point load test for granite rock

point load test for granite rock

Point Load Test | Geoengineer.org

Point Load test is an alternate method that can be used to adequately predict the uniaxial compressive strength of a rock material using a portable and simpler equipment. Schmidt Hammer Rebound test is also a technique used for this purpose but, it is admitted that its results are far more variable and affected by testing methods.

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Evaluation of the Point Load Test for Rock

2019-12-12 · In that the point load test is related to various other' tensile tests for concrete and rock, the direct origins of the point load test are somewhat uncertain. In one of the earliest references available, a Russian, Protodyakonov (1), reported testing irregular rock specimens roughly shaped by hammering.

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USING THE POINT LOAD TEST TO DETERMINE THE

2012-8-29 · The point load test (PLT) is an accepted rock mechanics testing procedure used for the calculation of a rock strength index. This index can be used to estimate other rock strength parameters. The focus of this paper is to present the data analysis used

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Point Load Tester PLT-10 | Rock Strength Testing ...

The Geosystems PLT-10 is the safest machine on the market. In some Australian iron ore projects, the grade is high resulting in a very high strength rock that 50kN or 70kN units cannot cope with. With a rating of up to 10 ton (98kN) loads the PLT-10 is the perfect

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Laboratory Testing and Interpretation of Rock Properties

2012-5-29 · Common laboratory tests for intact rocks include measu rements of strength (point load index, compressive strength, Brazilian test, direct shear), stiffness (ultrasonics, elastic modulus), and durability (slaking, abrasion). Table 8-1 gives a summary list of laboratory rock tests and procedures by ASTM. Brief sections

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Guidelines on Rock Identification-1

2021-10-14 · 3.7 Criterion 7: Point Load Test Index 7 4. Application of guidelines at piling site involving rock drilling 11 References 12 Appendix 1- Checklist for identification of rocks with weathering grade III or better Appendix 2 - Point load test on irregular rock lumps (template calculation sheet)

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(PDF) Correlation between uniaxial strength and point load ...

2021-11-12 · The point load index test is based on the principle that rock sample is broken between two conical platens. Failure load and specimen dimensions are used

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STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1 ...

2006-3-19 · Broch and Franklin (1972) proposed a testing method called the Point Load Test. The test consists of squeezing pieces of rock diametrically between two hardened steel cones. The test set-up is shown in Figure 1. For these tests, rock pieces must have a length at least 1.4 times their diameter (Figure 2a). The point load index, Id, is equal to

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8. STRENGTH OF SOILS AND ROCKS

2009-2-23 · Either three point or four point loading (Fig. 8.6) may be used in the test. For a cylindrical rock specimen (diameter d) and the four point loading arrangement as shown in Fig. 8.6, it may be shown that the tensile strength ( σt) is σt = 32 PL/(3 πd3) (8.2) where P is the failure load applied at each of the third points along the beam.

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Point load strength index of granitic irregular lumps ...

The Uniaxial Compressive Strength (UCS) of rock cores is a key parameter for design analysis of rock engineering projects such as rock tunnels and piles in rockets. Diametral and axial point load tests on cylinder cores have been used to obtain Point Load Strength Index (PLSI). This PLSI is correlated to

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Point Load Tester PLT-10 | Rock Strength Testing ...

The Geosystems PLT-10 is the safest machine on the market. In some Australian iron ore projects, the grade is high resulting in a very high strength rock that 50kN or 70kN units cannot cope with. With a rating of up to 10 ton (98kN) loads the PLT-10 is the perfect

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Correlation between the point load index (Is(50)) and the ...

2014-12-11 · 3.2 POINT LOAD TEST (PLT) The Point Load Test is also known as the Franklin test. The first reference is by Reichmuth, D. (1968) [10], who proposed obtaining the resistance to a point load and a determination of the unconfined compression strength via correlation, regardless of whether they are irregular, regular, or cylindrical rock controls [11].

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(PDF) Correlation between uniaxial strength and point load ...

2021-11-12 · The point load index test is based on the principle that rock sample is broken between two conical platens. Failure load and specimen dimensions are used to calculate the point load strength index.

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Guidelines on Rock Identification-1

2021-10-14 · 3.7 Criterion 7: Point Load Test Index 7 4. Application of guidelines at piling site involving rock drilling 11 References 12 Appendix 1- Checklist for identification of rocks with weathering grade III or better Appendix 2 - Point load test on irregular rock lumps (template calculation sheet)

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Conversion of Point Load Test Results to Conventional ...

concluded that axial point load test is the most preferable indirect test method to predict the UCS with a conversion factor of 23.6 for studied rocks [4].

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(DOC) Conversion of Point Load Test Results to ...

2013-12-21 · Conversion of Point Load Test Results to Conventional Strength Tests for Shale, Claystone and Limestone Rocks Abdolreza Osouli1, Behrooz Moradi Bajestani2 , Iman Shafii3 1- Assistant Professor, Civil Engineering Department, Southern Illinois University of Edwardsville, Edwardsville, IL, [email protected] 2- Research Assistant, Civil Engineering Department, Southern Illinois University of ...

