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  • Development of a New Yielding Rock Bolt - Yield-Lok Bolt ...

    2010-6-27u2002·u2002Rock burst is one of the greatest challenges to ground control in the mining industry. There are more and more industry requirements on yielding rock support. Since 2008, Jennmar has been conducting large scale research and development works to develop a technically reliable and cost effective yielding rock bolt.

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  • Controlled Yielding Rock Bolt.

    Controlled Yielding Rock Bolt. The patent relates to a bolt assembly for supporting a mine roof or the like having a yieldable coupling means at least at one end to allow controlled sagging of the rock to prevent exceeding the elastic limit of the bolt. An …

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  • Swellex Rock Bolts, Swellex Bolts -ZongXiang

    The bolt is expanded inside the borehole drilled into the excavation wall. The installation process is easy and very similar to other rock bolt installation processes, making Swellex rock bolts accessible to all operators. Classifications: Premium line: The Premium line is a typical tunnelling bolt, with a high yield load and good deformability.

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  • DSI New Developments in Yieldable Rock Bolts

    2019-12-12u2002·u20021 DSI New Developments in Yieldable Rock Bolts 2012 Dynamic Ground Support Application Symposium Thursday, September 13th, 2012 Renn Oler, Engineering Director Dywidag Systems International (DSI) Underground Sys Inc.

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  • Development of a new yielding rock bolt - Yield-lok bolt

    This paper introduces a new yielding rock support - Yield-Lok bolt. The bolt is characterized by the designed yielding ability to produce 150-250mm of deflection at 8-10 metric tons (Mt) loads for ...

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  • Adjustment of the Yielding System of Mechanical Rock Bolts ...

    The article presents a novel yielding mechanism, especially designed for the rock bolt support. Mechanical rock bolts with an expansion head and equipped with one, two, four and six dome bearing plates were tested in the laboratory conditions. Furthermore, in the Phase2D numerical program, five room and pillar widths were modeled. The main aim of numerical modeling was to …

    Get Price
  • High capacity yielding bolt support for rockburst prone ...

    yielding support system to facilitate absorption and controlled deformation of rock mass while containing materials, or helping the rock mass to support itself. Jennmar research and development has resulted in a technically reliable and effective yielding rockbolt. The first generation Yield-Lok bolt accepted 150–250 mm

    Get Price
  • Professor's modified rock bolt design contributes to

    2018-6-20u2002·u2002criteria for the design of a new yielding rock bolt, including static strength, yielding capacity, ease of manufacture and installation, and cost. Students took up the design challenge. They began with several different designs, and,in a brainstorming session one …

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  • ROCK BOLTS TESTING UNDER DYNAMIC CONDITIONS AT

    2009-10-15u2002·u2002ROCK BOLTS TESTING UNDER DYNAMIC CONDITIONS AT CANMET-MMSL Michel Plouffe, Ted Anderson and Ken Judge ... when selecting yielding elements for highly stressed, burst-prone or high deformation environments. Moreover, the influence of parameters such as hole diameter, environmental ... repeatable and cost-effective

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  • Performance of a New Yielding Rock Bolt Under Pull and ...

    2019-3-11u2002·u2002High stress in surrounding rock mass could cause serious stability problems such as larger squeezing deformation in soft rock and rock burst in hard rock. The support system applied in high in situ stress conditions should be able to carry high load and accommodate large deformation of rock mass. This paper presented a new yielding rock bolt, called tension and …

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  • DSI New Developments in Yieldable Rock Bolts

    2019-12-12u2002·u2002DSI New Developments in Yieldable Rock Bolts ... • Reduce Costs to the Mines ... DSI Dynatork Bolt – Dynamic Yielding Solution 16 Dynamic Bolt Energy Absorption 15 kJ Tested 23 kJ Tested 30 kJ tested 1055 Modified Steel Elongation 10% Yield Strength 560 MPa 81,200 psi

    Get Price
  • Swellex Rock Bolts, Swellex Bolts -ZongXiang

    The bolt is expanded inside the borehole drilled into the excavation wall. The installation process is easy and very similar to other rock bolt installation processes, making Swellex rock bolts accessible to all operators. Classifications: Premium line: The Premium line is a typical tunnelling bolt, with a high yield load and good deformability.

    Get Price
  • YIELDABLE ROCK BOLTS FOR SHOCK LOADING AND

    yielding bolts were tested with conventional ones in a suitable test drift, using controlled peripheral blasting to cause large, high-velocity desplacements characteristic of rock bursts. decoupled explosives were detonated simultaneously in long axial holes spaced around the periphery of the tunnel.

