optimum rock bolt testing procedure

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  • (PDF) Standard Test Method for Rock Bolt Anchor Pull

    Load the bolt in ten equal downhole end of the rock bolt and screw on the anchor. When increments and unload it in ten equal decrements. in position, torque the bolt to the manufacturer’s recommended 7.4.3 Apply the load smoothly and rapidly. level to set the anchor.

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  • Grouted Rock Bolting Procedure - 911 Metallurgist

    5.5.1 Anchor pull tests should be conducted in all rock types in which construction bolts will be installed. If the rock is anisotropic, for example, bedded or schistose, the tests should be conducted in various orientations relative to the anisotropy, including those at which the construction bolt may be installed.

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  • ASTM D4435 - 13e1 Standard Test Method for Rock

    2021-1-22 · Procedure for Rock Bolt Rock Anchor Pull Out Test Test Procedure. The drill hole diameter is kept as double the diameter of the element. The standard specification follows up for hole drilling operations must be ensured. Inspect the hole for size and length. Clean the hole with air- water jet.

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  • Rock Bolt Anchor (Elements) in situ Pull Out Test 54 ...

    2018-9-21 · than the bolt otherwise the bail will be dislodged by being forced against the end of the hole. Once the assembly is in place, a sharp pull on the end of the bolt will seat the anchor. Tightening the bolt will force the cone further into the wedge thereby increasing the anchor force.

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  • Practical Rock Engineering Chapter 14 Rockbolts and

    2016-7-19 · a rock bolt or its anchor. 12.1.1 Fit the socket of the torque wrench to the rock bolt head or nut to be tested. 12.1.2 Apply a preset torque to the rock bolt or its anchor, increasing the torque in small increments until just sufficient to cause the face nut to rotate. Record the torque wrench reading, the date of test, and the rock

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  • Determining Rock Bolt or Anchor Tension Using a

    2012-8-29 · movement is at least equal to the yield strength of the bolt, is the total bolt length L minus the length of the anchor: LFR = L - LAnch CAUSES OF POOR RESIN BOLT ANCHORAGE The two most likely causes of poor anchorage are weak rock and poor installation. Weak Rock: Testing has consistently shown that weaker rock

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  • ANCHORAGE PULL TESTING FOR FULLY GROUTED ROOF

    2017-10-1 · The tests were conducted under either constant radial stiffness or constant confining pressure boundary conditions applied on the outer surface of the rock sample. In most tests, the rate of displacement was about 0.02 mm/s. The tests were performed using a pull-out bench that allows testing a wide range of parameters.

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  • Laboratory pull-out tests on fully grouted rock bolts

    1992-9-1 · Consequently, the majority of researchers have con- ducted tests on cable bolts in much the same manner as if they were testing rock bolts. This typically involves grouting a short section (usually 250 mm) of cable into a borehole, approx. 1-3 m away from the collar, and pulling on that portion of the cable that projects from the collar using a barrel and wedge grip.

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  • An experimental procedure for the in situ testing of

    2014-5-27 · appropriate plates for the size of bolt are installed. The bolt, nut and hardened washer are then installed through the central hole and tightened by whatever method is to be employed in the project (see photo at left for a bolt, nut and washer installed in the device, ready for testing).

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  • Rock Bolt Anchor (Elements) in situ Pull Out Test 54 ...

    2021-1-22 · Rock Bolt Anchor (Elements) in situ Pull Out Test (Method for Conducting Pull Out Test on Anchor Bars and Rock BoltsIS 11309 reaffirmed 2016) (The rock anchors are of various types and are manufactured by different agencies.The anchor pull-out test is done to get assistance in design and acceptance after installation.

