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

basic types of point load tests: axial, diametral, and block or lump. The axial and diametral tests are conducted on rock core samples. In the axial test, the core is loaded parallel to the longitudinal axis of the core, and this test is most comparable to a UCS test. The point load test allows the determination of the

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

PDF | 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 ...

## Unconfined Compressive Strength Test UTA

To determine the unconfined compressive strength (q u) of the soil ... (look for UCS test in the menu) ... the strain versus load plot Triaxial Setup Placing the specimen Placing the triaxial cell Real time data . Interpretation of data for UCS test The test results are saved as an EXCEL sheet and contain the load (in kgforce) and strain in ...

## CORRELATION BETWEEN UNIAXIAL COMPRESSIVE STRENGTH …

compressive strength (UCS) to the pointload index strength (Is 50) reported by various authors 18 Dimension of the limestone and granite samples for uniaxial compressive test (UCT) 25 Dimension of the limestone and granite for pointload index strength test 35 Results of pointload index strength test for limestone 39

## Prediction of the uniaxial compressive strength and ...

It is commonly used in practice due to the ease of testing, simplicity of specimen preparation and possible field application. ISRM suggested that the ratio between uniaxial compressive strength (UCS) and point load index (I s(50)) varies between 20 and 25, although researchers have found various ratio which is depend on rock types.

## RELATION BETWEEN UNIAXIAL COMPRESSIVE STRENGTH, POINT LOAD ...

On the other relationship amongst UCS, PLI (Is (50)) and rock core hand, indirect testing techniques such as point load test diameter (D): and sonic pulse velocity for the estimation of UCS of UCS = (14 + D) Is (50) (4) rocks require little or no sample preparation, very less Cargill and Shakoor (1990) conducted standard UCS and ...

## STANDARD OPERATING PROCEDURE No. 77 POINT LOAD …

STANDARD OPERATING PROCEDURE No. 77 POINT LOAD STRENGTH TEST REVISION LOG Revision Number Description Date 77v0 Original SOP – Vanessa Candida Viterbo 06/28/2005 77v1 First edits LMK, changed SOP from 75 to 77 because 75 is the Specific Gravity SOP 6/28/05 Sent 77v1 to Jack Hamilton to post on Utah website 8/19/05

## Evaluation of the Point Load Test for Rock

A commercially available point load test apparatus was purchased and used in a testing program on NX cores from the major types of sedimentary rock found in Missouri. Point load testing was performed in both axial and diametral orientations with unconfined compression tests performed for correlation.

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

## INTERDEPENDENCE BETWEEN POINT LOAD INDEX, …

The Point Load Test index (PLTI) was determined for rock samples obtained from the three studied drill holes, 15–30 samples from each. 34 samples from one drill hole were tested for UCS.

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

A study was conducted to compare all of the point load test (PLT) methods and their usefulness in practical applications. The study presented the point load strength index (PLSI) obtained by three ...

## Estimating the Intact Rock Strength of a Rock Mass by ...

Many alternatives have been invented for UCS testing. Notable: the Point Load Test or hammer tests. The same problems as listed above also apply to the PLS test. The inclusion of discontinuities in the rock will cause a PLS value tested parallel to this discontinuity to be considerably lower than if …

## Correlation Between Point Load Index And Very Low Uniaxial ...

UCS/mean PLT. INTRODUCTION . 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 some Iraqi rocks using

## Utilizing the strength conversion factor in the estimation ...

The strength conversion factor (k) is the ratio between the uniaxial compressive strength (UCS) and the point load index (PLI).It has been used to estimate the UCS from the PLI since the 1960s. Many researchers have investigated the relationship between UCS and PLI for various rock types of different geological origins, such as igneous, sedimentary, and metamorphic rocks.

## 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 samples. A conversion factor is then applied to the point load strength index, I S(50), for estimating the uniaxial compressive strength (UCS).