    Get Price
  • Adjustment of the Yielding System of Mechanical Rock

    The article presents a novel yielding mechanism, especially designed for the rock bolt support. Mechanical rock bolts with an expansion head and equipped with one, two, four and six dome bearing plates were tested in the laboratory conditions. Furthermore, in the Phase2D numerical program, five room and pillar widths were modeled. The main aim of numerical modeling was to determine the …

    Get Price
  • ROCK BOLTS TESTING UNDER DYNAMIC CONDITIONS

    2009-10-15u2002·u2002ROCK BOLTS TESTING UNDER DYNAMIC CONDITIONS AT CANMET-MMSL Michel Plouffe, Ted Anderson and Ken Judge ... when selecting yielding elements for highly stressed, burst-prone or high deformation environments. Moreover, the influence of parameters such as hole diameter, environmental ... repeatable and cost-effective

    Get Price
  • High capacity yielding bolt support for rockburst prone ...

    yielding support system to facilitate absorption and controlled deformation of rock mass while containing materials, or helping the rock mass to support itself. Jennmar research and development has resulted in a technically reliable and effective yielding rockbolt. The first generation Yield-Lok bolt …

    Get Price
  • Swellex Rock Bolting System

    2021-9-29u2002·u2002Rock bolts. Since its introduction 30 years ago the Swellex expandable rock-bolting system has gained wide recognition in the mining and tunneling industry. This unique rock bolt consists of a welded tube folded in upon itself, sealed at one end. It is re-expanded using a high pressure water flow provided by a special pump and adapter.

    Get Price
  • Case Studies - DSI Underground Group

    DSI Rock Bolts secure Tunnel for Mölltaler Glacier Express …. The world's longest underground cable railway (length 4,796 m)…. 1. 2. >. >>.

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  • PDF Laboratory Studies Of Yielding Rock Bolts Download ...

    An Evaluation of the Design and Applications of Yieldable Rock Bolts An Evaluation of the Design and Applications of Yieldable Rock Bolts 1976 1976 Wendell O. Miller Wendell O. Miller BIBLIOGRAPHY Conway, J. P., et al ., ' Laboratory Studies of Yielding Rock Bolts, ' Report of Investigation 8058, 1975, U. S. Bureau of Mines ...

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  • Advances in Mechanical Engineering 2017, Vol. 9(5) 1–18 ...

    2016-3-25u2002·u2002of the rock bolts and takes into consideration the shear stress on the bolt surface, which opposes the rock mass displacements near the tunnel wall. The diameter of grouted rock bolts is d and the tunnel radius is a. l0 is the friction factor which is analogous to the coefficient of friction. The number of the grouted rock bolts is presumably

    Get Price
  • Adjustment of the Yielding System of Mechanical Rock

    The article presents a novel yielding mechanism, especially designed for the rock bolt support. Mechanical rock bolts with an expansion head and equipped with one, two, four and six dome bearing plates were tested in the laboratory conditions. Furthermore, in the Phase2D numerical program, five room and pillar widths were modeled. The main aim of numerical modeling was to determine the …

    Get Price
  • ROCK BOLTS TESTING UNDER DYNAMIC CONDITIONS

    2009-10-15u2002·u2002ROCK BOLTS TESTING UNDER DYNAMIC CONDITIONS AT CANMET-MMSL Michel Plouffe, Ted Anderson and Ken Judge ... when selecting yielding elements for highly stressed, burst-prone or high deformation environments. Moreover, the influence of parameters such as hole diameter, environmental ... repeatable and cost-effective

    Get Price
  • World's leading rock bolt manufacturer-Sinorock®

    Sinorock® is an experienced rock bolt system manufacturer,which has some authority certifications,such as ISO, SGS,Bureau and CE.These rock bolt products are mostly used for the mining,tunneling and civil construction industries etc.

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  • Secoroc Rock Drilling Tools SWELLEX ROCK BOLTS

    2016-10-20u2002·u2002available with Swellex rock bolts has made them the best for solving most problems and one of the best in for Rock Reinforcement in general. Special application products From the well accepted Plastic coating for highly corrosive environments, Atlas Copco covers all demands for corro-sion protection and long life rock bolts. For special applica-

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  • NIOSHTIC-2 Publications Search - 10001055 - Yielding

    The yielding rockbolt was originally developed in South Africa to overcome the limitations of conventional bolting in rock subjected to high-stress or rock burst conditions. The yielding effect is obtained by fitting the bolt prior to thread rolling with a smooth-bore die of internal diameter slightly larger than the shank diameter but smaller ...

