Study on the Prediction of the Uniaxial Compressive Strength of Rock
ResultThe uniaxial compressive strength of rock is one of the most important mechanical properties of rock and is widely used in rock foundation design, rock mass quality classification, and rock mass engineering stability analysis [1,2].The method of determining the uniaxial compressive strength of rocks by …
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Rock mass properties
ResultBrown failure criterion for jointed rock masses is defined by: (1) where and are the maximum and minimum effective principal stresses at failure, is the value of the Hoek-Brown constant m for the rock mass, s and a are constants which depend upon the rock mass characteristics, and is the uniaxial compressive strength of …
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Relationship between point load index and compressive strength …
ResultThe uniaxial compressive strength (UCS) is one of the important geo-mechanical variables of the intact rock that is used to assess the quality of rocks in civil and mining engineering excavations like tunneling, open pit and underground mining, underground space, and rock-cutting by tunnel boring machine or …
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Comparative Evaluation of Empirical Approaches and …
ResultThe uniaxial compressive strength (UCS) of rocks is one of the key parameters for evaluating the safety and stability of civil and mining structures. In this study, 386 rock samples containing four properties named the load strength (PLS), the porosity (Pn), the P-wave velocity (Vp), and the Schmidt hardness rebound …
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IS 8764 (1998): Method of determination of point load …
ResultOn average, uniaxial compressive strength is 20-25 times point load strength index of rock cores. However, in tests on many different rock types, the ratio can vary between 15 and 50 especially for anisotropic rocks, so that errors of up to 100 percent are possible in using an arbitrary ratio value to predict compressive …
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Compressive Strength of Concrete -Cube Test, Procedure, …
ResultConcrete compressive strength for general construction varies from 15 MPa (2200 psi) to 30 MPa (4400 psi) and higher in commercial and industrial structures. Compressive strength of concrete depends on many factors such as water-cement ratio, cement strength, quality of concrete material, quality control during the …
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Shear strength criteria for rock, rock joints, rockfill and rock …
ResultThe actual shear strength of rock masses, ... For this method, an estimate of UCS (uniaxial compressive strength) ... These much simpler Q-based estimates have the advantage of not requiring software for their calculation – they already exist in the Q-parameter logging data, and the effect of changed …
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Rock mass properties
Resultuniaxial compressive strength σci of the intact rock pieces, value of the Hoek-Brown constant mi for these intact rock pieces, and value of the Geological …
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Confined compressive strength model of rock for drilling …
Result4. Calculation of the confining pressure at the bottom hole. A laboratory study on the drilling rate of a permeable formation was carried out by Cunningham et al. [14], and a phenomenon in which the drilling rate decreases as the mud column pressure increases was observed.They explained that the increasing …
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Determination and applications of rock quality designation …
ResultKulhawy and Goodman (1987) suggested that, as a first approximation, the unconfined compressive strength σ cm of rock masses be taken as 0.33σ c when RQD is less than about 70% and then linearly increase to 0.8σ c when RQD increases from 70% to (see Fig. 8), where σ c is the unconfined …
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Summary of the Transformational Relationship between …
ResultThe uniaxial compressive strength (UCS) of rock has been recognized as one of the major technical factors of rock-related engineering constructions [1,2,3], and it has also been regarded as the basic parameter of geotechnical engineering designs and constructions [].Moreover, UCS has been …
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Relationship between rock uniaxial compressive strength and digital
ResultThe rock uniaxial compressive strength (UCS) is the basic parameter for support designs in underground engineering. In particular, the rock UCS should be obtained rapidly for underground engineering with complex geological conditions, such as soft rock, fracture areas, and high stress, to adjust the excavation and …
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A novel equation for calculating uniaxial compressive …
ResultUCS test. This experiment is conducted in the strength and rock mass classifications of rock specimens with a cylindrical shape, as well as the …
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Closed-Form Equation for Estimating Unconfined Compressive Strength …
ResultThe unconfined compressive strength (UCS) of rocks is undoubtedly a key input parameter of numerous constitutive models predicting the stress of rocks (Hoek and Brown 1980, 1997, 2019; Hoek 1983; Hoek et al. 2002).Determining the UCS of a rock sample in the laboratory requires specialist …
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Prediction of Uniaxial Compressive Strength of Rock Using …
ResultThe uniaxial compressive strength (UCS) of the rock is one of the most important rock properties in geotechnical and mining engineering. UCS of rock is the one essential parameter used for the characterization of the rock mass in various systems such as rock mass rating (RMR), Q-system, and Hoek–Brown …
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Determination and applications of rock quality designation …
ResultFirst, various methods for determining RQD are presented and the effects of different factors on determination of RQD are highlighted. Then, the …
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Triaxial Compression Test in Rock | Geoengineer
ResultTriaxial tests are widely used in geotechnical engineering both in soil and rock mechanics. Specimens are axially loaded to failure while a confining pressure is constantly applied. As a result, the behavior of geomaterials is investigated in a three-dimensional stress state. The principal stresses (the maximum and minimum …
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Frontiers | A Comparative Study of Six Hybrid …
ResultUniaxial compressive strength (UCS) is a significant parameter in mining engineering and rock engineering. The laboratory rock test is time-consuming and economically costly. Therefore, developing a …
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Compressive strength values of rock materials.