## The determination of uniaxial compressive strength from ...

According to Broch and Franklin (1972), the point load strength test results are less scattered than the UCS test results. Bieniawski (1975) states just the opposite. In this study, the I s test results are less scattered than the UCS test results, supporting Broch and Franklin's statement.

## Correlation UCS and Point Load Index | Coefficient Of ...

Jul 01, 2007· The point load test was performed in accordance with the procedure described by Broch and Franklin [5] and standardized by ISRM [14]. Digital Point Load test apparatus, model 45D0550/D, made by Controls, England was used for Point Load testing of the rock samples (Figure 3). The core samples were diametrically loaded during the test.

## Point Load Test on MetaSedimentary Rocks and Correlation ...

Aug 21, 2012· The point load test has been considered as a cheap and useful testing method to estimate the strengths of rocks due to its ease of testing, simplicity of specimen preparation, ... Point load test Metasedimentary rock Uniaxial compressive strength (UCS) ...

## Pointload strength: An index for classification of rock ...

Abstract. Pointload 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.

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

Point Load Testing In order to overcome many of the problems associated with the unconfined compression test, 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 setup is shown in Figure 1.

## AMERICAN SOCIETY FOR TESTING AND MATERIALS …

such as the point load test can be used in the ﬁeld to reduce the time and cost of compressive strength tests. 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 purposes. This test method is performed to determine the point

## The estimation of uniaxial compressive strength conversion ...

The point load (PL) test is generally used for estimation of uniaxial compressive strength (UCS) of rocks because of its economic advantages and simplicity in testing. If the PL index of a specimen is known, the UCS can be estimated using conversion factors. Several conversion factors have been proposed by various researchers and they are […]

## Correlation between Uniaxial Compressive Strength and ...

The procedure for measuring this rock strength has been standardized by both the International Society for Rock Mechanics [1] and American Society for Testing and Materials [2]. The method is time consuming and expensive. Indirect tests such as Point Load Index (Is(50)) are used to predict the UCS.

## Estimating Unconfined Compressive Strength of …

UCS P d= u (1) 4. Point Load Test The ASTMD573108 [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 insitu tests of which the point load test was one of them.

## 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 ...

## relation between uniaxial compressive strength, point load ...

Direct UCS test was executed on rock cores with approximate length to diameter ratio :1 (Figure 1). The cores were pressed to fracture, at a very slow rate (to avoid dynamic loading) using a 200 ton Universal Testing Machine. Point load test was performed by loading cores on two pointed platens until failure occured (Figure 2).

## Correlation between Uniaxial Compressive Strength and ...

tolerance limits as specified in the suggested test procedure. The point load test was performed in accordance with the procedure described by Broch and Franklin [5] and standardized by ISRM [14]. Digital Point Load test apparatus, model 45D0550/D, made by Controls, England was used for Point Load testing of the rock samples (Figure 3).

## Rock Strength Testing | Alliance Geotechnical

UCS or Point Load Testing for Design or Verification UCS – The capacity of a material to withstand axially directed crushing forces. When the limit of comprehensive strength is reached, specimens fail and are crushed. The UCS itself is the maximum force that a specimen can withstand before failure occurs. Point Load Test – Used […]

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

In contrary to the UCS and estimated values of UCS were compared to the the ITS, the Axial Point Load (APL) and the measured values obtained from the running tests Diametral Point Load (DPL) test methods are on samples from 48 different rock types and the simpler and run quickly.

## Geosciences | Free FullText | The Influence of Pre ...

The ITS procedure was a bit more laborious compared to the point load test and the UCS. The specimen sat in a handmade jig to stop the sample from rolling and had to be recentered to the axis of the sample before every test (Figure 3B).

## The use of point load test for Dubai weak calcareous ...

Alternatively, the UCS may be estimated using the point load test, which is conducted on specimens in the form of cores, blocks or irregular pieces with a diameter of 30 mm and 85 mm, respectively (ASTM, 2008b). The point load test is especially useful when core specimens cannot be extracted from fractured or weathered rock masses.