With the depletion of shallow mineral resources the sustainable development and utilization of deep mineral resources will become a normal activity As a type of clean energy to promote sustainable development gas in deep coal seams has attracted wide attention A better understanding of the permeability evolution induced by mining disturbance and the geological environment is of great
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Get PriceAbstract 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
Get PriceThe 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 These factors have been proposed by various researchers and are dependent upon rock type
Get PriceDigital Point Load Tester Point Load Strength Test Originally developed at Imperial College London the apparatus comprises a two column fixed crosshead frame and a hand operated hydraulic jack Pressure applied by the jack extends the piston carrying the lower conical point
Get Priceseveral evaluations can be made from the results of the point load test such as determining uniaxial compressive and tensile strengths indirectly intact rock classification based on plt intact
Get PriceUsed for setting the optimum stroke conditions in the test fixture various installation heights can be achieved by combining test probes and receptacles Show more Show less Spring loaded test probe GKS 075 214 050 A 2800 Item GKS 075 0053
Get PriceMar 5 2021A point load tester is a simple press to test for rock strength During the core sample test the gauge records the maximum point load in kN The strength index obtained can be correlated with the uniaxial compressive strength kN of the rock tested Point load tester deployment By design point load testers are compact and portable
Get PriceBroch 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
Get PriceThe portable point load tester provides an index for the strength classification of hard rocks and allows for a quick non expensive on site evaluation of hard rock strength A sample of rock is mounted between two pointed platens Pressure is then applied until failure breakage of the sample occurs
Get PriceThe 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 This study involved the extensive load frame and point load testing of coal measure rocks in six
Get PricePoint Load Testing Series 6000 The HMA Geotechnical Strength Testing Point Load Testers are designed to conveniently measure the point load strength of drill core and irregular rock samples
Get PriceDetails of the test pile construction 60 MN axial load capacity O cell test layout location and instrumentation arrangement to confirm the adequacy of design are also described The design of the multilevel O cell test pile assembly instrumentation testing sequence and summary of the results are provided Interpretation of the data allowed
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Get PriceThe upper 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 Pressure is indicated directly on the digital readout unit Loads up to 55 kN can be applied to specimens as large as 101 6 mm in diameter
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Get PriceThe point load test apparatus and procedure enables economical testing of core or lump rock samples in either a field or laboratory setting In order toestimate uniaxial compressive strength index to strength conversion factors are used These factors have been proposed by various researchers and are dependent upon rock type
Get PriceThe point load strength test E Broch J A Franklin https //doi org/10 1016/0148 9062 72 90030 7 Get rights and content An index test for strength classification of rock materials is described The test uses portable equipment Specimens require no machining and can take the form of either rock core or irregular lumps
Get PriceThe point load test has often been reported as an indirect measure of compressive strength It has been used widely in practice due to easy testing the simplicity of specimen preparation and possible field applications 2024 studied the UCS/I s ratio using the data from 48 different rocks and found two separate trends one for the Coal
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Get PriceDescription 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
Get PriceGeology 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
Get PriceThe PLT has been of coal measure rocks in six states More than 10 000 used in geotechnical analysis for over thirty years ISRM individual test results from 908 distinct rock units were used 1985 The PLT involves the compressing of a rock sample in the study
Get PriceThe ISRM [ 3] suggests determining the σc by multiplying the Is 50 by a factor F that varies between 20 and 25 when the rock does not present anisotropy as shown in Equation 32 where de is the equivalent diameter mm P is the failure load kN k2 is the coefficient of the scale factor and σc is the uniaxial compressive strength MPa
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