instrumented rock bolts using method

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  • 'DESIGN METHODS FOR ROCK BOLTS USING IN

    Strain measurements were obtained using rock bolts instrumented with optical fibers that possessed high spatial resolution ( 1.25 – 2.5 mm). Corroboration with a past database of rock bolt measurements in shale aided in the deduction of the final support design method.

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  • DESIGN METHODS FOR ROCK BOLTS USING IN

    Strain measurements were obtained using rock bolts instrumented with optical fibers that possessed high spatial resolution ( 1.25 – 2.5 mm). Corroboration with a past database of rock bolt measurements in shale aided in the deduction of the final support design method.

    Get Price
  • The Design of Improved Optical Fibre Instrumented ...

    2020-3-7 · Instrumented rock bolts can be used to evaluate the rock bolt performance in situ by measuring the amount of strain the rock bolt is undergoing. Instrumented rock bolts with strain gauges were first used by Sawyer and Karabin ( 1975 ) to measure strain in rock bolts.

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  • A new method for measuring in situ strain in intact rock ...

    2012-4-11 · Rock bolts and other ground control methods in mines are often monitored for effectiveness. However, monitoring tests are often destructive (e.g. pull-out tests) or do not adequately measure strain at a useful resolution (e.g. instrumented rock bolts) [1, 2, 3]. Thus, there is an apparent need for new methods to monitor in situstrain.

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  • Case Studies of Cable Bolts Using Instrumented King Wires

    2012-8-30 · between the cable-grout-rock interface can be compar­ ed to actual rock deformation. Results of Measurements on Instrumented King Wire Cable Bolts Loads on the cable bolts were measured from April 29 through July 11, 1999. Mining activities influencing the intersection were progressing from northeast of the site to the south (figure 4).

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  • [PDF] Application of a FBG-Based Instrumented

    Rock bolts have been widely applied with roadway excavation in underground coal mines to prevent roadway collapse and improve the stability of roadway surrounding rocks. Overloading and failures of rock bolts could result in accidents or casualties in coal mine roadways. Consequently, monitoring axial forces and work conditions of rock bolts plays an increasingly important role in ensuring ...

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  • Instrumented rock bolt, data logger and user

    A method for acquiring strain data relating to the strain of a rock mass in an underground mine, the method comprising: sampling one or more strain gauges with a data logger and recording multiple strain signals from each strain gauge of the one or more strain gauges in memory of the data logger, the strain signals corresponding to the strain of the rock mass over a period of time; providing one or more …

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  • Grouted Rock Bolting Procedure

    2020-6-7 · Spang and Egger (1990) modelled fully grouted rock bolts installed across rough joints using the Finite Element Method (FEM). They used Von-Mises failure criteria for rock, grout and steel. The bolt-grout de-bonding behaviour was simulated by using a low Young’s Modulus. Grasselli (2005) used FEM software to simulate the double shear test.

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  • Analysis of the Combined Load Behaviour of Rock

    2018-3-9 · Instrumented rock bolt data has been taken for validation of the model from field observation. It has been observed in the model that maximum axial …

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  • 'DESIGN METHODS FOR ROCK BOLTS USING IN

    Strain measurements were obtained using rock bolts instrumented with optical fibers that possessed high spatial resolution ( 1.25 – 2.5 mm). Corroboration with a past database of rock bolt measurements in shale aided in the deduction of the final support design method.

    Get Price
  • Instrumented Rockbolts - Earth Sciences

    A method for acquiring strain data relating to the strain of a rock mass in an underground mine, the method comprising: sampling one or more strain gauges with a data logger and recording multiple strain signals from each strain gauge of the one or more strain gauges in memory of the data logger, the strain signals corresponding to the strain ...

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  • Instrumented rock bolt, data logger and user

    Rock bolts have been widely applied with roadway excavation in underground coal mines to prevent roadway collapse and improve the stability of roadway surrounding rocks. Overloading and failures of rock bolts could result in accidents or casualties in coal mine roadways. Consequently, monitoring axial forces and work conditions of rock bolts plays an increasingly important role in ensuring ...

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  • d-REBAR Instrumented Rock Bolt - Earth Sciences

    2018-3-9 · Simulation, full column grout rock bolts, instrumented rock bolt. 1. Introduction . Presently, the trend of Indian underground coal mine is going into mechanization using continuous miner technology in Bord and Pillar working. The machine has operated in wider . 351

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  • Application of a FBG-Based Instrumented Rock Bolt

    2012-8-30 · between the cable-grout-rock interface can be compar­ ed to actual rock deformation. Results of Measurements on Instrumented King Wire Cable Bolts Loads on the cable bolts were measured from April 29 through July 11, 1999. Mining activities influencing the intersection were progressing from northeast of the site to the south (figure 4).

