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  • POINT LOAD STRENGTH INDEX TEST OF ROCK (IS-8764 ...

    EquipmentsDiametral TestAxial TestBlock Or Irregular Lump Test1. Point load strength test machine 2. A 100 mm scale attached with the loading frame 3. Pressure gauge (Capacity 25 kN or 50 kN)Depending upon the size and shape of test specimen, the point load strength index can be conducted by four different methods. These are 1. Diametral Test 2. Axial Test 3. Block Test 4. Irregular lump Test在civilblog.org上查看更多信息
  • Point Load Test

    The Point Load Test, also known as the Point Load Strength Index Test, is used to calculate the rock strength index of a rock specimen. From the rock strength index, other rock parameters, such as the uniaxial compressive strength, can be estimated.This test is very economical due to the simplicity of the apparatus and the minimal amount of required materials to execute.

  • USING THE POINT LOAD TEST TO DETERMINE THE UNIAXIAL ...

    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 to correlate the point load test index (Is50) with

  • Point Load Test JKTech

    In a Point Load Test, a sample of rock is mounted between two pointed plates and pressure is applied until failure of the sample occurs. The peak applied load is recorded. This is repeated on a minimum of 20, ideally 50 pieces of rock within a sample with the results used to calculate the Point Load Index.

  • Standard Test Method for Determination of the Point Load ...

    This standard is issued under the fixed designation D 5731; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of

  • Portable Point Load Test Apparatus - APS - Wille Geotechnik

    A sample of rock is mounted between two pointed platens. Pressure is then applied until failure (breakage) of the sample occurs. The peak-applied load is recorded and used to calculate the point load index. The standard test-set is consisting of: Hydraulic cylinder with conical pistons; Hydraulic pump; Digital-manometer with pressure and load ...

  • Standard Test Method for Determination of the Point Load ...

    load is used to calculate the point load strength index. 4.2 The point load strength index can be used to classify the rocks. A common method used is by estimating the uniaxial compressive strength. 5. Significance and Use 5.1 The uniaxial compression test (seeTest Method D 7012) is used to determine compressive strength of rock specimens.

  • (PDF) Using the point load test to determine the uniaxial ...

    The following procedure was followed:The point load test (PLT) is an accepted rock mechanics testing procedure used for the calculation of rock strength indexfigure(2-2).This index can be used to ...

  • AMERICAN SOCIETY FOR TESTING AND MATERIALS Reprinted

    5.3 This test method is performed to determine the point load strength index (Is(50)) of rock specimens, and the point load strength anisotropy index (Ia(50)) that is the ratio of point load strengths on different axes that result in the greatest and least values. 5.4 Rock specimens in the form of

  • Standard Test Method for Determination of the Point Load ...

    5.3 This test method is performed to determine the point load strength index of rock specimens and, if required, the point load strength anisotropy index. 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 ...

  • Point Load Test JKTech

    In a Point Load Test, a sample of rock is mounted between two pointed plates and pressure is applied until failure of the sample occurs. The peak applied load is recorded. This is repeated on a minimum of 20, ideally 50 pieces of rock within a sample with the results used to calculate the Point Load Index.

  • STANDARD OPERATING PROCEDURE No. 77 POINT LOAD

    Calculate the corrected Point Load Strength Index (Is): F D P Is e =! 502, where: Is ... The Point-Load Strength Test. Int. J. Rock Mech. Min. Sci., 9, 669-697 (1972). Questa Rock Pile Stability Study SOP 77v3 Page 7 SOP 77v3 10/30/2008 APPENDIX I. International Society of Rock Mechanics (ISRM) – SUGGESTED METHOD FOR DETERMINING POINT LOAD

  • The point-load strength test - ScienceDirect

    An index test for strength classification of rock materials is described. The test uses portable equipment. Specimens require no machining and can take the form of either rock core or irregular lumps. A single ‘point-load strength index’ can be obtained whatever the shape of specimen, provided that this shape is maintained within prescribed ...

  • Point load test (PLT) - types and principles of testing

    Point load test (PLT) The Point load test is an index test by which the rock is classified according to the strength. The test can be used to estimate other characteristics of intact rocks with which it correlates, such as uniaxial compressive and tensile strength. The test determines the strength index values at a point (Is (50)) and the ...

  • PIL-7 Point Load Tester Roctest

    Test Procedure. Three point load test configurations are used depending on the available rock specimens: Diametrical – Axial – Irregular lumpThe diametrical and axial tests use core specimens with length/diameter (L/D) ratios greater than 1.0 in the first case, and between 0.3 and 1.0 in

  • How to Calculate a Point Load Sciencing

    A point load is an equivalent load applied to a single point, which you can determine by calculating the total load over the object’s surface or length and attributing the entire load to its center. Determine the total length or area to which a load is applied. For example, if a load of 10 kilonewtons (kN) per square meter is applied to an ...