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  • Improved Safety Equipment for the Mining Industry: a New ...

    2021-10-8u2002·u2002This project is focused on improving mining safety through newly developed yielding rock bolts. Extensive testing work and mechanistic study will be carried out to optimize the design of the new product. Predictive models will be developed to describe the performance of the product during occurrence of rock bursts. The industrial partner will benefit significantly from the project with ...

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  • Laboratory Studies Of Yielding Rock Bolts ebook PDF ...

    Laboratory Studies Of Yielding Rock Bolts. Download and Read online Laboratory Studies Of Yielding Rock Bolts ebooks in PDF, epub, Tuebl Mobi, Kindle Book. Get Free Laboratory Studies Of Yielding Rock Bolts Textbook and unlimited access to our library by created an …

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  • PDF Laboratory Studies Of Yielding Rock Bolts Download ...

    An Evaluation of the Design and Applications of Yieldable Rock Bolts An Evaluation of the Design and Applications of Yieldable Rock Bolts 1976 1976 Wendell O. Miller Wendell O. Miller BIBLIOGRAPHY Conway, J. P., et al ., ' Laboratory Studies of Yielding Rock Bolts, ' Report of Investigation 8058, 1975, U. S. Bureau of Mines ...

    Get Price
  • The Effect of Earthquake Acceleration on the Yielding of ...

    2016-11-5u2002·u2002earthquake acceleration on the yielding of rock bolts in the tunnels is evaluated. The circular tunnels are modeled in depths of 10, 25 and 35 meters in the shale rocks. The tunnels are supported by end anchored rock bolts with length of 3 meters and spacing …

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  • Advances in Mechanical Engineering 2017, Vol. 9(5) 1–18 ...

    2016-3-25u2002·u2002of the rock bolts and takes into consideration the shear stress on the bolt surface, which opposes the rock mass displacements near the tunnel wall. The diameter of grouted rock bolts is d and the tunnel radius is a. l0 is the friction factor which is analogous to the coefficient of friction. The number of the grouted rock bolts is presumably

    Get Price
  • DSI New Developments in Yieldable Rock Bolts

    2019-12-12u2002·u2002DSI New Developments in Yieldable Rock Bolts ... • Reduce Costs to the Mines ... DSI Dynatork Bolt – Dynamic Yielding Solution 16 Dynamic Bolt Energy Absorption 15 kJ Tested 23 kJ Tested 30 kJ tested 1055 Modified Steel Elongation 10% Yield Strength 560 MPa 81,200 psi

    Get Price
  • Swellex Rock Bolts, Swellex Bolts -ZongXiang

    The bolt is expanded inside the borehole drilled into the excavation wall. The installation process is easy and very similar to other rock bolt installation processes, making Swellex rock bolts accessible to all operators. Classifications: Premium line: The Premium line is a typical tunnelling bolt, with a high yield load and good deformability.

    Get Price
  • YIELDABLE ROCK BOLTS FOR SHOCK LOADING AND

    yielding bolts were tested with conventional ones in a suitable test drift, using controlled peripheral blasting to cause large, high-velocity desplacements characteristic of rock bursts. decoupled explosives were detonated simultaneously in long axial holes spaced around the periphery of the tunnel.

    Get Price
  • Adjustment of the Yielding System of Mechanical Rock

    The article presents a novel yielding mechanism, especially designed for the rock bolt support. Mechanical rock bolts with an expansion head and equipped with one, two, four and six dome bearing plates were tested in the laboratory conditions. Furthermore, in the Phase2D numerical program, five room and pillar widths were modeled. The main aim of numerical modeling was to determine the …

    Get Price
  • ROCK BOLTS TESTING UNDER DYNAMIC CONDITIONS

    2009-10-15u2002·u2002ROCK BOLTS TESTING UNDER DYNAMIC CONDITIONS AT CANMET-MMSL Michel Plouffe, Ted Anderson and Ken Judge ... when selecting yielding elements for highly stressed, burst-prone or high deformation environments. Moreover, the influence of parameters such as hole diameter, environmental ... repeatable and cost-effective

    Get Price
  • High capacity yielding bolt support for rockburst prone ...

    yielding support system to facilitate absorption and controlled deformation of rock mass while containing materials, or helping the rock mass to support itself. Jennmar research and development has resulted in a technically reliable and effective yielding rockbolt. The first generation Yield-Lok bolt …

    Get Price
  • Swellex Rock Bolting System

    2021-9-29u2002·u2002Rock bolts. Since its introduction 30 years ago the Swellex expandable rock-bolting system has gained wide recognition in the mining and tunneling industry. This unique rock bolt consists of a welded tube folded in upon itself, sealed at one end. It is re-expanded using a high pressure water flow provided by a special pump and adapter.

