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406.2 Point Load Test. To obtain the unconfined compressive strength (UCS) from point load testing (PLT) a conversion factor is commonly used; UCS = conversion factor * I s.ODOT research (Shakoor and Admassu, 2010) has found that for Ohio bedrock use a conversion factor of 24 for competent rocks (sandstones and limestones) and 12 for incompetent rocks (shales …
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Point Load Test on Meta-Sedimentary Rocks and Correlation to UCS …
where k is the index-to-strength conversion factor. Besides the y = ax form, the y = ax + b form was also experimentally confirmed by some researchers (Kahraman and Gunaydin 2009; Basu and Kamran 2010; Gunsallus and Kulhawy 1984).An exponential form of y = ax b was also reported by Grasso et al. ().A prediction equation similar to Eq. can be used to correlate …
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Estimation of the strength of Nubian sandstone formation …
developed with a UCS to PLT Is(50) conversion factor of 10.18 and may be applied to e stimate the strength of the Sudanese sandstone formation. The developed correlation is in good agreement with few of the many methods published for similar rock types which indicates that large errors may result in from applying an inappropriate UCS prediction ...
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Correlation between uniaxial compressive strength and point load
The Is(50) value is known to correlate well with UCS. Various studies have come out with correlation between UCS and Is(50) . It is found that the index-to-strength conversion factors are rock dependent. This study presents the correlation between UCS and Is(50) of granite rock samples originating from a site located at Seremban, Negeri Sembilan.
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An assessment on the correlations between uniaxial
Point load index (Is) has been commonly used for predicting uniaxial compressive strength of intact rocks (UCS) because Is is easy and quick test performed on lump specimens. For this reason, many empirical equations in the literature to estimate the uniaxial compressive strength from the point load index have been proposed for the last five decades. In this study, …
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Microwave pre-conditioning of granite and concrete and the …
Furthermore, these results also show that the conversion factor to convert a PLI to a UCS value can vary for both concrete and granite samples by up to , depending on the irradiation time and heating (Fig. 10 b). Therefore, a fixed conversion factor for PLI to UCS, as various approaches summarized in Ref. 84 suggest, seems even more ...
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Microwave pre-conditioning of granite and concrete and the …
Furthermore, these results also show that the conversion factor to convert a PLI to a UCS value can vary for both concrete and granite samples by up to , depending on the …
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Equations correlating the UCS to the point load index
The findings indicate that using the conversion factor (k) recommended by ISRM to predict the UCS of rocks may significantly underestimate the actual strength of rocks in intricate mining ...
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Conversion relationship between Is(50) and UCS of sandstone
At present, there are three main conversion relational function between sandstone I s(50) and UCS: the zero intercept linear function, the non-zero intercept linear function and the power function ...
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Predictive model for uniaxial compressive strength for Grade III
Uniaxial compressive strength (UCS) for rocks plays a vital role in both preliminary and final design stages of rock and geotechnical engineering projects such as dam, rock mass excavation, tunnel, slope stability and foundation of infrastructures (Bieniawski, Z.T., 1975, Cargill, J.S. and Shakoor, A., 1990).Besides, UCS is also an important parameter to assess rock …
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COMPRESSIVE STRENGTH CONVERSION FACTORS OF …
Thus, conversion factors ranging from 0.8 to 0.9 are suggested to convert the cubic compressive strength to cylindrical compressive strength [52]. When the cubic compressive strength ( f c,cube ...
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(PDF) A preliminary study on the conversion factor used in the
The UCS–BPI conversion factor for this correlation is 5.1. In this study, the relation between UCS and BPI was investigated for pyroclastic rocks. ... tensile strengths of granite, schist and ...
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Optimization of UCS testing of limestone rock
Standard. From the numbers indicated in the Standard, a general conversion factor of 0.75 may be inferred to correct H/D = 1 results to equivalent H/D= 2 results. For lower values of compressive strength (0.4 to 8 MPa) the conversion factor varies between 0.75 and 0.83. The Standard does not indicate any correction for the diameter per se.
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INTERNATIONAL SOCIETY FOR SOIL MECHANICS AND …
UCS/PLI ratio of 11 for soft rocks (R2 = 0.4) in Brisbane, whereas a ratio of 23 is the most common ratio quoted in the international literature. A UCS to Young's modulus conversion factor in the range of 200 to 500 ( & Miller, 1966) is typically ap-plied to approximate the Young's modulus from UCS.
