e.g., steel arch. This study highlights the usage of numerical modeling methods in assessing the performance of yielding rockbolts, which can be served as a promising tool to improve and optimize the design of rock supporting in burst-prone grounds.

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Development of a new deformation-controlled rockbolt: numerical modelling and laboratory verification

Cited by 3 publications

References 5 publications

Mitos y realidades de la minería aurífera en Colombia

Mitos y realidades de la minería aurífera en Colombia

Evaluation of the performance of yielding rockbolts during rockbursts using numerical modeling method

Evaluation of the Effects of Yielding Rockbolts on Controlling Self-Initiated Strainbursts: A Numerical Study

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