4.2 Point Load Test Results The results of the point load test are given in Table 3. The point load strength index values range from 0.36 MPa for the Jutana Sandstone to 5.24 MPa for the Dandot Sandstone. The coefficient of variation ranges from 5.3 % for Dandot Sandstone to 60.7% for Jutana Dolomite. Broch and Franklin [5] report that the

Get More1.5 This test method does not cover which type of specimen should be tested or whether anisotropic factors should be considered. The specifics of the point load test program need to be developed prior to testing and possibly even before sampling.

Get MoreUCS P d= u (1) 4. Point Load Test The ASTM-D 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.

Get MoreAppendix F Point load test resu33 – Gerringong to Bomaderry Princes Highway Upgrade Preliminary Geotechnical Report – October 2007 Page f. GEOTUNAN02580AA Point Load Strength Index Test Results 1 1 MAUNSELL / AECOM UNANDERRA ROADS AND TRAFFIC AUTHORITY 13/4/07 GEOTECH INVESTIGATION - PRINCES HWY, PHASE 1 CA

Get MoreThe point load test provides a fast and economic method for evaluating the UCS of rock specimens. The point load strength index ( I s50 ) is empirically correlated to the UCS. There is a plethora of correlations for estimating the UCS from the point load strength index, as summarized in Table 1 .

Get MoreOverall determining the strength of a rock through point load test yields the important values such as UCS which was over 250Mpa and Is of 10.54MPa highlighting that the rock is extremely strong and combined with the visual inspection of grey coarse grained …

Get Morecompression 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). Broch and Franklin [17] suggested a conversion factor of 24 as a correlation between UCS …

Get Morebasic 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 …

Get MoreInterpretation of data for UCS test The test results are saved as an EXCEL sheet and contain the load (in kg-force) and strain in (mm). This section explains how to apply the area correction and interpret the test …

Get MoreThe 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.

Get Morecluding Schmidt hammer test, point load test, impact strength test, sonic velocity. Fener et al., (2005) tried to relate UCS with the Schmidt hammer test, the point load test and the impact strength test for 144 samples, but found no good correlations with either. The …

Get MoreThe 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.

Get Morepredictability of the UCS and BTS of rocks from the IHI obtained using a point load apparatus. For this reason, 46 different rock types, including igneous, metamorphic, and sedimentary rocks were tested in the laboratory. The test results were statistically analysed and the UCS and BTS values were correlated with the corresponding IHI values. In

Get MoreThe testing machine consists of a loading system (for measuring the load, P required to break the specimen) and a system for measuring the distance D between the two platens

Get MoreThree 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 the second case.

Get MoreRock units with at least 3 UCS and 3 PLT results were suite of point load tests to a single UCS test. With such an selected for inclusion in the data base. The mean UCS. 1985). expressed as a fraction of the mean UCS. IN.

Get More(UCS) and the point load strength index (I s.50) were developed. It was observed that other than the customary linear relations and power function between UCS and I s.50, a bilinear relation best fitted the laboratory data. Keywords: Basalt, Regression analysis, Point load strength index, Uniaxial compressive strength Introduction

Get MorePoint Load Testing Guidance Unconfined Compressive Strength (UCS) is important when estimating bearing resistance and skin friction in rock. Obtaining rock core specimens with a length to dimeter ratio of 2:1 is sometimes not possible for our weaker rocks.

Get Morein the laboratory, or indirectly from point-load strength test (see Section 1.4.2). The tests should be carried out according to the methods recommended by the ISRM (1972).

Get MoreUCS - Point Load - Triaxial - Cerchar - Sound velocity - Brazilian - Slake - Porosity - Density - etc. ... The sample should be sufficient to permit 5 test scratches (10 mm) at least 5 mm from the edge of the rock surface and each test should be 5 mm apart. If it is a core, the diameter should be less than 76 mm and length less than 150 mm ...

Get MoreBroch and Franklin [5] report that the point load test results are less scattered as compared to the UCS test results. 3 Analysis of UCS and Is(50) Results By plotting UCS against Is(50) it was found that there are two major rock groups showing distinct trend (Figure 4).

Get MorePoint load index test needs less sample preparation, easy to handle and quick test while comparing with uniaxial compressive test. Lot of researchers comes out with a lot of correlations between uniaxial compressive strength and point load index for intact rocks. ... (UCS) takes more time & cost on comparing with point load index [I50]. Easy ...

Get MoreThe 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 ...

Get MoreTesting Carried out in accordance with International Society for Rock Mechanics (ISRM) Standards and other recognised standards. Compressive Strength of Rock cores. Diamond core drilling for provision of test cores; Density of concrete specimen

Get MoreThe 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 availability to the field.

Get MoreThe 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 …

Get MoreThe 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, and possible field application. An underground oil storage rock cavern is under construction in Singapore.

Get Morecluding Schmidt hammer test, point load test, impact strength test, sonic velocity. Fener et al., (2005) tried to relate UCS with the Schmidt hammer test, the point load test and the impact strength test for 144 samples, but found no good correlations with either. The …

Get MoreRead "Point Load Test on Meta-Sedimentary Rocks and Correlation to UCS and BTS, Rock Mechanics and Rock Engineering" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

Get MoreUCS P d= u (1) 4. Point Load Test The ASTM-D 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.

Get Morecompression 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). Broch and Franklin [17] suggested a conversion factor of 24 as a correlation between UCS …

Get MoreBroch and Franklin [5] report that the point load test results are less scattered as compared to the UCS test results.36 MPa for the Jutana Sandstone to 5.17 10.3 11.46 1.36 0.24 25.00 28.7 95% Confidence Intervals (MPa) 36.

Get MoreThe testing machine consists of a loading system (for measuring the load, P required to break the specimen) and a system for measuring the distance D between the two platens

Get MorePoint load test, Unconfined Compressive Strength (UCS) and Pulse Wave Velocity (V p ) were used for testing several rock samples with different diameters. The predicted empirical correlations based on various test results indicate that the UCS could be

Get MorePoint Load Testing Guidance Unconfined Compressive Strength (UCS) is important when estimating bearing resistance and skin friction in rock. Obtaining rock core specimens with a length to dimeter ratio of 2:1 is sometimes not possible for our weaker rocks.

Get MoreStrength 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 (Is(50)) with strength derived using the more expensive Uniaxial Compressive Strength Test.

Get More(UCS) and the point load strength index (I s.50) were developed. It was observed that other than the customary linear relations and power function between UCS and I s.50, a bilinear relation best fitted the laboratory data. Keywords: Basalt, Regression analysis, Point load strength index, Uniaxial compressive strength Introduction

Get More2.2 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 set-up is shown in Figure 1.

Get MoreThe 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.

Get MoreThe 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.

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