    Get Price
  • Case Studies - DSI Underground Group

    DSI Rock Bolts secure Tunnel for Mölltaler Glacier Express …. The world's longest underground cable railway (length 4,796 m)…. 1. 2. >. >>.

    Get Price
  • PDF Laboratory Studies Of Yielding Rock Bolts Download ...

    An Evaluation of the Design and Applications of Yieldable Rock Bolts An Evaluation of the Design and Applications of Yieldable Rock Bolts 1976 1976 Wendell O. Miller Wendell O. Miller BIBLIOGRAPHY Conway, J. P., et al ., ' Laboratory Studies of Yielding Rock Bolts, ' Report of Investigation 8058, 1975, U. S. Bureau of Mines ...

    Get Price
  • Advances in Mechanical Engineering 2017, Vol. 9(5) 1–18 ...

    2016-3-25u2002·u2002of the rock bolts and takes into consideration the shear stress on the bolt surface, which opposes the rock mass displacements near the tunnel wall. The diameter of grouted rock bolts is d and the tunnel radius is a. l0 is the friction factor which is analogous to the coefficient of friction. The number of the grouted rock bolts is presumably

    Get Price
  • phqglobal

    Skema Friction Rock Stabilizers design allows bolts to tighten should lateral rock displacement occur, enhancing yielding capabilities.. Manufacturing - A hollow tube slit lengthwise. Tapered on one end and a welded ring at the other to hold the plate. A square plate is used to stabilize the shaft and hold it in place, as well as retaining wire screen against the rock …

    Get Price
  • DSI New Developments in Yieldable Rock Bolts

    2019-12-12u2002·u2002DSI New Developments in Yieldable Rock Bolts ... • Reduce Costs to the Mines ... DSI Dynatork Bolt – Dynamic Yielding Solution 16 Dynamic Bolt Energy Absorption 15 kJ Tested 23 kJ Tested 30 kJ tested 1055 Modified Steel Elongation 10% Yield Strength 560 MPa 81,200 psi

    Get Price
  • Adjustment of the Yielding System of Mechanical Rock

    The article presents a novel yielding mechanism, especially designed for the rock bolt support. Mechanical rock bolts with an expansion head and equipped with one, two, four and six dome bearing plates were tested in the laboratory conditions. Furthermore, in the Phase2D numerical program, five room and pillar widths were modeled. The main aim of numerical modeling was to determine the …

    Get Price
  • Adjustment of the Yielding System of Mechanical Rock

    Downloadable! The article presents a novel yielding mechanism, especially designed for the rock bolt support. Mechanical rock bolts with an expansion head and equipped with one, two, four and six dome bearing plates were tested in the laboratory conditions. Furthermore, in the Phase2D numerical program, five room and pillar widths were modeled.

    Get Price
  • Analysis of Yielding Steel Arch Support with Rock Bolts in ...

    The result of the search for new technological solutions in the field of support for roadways in coal mines has in recent years been the widespread use of steel arch with rockbolt support systems. The efficiency of these systems is affected among other things by the option of installing rock bolts after the actual driving the mine roadway, the increased load capacity that these systems can ...

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  • A New Yielding Bolt for Rock Support in High Stress Rock ...

    High stress in the surrounding rock mass causes serious stability problems. The applied support system used in this conduction should be able to carry high loads and also accommodate large deformations without experiencing serious damage. In this paper, a brief overview of the history of yielding/energy-absorbing rock bolts is provided. And then, a new yielding bolt invented by the author is ...

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  • ANALYSIS OF SWELLEX BOLT PERFORMANCE

    2020-4-8u2002·u2002Standardized Rock Bolt Pull Test Database. Thanks also to Francois Charette and Mario Bureau of Atlas Copco Ltd. (the manufacturer of the Swellex bolt), for their assistance and for providing the background information regarding Swellex bolts and pull testing. I would also like to thank the

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  • Dynamic OMEGA-BOLT® - DSI Underground Canada

    The Dynamic OMEGA-BOLT ® is an evolution of the DSI Underground OMEGA-BOLT ® a high pressure inflatable friction bolt, used to secure a great variety of ground conditions, subjected to different stress conditions. All OMEGA-BOLT ® systems are based on a steel tube, longitudinally formed in its typical omega (Ω) shape and made pressure tight by welded bushings on each end.