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  • Practical Rock Engineering Chapter 14 Rockbolts and Cables

    2018-9-21 · between the bolt and the rock can be filled with cement or resin grout. Dowels or anchor bars generally consist of deformed steel bars which are grouted into the rock. Tensioning is not possible and the load in the dowels is generated by movements in the rock mass. In order to be effective, dowels have to be installed before

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  • Anchor Pull Testing - Applied Technical Services

    2018-11-14 · method for conducting pull-out test on anchor bars and rock bolts is a full-column-grouted rock bolt or bar with cement-sand grout or resin and rock bolt is ungrouted mechanically anchored bolt. The anchorage may be of any type that is lot wedge type, expansion shell type, etc.

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  • IS 11309 (1985): Method of conducting pull-out test on ...

    2017-10-1 · The set-up shown in Fig. 1 is completed with some additional parts when a cable bolt is tested. Indeed, it is well known that the process of unscrewing that occurs for short embedment lengths could distort the results of a laboratory pull-out test on a cable bolt (Bawden et al., 1992).In fact, as a consequence of their helical structure and low torsional rigidity, cable bolts may unscrew from ...

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  • Laboratory pull-out tests on fully grouted rock bolts

    2012-8-29 · the friction bolt past the ring and plate, and then a cone assembly was expanded. In stiff rock, the rock’s confining force kept the device from pushing the wall of the friction bolt apart. However, the measurement reading of the initial pull-out load was false. In softer rock, the expander would tear the bolt …

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  • Design and Testing of a Nondestructive Friction Bolt Tester

    Sandberg offers bolt testing using two tensometers to cover a wide range of loads as well as different test parameters. Range of bolt tests includes: UKAS accredited for ISO 6892 Tensile tests – Load range 0.1kN to 600kN. Tensile testing of full size and machined bolts. Head soundness test.

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  • Bolt Testing | Sandberg

    2014-5-27 · appropriate plates for the size of bolt are installed. The bolt, nut and hardened washer are then installed through the central hole and tightened by whatever method is to be employed in the project (see photo at left for a bolt, nut and washer installed in the device, ready for testing).

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  • Installation and Inspection of High Strength Bolts

    2014-12-10 · ii Abstract Evaluation and Design of Optimum Support Systems in South African Collieries Using the Probabilistic Design Approach by İsmet Canbulat Supervisor : Professor J.N. van der Merwe Co-supervisor : Professor M.F. Handley Department : Mining Engineering Name of degree : Philosophiae Doctor Keywords: Coal mine, roof support design, probabilistic design, roof stability, roof failure

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  • ROCK CORRECTION PROCEDURE FOR MAXIMUM DRY

    2018-5-18 · OPTIMUM MOISTURE CONTENT DETERMINATION (A Modification of AASHTO Designation T 99 - ANNEX) 1. SCOPE . 1.1 This procedure is used to determine the corrected maximum dry density and optimum moisture content for a sample of material when coarse aggregate or rock particles are retained on the No. 4 sieve (for Method A proctor) or 3/4 inch

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  • Anchor Pull Testing - Applied Technical Services

    Sandberg offers bolt testing using two tensometers to cover a wide range of loads as well as different test parameters. Range of bolt tests includes: UKAS accredited for ISO 6892 Tensile tests – Load range 0.1kN to 600kN. Tensile testing of full size and machined bolts. Head soundness test.

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  • Ultrasonic Testing of Anchor Bolts | FPrimeC Solutions

    Hardness testing devices that work according to the Rockwell procedure are the most widespread. The most important advantages are: deviations due to personal estimations are avoided; it is less sensitive to rough surfaces (even though the standard says that surfaces have to be flat and carefully abraded).

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  • Bolt Testing | Sandberg

    Only DSI Underground rock bolt components should be used to enable the optimum performance of the bolt system to be obtained. DSI Underground Mining Products Division is Quality Assured to ISO 9001:2015, Registration QMS 41328.

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  • Guidelines to hardness testing - Hegewald & Peschke

    2014-5-27 · appropriate plates for the size of bolt are installed. The bolt, nut and hardened washer are then installed through the central hole and tightened by whatever method is to be employed in the project (see photo at left for a bolt, nut and washer installed in the device, ready for testing).

