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Evaluation of the Point Load Test for Rock

ratio, it should be possible to estimate the unconfined compressive strength from the point load required for failure 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...

Get Point Load Test - Microsoft Store

The operator can also define a custom equation for determination of the unconfined compressive strength from the point load strength index as calculated by the test The application will automatically graph the load versus equivalent core diameter and automatically calculate the unconfined compressive strength for the rock specimen...

Drillability and Strength Characteristics of Selected ,

The results of uniaxial compressive strength for the eight selected rocks vary from 8990 - 12471 MPa and were classified as very high compressive strength characteristics and the rock characteristics from Porphyritic Hornblende-Granite to Medium Biotite-Granite on the basis of point load strength index range from high to very high strength index...

Predicting the compressive and tensile strength of rocks ,

Predicting the compressive and tensile strength of rocks from indentation hardness index Equation [1] was obtained from the IHI testing performed on ultramafic and basaltic rocks In this study, the relation between IHI and both UCS and BTS was investigated for igneous, metamorphic, and sedimentary rocks...

Point Load - Uniaxial Compressive Strength Correlation ,

ABSTRACT: The uniaxial compressive strength of rock materials could be estimated by adopting a simple, quick, and less expensive index - the point load strength However, no one specific value of the correlation factor (k) exists for all rock types s...

INTERDEPENDENCE BETWEEN POINT LOAD INDEX, ,

Interdependence between Point Load Index, Compressive Strength and Crushing Resistance, 253 time, selective crushing could give considerable increase in yield [4] Most of the selective breakage and crushing technologies have already been tested in Estonia on kukersite [5, 6]...

Get Point Load Test - Microsoft Store

The operator can also define a custom equation for determination of the unconfined compressive strength from the point load strength index as calculated by the test The application will automatically graph the load versus equivalent core diameter and automatically calculate the unconfined compressive strength for the rock specimen...

RELATION BETWEEN UNIAXIAL COMPRESSIVE STRENGTH, ,

Pakistan Journal of Science (Vol 66 No 1 March, 2014) 60 RELATION BETWEEN UNIAXIAL COMPRESSIVE STRENGTH, POINT LOAD INDEX AND SONIC WAVE VELOCITY FOR DOLERITE...

THE UNIAXIAL COMPRESSIVE STRENGTH OF SOFT ROCK

replaced by a point load strength index test This test is simpler in procedures than that of the uniaxial compression test, and the test does not need necessarily cylindrical sampl A conversion factor is then applied to the point load strength index, I S(50), for estimating the uniaxial compressive strength ,...

echn(fl Notes - appsdticmil

Point Load Index and Unc onfined Comnressive Strength Data Base System Purpose The Point Load Index and Unconfined Compressive Strength Data Base System (PLUCS) was designed to store, retrieve, and compare rock test data This technical note describes the PLUCS and gives its ,...

Conversion of Point Load Test Results to Conventional ,

According to ASTM D5731-08, Uncorrected point load strength index (Is) is an indicator of strength Note 1 : L= Distance between contact points and nearest free face, and D e = equivalent core diameter [8] Fig 1 Load Configurations and Specimen Shape Requirement for (a) the Diametral Test, (b) the Axial Test (ASTM D5731-08, 2008) Since the ....

New correlations between uniaxial compressive strength and ,

Keywords: Basalt, Regression analysis, Point load strength index, Uniaxial compressive strength Introduction Uniaxial compressive strength (UCS) is an important property of rock Uniaxial compressive strength is widely used in the slope stability analysis and in the design of foundations and tunneling in rocks Uniaxial compressive strength is ....

Evaluation of the Point Load Test for Rock

ratio, it should be possible to estimate the unconfined compressive strength from the point load required for failure 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...

Correlation between Uniaxial Compressive Strength and ,

Correlation between Uniaxial Compressive Strength and Point Load Index for Salt-Range Rocks M Akram1 and M Z A Bakar2 1 2 Mining Engineering Department, University of Engineering & Technology, Lahore, Pakistan Geological Engineering Department, University of Engineering & Technology, Lahore, Pakistan...

USING THE POINT LOAD TEST TO DETERMINE THE UNIAXIAL ,

Point load testing is used to determine rock strength indexes in geotechnical practice The point load test apparatus and procedure enables economical testing of core or lump rock samples in either a field or laboratory setting In order to estimate uniaxial compressive strength, index-to-strength conversion factors are used...