ResultThe strength of rocks and soil is a crucial design parameter in engineering projects, and it can be determined through various test methods such as uniaxial compressive strength, tensile strength ...
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New Confined Comopressive Strength Calculation …
ResultAs mentioned above, there is a widely practiced and accepted rock mechanics method for calculating CCS of rock. It is as follows: CCS = UCS + DP +2DPsinFA/(1-sinFA) (1) where: UCS = rock unconfined compressive strength DP = differential pressure (or confining stress) FA = rock internal angle of friction.
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IS 13365-1 (1998): Quantitative classification system of …
Resultcompressive strength is preferred over that of point load index strength. 3.1.2 Rock Quality Designation (RQD) Rock quality designation (RQD) should be determined as specified in IS 11315 (part 11). The details ofrating are given in Annex B (Item Il), Where the rock cores are not available, RQD can be determined with …
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Empirical Estimation of Uniaxial Compressive Strength of Rock…
ResultThe uniaxial compressive strength (UCS) is a mechanical property of intact rocks that is important in civil and mining engineering works (Aladejare 2020; Aladejare et al. 2020; Wang and Aladejare 2016a).Design and stability analysis of underground excavations and other geotechnical structures require the input of …
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Using the point load test to determine the uniaxial compressive …
ResultThe rock quality was examined as follows: as field tests, the rock compressive strength was determined by means of point load test and rebound hammer, as laboratory method the Los Angeles test ...
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Empirical relations between rock strength and physical …
ResultTheseequationscanbeusedtoestimaterockstrengthfromparametersmeasurablewithgeophysicalwelllogs.Theabilityofthese equationstofitlaboratory …
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Estimation of uniaxial compressive strength of rock
Result1. Introduction. Uniaxial compressive strength (UCS) is one of the most widely used rock mechanical parameters in rock engineering like design and construction of foundations, tunneling, slope stability investigations, etc. UCS is also the only parameter to assess rock material strength in Rock Mass Rating (RMR) …
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8. STRENGTH OF SOILS AND ROCKS
Resultout for rock. In a direct tensile strength test a cylindrical rock specimen is stressed along its axis by means of a tensile force. The tensile strength is then calculated as the failure tensile force divided by the cross-sectional area. It has been found that a rock core will split along a diameter when loaded on its side in a compression …
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USING THE POINT LOAD TEST TO DETERMINE THE …
ResultThe point load test (PLT) is an accepted rock mechanics testing procedure used for the calculation of a rock strength index. This index can be used to estimate other rock strength parameters. 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 …
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Rock Strength
ResultThe tensile strength of rock is defined as the pulling force, required to rupture a rock sample, divided by the sample's cross-sectional area. The tensile strength of rock is very small and is of the order of 0.1 times the compressive strength. Thus, a rock material is more likely to fail in tension than in compression.
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STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES
ResultThe compressive strength of rock is a function of the confining pressure. As the confining pressure increases so does the strength. Goodman, Intro to Rock …
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Determining Method of Tensile Strength of Rock Based on …
ResultMeasuring-while-drilling has been considered as an effective method to determine the mechanical properties of rock. In this paper, drilling models are improved for predicting the rock strength on the basis of nonlinear M-C criterion. The analytical relationship between the ratio of unconfined compressive strength …
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