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  • Cable Bolt Plain - DSI Underground Australia - Rock

    2017-2-28 · The pull test kit consists of two assemblies: a mechanical assembly which includes a claw, stand, nut, & spindle. a hydraulic assembly which includes a hollow core ram, hand pump, gauge, & hose. The gauge measures pressure, which is easily converted into tons of load. Suitable for testing virtually all types of rock bolts and soil nails.

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  • Installation and Inspection of High Strength Bolts

    2014-12-12 · Recommended Maximum Bolt Loads and Torque Values (UNF Threads) UNF Quality P S T A/F in Newtons N.m lbf lbf.ft Newtons N.m lbf lbf.ft Newtons N.m lbf lbf.ft in 1 4 5232 6.28 1176 4.63 9941 11.9 2234 8.78 10730 12.9 2412 9.51 7 16 5 16 8410 12.5 1891 9.22 ...

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  • Tension Jack/Pull Test Kit - DSI Underground Canada

    2018-9-21 · anchor slips or the bolt breaks, the capacity of the bolt drops to zero and the rock being supported can fall. This problem is less severe in the case of a fully grouted or friction anchored dowel because, even if slip does occur or if the face plate breaks off, the remaining length of the dowel is still anchored and will continue to provide ...

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  • Rock Bolt Testing - ME SAFE - Mining Equipment Safety

    2018-5-18 · OPTIMUM MOISTURE CONTENT DETERMINATION (A Modification of AASHTO Designation T 99 - ANNEX) 1. SCOPE . 1.1 This procedure is used to determine the corrected maximum dry density and optimum moisture content for a sample of material when coarse aggregate or rock particles are retained on the No. 4 sieve (for Method A proctor) or 3/4 inch

    Get Price
  • ROCK CORRECTION PROCEDURE FOR MAXIMUM DRY

    Four statistical models for predicting optimum bolt supports using a minimum solid beam thickness were established, and based on these results, a design criterion was proposed. To meet support needs in various geological and geotechnical settings, a variety of bolt types have been developed.

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  • A New Rock Bolt Design Criterion and Knowlwdge

    2020-2-21 · The target reliability based design optimization (TRBDO) is used to obtain an optimum length of the rock bolt and optimum anchor force required to stabilize the rock slope in order that the reliability index must meet a desired level of safety. Recommended. Recommended

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  • Reliability Based Optimum Design of Anchored Rock

    Yu et al. [5, [26][27][28][29] established the mechanical model of overlap arch bearing body in allusion to the united supporting characteristics of anchor, spray net, and cable bolt of deep wall ...

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  • Deformation Characteristics and Determination of

    Hardness testing devices that work according to the Rockwell procedure are the most widespread. The most important advantages are: deviations due to personal estimations are avoided; it is less sensitive to rough surfaces (even though the standard says that surfaces have to be flat and carefully abraded).

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  • Guidelines to hardness testing - Hegewald & Peschke

    2018-9-21 · Reader in Rock Mechanics J. A. Franklin M.Sc, B.Sc.(Eng.), D.I.C. Assistant Lecturer both of the Interdepartmental Rock Mechanics Project, Imperial College, London Synopsis A simple and inexpensive triaxial cell for testing rock core specimens at confining pressures up to 10 000 lbf/in 2 is described. The cell weighs only 10 lb and employs a self-

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  • Simple triaxial cell for field or laboratory testing of rock

    5.2 During design of an engineered fill, testing performed to determine shear, consolidation, permeability, or other properties requires test specimens to be prepared by compacting the soil at a prescribed molding water content to obtain a predetermined unit weight. It is common practice to first determine the optimum water content (w opt) and maximum dry unit weight (γ dmax) by means of a ...

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  • Soft Sandstone Rock Anchor Testing at Swinburne -

    Hardness testing devices that work according to the Rockwell procedure are the most widespread. The most important advantages are: deviations due to personal estimations are avoided; it is less sensitive to rough surfaces (even though the standard says that surfaces have to be flat and carefully abraded).