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 estimatedThis test is very economical due to the simplicity of the apparatus and the minimal amount of required materials to execute...

AMERICAN SOCIETY FOR TESTING AND MATERIALS Reprinted ,

time and cost of compressive strength tests 52 The point load strength test is used as an index test for strength classification of rock materials The test results should not be used for design or analytical purpos 53 This test method is performed to determine the point load strength index (Is(50)) of rock specimens, and the point...

Standard Test Method for Determination of the Point Load ,

ASTM D5731-16, Standard Test Method for Determination of the Point Load Strength Index of Rock and Application to Rock Strength Classifications, ASTM International, West Conshohocken, PA, 2016, astmorg Back to Top...

Laboratory Testing and Interpretation of Rock Properties

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 ,...

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

Point load test Correlation Laboratory test Brazilian Traction Unconfined compres-sion strength Direct measurement Table 1 Methods for determining the unconfined compression strength, [4] The Point Load Test (PLT) allows us to determine the Point Load Resistance Index or Point Load Strength, (I s(50)) It is useful in classifying rocks by ....

Prediction of Uniaxial Compressive Strength Using Point ,

compressive strength and point load index as International society for rock mechanics Flat and smooth samples are prepared with length to diameter ratio of 2 and met the tolerance limits of 2 to 25 Figure 2 shows the schematic diagram of uniaxial compressive testing machine The point load index machine used for conducting...

Estimating thestrength ofrock materials - SAIMM

The point-load strength index is calculated astheratio oftheapplied load to the square ofthe core dia-meter The results are listed in Table III and plotted in Fig 1, from which itwill beclearthat there is a close correlation between the uniaxial compressive strength and thepoint-load strength index Therelationship isasfollows: uc=24 Is (1)...

uniaxial compressive strength of granite - diyafcin

Strength Properties of Rocks and Rock Masses University of between strain hardening and softening is called the unconfined compressive strength of the rock and is denoted as Co or Typical values of uniaxial strength (in MPa) for nine common rock types (after...

STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1 ,

STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1 INTRODUCTION 2 TESTING OF INTACT ROCK FOR STRENGTH 21 Uniaxial Compression 22 Point Load Testing 23 Uniaxial Tension 24 Indirect Tension Tests 25 Shear Tests 26 Confined Compression Tests (Triaxial Tests) , Strength anisotropy can also be assessed by using the point load index as ....

Correlation between Uniaxial Compressive Strength and ,

correlations between the uniaxial compressive strength and the corresponding values of the point load index Two hundred rock cores were drilled and used for the uniaxial compressive strength and point load index tests Results indicate the existence of two rock groups showing distinct behaviour in the context of this correlation...

Using the point load test to determine the uniaxial ,

Point load testing is used to determine rock strength indexes in geotechnical practice The point load test apparatus and procedure enables economical testing of core or lump rock samples in either a field or laboratory setting In order to estimate uniaxial compressive strength, index-to-strength conversion factors are used...

Correlation between Uniaxial Compressive Strength and ,

Broch and Franklin [5] reported that for 50 mm diameter cores the uniaxial compressive strength is approximately equal to 24 times the point load index They also developed a size correction chart so that core of various diameters could be used for strength determination...

PREDICTION OF UNCONFINED COMPRESSIVE STRENGTH OF ,

Study On Uniaxial Compressive Strength, Point Load Strength Index, Dynamic And Physical Properties Of Serpentinites From Central Greece: Test Results And Empirical Relations Eng Geol 108: 199–207 M Kohno, H Maeda 2012 Relationship Between Point Load Strength Index And Uniaxial Compressive Strength Of Hydrothermally Altered Soft Rocks...

IN-SITU CONCRETE COMPRESSIVE STRENGTH ASSESSMENT ,

in the field To estimate the compressive strength in one direction (uniaxial compression strength) are necessary to establish the conversion factor from the index to the compressive strength (ISRM, 1985) Richardson (1989) make a point load tests on concrete cylinder specimens were cast with varying diameters, namely...

relation between uniaxial compressive strength, point load ,

Key words: Uniaxial compressive strength, Sonic velocity, Point load index, Dolerite, Hadda formation INTRODUCTION Point Load Index: The point load index (PLI) is extensively used for the indirect estimation of UCS It can furnish similar data at a lower cost The ,...