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  • Support Design during Depillaring Operation in Bord and ...

    Instrumented cable bolts developed at the Spokane Research Laboratory of the National Institute for Occupational Safety and Health were used in conjunction with existing ground control to monitor rock mass loads at various field sites (FMC Granger, Getchell, Meikle, SSX, K-2, and Stillwater).

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  • Case Studies of Cable Bolts Using Instrumented King Wires

    2020-10-13 · grouted rock bolts of 2.4 m with wire mesh. Load induced over instrumented rock bolts in immediate roof was also measured during the different stages of development. Considering the geo-mining condition of the Panel V, numerical modelling was done to understand the loading characteristics of the rock bolts using FLAC3D tool.

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  • Case Studies of Cable Bolts Using Instrumented

    2020-2-24 · rock bolts. In-situ monitoring of rock bolt deformation under bedding ... be used to separate the coaxial strain and lateral strain using the method in [4]. A 3D strain profile is the result. Using ... This involved feeding the DOS instrumented rock bolt into the bolt hole using a bolting rig, tensioning the bolt (Using …

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  • 'DESIGN METHODS FOR ROCK BOLTS USING IN-SITU

    Strain measurements were obtained using rock bolts instrumented with optical fibers that possessed high spatial resolution ( 1.25 – 2.5 mm). Corroboration with a past database of rock bolt measurements in shale aided in the deduction of the final support design method.

    Get Price
  • Case Studies of Cable Bolts Using Instrumented King Wires

    2012-8-30 · between the cable-grout-rock interface can be compar­ ed to actual rock deformation. Results of Measurements on Instrumented King Wire Cable Bolts Loads on the cable bolts were measured from April 29 through July 11, 1999. Mining activities influencing the intersection were progressing from northeast of the site to the south (figure 4).

    Get Price
  • [PDF] Application of a FBG-Based Instrumented Rock

    Rock bolts have been widely applied with roadway excavation in underground coal mines to prevent roadway collapse and improve the stability of roadway surrounding rocks. Overloading and failures of rock bolts could result in accidents or casualties in coal mine roadways. Consequently, monitoring axial forces and work conditions of rock bolts plays an increasingly important role in ensuring ...

    Get Price
  • Paper: Mechanisms of rockbolt support in jointed rock

    2017-11-6 · ABSRACT: One of the major problems associated with the use of fully grouted cable bolts is the lack of a reliable method to monitor the tension that develops in response to rock mass displacements. Existing gauges are mounted external to the cable itself and therefore potentially interfere with the bond strength in the measurement area.

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  • Grouted Rock Bolting Procedure

    rock. The bolts were installed using cement (water to cement ratio 0.36) as grouting material. The embedded anchorage ... installation of the bolts. Simulation studies were done using a finite difference method to analyze the redistribution of mining ... this purpose bolts were instrumented, in …

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  • THE S.M.A.R. T. CABLE BOLT: AN INSTRUMENT FOR THE ...

    Roof bolts are the dominant method of ground support in mining and tunneling applications, and the concept of using drilling parameters from the bolter for ground characterization has been studied for a few decades. This refers to the use of drilling data to identify geological features in the ground including joints and voids, as well as rock classification.

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  • Instrumentation for ground support design ...

    Ground reinforcement using bolts is effective for underground excavations. The ground response of expansive loess tunnels with bolt reinforcement remains poorly understood. Therefore, this paper proposes an analytical solution for bolted rock in expansive ground using the convergence-confinement method.

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  • Paper: Mechanisms of rockbolt support in jointed rock

    2012-8-30 · between the cable-grout-rock interface can be compar­ ed to actual rock deformation. Results of Measurements on Instrumented King Wire Cable Bolts Loads on the cable bolts were measured from April 29 through July 11, 1999. Mining activities influencing the intersection were progressing from northeast of the site to the south (figure 4).

    Get Price
  • Case Studies of Cable Bolts Using Instrumented King Wires

    Strain measurements were obtained using rock bolts instrumented with optical fibers that possessed high spatial resolution ( 1.25 – 2.5 mm). Corroboration with a past database of rock bolt measurements in shale aided in the deduction of the final support design method.

    Get Price
  • 'DESIGN METHODS FOR ROCK BOLTS USING IN-SITU

    Ground reinforcement using bolts is effective for underground excavations. The ground response of expansive loess tunnels with bolt reinforcement remains poorly understood. Therefore, this paper proposes an analytical solution for bolted rock in expansive ground using the convergence-confinement method.

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  • Analytical Solution for Bolted Tunnels in Expansive

    Rock bolts have been widely applied with roadway excavation in underground coal mines to prevent roadway collapse and improve the stability of roadway surrounding rocks. Overloading and failures of rock bolts could result in accidents or casualties in coal mine roadways. Consequently, monitoring axial forces and work conditions of rock bolts plays an increasingly important role in ensuring ...