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Predicting Uniaxial Compressive Strength by Point Load ...

2006-3-30 · N. Brook (1985) ArticleTitle The equivalent core diameter method of size and shape correction in point load testing Int. J. Rock Mech. Min. Sci. Geomech. Abstr. 22 61–70 Occurrence Handle 10.1016/0148-9062(85)92328-9

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Correlation between Uniaxial Compressive Strength and ...

2008-6-6 · The point load test has been reported as an indirect measure of the compressive or tensile strength of the rock. D’Andrea et al.[4] performed uniaxial compression and the point load tests on a variety of rocks. They found the following linear regression model to correlate the UCS and Is(50). qu = 16.3 + 15.3 Is(50) where

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Estimating Unconfined Compressive Strength of

2014-5-16 · 4. Point Load Test The ASTM-D5731-08 [8] code gave a clear justification for the use of the point load test. The code started its justification by giving statements about the time and money spent on performing a UCS test and recommended the use of simpler in-situ tests of which the point load test was one of them. The code also stated that this ...

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Estimating the geotechnical properties of heterogeneous ...

2021-11-12 · Point Load Test on samples in which the load can be applied normal to bedding or ... rock type. For example, the term “granite” described a clearly defined rock type and all granites exhibit very similar mechanical characteristics. Hence the value of m i is defined as 32 ± 3. On the other hand, the term “volcanic breccia” is not very ...

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(DOC) Conversion of Point Load Test Results to ...

2013-12-21 · Conversion of Point Load Test Results to Conventional Strength Tests for Shale, Claystone and Limestone Rocks Abdolreza Osouli1, Behrooz Moradi Bajestani2 , Iman Shafii3 1- Assistant Professor, Civil Engineering Department, Southern Illinois University of Edwardsville, Edwardsville, IL, [email protected] 2- Research Assistant, Civil Engineering Department, Southern Illinois University of ...

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Conversion of Point Load Test Results to Conventional ...

concluded that axial point load test is the most preferable indirect test method to predict the UCS with a conversion factor of 23.6 for studied rocks [4].

Read More
Point Load Tester PLT-10 | Rock Strength Testing ...

The Geosystems PLT-10 is the safest machine on the market. In some Australian iron ore projects, the grade is high resulting in a very high strength rock that 50kN or 70kN units cannot cope with. With a rating of up to 10 ton (98kN) loads the PLT-10 is the perfect

Read More
Standard Test Method for Determination of the Point Load ...

5.4 Rock specimens in the form of either core (the diametral and axial tests), cut blocks (the block test), or irregular lumps (the irregular lump test) are tested by application of concentrated load through a pair of truncated, conical platens. Little or no specimen preparation is needed and can therefore be tested shortly after being obtained and any influence of moisture condition on the ...

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Estimating the geotechnical properties of heterogeneous ...

2021-11-12 · Point Load Test on samples in which the load can be applied normal to bedding or ... rock type. For example, the term “granite” described a clearly defined rock type and all granites exhibit very similar mechanical characteristics. Hence the value of m i is defined as 32 ± 3. On the other hand, the term “volcanic breccia” is not very ...

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Predicting the Uniaxial Compressive and Tensile Strengths ...

2011-11-2 · The point load strength index (PLSI), an indirect strength test, has been correlated empirically with both the compressive and tensile strengths of rock. The point load test (PLT) may be applied to cylindrical specimens, either along the axis, or the diameter, but as noted by Chau ( 1998 ), the diametral PLT is preferred (Bieniawski 1975 ).

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Rock testing - SlideShare

2018-6-28 · • Test can be conducted on dry or 2 days soaked specimens. • Point load Index Is= P/ D2 • Anisotropic specimen test along and across the bedding plane Type of rock Point Load index Is (Mpa) Dolomite 6-11 Limestone 0.25-8 Shale 0.2-8 Volcanic rocks 3

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Rock Mechanics

2015-10-23 · Failure of a brittle rock - point when the rock loses all resistance to stress and crumbles. ! In plastic material, specific point of failure difficult to identify - because deformation continues indefinitely at a constant level of stress. ! Strength (in plastic materials) – is defined as the level of stress at failure. Compressive Strength! 20

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Correlation of rock strength between uniaxial compressive ...

2021-6-9 · Rock engineering design for underground or on-the-ground projects and operations are widely dependent on different properties of rocks among which strength is one of the main components. The uniaxial compressive strength (UCS) test is still considered to be the most effective method, currently used by many industries to estimate either intact or rock massstrength along with other rock ...

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rock - Physical properties | Britannica

2021-11-20 · rock - rock - Physical properties: Physical properties of rocks are of interest and utility in many fields of work, including geology, petrophysics, geophysics, materials science, geochemistry, and geotechnical engineering. The scale of investigation

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