plt conversion factor ucs for limestone

Vivika Väizene | Tallinn University of Technology ...

A conversion factor between PLTI and UCS for Jordan oil shale and dolostone was determined. The Crushing Resistance Test (CRT) on samples was conducted. Taking into consideration confidence limits, the recommended conversion factor 1 for Attarat oil shale and dolostone is respectively 14 and 12 and the recommended conversion factor 2 is 33 and ...

Point Load Strength Index of Half-Cut Core Specimens and ...

Apr 30, 2020· where F is the size correction factor (= D e /50) 0.45).. The studies on the shape and size effect in PLT are rather limited when compared to those on the estimation of the UCS from I s(50).The use of irregular samples before the PLT on rock cores was first recommended by Protodyakonov (), who compressed irregular rock lumps between two flat loading platens.

THE UNIAXIAL COMPRESSIVE STRENGTH OF SOFT ROCK

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

(PDF) Conversion of point load test results to ...

The conversion factors between UCS and PLA proposed in this paper are 21 for shale and 20.2 for limestone. These values are more in agreement wi th the ones

NEESAHANTANI MOGANAKRISNAN

Uniaxial compressive strength (UCS) is one of the most important properties of rock that are widely used in geotechnical field. Since, the direct method to obtain UCS is expensive; Point Load Test (PLT) is the most commonly used method to estimate UCS. There are several general conversion factor suggested such as by the ISRM. However, it

Geosciences | Free Full-Text | The Influence of Pre ...

For example, the PLT to UCS conversion factor can vary from as low as 8 to as high as 30, while the ITS to UCS conversion factor values vary between 2.7 and 50 [43,44]. This implies that the conversion factor is a rock characteristic parameter and not a universal value; therefore, its applicability must be assessed on a case by case basis.

Compressive Strength Of Rock - Ulang.in

the uniaxial compressive strength UCS and to propose appropriate Is50 to UCS conversion factors for different coal measure rocks The rock strength determined by the PLT like the load frame strengths that they estimate are an indication of intact rock strength and not necessarily the strength of the rock mass THE UNIAXIAL COMPRESSIVE.

Rock Slope Design Guide

To obtain the unconfined compressive strength from PLT a conversion factor is commonly used. Generally in Ohio, competent rocks (sandstones and limestones) use a conversion factor of 24 and incompetent rocks (shales and claystones) use a conversion factor of …

Reply to Discussion by Li and Wong on "Predicting the ...

May 22, 2012· The plots (Figs. 1, 2) show that the calculated conversion factors for UCS and BTS (Table 2) are slightly different from those given by Li and Wong. This negligible difference is due to the use by them of the average vales of UCS, BTS and I s (50) in calculating the conversion factors.

Estimation of Unconfined Compressive Strength (UCS) of ...

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.

Crusher For Granite Limestone

Quart granite limestone sand making machine in united states. granite ucs conversion factor . plt conversion factor ucs for limestone sand washing machine plt-ucs and to propose appropriate is50 to ucs conversion factors for different coal measure rocks know more granite ucs conversion factor -granite ucs conversion factor-convertion of crusher ...

SURFACE MINING TECHNOLOGY IN THE ZONES OF TECTONIC ...

limestone layers with a thickness of 10–40 cm, and kerogenous limestone ... The point load test (PLT) allows the determination of the uncorrected point load strength index Is. It must be corrected to the standard equivalent ... (UCS), index-to-strength conversion factors …

Case study: using the point load test to estimate rock ...

Dec 01, 2017· 10%· For limestone, the conversion factor from I s(50) to UCS is considered to be 15–38 (Chau and Wong 1996). The mean value of UCS for the limestone in the present study is 102.98 MPa. We have compared the UCS, the estimated UCS from blocky fragments, and the estimated UCS from drilled core samples.

Correlation between the point load index (Is(50)) and the ...

and it is necessary to apply a size correction factor, F = (D e / 50)α, with α = 0.45. This paper is based on limestone from Comunidad Valenciana (Spain) because it represents a very high percentage of their rocks. The implementation has been conducted over 700 field and laboratory tests of which 255 are PLT test, 45 are UCS test,

compressive strength of different rocks

compressive strength (UCS), and to propose appropriate (Is. 50) to (UCS) conversion factors for different Iraqi rocks. The rock strength determined by (PLT), like the load frame strengths that they are estimate, are an indication of intact rock strength and not necessarily of . Get Price; 11 Rock mass properties Strona głwna AGH

Correlation between Uniaxial Compressive Strength and ...

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

The Inﬂuence of Pre-Existing Deformation and Alteration ...

Apr 05, 2018· 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 ...

(PDF) Correlation between uniaxial strength and point load ...

UCS=26.5 PLI (Limestone) UCS=24.8 PLI (Sandstone) ... Deequivalent diameter During calculation F is the size correction factor ... .From these relations, UCS is predictable from PLT and SRHT with ...

USING THE POINT LOAD TEST TO DETERMINE THE UNIAXIAL ...

