Prediction of Uniaxial Compressive Strength of Granite Rock Samples of Lugoba Quarry Using Rebound Hammer Test 18 Tanzania Journal of Engineering and Technology Tanz. J. Engrg. Technol., Vol. 40 No. 1, June 2021 RHN established using data obtained from field tests is normally used. Compressive strength of a rock material may be defined
Jul 31, 2021 In quarries, uniaxial compressive strength is a crucial parameter in the analysis of geotechnical problems involving rock stability and rock blasting design. This study aims at establishing the empirical models of uniaxial compressive strength fits on rebound hammer number that can be used to predict uniaxial compressive strength of granitic ...
The uniaxial compressive strength, elastic modulus, point load strength, Schmidt hammer value, P-wave velocity, density and porosity values of the samples were determined in the laboratory.
Dec 14, 2015 1. Introduction. 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 material ...
Strength criterion for rocks under compressive-tensile stresses and its application, Journal of Rock Mechanics and Geotechnical Engineering, Volume 7, Issue 4, August 2015, Pages 434-439, https ...
The crushing strength of granite rocks, while trap rocks from other countries were tested for crushing uniaxial compressive strength on granite. The uniaxial compressive strength test was shown on June 16, 2015, which was designed to measure the unconfined strength of kaolin Taxus samples.
Uniaxial compression tests have been conducted on Oshima granite under various constant axial strain rates ranging from 10 8 to 10 4.The results showed that the strength and the acoustic emission rate increased exponentially with increasing strain rate.
Feb 16, 2021 The uniaxial compressive strength of jointed granite increases with increasing angle between the joint and the maximum principal plane, and the peak strength of intact granite is higher than that of conjugate jointed granite and echelon jointed granite. 3.
Normal variation of compressive strength and the factor m in Hoek-Brown failure criterion for some rocks data from Hanssen, 1988 Hoek and Brown, 1980 and Hoek et al., 1992. Rock name Uniaxial compressive strength c Rating of the factor Rock name Uniaxial compressive strength c factor Rating of the low average high m i
Jun 21, 2018 The compressive strength of granite depth 13772002 m taken from GPK-1 see Fig. 1 for location was found to range between 120 and 485 MPa at a confining pressure of 40 MPa Rummel 1992, and uniaxial compressive strength UCS values between 100 and 130 MPa are reported for unaltered granite from Soultz-sous-For ts in an unpublished ...
Table 2 Typical values of Uniaxial Compressive Strength for a various number of rocks from Attewell amp 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.
Qin et al. 6 carried out uniaxial compressive tests and triaxial compressive tests on granite after different temperature heating 20 C1000 C, and the test results showed that different temperature values have an important influence on the stress-strain relationship, deformation type, failure mode, strength and deformability of granite ...
These granite samples are light coloured and have a coarse grain size as reported by Goh 2012. Figure 1 Location of test sites, Peninsular Malaysia METHODOLOGY The uniaxial compressive strength test is used to measure the uniaxial compressive strength UCS of intact rock.
Apr 20, 2013 Uniaxial compressive strength UCS is one of the most widely used rock mec hanical par ameters in rock engineeri ng like desig n and construc tion of founda tions, tunne ling, slop e
The study of dynamic uniaxial compressive strength of granite at strain rate from 10-4 to 10 0 s-1 is conducted using sliding crack model. It is shown that the theoretical strengths increase with increasing strain rate and agree well with the experimental results.
May 10, 2015 Ng, I. T., and C. H. Lau. Determination and Estimation of Uniaxial Compressive Strength for Macau Granite. Paper presented at the 13th ISRM International Congress of Rock Mechanics, Montreal, Canada, May 2015.
Uniaxial compressive strength ... Granite 154 48 313 71 169 42 250 20 Granodiorite 160 51 319 2 171 20 118 2 Gabbro 228 106 466 5 248 76 306 1 Norite 229 82 356 8 - - - - Olivinestone - - - - 87 113 1307 5 Peridotite 197 55 280 1 109 164 1502 1 Monzonite 110 28 256 8 106 61 580 4 ...
Uniaxial compressive strength UCS of rocks is an important parameter in geotechnical structure designs. Being difficult to obtain proper sample and the UCS test itself is expensive, indirect methods of estimating UCS were developed such as point load test. In this study, an attempt has been made to correlate the point load strength index Is50 with the UCS for local granite.
