Point Load Index Test
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. 5.2 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. 5.3 This test method is performed to determine the point
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(PDF) The point-load strength test
The point load strength Index (PLSI) test is intended as an index test for the strength classification of rock material (Broch and Franklin, 1972). Irregular lumps with their width and thickness ...
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Characterising intact rock strength using field estimates and the point
Undertaking point load index testing in the field is a useful tool that can provide data to augment field strength estimates and laboratory test data. Field point load index test data can be ...
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Determination of the Uniaxial Compressive …
Application of the point load index test to strength determination of rock and proposals for a new size-correction chart. In: Proceedings of the 21 st US Symposium on Rock Mechanics (USRMS): May ...
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STRENGTH PROPERTIES OF ROCKS AND ROCK …
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
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Applicability of Point Load Test to Estimate Unconfined
Abstract. Point load test (PLT) is a widely used indirect method to estimate the unconfined compressive strength (UCS) of rocks in geotechnical practice. The test consists of loading a rock specimen between two conical platens until failure occurs in order to calculate the point load strength index (Is(50)). Its main advantages are the simplicity of the test, the …
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STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES
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 …
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Uniaxial compressive strength and point load index of …
The testing procedure for point load strength (PLS) test and uniaxial compressive strength (UCS) were done according to ASTM Standards. 2, 34 The loading rate for UCS tests is controlled such that it typically takes 2–15 min, while the PLS test takes about 10–60 s. For irregular lump point load test, both the initial D and final D' values were measured and used …
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Investigating the Accuracy of Specimen Shape for Point …
practitioner, and test apparatus used can aect the accuracy of the point load index test. This study investigated the eect of four dierent specimen shapes used in point load index test (diametral, axial, block, and irregular lump tests) in predicting the uniaxial compressive strength. The rock samples were tested using four test procedures ...
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IS 8764 (1998): Method of determination of point load …
'indirect tensile' test, but this is largely irrelevant to its primary role in rock classification and strength characterization. Is(50) is approximately 0.80 times the uniaxial tensile or Brazilian …
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Classification and modification of slake durability test for …
Unlike uniaxial compressive strength, point load index test can also be applied to irregular specimens, allowing the user to easily determine the rock strength. Ten irregular shaped specimens representing each road cut were used in this test. The average values of the test results were assigned as the point load strength of each road cut.
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Point-Load Strength Test | ELE International
Digital Point-Load Test Apparatus. Originally developed at Imperial College, London, the apparatus comprises a two-column fixed crosshead frame and a hand operated hydraulic jack. ... point is fixed to the crosshead with a scale mounted on the frame to provide specimen diameter information for use in point-load strength index calculations ...
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A Comparative Study of Point Load Index Test Procedures in …
The point load index (PLI) test is one of the most frequently applied indirect methods in predicting the uniaxial compressive strength (UCS). Depending on the rock sample …
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Point Load Test
Introduction. Point Load (PL) is a test that aims at characterizing rock materials in terms of strength. It is an index test, meaning that it can be performed relatively quickly and without the necessity of sophisticated equipment to provide important data on …
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(PDF) POINTLOAD TEST
A single 'point-load strength index' can be obtained whatever the shape of specimen, provided that this shape is maintained within prescribed limits and that a size correction is made.
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Using the Point Load Test to Analyze the Strength …
The point load test is considered to be a convenient and inexpensive method or index test for rock classification and strength estimation due to its ease of testing, the simplicity of specimen preparation, and the possible field applications (Kahraman and Gunaydin 2009; Basu and Kamran 2010; Singh et al. 1989; Ajalloeian and Lashkaripour 2000 ...
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The Point Load Test
Abstract 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 … Expand. 24. 1 Excerpt; Save. The equivalent core diameter method of size and shape correction in point load testing.
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Point load (docx)
You are required to conduct Point Load testing. 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 …
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The point-load strength test
APPENDIX Suggested Method fi~r Determining the Point-Load Strength Index* Scope 1. This test is intended to measure the strength of rock specimens when subjected to concentrated loads applied through a pair of conical platens. Specimens may take the form of either rock core (the "diametral' and 'axial' point-load tests) or of irregular lumps ...
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Point load testing to more effectively measure bedrock …
Point load testing, which has been used in engineering for decades, is emerging as a ... to calculate the rock strength index, which is easily corrected for variations in sample
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Point load test vs. uniaxial compressive strength test.
The Point load testing is used to determine rock strength indexes in scientific researches and geotechnical practices. The apparatus of point load test and its procedure enables economical testing ...
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Standard Test Method for Determination of the Point Load Strength Index
Scope1.1 This test method covers the guidelines, requirements, and procedures for determining the point load strength index of rock. Specimens in the form of rock cores, blocks, or irregular lumps can be tested by this test method. ... This is an index test and is intended to be used to classify and characterize rock.
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Point load testing to more effectively measure bedrock …
Point load testing, which has been used in engineering for decades, is emerging as a viable tool for bedrock strength testing. This method measures rock strength by breaking …
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Case study: using the point load test to estimate rock …
Rock strength is one of the most important parameters in geotechnical engineering. During excavation using a tunnel boring machine (TBM), a rapid and effective method to estimate rock strength is needed. The TBM muck produced during excavation contains blocky fragments which are suitable for a point load test (PLT). To use the PLT on blocky fragments to …
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USING THE POINT LOAD TEST TO DETERMINE THE …
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 …
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A numerical integrated approach for the estimation of the …
For this test, the point-load strength index (I s) is determined by using: (5) I S = P D e 2 where P is the peak load measured during the test; and D e is the equivalent distance between two pointers for diametral tests and other states (D e 2 = 4WD/π where W is the smallest specimen width perpendicular to the loading direction, and D is the ...
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(DOC) LAPORAN BAB III Point Load Test
LAPORAN BAB III Point Load Test ... Dari pengujian ini didapat: Is = Dimana : Is = Point load strength index ( Index Franklin ) P = Beban maksimum sampai percontoh pecah D = Jarak antara dua konus penekan Hubung anantara …
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Application of the Point Load Index Test to Strength …
Application of the Point Load Index Test to Strength Determination of Rock And Proposals For a New Size-Correction Chart @inproceedings{Hassani1980ApplicationOT, title={Application of the Point Load Index Test to Strength Determination of Rock And Proposals For a New Size-Correction Chart}, author={Ferri Hassani and Malcolm Scoble and B. N ...
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Point load testing to more effectively measure bedrock strength …
Point load testing, which has been used in engineering for decades, is emerging as a viable tool for bedrock strength testing. This method measures rock strength by breaking centimeter-scale ...
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Point Load Tester | HMA Group Geotechnical | GSA
The Model 6510 Point Load Tester is a portable machine suitable for use in the field or laboratory to determine the point load strength index of rocks specimens. Based on a two-column loading frame, the Point Load Tester uses a hand operated hydraulic jack for load Application, and a stain-gauged load cell with digital readout for load monitoring.
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