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The study concludes that an increase in the content of quartz and feldspar leads to a gradual increase in the uniaxial compressive strength (UCS) value of granite.
The unconfined compressive strength (UCS) of rocks is a crucial factor in geotechnical engineering, assuming a central role in various civil engineering undertakings, including tunnel construction, mining operations, and the design of foundations. The precision in forecasting UCS holds paramount importance in upholding the security and steadfastness of …
The strength conversion factor (k) is the ratio between the uniaxial compressive strength (UCS) and the point load index (PLI). It has been used to estimate the UCS from the PLI since the 1960s. Many researchers have investigated the relationship between UCS and PLI for various rock types of different geological origins, such as igneous, sedimentary, and metamorphic …
sion factor to estimate the strength values. In this case, the uncertainties associated with the PLI determination would enter the strength estimation by several times. In the literature, different conversion factors up to 50 have been provided in order to correlate the uniaxial compres-sive strength (UCS) to the point load index for different
Preparing desired smooth specimens from pyroclastic rocks is difficult and time consuming for some standard tests such as uniaxial compressive strength (UCS) test, since they are weak or soft rocks. For this reason, the development of some equations is important for predicting the UCS of pyroclastic rocks. A linear correlation was suggested for the prediction of …
Concluding remark is that the UCS-BPI conversion factor for the pyroclastic rocks is lower than the suggested general conversion factor of 5.5 and the UCS-BPI relation is best represented by power ...
The UCS is the peak value of the diagram and is equal to 44.7 MPa. Photos of the specimen before and after the test are presented in Figure 2. During the failure process, cracks propagated from the bottom to the top of the specimen, shearing off a large piece of the sample.
The Bukit Timah Granite (BTG) formation is widely distributed in the central and northern parts of Singapore Island. The BTG rocks in the formation vary from granite to granodiorite.
The present paper has developed a new multivariate linear regression and adaptive neuro-fuzzy inference processing to predict UCS for weathered granite grade III based on simple input data from point load index, Schmidt rebound hardness, and P wave velocity. Data from 85 rock core samples of this granite type have been selected. By using multivariate …
Many researchers have investigated the relation between UCS and PLI for different rock types using the UCS/PLI ratio, which is termed the strength conversion factor (k). Broch and Franklin …
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 regarded as a universal value applicable to all rock types in most rock mechanics text books. It should be noted, however,
These conversion curves are generated from classical Schmidt hammer curves found in the literature using a conversion between the mechanical and optical rebound values based on …
This paper also reviews the abrasivity of Bukit Timah Granite and factors affecting it. Influence of UCS and other factors on the drilling, coring and excavation rates in Bukit Timah Granite are ...
Uniaxial Compressive Strength (UCS) is a key indicator of the mechanical properties of a rock, particularly in the diagnostic and restoration phases when stones are employed as construction material.
This paper analyses the temperature change and acoustic emission (AE) characteristics of the granite heating process (25–600 ℃), air cooling, pore water injection, surface water spraying, and ...
quarrying and processing of granite building stones. Hence, tool wear and short tool life span constitute the main cost factors in quarrying and processing of abrasive building stones (Gupta 2018; Farhadian et al. ... UCS of Iranian granite building stones based on Vp and SHR. It should be noted that the term "granite"
The point load test (PLT) has been considered a flexible approach to estimate the uniaxial compressive strength (UCS) of rocks. Previously, empirical equations were obtained by mathematical fitting or machine learning to predict the UCS of rocks. The acquisition of these equations usually required a large amount of experimental data, while the corresponding …
Uniaxial compressive strength (UCS) and tensile strength (BTS) of rocks are very important parameters in the practice of mining engineering, tunneling, slope engineering, etc. The method of obtaining the BTS and UCS of rocks by indirect measurement through point load test is very widely used. In order to improve the accuracy and convenience of indirect measurement, …
In the present paper, Bayesian model class selection will be utilized to identify the most significant parameters affecting UCS of Grade III granite based on a series of measured …
The average UCS and direct tensile strength for Creighton Granite are 203 and 9.0 MPa, respectively. The tensile strength was estimated from BTS data by applying a conversion factor of 0.86 (Perras & Diederichs, 2014).
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 ...
To investigate the damage mechanisms in granite's physical and mechanical properties after high-temperature water quenching, this study employed MTS815.04 for uniaxial compression tests on ...
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 ... is the factor for intact rock in the Hoek Brown failure criterion for rock masses. Values in brackets have been estimated by Hoek et al. (1992); values with question mark ...
This article introduces a fresh methodology for UCS prognostication by amalgamating Gaussian process regression (GPR) with two pioneering optimization …
As such, conversion factors between the UCS and I s50 have been proposed by numerous researchers and have proven to be rock-dependent. For example, Chau and Wong (1996) observed from experimental data that the ratio between the UCS and I s50 of Hong Kong granite was 12.5.
(2004) also reported that different conversion factors are required for soft and hard rocks. 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
The index-to-strength conversion factor (k) that is relating UCS to the point load index (PLI) was proposed to estimate the UCS from the PLI indirectly (ISRM 1985). Numerous studies have been conducted on a wide range of rock types with different sizes, shapes, and point loading directions to establish reliable empirical conversion factors ...
where F is the size correction factor, F = (D e /50) 0.45; I s is the uncorrelated point load strength, MPa; and D e is the "equivalent core diameter" in mm, which is related to the test type. For example, D 2 e = D 2 for diametral tests and D 2 e = 4A/π for axial, block, and lump tests, where A = WD = minimum cross-sectional area of a plane through the platen contact …
Hence, varied powder factors have been found to have varying effects on rock fragmentation sizes and by extension, granite productivity. Discover the world's research 25+ million members
