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UCS and PLT data concerning foliated rocks in the literature [36,42] plotted on the same diagram confirms that, indeed, for foliated rocks, the UCS and the PLT can be related to each other. The zero-intercept regression equation obtained for each data set has given conversion factors of seven (current data set), 12 and 20 . This difference ...
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The point load strength index (Is) was evaluated from Eqs. (6-7) and correlated to UCS by a coefficient factor (Eq. (8)). Rusnak and Mark (1999) had proposed 21.9 as conversion factor for typical ...
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But as the ratio of (mean UCS/mean PLT) increases the k factor increased linearly as the equation, k=0.871(mean UCS/mean PLT), which is a new derived equation easily can be used and must be the ...
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They concluded that a conversion factor of 21–24 should be used for harder rocks and 14–16 for softer rocks. Wood and Shaw (2012) investigated the …
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For determining the full stress strain curve ISRM (1999) suggests 20:1. Blanks and McNamara (1935) performed tests on cylindrical mass concrete specimens with a height to diameter ratio of 2:1 ...
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reported by Smith (1997) in which the correlation factor varied between a value of 8 for rocks with UCS of less than 1000 psi (6.9 MPa) to a value of 24 for rock samples with UCS of more than 6000 psi (41.5 MPa). Similar studies (Akram, and Abu Bakar, 2007) showed high differences in correlation factors for the same rock
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ISRM (1985) has given conversion factors of 20 and 25 between PLI and UCS. Broch and Franklin (1972) pro-posed the value of 24 for conversion of PLI to UCS for various rocks that they tested, which may be misleading as Fig. 1 Point load testing with specimen dimensions (after Peng and Zhang 2007) Table 2 Conversion factor between UCS and …
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From the results of these tests, a conversion factor equal to 14 is proposed to correct the point load strength index in order to estimate the uniaxial compressive …
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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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In the literature, conversion factors on different sedimentary, igneous and metamorphic rocks can be found, but no study exists on trona. In this study, laboratory UCS and field PL tests were carried out on trona and interbeds of volcano-sedimentary rocks. Based on these tests, PL to UCS conversion factors of trona and interbeds are proposed.
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ratio, which is termed the strength conversion factor (k). Broch and Franklin (1972) indicated that the UCS was approximately 24 times the PLI for a standard-size (50-mm) core. Bieniawski (1975) showed that the UCS was nearly 23 times the PLI. Pells (1975) stated that using an index to strength conversion factor of 24 yielded a 20 %
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relations is the fact that many of the same factors that affect rock strength also affect other physical properties such as velocity, elastic moduli and porosity. In many cases, such relationships have been suggested for sedimentary rocks mainly because the strength infor-mation is greatly demandedin reservoirs for drillingand maintenance of ...
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UCS tests were performed using NX-size (54 mm) core samples of quartzite, sandstone, amphibolite, gabbro, khondalite, epidiorite, limestone, dolomite, …
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Uniaxial compression strength (UCS) is a fundamental parameter to carry out geotechnical engineering design and construction. It is simple and efficient to predict UCS using point load strength (PLS) at engineering sites. However, the high dispersion of rock strength limits the accuracy of traditional fitting prediction methods. In order to improve …
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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 27.5 MPa or less. This study confirms that the UCS estimation equations are rock dependent. But as the ratio of (mean UCS/mean PLT) increases the k factor increased linearly as the equation,
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This research study has conducted to correlate the rock UCS with PLT index for the two (2) most common bedrock formation encountered in Kuala Lumpur, namely …
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estimation of UCS. The correlation factors vary widely depending upon the rock type, weathering grades, mineralogical formations and stratigraphic structures and number of test results being correlated. Therefore, for a reasonable and valid estimation of UCS from simple tests, calculation of the correlation factor on reasonable
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In the literature, conversion factors on different sedimentary, igneous and metamorphic rocks can be found, but no study exists on trona. In this study, laboratory UCS and field PL tests were carried out on trona and interbeds of volcano-sedimentary rocks. Based on these tests, PL to UCS conversion factors of trona and interbeds are proposed.
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coastal deposits. It was shown that the average UCS/PLI ratio for three limestone sites was 14.3, which was low compared to the expected value of 24 derived from hard rock …
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(PLT), which is a simple and widely accepted testing ... Conversion factors between UCS and PLA for Limestone rocks Study Country PLA to UCS conversion factor Hawkins and Olver (1986) UK 26.5 ...
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The index-to-strength conversion factor was computed as the ratio of UCS over PLT index from the design line. To establish the relationship between PLT index …
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The correlation obtained between UCS and PLT is strong (r = 0.85) (Fig. 21a), similar to the result by other authors [154, 155, 177,178]. In the literature consulted the linear fit is the …
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The PLT is considered a flexible strength-index test for rock engineering projects, which has been recommended by the International Society for Rock Mechanics (ISRM) 1 and the American Society of Testing Materials (ASTM). 2 PLT is appealing since it is easy to perform and requires little or no preparation of machined specimens, …
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Rock engineers use the uniaxial compressive strength (UCS) of rocks prevalently in the design of surface and underground structures. UCS is one of the most important engineering parameters in rock ...
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Uniaxial Compressive Strength (UCS) is one of the most important properties of rocks. Point Load Test (PLT) is practically used in geotechnical engineering to determine rock strength index. Despite that the PLT is fast, economical and simple in either field or laboratory, Uniaxial Compressive Test (UCT) is time-consuming and expensive.
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Vallejo et al. (1989) Sandstone 420 PLT and 21 UCS 17.4 . Smith (1997) ... For weak Simsima limestone of average UCS valu es between 5.0 ... index-to-strength conversion factors are used. These ...
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UCS = K . Is50 (2) The conversion factor K was determined using linear regression analysis of data collected for 15 different rock types; and was found to be about 24. Since then, this value has been ... Limestone: 11.1 (Akram and Bakar 2007), 17.7 to 27.1 ((Brautigam et al. 1998), and 21.9 (Rusnak and Mark 2000)
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The uniaxial compressive strength (UCS) of rock has been recognized as one of the major technical factors of rock-related engineering constructions [1,2,3], and it has also been regarded as the basic parameter of geotechnical engineering designs and constructions [].Moreover, UCS has been used in various aspects of the rock-mass …
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In the study cored rock specimens were tested for UCS tests, Point Load tests (PLT) and Schmidt Rebound Hammer Tests (SRHT). All the tests' results were analysed using statistical techniques to ...
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Exact copies of PLT and UCS tests can be realistically reproduced, which can help users better understand the construction and working principle of the testing machine. ... The estimation of uniaxial compressive strength conversion factor of trona and interbeds from point load tests and numerical modeling. J Afr Earth Sci, 131 (2017), pp. …
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