• ASTM D7012

    Method C, uniaxial compressive strength of rock is used in many design formulas and is sometimes used as an index property to select the appropriate excavation technique. Deformation and strength of rock are known to be functions of confining pressure. Method A, triaxial compression test, is commonly used to simulate the stress conditions under which most underground rock masses exist.

    Get Price
  • cdc_9302_

    View cdc_9302_ from ECONOMICS 234 at Harvard University. USING THE POINT LOAD TEST TO DETERMINE THE UNIAXIAL COMPRESSIVE STRENGTH OF COAL MEASURE ROCK John Rusnak, Director of Geology Peabody

    Get Price
  • Estimation of Unconfined Uniaxial Compressive Strength ...

    compressive strength. [8] have used the Schmidt hammer to determine the surface hardness of natural rocks. [9] checked the point load index, RN values and E of gabbros and basalts, and obtained empirical relationships for gabbros and basalts. [10] estimated UCS using the slake durability and RN tests based on analysis of structural and

    Get Price
  • 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, indextostrength conversion factors are used. These factors have ...

    Get Price
  • Correlation between uniaxial strength and point load index ...

    Point Load Test (PLT) is practically used in geotechnical engineering to determine rock strength index. Despite that the PLT is fast, economical and simple in either field or laboratory, Uniaxial Compressive Test (UCT) is timeconsuming and expensive. UCS can be estimated using Point Load Index (PLI). So, implementation of correlation between results of PLT and UCT is of interest. In this ...

    Get Price
  • Estimating the geotechnical properties of heterogeneous ...

    before and after testing, should accompany the laboratory report since these enable the user to judge the validity of the test results. The uniaxial compressive strength of the intact rock samples can be estimated, with a reasonable level of accuracy, by multiplying the point load index I s by 24, where I s = P/D2. P is the load on the points

    Get Price
  • Point Load Test |

    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.

    Get Price
  • 2. Uniaxial compression and point load tests were |

    Determine the uniaxial compressive strength (UCS) and standard point load strength Iso of granite specimens. Discuss the results between the UCS and Iso Uniaxial Standard point load test compression Diametrical Irregular lump test Axial test test test 120 120 60 LxDxW=119x75x83 Specimen size (mm) Failure load (kN) 585

    Get Price
  • Estimate of Uniaxial Compressive Strength of ...

    index tests and uniaxial compressive strength (UCS) in hydrothermally altered soft rocks of the Upper Miocene, which are typical of the soft rock found in northeastern Hokkaido, Japan. Index tests were performed using point load testing machine and needle penetrometer with irregular lump specimens under forceddry, forcedwet, and naturalmoist states. The relationships between irregular ...

    Get Price
  • 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, indextostrength conversion factors are used. These factors have ...

    Get Price
  • 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 anisotropy index (Ia (50)). The anisotropy index represents the strength ...

    Get Price
  • Correlation between point load index and compressive ...

    The point load test is widely used to determine the uniaxial compressive strength indirectly because of its ease of testing simplicity of sample preparation and possible field appliion. Widely used correlations, between point load index and other geotechnical parameters exist. However, more experimental work helps to substantiate the existing correlations.

    Get Price
  • Scale Effect and Correlation between Uniaxial Compressive ...

    Determining the uniaxial compressive strength of intact rock is the primary objective of a geomechanical project, and a reliable estimate in the early phases saves time and costs for more sophistied laboratory tests. The problem is knowing which of the correlations between the resistance to uniaxial compression and point load index are reliable, those that cover one or several types of .

    Get Price
  • The pointload strength test for concrete cores | Magazine ...

     · For concrete strengths greater than 20 N/mm 2 a linear relationship between core pointload index and cube compressive strength was observed, and the variability of the pointload strengths compared favourably with values reported for compressive testing of cores. The advantages of both the pointload test and the uniaxial compression test for cores are discussed, and it is .

    Get Price
  • 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, indextostrength conversion factors are used. These factors have been proposed by various researchers and are ...

    Get Price
  • Rock mass properties

    ** Point load tests on rocks with a uniaxial compressive strength below 25 MPa are likely to yield highly ambiguous results. Table 3: ... be noted that the uniaxial compressive strength of this material varies by a factor of about 5, depending upon the direction of loading. 0 10 20 30 40 50 60 70 80 90 Angle of schistosity to loading direction 0 10 20 30 40 50 60 70 80 90 100 C o m p r e s s i ...

    Get Price
  • Uniaxial Compression Test

    Uniaxial Compressive Strength Tests Point Load Index GCTS Device Roctest Equipment 10 Point Load Testing. 11 Point Load Index Quick evaluation for uniaxial strength (field or lab setup) ASTM D 5731 procedures Little sample preparation (cores, pieces) Measure force (P) to crunch intact rock specimen Point Load Index: I s = P/d e2 where d e = equivalent core diameter .

    Get Price
  • Correlation between point load index and uniaxial ...

    Keywords – Rock, point load test, uniaxial compression strength, correlation. I. INTRODUCTION Uniaxial compressive strength is an incontrovertibly important geotechnical property that is mostly preferred in rock engineering problems for classifiion. This value of strength represents the maximum limit of the actual rock masses and dependent on its size, cracks and fissures [1]. In a ...

    Get Price
  • Correlation between uniaxial compressive strength and ...

     · Two hundred rock cores were drilled and used for the uniaxial compressive strength and point load index tests. Results indie the existence of two rock groups showing distinct behaviour in the context of this correlation. The first group of rocks, Group A, consists of hard Jutana Sandstone, Baghanwala Sandstone, Siltstone, Sakessar Massive Limestone, Khewra Sandstone and Dolomite. .

    Get Price
  • Predicting Uniaxial Compressive Strength by Point Load ...

     · K. T. Chau R. H. C. Wong (1996) ArticleTitle Uniaxial compressive strength and point load strength Int. J. Rock Mech. Min. Sci. Geomech. Abstr. 33 183–188 Occurrence Handle /(95)000569

    Get Price
  • Estimating Unconfined Compressive Strength of Sedimentary ...

    [4] relating uniaxial compression and the point load tests on a variety of rocks. They found the following linear regression model to correlate the UCS and I s(50). qI u = + s(50) 3. The UCS Test There are three types of compressive strength tests of rocks as defined by Jaegar l. [5]; the first is the UCS et a

    Get Price
  • Correlation between point load strength index and uniaxial ...

    Abstract. Strength is an important engineering parameter for determining excavatability and load bearing characteristics of rock. Because of the low test cost, it is desirable to identify a multiplier relating the Point Load Test Strength Index (I s(50)) with strength derived using the more expensive Uniaxial Compressive Strength from eight test loions on the Sunshine Coast ...

    Get Price
  • [PDF] 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, indextostrength conversion factors are used. These factors have been proposed by various researchers and are ...

    Get Price
  • 11 Rock mass properties

    the uniaxial compressive strength ... ** Point load tests on rocks with a uniaxial compressive strength below 25 MPa are likely to yield highly ambiguous results. Intact rock properties 167 Table : Values of the constant mi for intact rock, by rock group. Note that values in parenthesis are estimates. Rock Class Group Texture type Coarse Medium Fine Very fine Clastic Conglomerate (22 ...

    Get Price
  • Correlation between Uniaxial Compressive Strength and ...

    Uniaxial Compressive Strength Test Results The mean values of uniaxial compressive strength of the tested rocks are listed in Table 2. The strength values range from a low of MPa for Marl to a high of MPa for Sakessar Massive Limestone. The coefficient of variation ranges from % to %. Point Load Test Results

    Get Price