  • Point load test application for estimating compressive ...

    Richardson (1989) conducted a point load tests of cast specimens with various diameters as 50.8, 76.2 and 101.6mm. The advantages of using the point load test relate to a smaller cost per unit test when compared to compressive strength testing of concrete cores and to the speed with which the test can be performed. Testing large

  • The point-load test in geotechnical practice - ScienceDirect

    APPLICATIONS OF THE POINT-LOAD TEST The point-load test is particularly useful for strength classification of rock materials. Although many classifications have been proposed, it is believed that a classification based on a proposal by Deere and Miller (1966) is particularly realistic and convenient for use in the field of geomechanics.

  • Point-load strength: An index for classification of rock ...

    Point-load strength (Is) as a measure for the determination of rock strength and for estimating uniaxial (unconfined) compressive strength (UCS) are described and both put together and used for rock strength classification of brittle and hard rocks. The estimated point-load strength values of specimens of varying sizes and also the values corrected to a standard thickness of 50 mm, and the ...

  • MinE 323-Point load strength Index (lab 1) - YouTube

    Jun 19, 2018  MinE 323-Brazilian Tensile Strength Test (lab 3) - Duration: 9:23. Civil and Environmental Engineering, School of Mining and Petroleum Engineering 3,070 views

  • 作者: Civil and Environmental Engineering, School of Mining and Petroleum Engineering
  • Correlation between the point load index (Is(50)) and the ...

    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].

  • Gravel Calculator - Estimate Landscaping Material in Yards ...

    As a shortcut, try our cubic yardage calculator to conveniently calculate your volume. Step Two: Calculate Weight in Tons. Armed with the volume of material needed in cubic yards, the weight of material in tons can be found by multiplying the volume by the material density. Most gravel weighs 1.4 to 1.7 tons per cubic yard.

  • (PDF) The point-load strength test - ResearchGate

    The Point Load Index is a geomechanical test used to measure rock fragment strength (Broch and Franklin 1972) and has been correlated with rock mass parameters like

  • Point load testing of weak rocks with particular reference ...

    The Point Load Test (PLT) was developed as an index test to predict the Uniaxial Compressive Strength (UCS) of core too broken for UCS testing. A correlation factor (K) between UCS and PLT strength of 24 has been proposed although this value is disputed.

  • Point load test (PLT) - types and principles of testing

    Point load test (PLT) The Point load test is an index test by which the rock is classified according to the strength. The test can be used to estimate other characteristics of intact rocks with which it correlates, such as uniaxial compressive and tensile strength. The test determines the strength index values at a point (Is (50)) and the ...

  • Point load test application for estimating compressive ...

    Richardson (1989) conducted a point load tests of cast specimens with various diameters as 50.8, 76.2 and 101.6mm. The advantages of using the point load test relate to a smaller cost per unit test when compared to compressive strength testing of concrete cores and to the speed with which the test can be performed. Testing large

  • Correlation between Uniaxial Compressive Strength and ...

    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

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

    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].

  • Unconfined Compressive Strength Test of Rock

    This test method specifies the apparatus, instrumentation, and procedures for determining unconfined compressive strength of intact rock core specimens. This procedure is identical to ASTM D 2938 except that the cores are tested after cutting without grinding, and neoprene caps are used on the specimen ends. Unconfined Compressive Strength Test Procedure Check the ability of the spherical seat ...

  • LABORATORY TESTS TO DETERMINE STRENGTH OF ROCKS

    The load should applied at the rate of 0.2KN/sec. and the load should be measured at least to an accuracy of 1%. Beam Bending Test on Rocks. In this test beam is subjected to bending till failure occurs. This is also called as flexural test. Generally 4 –point flexural loading system is used in this test.

  • STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1 ...

    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

  • Determining Rock Mass Bearing Capacity and Strength ...

    A final foundation design is controlled by considerations such as settlement, stability from sliding and overturning rather than by bearing capacity. However it is still makes sense for a designer to evaluate the rock mass strength bearing capacity to ensure that the designed loads in no way exceed the capacity of the rock to carry the required load.

  • THE UNIAXIAL COMPRESSIVE STRENGTH OF SOFT ROCK

    each type of rock. Laboratory point load strength test follows the methods suggested by the ISRM [18]. In this study the strength index test used a speed control Instron machine with a maximum load cell of 5 kN. Specimens were core samples with a diameter of 37.5 mm, and a thickness of 20 mm. Similar rocks

  • Gravel Calculator - Estimate Landscaping Material in Yards ...

    As a shortcut, try our cubic yardage calculator to conveniently calculate your volume. Step Two: Calculate Weight in Tons. Armed with the volume of material needed in cubic yards, the weight of material in tons can be found by multiplying the volume by the material density. Most gravel weighs 1.4 to 1.7 tons per cubic yard.

