Rock Bolt Pull Out Test Apparatus

Standards:IS 11309, ASTM D 4435 Specification: The objective of the test method is to measure the working and ultimate capacities of rock bolt anchors. The system comprises of a central hole jack, hand pump with a load gauge, directional control value (only for central hole jacks above the capacity of 500 kn), flexible hose pipe … Rock Bolt Pull …

Critical embedment length and bond strength of fully …

In such a test, a rock bolt grouted in a borehole is either pulled out to measure the bond strength in the case of a short embedment length (Hyett et al., 1995, Benmokrane et al., 1992, Benmokrane et al., 1996, Zhao and Yang, 2011) or pulled until failure of the rock bolt shank (Stillborg, 1994, Stjern, 1995, Chen and Li, 2015).

A Study of Correlations between Rock Bolt Pull-Out Tests and Rock …

Bolts used in this study are inflatable friction bolts, primarily Swellex bolts by but with a few other manufacturers of inflatable friction bolts as well. When data was controlled for corrosive weakening of the bolt and normalized for bolt length, correlations between slipped pull-tests and low RMR scores were generally strong ...

ANALYSIS OF SWELLEX BOLT PERFORMANCE …

which quantify the influence of various factors on the performance of the Swellex bolt. were evaiuated. A set of recornrnendations was forrnulated in order to assist in the pncticai design and efficient use of Swellex bolts. Little pull test data existed conceming Swellex bolts. and the information available was non-

Performance of a New Yielding Rock Bolt Under Pull and …

High 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 …

Swellex

7 Swellex rock bolts Swellex load capacity Description Minimum breaking load, expanded profile (kN) Minimum yielding load, expanded profile (kN) Minimum elongation "A5" (%) Profile diameter (mm) Material thickness (mm) Original tube diameter (mm) Injection bushing diameter (mm) Bushing head (mm) Bore hole diameter (mm) Expansion …

Safety in Swellex | Epiroc US

Rock bolting and mesh were installed as required to provide safe working conditions. The shale contained very little limestone. Strengths ranged from 80 to 100 MPa. …

An Overview of the Use of Rockbolts as Support Tools in …

Frictional-anchored rockbolts are divided into two categories based on the mode of operation, namely: swellex bolts and split set bolts. 3.3.1 Swellex Bolts. ... Kristjánsson G (2014) Rock bolting and pull-out test on rebar bolts. Norwegian University of Science and Technology, Trondheim.

SS-39 pull tester

as realignment of the tester housing, bearing plate settling, or localized rock crushing. These must not be mistaken for tube slippage.) Once the bolt has slipped in the hole, pressurize the tester pump until the bolt slips again. The same pull load should cause subsequent slippage. Interpreting test data After the above pull tests are ...

Swellex

PULL OUT TEST FOR ROCK BOLT Rock bolt are used to …

PULL OUT TEST FOR ROCK BOLT Rock bolt are used to provide support to the fractured or jointed rock so that it behaves as an intact rock mass. Rock bolt consisting of rod, …

Montana Tech puts Epiroc Swellex bolts to the test

As part of the test, sleeves will be used on bolts to qualify the critical bond length of Swellex bolts under forced displacement without loss of integrity in the bolts. The Pull Test Kit supplied will be essential to testing the bolts' load and deformation characteristics in that rock mass and borehole.

Performance of the Swellex bolt in hard and soft rocks

The performance of a typical conventional rock bolt (fully grouted rebar) and a typical energy-absorbing rock bolt (D-bolt) under the scenarios of suspending loosened blocks and rock dilation is ...

Ultimate Bond Strength of Anchors in Rock | Geotechpedia …

-R a,d is the design pull-out resistance of the anchorage. Two ways of determining the design pull-out resistance R a,d are discussed in EC7 [2]; the first one refers to the pull-out resistance derived from the results of tests on anchorages and the second one is based on calculations [EN 1997-1 §8.5.1 (2)].

