Jun 27, 2013· Parameters of BPI and Is (50) were assigned by dividing UCS with the conversion factors obtained in this study. For SRH and V p,the membership function parameters were selected from the literature where SRH and V p of rocks of different weathering grades are presented (e.g. Aydin and Basu, 2005,Basu, 2006 ) in order to cover a wide range of

Feb 20, 2014· Bieniawski (1975) indicated that the UCS was nearly 23 times of the Is. Pells (1975) stated that the index to strength conversion factor of 24 could lead to a 20% error in the prediction of compressive strength for such rocks as dolerite, norite and pyroxenite.

2.2 The proposed values for the conversion factor K relating the uniaxialcompressive strength (UCS) to the point-load index strength (Is50)reported by various authors 3.1 Dimension of the limestone and granite samplesforuniaxialcompressivetest (UCT) 3.2 Dimension of the limestone and graniteforpoint-load index strengthtest

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

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

Chau and Wong proposed a simple analytical 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 was reasonably close to

Sep 02, 2015· Up to10%cash back· A very detailed study was carried out on a wide range of rock types and a linear relation (Eq. 7) between UCS and BPI with a conversion factor is 5.1 was suggested in 2001 (Sulukcu and Ulusay 2001).However, the recent studies (Mishra and Basu 2012; Yesiloglu-Gultekin et al. 2013) show that the relation between UCS and BPI may differ from the suggested

Jul 01, 2019· The linear regression analysis showed that the conversion factor between UCS and BPIc was obtained as 5.7 for the tested rocks, which is already higher than the proposed value of 5.1. A conversion factor equal to 7.4 was derived for relation between UCS and CPI.

Jul 01, 2019· A conversion factor equal to 5.7 was established between UCS and BPI c. This value is higher than the advised conversion factor of 5.1. Nevertheless, the 5.1 conversion factor is proposed for general practice, and is not exclusively advised for igneous and metamorphic rocks.

) with the UCS for local granite. The I s(50) is widely used to determine the rock strength by estimating the UCS using conversion factor, κ. The I s(50) value is known to correlate well with UCS. Various studies have come out with correlation between UCS and I s(50) . It is found that the index-to-strength conversion factors are rock dependent.

Sep 02, 2015· A very detailed study was carried out on a wide range of rock types and a linear relation (Eq. 7) between UCS and BPI with a conversion factor is 5.1 was suggested in 2001 (Sulukcu and Ulusay 2001).However, the recent studies (Mishra and Basu 2012; Yesiloglu-Gultekin et al. 2013) show that the relation between UCS and BPI may differ from the suggested relation or may not be linear for

Apr 01, 2012· Empirical equations proposed for predicting UCS and Brazilian tensile strength (BTS) from BPI by the previous researchers are summarized in Table 1.Gokceoglu and Aksoy showed that BPI could be used as an alternative parameter to rate intact rock strength in the Modified-RMR system. Sonmez and Tunusluoglu indicated that prediction of UCS from BPI by a unique conversion factor could lead

For the conversion of the PL into UCS, the k factor was found to be 17.78, 25.78 and 32.62 for Sandstone, Brisbane Tuff and Basalt respectively while the conversion from BTS to UCS, the k factor was found to be 10.55, 10.65 and 15.14 for sandstone, Brisbane Tuff and basalt respectively.

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

Sep 24, 2020· Broch and Franklin recommended an approximate conversion of UCS with a k-value of 24, whilst ISRM suggested a range of k values from 20 to 25. However, the conversion factor may only be suitable for the prediction of UCS (σ c) in hard rocks. For soft rock, the conversion factor could be less than 24 (Agustawijaya 2007).

Granite Basalt Gneiss Schist Quart-zite Marble Lime-stone Sand-stone Shale Av. Co Max. Co Min. Co Range No. of samples 181.7 324.0 48.8 275.2 26 214.1 358.6 104.8 253.8 16 174.4 251.0 84.5 166.5 24 57.8 165.6 8.0 157.6 17 288.8 359.0 214.9 144.1 7 120.5 227.6 62.0 165.5 9 120.9 373.0 35.3 337.7 51 90.1 235.2 10.0 225.2 46 103.0 231.0 34.3 196.7

The correlation of the Point load test index (Is50) with the UCS was analysed to propose appropriate Is50 to UCS conversion factor for weak rocks. View full-text Conference Paper

