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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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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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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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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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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Conversion of Point Load Test Results to Conventional

3 Tables 1 and 2 show the conversion factors between UCS and PLA for shale and limestone rocks from several studies, respectively [6, 7, 8, 9].

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SUGGESTING CONVERSION FACTOR COEFFICIENTS FOR …

The conversion factor coefficients determined in the conversion of hardness values to each other provide more reliable resul ts than the prediction models created . Figure 5.

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Slide2 Documentation | Generalized Hoek-Brown

Generalized Hoek-Brown. The Generalized Hoek-Brown strength criterion is described by the following equation:. where: is a reduced value (for the rock mass) of the material constant (for the intact rock) and are constants which depend upon the characteristics of the rock mass. is the uniaxial compressive strength (UCS) of the intact rock pieces

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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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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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Summary of conversion factors for different rock types.

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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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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Equations correlating the UCS to Schmidt hammer rebound number

The various soft-computing models proposed in the literature for the prediction of the UCS of granite are presented in Table 3, which shows details of the machine learning algorithm, the input ...

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Uni-Axial Compression Strength – Point Load Index …

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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Point Load Test Results and Conversion Factors

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. ... 68 UCS 66 1,000 65 NG 160 386 NG Conversion Factor 14.7 18 12.6 17.4 12.6 8 15 24 23.7 21-22 30 29 23.4 20 23.9 20 14.1 Reference in Choi and Hong, 1998 ...

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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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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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UCS values and corresponding failure modes of …

UCS value along with the corresponding failure mode of the granite specimens is given in Table 2 and Fig. 7a. The dominant failure mode in granite up to the UCS value of 120 MPa is axial...

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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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Rock Schmidt Conversion Curve Database R

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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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Uniaxial Compressive Strength

The ratings based on both UCS (which is preferred) and point load strength index are given in Table 6.1. UCS may also be obtained from the point load strength index tests on rock lumps at the natural moisture content. See Table 8.13 for average UCS values of a variety of rocks. The pH value of groundwater may affect the UCS in saturated conditions.

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Correlation between uniaxial compressive strength and point load

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 …

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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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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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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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USING THE POINT LOAD TEST TO DETERMINE THE …

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. …

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(PDF) Correlation between point load index and uniaxial …

In the case of pink and white granite the correction factors are F=(De/50)0.9 and F=(De/50)1.4 respectively. ... with the UCS was analysed to propose appropriate Is50 to UCS conversion factor for ...

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