  • CBR Test Procedure - California Bearing Ratio for Road Design

    It is the ratio of force per unit area required to penetrate a soil mass with standard circular piston at the rate of 1.25 mm/min. to that required for the corresponding penetration of a standard material. The California Bearing Ratio Test (CBR Test) is a penetration test developed by California State Highway Department (U.S.A.) for evaluating the bearing capacity of subgrade soil for design ...

  • Analysis of point load test as a method for preliminary ...

    This paper deals with the analysis of the point load compression test made on irregular-shaped rock fragments, proposed in the late 50’s by Protodiakonov. An ample revision of the literature on the subject has been made, and a series of tests, using seven different types of rock materials, has been developed. The results obtained from these tests showed that parameters generally used in ...

  • Point-Load Test Mining SGS

    The Point-load Test measures the Point Load Strength Index (Is(50)) of rock specimens, and their Strength Anisotropy Index (Ia(50)), which is the ratio of Point Load Strengths in directions that give the greatest and least values. Rock specimens in the form of core (diametral and axial tests), cut blocks (block test), or irregular lumps ...

  • Rock Strength Testing Alliance Geotechnical

    Point Load Test – Used to determine the Point Load Strength Index (Is(50)). This index provides a method for establishing rock strength classification. The point load test apparatus and test procedure provides economical testing of core or lump rock samples. In order to estimate uniaxial compressive strength, index-to-strength conversion ...

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

    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].

  • Rock Strength Testing Alliance Geotechnical

    Point Load Test – Used to determine the Point Load Strength Index (Is(50)). This index provides a method for establishing rock strength classification. The point load test apparatus and test procedure provides economical testing of core or lump rock samples. In order to estimate uniaxial compressive strength, index-to-strength conversion ...

  • Point load testing of weak rocks with particular reference ...

    The Point Load Test (PLT) was developed as an index test to predict the Uniaxial Compressive Strength (UCS) of core too broken for UCS testing. A correlation factor ( K ) between UCS and PLT strength of 24 has been proposed although this value is disputed. This paper investigates the value of K for chalk and other weak rocks using published and unpublished data sets and concludes that K is not ...

  • Estimating Unconfined Compressive Strength of Sedimentary ...

    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 ...

  • Velkommen til RockMass

    Created Date: 5/21/2010 11:04:26 AM

  • LABORATORY TESTS TO DETERMINE STRENGTH OF ROCKS

    The load should applied at the rate of 0.2KN/sec. and the load should be measured at least to an accuracy of 1%. Beam Bending Test on Rocks. In this test beam is subjected to bending till failure occurs. This is also called as flexural test. Generally 4 –point flexural loading system is used in this test.

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

    Conversion of Point Load Test Results to Conventional Strength Tests 21 Dec

  • THE UNIAXIAL COMPRESSIVE STRENGTH OF SOFT ROCK

    each type of rock. Laboratory point load strength test follows the methods suggested by the ISRM [18]. In this study the strength index test used a speed control Instron machine with a maximum load cell of 5 kN. Specimens were core samples with a diameter of 37.5 mm, and a thickness of 20 mm. Similar rocks

  • International Society for Rock Mechanics “THE COMPLETE ...

    of the point load test frame through the holes at its both ends and then it is attached to the ram of the frame by means of a block with a hole at its bottom 4. Testing procedure: Specimen thickness = 5 – 15 mm Diameter of specimen = 42 mm (BX) – 54 mm (NX) Loading rate = Failure occurs within 10 – 60 sec (as in point load testing) (b)

  • Gravel Calculator - Estimate Landscaping Material in Yards ...

    As a shortcut, try our cubic yardage calculator to conveniently calculate your volume. Step Two: Calculate Weight in Tons. Armed with the volume of material needed in cubic yards, the weight of material in tons can be found by multiplying the volume by the material density. Most gravel weighs 1.4 to 1.7 tons per cubic yard.

  • ISRM

    Point Load Test (2016) Based on the cooperation between Prof. Seokwon Jeon from Seoul National University (South Korea) and the ISRM Commission on Testing Methods, video films on the ISRM Suggested Methods, which are made for educational purpose, will be embedded in

  • 8. STRENGTH OF SOILS AND ROCKS

    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.

  • Estimating Rock Mass Strength - BM 1997 02

    3 surface as a function of the normal stress is required. Procedures to deal with this obstacle will be discussed in Chapter 3 of this report. For intact rock, s = 1 and m = mi.Values for mi can be calculated from laboratory triaxial testing of core samples at different confining stress, or extracted from reported test

  • Practical Method of Conducting the Indirect Tensile Test

    The indirect tensile test involves loading a cylindrical specimen with compressive loads which act parallel to and along the vertical diametrical plane, as shown in Fig 1. To distribute the load and maintain a constant loading area, the compressive load is applied through a ha1f-inch-wide stain­