3.10 Uniaxial compressive strength test apparatus 42 4.1 Mode of failure of granite under point loading 48 4.2 Mode of failure of the samples caused by tensile load 50
uniaxial compressive strength from the results of the point load test. 4. Test Results and Discussion 4.1 Uniaxial Compressive Strength Test Results The mean values of uniaxial compressive strength of the tested rocks are listed in Table 2. The strength values range from a low of 9.16 MPa for Marl to a high of 101.08 MPa for
Concrete Compressive Strength Test Table Uniaxial Compressive Strength of Stones Test Table Type of Stone Weight lbscft Average Maximum Water Absorption Percentage by weight Minimum Compressive Strength kgsqcm Granite 165 05 1000 Basalt 225 05 400 Lime Stone S amp Tiles 160 015 200 Sand Stone S amp Tiles 140 25 300 Marble 170 04 500 Quartzite 225 04 800
Table 11.2 Field estimates of uniaxial compressive strength. Grade Term Uniaxial Comp. Strength MPa Point Load Index MPa Field estimate of strength Examples R6 Extremely Strong 250 10 Specimen can only be chipped with a geological hammer Fresh basalt, chert, diabase, gneiss, granite, quartzite R5 Very strong 100 - 250
Keywords soft rock, uniaxial compressive strength, physical characte ristic, point load strength index, and conversion factor. INTRODUCTION strength due to changes in moisture content seems The term soft rock is often referred to rock materials with a uniaxial compressive strength UCS lower than that of hard rocks and higher than that of soils.
Uniaxial compressive strength test Uniaxial compressive strength tests were conducted on prepared core samples, which had a diameter of 38 mm and a length-to-diameter ratio of 22.5. The stress rate was applied within the limits of 0.51.0 MPas. At least five tests were done for each rock type and the average value was recorded as the UCS ...
Mar 31, 2014 Lee, S. G. and Lee, S., 1995, A suggested method to predict uniaxial compressive strength of Korean granite by point load strength, 1995, KSCE Journal of Civil Engineering, 154, 1015-1027In Korean with English abstract.
Jun 04, 2015 Estimating compressive strength. General rock failure criterion can be reduced to a few parameters dependent on lithology m and the uniaxial compressive strength C 0.Lithology is commonly derived during log analysis, so m may be estimated Table 1.What is needed still is an initial measure of rock strength provided by C 0. C 0 can be estimated from porosity or sonic velocities, but
Uniaxial compressive strength UCS, tensile strength, resistivity, density and porosity values are given in table 2. The UCS of granite normally varies between 100 and 250 MPa. The UCS values of some granites tested lower than 100 MPa. These granites have coarse grains. The cause of the low strength may be because of the coarse grained texture.
Jan 26, 2021 Uniaxial compressive strength. A static uniaxial compression test of rock can be used to measure the compressive strength of the rock. The test calculation formula is as follows ... The compressive strength of granite decreases with an increase in the number of thermal shocks. After 1, 4, 8, 12 and 15 cycles of thermal shocks, the average ...
The compressive strength of granite depth 13772002 m taken from gpk-1 see fig.1 for location was found to range between 120 and 485 mpa at a confining pressure of 40 mpa rummel 1992, and uniaxial compressive strength ucs values between 100 and 130 mpa are reported for unaltered granite from soultz-sous-forts in an unpublished.
Kazi et al. 1983 proposed an empirical equation relating the uniaxial compressive strength of intact rocks to their dynamic modulus. A statistical analysis of more than 200 tests reported in the literature on seven different rock types yielded the following empirical equation 2.3 Hookes Law Isotropic Formulation
Jul 30, 2019 Mechanical properties are determined as uniaxial compressive strength of 78.8 MPa, Poissons ratio of 0.24, and elastic modulus of 17.81 GPa. Both uniaxial compressive strength and elastic modulus of the weathered granite significantly decrease, compared to
Dec 04, 2019 Fissures have a great influence on the strength of granite in a uniaxial compression test. It is obvious that the compressive stress exhibits an approximately linear upward relation with increasing in the range from 30 to 60 as shown in Figure 3 .
Mar 11, 2020 The compressive strength of granite under different conditions is 149.416 MPa and 133.392 MPa, respectively, and the uniaxial compressive strength of granite samples under dry conditions is higher. The average modulus calculated in this paper is the slope of the secant line at the two points on the stress-strain curve before the peak.
Dynamic uniaxial compression tests for the Bukit Timah granite in Singapore were conducted at four loading rates 10 0, 10 1, 10 3 and 10 5 MPas. It was found that the compressive strength increases from 205 MPa to 235 MPa with loading rate increasing from 10 0 to 10 5 MPas. Evidence also indicates that there are small changes in the Youngs modulus and the Poissons ratio of the granite with the
Jun 20, 2021 To obtain the uniaxial compressive strength of the granite, an MTS-793 fatigue machine Fig. 2a was employed with a displacement-control mode at a loading rate of 0.3125 ms. With this machine, the static fracture behavior could be fully demonstrated Fairhurst and Hudson 1999