    Get Price
  • Guidelines to hardness testing - Hegewald & Peschke

    Hilti's anchor site testing service is the solution. Schedule anchor site testing. As a Structural Engineer, you may not have enough data available to determine the resistance of a post-installed anchor for a safer, efficient and cost-effective design. Approval documents …

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  • Testing of ground anchors - equipment and test types

    2019-12-21 · 3.1.2 standard effort—in compaction testing, the term for the 12 400 ft-lbf/ft3 (600 kN-m/m3) compactive effort applied by the equipment and methods of this test. 3.1.3 standard maximum dry unit weight, g d,max in lbf ft3 (kN/m3)—in compaction testing, the maximum value de-fined by the compaction curve for a compaction test using standard ...

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  • Anchor Site Testing - Hilti Corporation

    2013-3-10 · Item 225.3 - Rock Dowels (Untensioned Rock Bolt) Description 1.1 This work shall consist of furnishing, drilling and installing, grouted rock dowels and accessories at the locations and in the patterns shown on the plans or as ordered. On this project, it may be necessary to install rock dowels at any location on the rock face. A rock dowel is a

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  • Standard Test Methods for Laboratory Compaction ...

    JOMINY TESTING. The Jominy test (End Quench Test) is a standardized test procedure used to determine the hardenability of steel, and it can be performed using any Vickers micro hardness tester. The procedure is described in the following standards: ASTM A255 ISO 642 DIN 50191 BS 4437

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  • Soft Sandstone Rock Anchor Testing at Swinburne -

    2012-2-21 · What is the Bolt System Designed to do? Rock bolts are used as the main support for structures such as tunnels and mines where safety is critical. 3 . Weak Strata Laminated Strata Individual laminations bound ... Cement grouted rock bolts reaches optimum strenght in few days.

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  • Testing of ground anchors - equipment and test types

    2015-8-3 · The line of optimum moisture contents is usually around 85% saturation and the optimum moisture content decreases with increasing compactive effort. Which Test Are You Using? Standard Proctor 12,400 ft -lbs/ft. 3. California Test 216 -F 37,000 to 44,000 ft -lbs/ft. 3. Modified Proctor 56,250 ft -lbs/ft. 3. The most important figure in this lecture

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  • Cement grouted rock bolts - yunus.hun.edu.tr

    2019-12-21 · 3.1.2 standard effort—in compaction testing, the term for the 12 400 ft-lbf/ft3 (600 kN-m/m3) compactive effort applied by the equipment and methods of this test. 3.1.3 standard maximum dry unit weight, g d,max in lbf ft3 (kN/m3)—in compaction testing, the maximum value de-fined by the compaction curve for a compaction test using standard ...

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  • Part 4 COMPACTION TESTING

    2015-12-9 · cover pressure testing of new and existing pressure systems or components at a test pressure more than 0 psig. They apply to mechanics, supervisors, inspectors, custodians, and subcontractors responsible for pressure tests. 2 Procedures . Pressure tests are performed to ensure the safety, reliability, and leak tightness of pressure systems. A

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  • Standard Test Methods for Laboratory Compaction ...

    JOMINY TESTING. The Jominy test (End Quench Test) is a standardized test procedure used to determine the hardenability of steel, and it can be performed using any Vickers micro hardness tester. The procedure is described in the following standards: ASTM A255 ISO 642 DIN 50191 BS 4437

    Get Price
  • Rock Bolt Pull Out Test, पुल टेस्टर, पुल परीक्षक in

    2014-12-12 · Recommended Maximum Bolt Loads and Torque Values (UNF Threads) UNF Quality P S T A/F in Newtons N.m lbf lbf.ft Newtons N.m lbf lbf.ft Newtons N.m lbf lbf.ft in 1 4 5232 6.28 1176 4.63 9941 11.9 2234 8.78 10730 12.9 2412 9.51 7 16 5 16 8410 12.5 1891 9.22 ...

    Get Price