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Point Load Test on Meta-Sedimentary Rocks and Correlation …
UCS ¼ kI sð50Þ ð2Þ where k is the index-to-strength conversion factor. Besides the y = ax form, the y = ax ? b form was also experi-mentally confirmed by some researchers (Kahraman and
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Relation between UCS and I s(50) for Group A Rocks
The uniaxial compressive strength (UCS) is an important factor in the design and construction of surface and underground structures. However, the method employed to measure UCS is time consuming ...
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A numerical integrated approach for the estimation of the uniaxial
The experimental setup and failure pattern of the granite samples under the uniaxial compression tests are given in Fig. 4 e and f, and the granite specimens failed with distinct conjugate diagonal macroscopic fracture surfaces. Five compression tests are conducted to yield every UCS result for the rocks listed in Table 2.
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Uni-Axial Compression Strength – Point Load Index …
Brock and Franklin (1972) and Bieniawski (1975) had found that the uni-axial compression strength (UCS) can be estimated from the point load index using a correlation factor of 24 …
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Unconfined Compression Test
Table 2: Typical values of Uniaxial Compressive Strength for a various number of rocks (from Attewell & Farmer 1976). References. ASTM D7012-14e1, (2014).Standard Test Methods for Compressive Strength and Elastic Moduli of Intact Rock Core Specimens under Varying States of Stress and Temperatures, ASTM International, West Conshohocken, PA.
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(DOC) Linking Point Load Tests to UCS and ITS Results
The linear regression analysis results which consists conversion factor and correlation coefficient for each rock type are presented in Table 2. Results and Discussion Having studied the UCS versus PLA graphs and ITS versus PLD graphs for different rocks it becomes quite clear that, the conversion factors are different for different rock types.
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Average values from tests of rock samples
Rock types investigated are granite collected from Tumpat, Kelantan and limestone from Pandan Indah, Kuala Lumpur. The samples of granite and limestone are in fresh state (grade 1). …
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The estimation of uniaxial compressive strength conversion factor …
23, [70][71][72][73][74][75] Although the ISRM suggested that the conversion factor between the UCS and I S (50) varies between 20 and 25 7, numerous researchers have shown that the factor has a ...
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USING THE POINT LOAD TEST TO DETERMINE THE …
relationship between UCS and the point load strength could be expressed as: UCS = (K) Is50 = 24 Is50 (2) Where K is the "conversion factor." Subsequent studies found that K=24 was not as universal as had been hoped, and that instead there appeared to be a broad range of conversion factors. Table 1 summarizes published results obtained for ...
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Estimation of uniaxial compressive strength of rock materials by …
From the literature, it is evident that for different rock types with specific geology, different conversion factors are to be used to predict UCS from Is (50). The Schmidt rebound …
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Correlation between uniaxial strength and point load index of rocks
Kaya and Karaman (2016) obtained conversion factors of PLI to UCS to the tune of 12. 98, 17.68, and 15.32 for pyroclastic, volcanic, and plutonic igneous rocks, 18.55 and 13.51 for chemical and ...
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The determination of uniaxial compressive strength from point …
They stated that there was no single conversion factor applicable to the full range of strengths in rock materials for the linear regression model and established different conversion factors passing through the origin for three separate ... (2012) performed the UCS and I s tests on coarse granite, fine granite and marble samples at different ...
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-Validation of predicted equations of UCS from P …
A conversion factor of carbonate rocks in the linear regression without intercept for UCS–PLI, UCS–BTS, UCS–SHR, and UCS-E was observed as 14.32, 7.26, 1.71, and 3.52, respectively.
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(PDF) Point load test on schistose rocks and its applicability in
Using graphical and mathematical relations, hips between the obser'~ed and estimated tICS and ls values, a conversion factor of 16 is obtained for estimating uniaxinl (unconfincdl compressixe strengtb ',';dues from point load strength resulb, A nomogram for computing point-load strength index and a system for the classification of rock material ...
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IOP Conference Series: Earth and Environmental Science …
the correlation between UCS and Is(50) of the Penang Island granite samples. GEOTROPIKA & ICHITRA 2021 IOP Conf. Series: Earth and Environmental Science971 (2022) 012025 IOP Publishing ... (50) values with UCS values. From this, the correlation factor, (k) is obtained. Many studies had produced correlation between these two parameters for ...
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Predicting Uniaxial Compression Strength (UCS) Using Bulk
The result for bulk density and UCS test for granite and limestone are listed in Tables 1 and 2.The bulk density value range from as low as 2.46 g/cm 3 to a high of 2.59 g/cm 3 for granite and between 2.48 to 2.68 g/cm 3 for limestone as summarised in Table 3.The UCS value ranges from 35.97 to 59.77 MPa for granite and from 9.41 to 42.06 MPa for limestone.
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