164 Chapter 11: Rock mass properties y =mσcix+sσci (11.5) where ' x =σ3 and ' 2 3 ' y =(σ1 −σ) For n specimens the uniaxial compressive strengthσci, the constant mi and the coefficient of determination r2 are calculated from: n x x x n xy x y n n y ci ∑ ∑ −∑ ∑ −∑ ∑

Rock Type UCS Conversion Factor Norite 23 Feldspathic Pyroxenite 22 Pyroxenite 16 Parapyroxenite 28 Serpentinite 28 Granofels 26 Calc-silicate 25 These are site specific conversion factors calculated from the lab UCS tests for the major rock types (Hayes & Piper, 2003). These factors fall within the ISRM (1985) recommendations (Little, 2006).

An adaptive neuro-fuzzy inference system for predicting unconfined compressive strength and Young’s modulus: a study on Main Range granite By Danial Jahed Armaghani and Edy Tonnizam Mohamad Prediction of uniaxial compressive strength of sandstones using petrography-based models

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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 plant grinding mill equipmentconvertion of crusher plant

Granite Ucs Conversion Factor. ucs (c) is also one the key mechanical properties of rocks as its assessment is necessary the index-to-strength conversion factors have been proposed by a number of properties and weathering of ornamental granites. Get Price. stone crushing workers in dubai

Sep 02, 2015· A very detailed study was carried out on a wide range of rock types and a linear relation (Eq. 7) between UCS and BPI with a conversion factor is 5.1 was suggested in 2001 (Sulukcu and Ulusay 2001).However, the recent studies (Mishra and Basu 2012; Yesiloglu-Gultekin et al. 2013) show that the relation between UCS and BPI may differ from the suggested relation or may not be linear for

For the conversion of the PL into UCS, the k factor was found to be 17.78, 25.78 and 32.62 for Sandstone, Brisbane Tuff and Basalt respectively while the conversion from BTS to UCS, the k factor was found to be 10.55, 10.65 and 15.14 for sandstone, Brisbane Tuff and basalt respectively.

between the strength parameters of granite. Results show that there is significant factor between tensile strength and UCS in a ratio of 1 to 10. Meanwhile, for point load index, I S(50) and UCS correlated, the correction factor is 15, within the range of correction factor determined by other researchers.

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.

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.

Rock Type UCS Conversion Factor Norite 23 Feldspathic Pyroxenite 22 Pyroxenite 16 Parapyroxenite 28 Serpentinite 28 Granofels 26 Calc-silicate 25 These are site specific conversion factors calculated from the lab UCS tests for the major rock types (Hayes & Piper, 2003). These factors fall within the ISRM (1985) recommendations (Little, 2006).

6 The relationship between UCS and porosity for granite-----54 Fig 3. 7a,b The relationship between Schmidt hammer and Ip-----56 Fig 3. 8 Plot of PLS against the volume of secondary constituent-----57 Fig 3. 9 The relationship between UCS and Ip for granite and basalt-----58

An average conversion factor (k) of 15.7 was derived in the zero-intercept regression model HLB = k ⋅ SHR, which may be used in practice as a guide to translate the measured hardness values from

Stone Mt. granite 55.1 51.0 0 69 Indiana limestone 6.7 42.0 0 10 . 8-10 8.4 THEORY OF STRENGTH Several theories of strength have been applied to soils and rocks but the most widely used is the Mohr-Coloumb theory. This is based upon a combination of the Mohr theory of

The uniaxial compressive strength (UCS) of intact rocks, as estimated from the point load index using conversion factors, together with the Hoek–Brown constant mi, and the Geological Strength

Jan 21, 2015· The values obtained from point load testing can be converted to UCS with an appropriate conversion factor, generally ranging from 16 to 24 (Bieniawski 1975). The test was carried out on the core samples prepared from the blocks of the rocks. The point load test results are shown in Fig. 17.

Jan 13, 2021· The study has depicted that the conversion factor between UCS and point load index (I s(50)) varies from 13 for soft sedimentary rocks with I s(50) < 2 MPa to 28 for harder rocks with I s(50) > 5 MPa, whereas the average obtained conversion factor was 23, regardless of the rock type.

The focus of this paper is to present the data analysis used to correlate the point load test index (Is 50) with the uniaxial compressive strength (UCS), and to propose appropriate Is 50 to UCS conversion factors for different coal measure rocks.

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