Analysis of Inflatable Rock Bolts | Rock Mechanics and Rock …

Pullout tests of Super Swellex bolts were carried out in an artificial weak rock-like material. The artificial material was made of 0–8 mm sand (59 % by weight), cement (13 %), bentonite (3 %), and water (25 %). ... Soni A (2000) Analysis of Swellex bolt performance and a standardized rock bolt pull test datasheet and database. …

A Review of Rock Bolt Monitoring Using Smart …

Smart sensors that are used to assess rock bolt integrity are reviewed to provide a firm perception of the application of smart sensors for enhanced performance and reliability of rock bolts. The most widely …

Analytical models for rock bolts

The shear stress and the axial load along the Swellex bolt are calculated using the relevant equations above and are illustrated in Fig. 9. The axial load of the bolt at different levels of applied load is shown in Fig. 10. Download: Download full-size image; Fig. 9. The shear stress and axial load along a Swellex rock bolt at 5 kN of applied load.

Performance of the Swellex bolt in hard and soft rocks

Laboratory-scale pull-out tests of the rock bolt, installed in a thick steel tube, were performed to investigate the friction behavior between the steel tube and the smooth wall of a drilled hole ...

Swellex Rock Bolts, Swellex Bolts -ZongXiang

The Swellex rock bolt is made out of a welded steel tube folded on itself and sealed at one extremity, while the other extremity is set with a special head bushing used for inflation and retaining of the face plates typically used in rock bolting. ... In fact, a Swellex rock bolt has the easiest pull test operation of any rock bolt type ...

Pull Test Kit 30 toncapacity

• When testing Split Set, Swellex, or forged head bolts, the pull collar must be put onto the bolt BEFORE installation of the bolt • 30 ton units available for sale or rent • Comes complete with wooden crate ™ ™™ • Pull test collars available upon request Pull Test Kit 30 ton capacity Complete Assembly ...

34th International Conference on Ground Control in …

Most underground mines in Nevada use Swellex-type inflatable rock bolts due to their simple and fast installation procedure. ... bolt pull-out test values measured in metric tonnes per meter and

Tension Jack/Pull Test Kit

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 …

SS-39 pull tester

SS-39 pull test equipment. The Split Set stabilizer is a unique rock stabilization and support system. It interacts with the rock differently from other rock bolts. For this …

Inflatable Rock Bolt Bond Strength vs. Rock Mass …

To investigate a correlation between these parameters, the minimum bond strength of pull-out tested inflatable rock bolts was compared to the RMR of the rock in which these bolts were placed.

The Quality Control of Rock Bolts | ISRM Congress | OnePetro

ABSTRACT:. A two-year series of tests on the long-term load bearing capacity of rock bolts has been carried out. The bolt types tested were cement grouted rebar, resin grouted rebar, expansion shell anchor, Split-set and Swellex. Five different mines were used as test sites to find out the effect of different environments. The work …

Epiroc Swellex Brochure

Swellex ® The Swellex rockbolt is a sealed steel tube folded on itself which upon installation is expanded with high water pressure offering strong performance and interaction with rock mass, assurance of perfect installation for every bolt and quick installation. The extensive application range, speed and quality

Secoroc Rock Drilling Tools SWELLEX ROCK BOLTS

Swellex pull test equipment ... It is a unique rock bolt, as it is made out of a welded tube folded onto itself and sealed at one extremity. It is re-expanded using a high pressure water flow provided by a special pump and adapter. The bolt is …

Rock bolts application and types you should know

The grouted rock anchor also provides resistance to any potential pull-out or lateral movement, making it a reliable choice for applications such as tunneling, mining and slope stabilization. For example, if there is a slope that is prone to landslides, grouted rock anchor bolts can be used to secure the unstable rock and prevent any further ...

Inflatable rock bolt bond strength versus rock mass rating …

Semantic Scholar extracted view of "Inflatable rock bolt bond strength versus rock mass rating (RMR): A comparative analysis of pull-out testing data from underground mines in Nevada" by C. .. Barnard et al. ... Analysis of Swellex bolt performance and a standardized rockbolt pull test datasheet and database. A. Soni. Engineering. 2000; 12. PDF.