Conversion Factor Comments Das, 1995 Siltstone Western Canada, bituminous coalfields NG1 14.7 lumps, fresh core, old core Sandstone/siltstone NG 18 Shale/mudstone NG 12.6 Vallejo et al, 1989 Sandstone Eastern KY, VA, WV 420 PLT, 21 UCS 17.4 Freshly blasted rock, irregular lump samples Shale surface coal mines 1,100 PLT, 55 UCS 12.6

Point Load Test on Meta-Sedimentary Rocks and Correlation ...

Aug 21, 2012· Table 3 Conversion factors (k) of the meta-sedimentary rocks for UCS and BTS Full size table The conversion factors for UCS of our studied meta-sedimentary rocks range between 20 and 21, which are slightly lower than the suggested value of 24 by Broch and Franklin ( 1972 ), while they almost fall in the range of 21–24 for harder rocks, as ...

CORRELATION BETWEEN UNIAXIAL COMPRESSIVE STRENGTH …

Kelantan and limestone from Pandan Indah, Kuala Lumpur. The samples of granite and limestone are in fresh state (grade 1). Literature review shows that the conversion factor, K for correlating between UCS and Is (50) lies between 16-29. From this study, verification of laboratory test data shows that there is no clearly good correlation between ...

Point Load Test of Half-Cylinder Core Using the Numerical ...

The parameters of FJM with the properties of the rock are calibrated using UCS tests and PLT and are listed in Table 2. The ratios between UCS and were 21.76 (p1), 23.80 (p2), and 22.47 (p3), which confirmed the suggested values (the ratio between UCS and …

The determination of uniaxial compressive strength from ...

Feb 20, 2014· 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 relation between the UCS and I s for weak Cretaceous sandstone with a UCS lower than 40 MPa.

Rock mass properties - Rocscience Inc.

granodiorite, limestone, marble, rhyolite, tuff R4 Strong 50 - 100 2 - 4 Specimen requires more than one blow of a geological hammer to fracture it Limestone, marble, phyllite, sandstone, schist, shale R3 Medium strong 25 - 50 1 - 2 Cannot be scraped or peeled with …

Substructure Constructions for Multi-phases Highrise ...

The correlation of rock test results suggests a conversion factor of 13.3 as per Eq. (1) for estimating the unconfined compressive strength of limestone bedrock encountered in the project site as reported by Liew et at. (2010). UCS = 13.3 Is(50) (1) where UCS = unconfined compressive strength of rock (MPa)

Correlation between point load index and uniaxial ...

conversion factors are required for the evaluation of uniaxial compression strength. Lots of studies are done to determine ... Limestone UCS=21.9 I s(50) Other rock types [23] UCS=8.41 I s(50) +9.51 Coal measure rocks UCS=23.62 I s(50)-2.69 Strong rocks [25] UCS=24.4 I s(50) Weak rocks

plt conversion factor ucs for limestone - rolokna.pl

Design Manual Engineering Properties of Soil and Rock

correlations with index tests (if available) or experience, that result in a factor of safety approaching 1.0. For embankment or structure settlement, the engineering properties of the soils can sometimes be determined from laboratory tests outside and inside the zone of stress influence resulting from the

A Study on the Correlation between Uniaxial Compressive ...

Indirect tests such as the point load test (PLT) can be a useful alternative. In this study, correlation between the UCS and the point load strength index of limestone of Imgye area was analyzed, and the linear regression equation obtained from regression analysis of two variables was suggested.

Point Load Test of Half-Cylinder Core Using the Numerical ...

Jan 01, 2018· And [Is.sub.(50)] was constantly being used as a determination of UCS; therefore, the UCS of rock was a mainly considered factor in PLT. At the same time, in order to reduce the complexity of the DEM micromechanical parameter calibration, we selected three kinds of rock as shown in Table 1 (number 2 porphyritic granodiorite, number 3 ...

The estimation of uniaxial compressive strength conversion ...

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.

Paper title

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).

An investigation of the accuracy of the use of point load ...

Nov 23, 2015· This approach relies on the accuracy of a correlation factor used to predict the UCS value from the PLT. This paper sets out the results of several years of work to investigate the reliability of this method in modelling the UCS value in the Calp Limestone formation.

(PDF) Prediction of Uniaxial Compressive Strength (UCS) of ...

In the study cored rock specimens were tested for UCS tests, Point Load tests (PLT) and Schmidt Rebound Hammer Tests (SRHT). ... (UCS) of Sakesar Limestone in Salt Range - ... factors vary widely ...

DETERMINATION OF UNIAXIAL COMPRESSIVE STRENGTH OF …

Strength (UCS). It is often estimated on the field or trough Index-to-strength conversion factors proposed by various researchers for a specific rock type. The research presented in the paper involved field estimation of Uniaxial Compressive Strength using Schmidt rebound hammer and Point Load laboratory testing on limestone rock samples.

plt conversion factor ucs for limestone

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