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  • APPENDIX 3 STATE-OF-THE-ART AND PHYSICAL

    2012-11-18u2002·u2002second case, bolts would assist the rock structure in supporting itself; and in the third case, bolts would suspend failed rock from more competent rock located above. Four principles are involved when an underground opening is supported with rock bolts. …

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  • Tightening bolts to yield - is this bad? - Welding ...

    2018-7-16u2002·u2002When the bolt load is further increased and exceeds the yield point 'Y' the stiffness of the clamped plates has remained constant I.e. Line 'X' 'f' which is parallel to the original line 'O' 'J', however the stiffness of the bolt as changed and follows the line 'X' 'U', if you now consider the clamped plates trying to return towards their ...

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  • DSI New Developments in Yieldable Rock Bolts

    2019-12-12u2002·u2002DSI New Developments in Yieldable Rock Bolts ... • Reduce Costs to the Mines ... DSI Dynatork Bolt – Dynamic Yielding Solution 16 Dynamic Bolt Energy Absorption 15 kJ Tested 23 kJ Tested 30 kJ tested 1055 Modified Steel Elongation 10% Yield Strength 560 MPa 81,200 psi

    Get Price
  • Swellex Rock Bolts, Swellex Bolts -ZongXiang

    The bolt is expanded inside the borehole drilled into the excavation wall. The installation process is easy and very similar to other rock bolt installation processes, making Swellex rock bolts accessible to all operators. Classifications: Premium line: The Premium line is a typical tunnelling bolt, with a high yield load and good deformability.

    Get Price
  • YIELDABLE ROCK BOLTS FOR SHOCK LOADING AND

    yielding bolts were tested with conventional ones in a suitable test drift, using controlled peripheral blasting to cause large, high-velocity desplacements characteristic of rock bursts. decoupled explosives were detonated simultaneously in long axial holes spaced around the periphery of the tunnel.

    Get Price
  • Adjustment of the Yielding System of Mechanical Rock

    The article presents a novel yielding mechanism, especially designed for the rock bolt support. Mechanical rock bolts with an expansion head and equipped with one, two, four and six dome bearing plates were tested in the laboratory conditions. Furthermore, in the Phase2D numerical program, five room and pillar widths were modeled. The main aim of numerical modeling was to determine the …

    Get Price
  • ROCK BOLTS TESTING UNDER DYNAMIC CONDITIONS

    2009-10-15u2002·u2002ROCK BOLTS TESTING UNDER DYNAMIC CONDITIONS AT CANMET-MMSL Michel Plouffe, Ted Anderson and Ken Judge ... when selecting yielding elements for highly stressed, burst-prone or high deformation environments. Moreover, the influence of parameters such as hole diameter, environmental ... repeatable and cost-effective

    Get Price
  • High capacity yielding bolt support for rockburst prone ...

    yielding support system to facilitate absorption and controlled deformation of rock mass while containing materials, or helping the rock mass to support itself. Jennmar research and development has resulted in a technically reliable and effective yielding rockbolt. The first generation Yield-Lok bolt …

    Get Price
  • Swellex Rock Bolting System

    2021-9-29u2002·u2002Rock bolts. Since its introduction 30 years ago the Swellex expandable rock-bolting system has gained wide recognition in the mining and tunneling industry. This unique rock bolt consists of a welded tube folded in upon itself, sealed at one end. It is re-expanded using a high pressure water flow provided by a special pump and adapter.

    Get Price
  • Case Studies - DSI Underground Group

    DSI Rock Bolts secure Tunnel for Mölltaler Glacier Express …. The world's longest underground cable railway (length 4,796 m)…. 1. 2. >. >>.

    Get Price
  • PDF Laboratory Studies Of Yielding Rock Bolts Download ...

    An Evaluation of the Design and Applications of Yieldable Rock Bolts An Evaluation of the Design and Applications of Yieldable Rock Bolts 1976 1976 Wendell O. Miller Wendell O. Miller BIBLIOGRAPHY Conway, J. P., et al ., ' Laboratory Studies of Yielding Rock Bolts, ' Report of Investigation 8058, 1975, U. S. Bureau of Mines ...

    Get Price
  • Advances in Mechanical Engineering 2017, Vol. 9(5) 1–18 ...

    2016-3-25u2002·u2002of the rock bolts and takes into consideration the shear stress on the bolt surface, which opposes the rock mass displacements near the tunnel wall. The diameter of grouted rock bolts is d and the tunnel radius is a. l0 is the friction factor which is analogous to the coefficient of friction. The number of the grouted rock bolts is presumably

    Get Price