In agreement with previous observations on weak rocks (Palchik and Hatzor, 2004; Kahraman et al., 2005, Sabatakakis et al., 2008), the linear correlation factor between PLT and UCS tests has a value approximately half of the standard value (UCS/I S50 = 24.5), which is proposed as a good approximation for all the rock types by ASTM D5731-07 (2007).

strength (UCS). Broch and Franklin [17] suggested a conversion factor of 24 as a correlation between UCS and I S(50). However, this conversion factor is more effective for hard rock materials than soft rock materials. The strength of soft rock materials is much lower than that of hard rock materials, so the conversion factor

granite ucs conversion factor - .za. granite ucs conversion factor. The Company Shanghai GME is the leading provider of equipment, services and integrated solutions in industrial crushing and grinding ... Get Price The estimation of uniaxial compressive strength conversion ... The point load (PL) test is generally used for estimation of ...

The axial PLT is used to measure the UCS. The Point Load Index (Is50) is converted to UCS by the following equation: UCS = K (Is50) 1 ) (Where K is the Conversion Factor. Mark and Molinda (6) originally adopted the K values proposed by Vallejo (7) for the ... NEW DEVELOPMENTS WITH THE COAL MINE ROOF RATING ...

Because PLT and ITS are easier and quicker to perform compared to the UCS, many authors have tried to relate the PLT and ITS to UCS [21–23]. Experiments performed on a large variety of intact rock types have shown that indeed tensile strength can be correlated to the UCS by a conversion factor, k [22–24]. However, conversion factor k is non ...

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This paper aims to validity of the test methods were investigated. represent an analysis of the data used to As the conclusion, the conversion factors are correlate the point load test index (Is50) with the presented and the point load test had been conventional strength tests such as UCS and determined as the most preferable indirect test ITS ...

Nov 23, 2015· In the absence of UCS test results, or in the absence of a sufficient number of test results, point load index test (PLT) results of the recovered core are frequently used to estimate the UCS value. This approach relies on the accuracy of a correlation factor used to predict the UCS value from the PLT.

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The conversion factor between UCS and PLTI (Factor 1 and Factor 2) was determined for oil shale and dolostone layers by using different methods. This factor can be used to calculate UCS when PLTI normal to the planes of weakness is known.

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A correlation factor (k) between uniaxial compression strength and point load test of about (6) has been proposed, for rock of very low strength of 2 MPa 7.5 or less. This study confirms that the UCS estimation equations are rock dependent. But as the ratio of (mean UCS/mean PLT) increases factor increased linearly as the k the equation,

formula for the calculation of the UCS based on corrected Is to a specimen diameter of 50 mm Is(50). The index-to-strength conversion factor (k) relating UCS to Is(50) was reported to depend on the compressive to tensile strength ratio, the Poisson's ratio, the length and the diameter of the rock specimen. Their theoretical prediction for k=14.9

Link_to_subscribed_fulltext. Abstract: 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, and possible field application.

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Sep 01, 2015· Two different methods were used to determine the conversion factor between UCS and PLTI. One method was employed to determine the conversion factor for each sample separately. For example, for finding the value from PLTI normal to UCS for oil shale, the conversion factor was 14.0 [+ or -] 5.4 with a probability of 95% (Table 1).

Conversion factor (CF) Different conversion factors apply to rocks of different strength [34]. The conversion factor between UCS and PLTI (Factor 1 and Factor 2) was determined for oil shale and dolostone layers by using different methods. The anisotropy of resistance of oil shale and dolostone to disjointing was also determined (Factor 3).

All UCS strengths were corrected to L / D = 2 standard specimen ratio (Thuro at al. 2001), and PLT specimens were transformed to UCS strengths with conversion factor 24 (Rusnak et al. 1999). Figure 1. PLT correlated to UCS histogram and applied fits (dash line Weibull and continuous line Gamma).

What factor do you use when doing a platelet slide estimate? Answer. Platelet (PLT) estimates are an integral part of peripheral blood-smear evaluation. Platelet estimates help to ensure accuracy of the automated platelet count and/or provide a blood-smear quantitative platelet analysis.

Various studies in the literature propose relationships between I s50 (from point load test) and UCS, thus objective of this study is to determine conversion factors relating I s50 and UCS for intact sedimentary rocks, as well as for conglomerates and breccias, since to those rocks, specimen with geometric characteristics for the USC test ...

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and III). For each class a conversion factor was assigned to multiply with the point load strength index value in order to get the UCS value. The ASTM D -5731-08 presented a correlation between UCS and I s(50) which is dependent on a site specific conversion factor (C) to multiply with the point load strength index value in order to get the UCS ...