    Get Price
  • [PDF] Application of a FBG-Based Instrumented Rock

    2012-8-30 · between the cable-grout-rock interface can be compared to actual rock deformation. Results of Measurements on Instrumented King Wire Cable Bolts Loads on the cable bolts were measured from April 29 through July 11, 1999. Mining activities influencing the inter-section were progressing from northeast of the site to the south (figure 4).

    Get Price
  • Field Tests of Cable Bolts Using Instrumented King Wires

    2017-11-6 · ABSRACT: One of the major problems associated with the use of fully grouted cable bolts is the lack of a reliable method to monitor the tension that develops in response to rock mass displacements. Existing gauges are mounted external to the cable itself and therefore potentially interfere with the bond strength in the measurement area.

    Get Price
  • THE S.M.A.R. T. CABLE BOLT: AN INSTRUMENT FOR THE ...

    rock bolts with different grooves and analyzed the full tensile load-displacement curves of rock bolts with different groove shapes. The influence of groove shape on bolt strength was discussed. The stress redistribution of different groove sec-tions in the rock bolts was simulated by using a finite element analysis program ANSYS.

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  • Monitoring and correction of the stress in an anchor bolt ...

    2020-10-13 · : A practical method for the estimation of roof bolt axial loads in the field as a means for evaluating rock support performance in underground mine openings such as drifts and gate roads is presented. The method is based on attaching an instrumented coupler to the bolt head prior to …

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  • Numerical Modelling of Fully Grouted Rock Bolts using a

    2020-9-13 · Numerical Modelling of Fully Grouted Rock Bolts using a 2D Finite Element Method Ya Su College of Civil Engineering – Hunan University, Changsha, Hunan, China & Department of Geological Sciences and Geological Engineering – Queen’s University, …

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  • Evaluation of Instrumented Cable and Rebar Bolts as

    2012-8-29 · cables were loaded to 180 kN using hydraulic pull test equipment. A strain-to-load curve is shown in figure 3 and is typical of what Goris et al. (1994) observed in pull tests with conventional cable bolts. These tests aid in explaining how load on cable bolts is transferred from the cable to the grout and then into the rock mass.

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  • Rock bolt | mining | Britannica

    Resin bolts provide the biggest cause for concern. Tests to determine the integrity of rock bolt installations are being developed. A new type of bolt is described which provides anchorage on installation and allows for follow-up checks when required.

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  • New method allows for anchorage check for rock

    2015-6-1 · ther discussed by (Taube & Olsson, 2013). Cracking of the inner lining as an indirect method for inspection of the primary strengthening is discussed, e.g. due to displacements of the rock bolts or from falling blocks of rock. A similar inner lining system is planned to be used for the Stockholm Bypass project, an 18 km long road tunnel.

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  • 1. Introduction rock bolts rock strengthening rock

    Health monitoring of rock bolts can indirectly indicate the state of rock which is crucial for mining safety. This paper presents an innovative application of the Self-excited Acoustical System SAS for stress change measurement in rock bolts which are used to secure roofs and walls in mines and tunnels. The method gives information on the change of rock stress in the immediate area next to the ...

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  • Rock Bolts Health Monitoring Using Self-Excited

    2016-7-11 · 3 The Cavimeter method The rock mass can be reinforced by using rock bolts. Rock reinforcement by means of cement- grouted rock bolts starts by drilling a hole in the rock. Cement slurry is then pumped into the borehole and a rock bolt is inserted. The bolt can be anchored in the bottom of the borehole, using a wedge or expander, before it is

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  • Sensor techniques to monitor ... - Rock Safety Systems

    2014-12-9 · the room and pillar extraction method and the other used the longwall extraction method. Mine sites Three underground coal mines were selected for the project. The sites needed to have similar immediate rock lithology, and mine management needed to provide the equipment and labour to carefully install the expensive instrumented bolts

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  • In situ monitoring of primary roofbolts at underground ...

    2019-5-2 · and rock are shear. Various types of failure can occur using grouted bolts. Failure can take place in the bolt, the grout, the rock, the bolt-grout interface, or the grout­ rock interface. The type of failure de­ pends on the chalacteristics of t he sys­ tem and the material properties of the individual elements.

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  • Linear Load-Transfer Mechanics of Fully Grouted Roof Bolts

    Area of Research: Rock Mechanics. Anupal Jyoti Dutta Area of Research: Petroleum Geology. Subhadip Maiti Area of Research: Oil & Gas upstream, Annular Pressure buildup, geothermal energy. Nimesh Nirbhay Area of Research: Behaviour of instrumented rock bolts. Pradeep Kumar Area of Research: Design of stope with paste back filling in underground ...

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