Modelling Rock Mass Improvement Using Rock Bolts

Pruška, Jan

doi:10.14311/app.2017.10.0043

Cited by 2 publications

(2 citation statements)

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“…Anchors, being a technique to provide stability of stopes, are used worldwide in ore mines, nonmetallic mines, and coal mines (Windsor, 1997;Wen, 2010;Li, 2012;Wen, Jiang, Han, Yang, & Wang, 2016;Ghadimi, 2017;Pruška, 2017). Different mining and geological conditions of their use stipulated the development of a number of anchoring designs.…”

Section: Introductionmentioning

confidence: 99%

Studies of new nonadhesive anchoring

Sakhno¹,

Sakhno²,

Kurdiumow³

et al. 2018

Min. miner. depos.

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Purpose is to develop anchoring with nonadhesive high-strength roof bolting in terms of large pre-destructive deformations and its testing under laboratory conditions.Methods. Laboratory studies of hydration hardening of self-extending mixtures, carried out with the use of digital microscope Bresser LCD 40-1600x, have determined the features of hydration of the modified mixtures. The developed mixture, testing by means of unevenly-component three-axial pressure (UCTAP), has determined its strength within post-hydration period, elasticity module, and deformation module. Bench tests concerning anchor fastening by means of self-expending mixtures as well as anchor glue Cement KL have helped perform comparative analysis of adhesive technique to hold anchors fixed and nonadhesive one. Underground on-site research to fasten anchors while Franciszek Karol chamber strengthening in the context of Wieliczka mine made it possible to determine dynamics of anchor loading.Findings. It has been grounded experimentally that adding of Sika BV 3M ingredient to self-extending mixture results in up to 30% intensification of its strength limit on uniaxial compression. It has also been grounded experimentally that maximum effort to fasten anchor bolts by means of self-extending mixtures, excesses efforts for those bolts fastened with the help of resins more than twice. Analysis of operation mode of such anchors means that the action of anchor -fastener -rock system is close to that by modern energy absorbing bolts. Originality.A new concept of anchor fixation at the expense of their fastening by means of self-extending mixtures throughout the hole length has been formulated. During the hardening process, 30 -50 MPa pressure is developed making it possible to intensify maximum fastening effort being more than two times higher to compare with adhesive technique. Moreover, constant resistance is provided in the process of the anchor bolts displacement within a hole; the resistance is similar to that provided by adhesive technique. Practical implications.The obtained results, having sufficient practical accuracy, can be used for the development of new anchoring in the context of large deformations of a stope boundary. If the parameters are substantiated theoretically and bench testing is passed, the proposed anchoring technique can be implemented in the stopes of coal mines, ore mines as well as nonmetallic ones. That favours the increase in load bearing capacity of the anchorage and rock support in terms of their elastic deformation.

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Section: Introductionmentioning

confidence: 99%

Studies of new nonadhesive anchoring

Sakhno¹,

Sakhno²,

Kurdiumow³

et al. 2018

Min. miner. depos.

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“…Scientific research works on study of the stability of mining roadways, fixed with this type of bolts, mostly fails to into account the influence of the adhesion of binding mixtures with the bolt rod and the rock mass while the loading transfer. Contemporary studies, conducted mathematically, mainly by numerical methods, suggest the existence of a close connection between the bolt's body and the rock block (Pruška 2017;Zesheng at al. 2016).…”

Section: Introductionmentioning

confidence: 99%

Influence of adhesion on stress-strain condition alongside of a full column resin cartridge rock bolt

Sheptak¹,

Sakhno²,

Korzeniowski³

et al. 2021

Mining Scince

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The article highlights the research pertaining to the problem of reinforcement of underground excavations with bolting system, using chemical method based on resin cartridges, which currently is a global trend in mines. Theoretical model of rock bolt installed in a rockmass was discussed and described with proper formulas for explanation the role of single discontinuity and its mechanism affecting stress-strain characteristics of the reinforcement system, based on an adhesive method. The presented model has been verified with results of numerical modelling of stress-strain and deformation composition of the "rock bolt/resin cartridge/rock block" system, depending on the bond coefficient of the mixture which fixes the rock bolt. The analysis of the modelling results showed that for the stress-strain conditions of the rock bolt, too high a bond between the bolt and the rock is dangerous (critical), as it leads to high local tensile and deformation stresses.

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Modelling Rock Mass Improvement Using Rock Bolts

Cited by 2 publications

References 0 publications

Studies of new nonadhesive anchoring

Studies of new nonadhesive anchoring

Influence of adhesion on stress-strain condition alongside of a full column resin cartridge rock bolt

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