The uniaxial compressive strength (UCS) of rock is widely used in various engineering projects performed in rock environment. Although the method is relatively simple, it is time consuming and expensive. It also requires well-prepared rock cores. For this
the Uniaxial Compressive Strength and Deformability of Rock Materials PART 1. SUGGESTED METHOD FOR DETERMINATION OF THE UNIAXIAL COMPRESSIVE STRENGTH OF ROCK MATERIALS 1. SCOPE This method of test is intended to measure the uni- axial compressive strength of a rock sample in the form of specimens of regular geometry. The test is mainly
Determination of c and Φ of rocks from indirect tensile strength and uniaxial compression tests Article (PDF Available) in International Journal of Geotechnical Engineering 8(1):59-65 · January
Uniaxial compressive strength (UCS) is a key physical test relevant to iron ore crusher design and rock geomechanics for mining. Tests are typically performed on intact lengths of NQ, HQ, or PQ diamond drill core and record the maximum axial load sustained at the point of failure.
1. Introduction. The determination of basic mechanical properties of rocks is crucial to a specific engineering project. Several mechanical properties, including uniaxial compressive strength (UCS), have become widely accepted parameters for rock design projects (Baskerville, 1987).From past to present, direct and indirect methods have been used to determine UCS of rocks in field and laboratory.
strength is the most commonly measured strength parameter and this is also true of rock specimens. For the uniaxial or unconfined compressive strength test a right circular cylinder of the material is compressed between the platens of a testing machine as illustrated in Fig. 8.1. The compressive strength is then defined as the maximum load
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.
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
CALCULATIONS (a) The uniaxial compressive strength of the specimen shall be calculated by dividing the maximum load car- ried by the specimen during the test, by the original cross-sectional area. 1. SCOPE This method of test is intended to determine stress- strain curves and Young's modulus and Poisson's ratio in uniaxial compression of a rock
13/08/2018· (2) Does the saturation have more effect on the strength or on the deformation modulus? This matter has been discussed in this stone by conducting uniaxial compressive strength tests on 78 rock samples from 4 different lithologies in two dry and saturated conditions. The results showed that the compressive strength and the modulus of
The uniaxial compressive strength–point load index relation was studied for pyroclastic rocks. • Very strong exponential relations were found uniaxial compressive strength and point load index. • The results were compared to the studies in the literature.
STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1. INTRODUCTION 2. TESTING OF INTACT ROCK FOR STRENGTH 2.1 Uniaxial Compression 2.2 Point Load Testing 2.3 Uniaxial Tension 2.4 Indirect Tension Tests 2.5 Shear Tests 2.6 Confined Compression Tests (Triaxial Tests) 2.7 Biaxial and Multiaxial Tests 2.8 Other Tests 3. PARAMETERS AFFECTING ROCK STRENGTH 4. FAILURE CRITERIA FOR INTACT ROCKS AND ROCK
This test method specifies the apparatus, instrumentation, and procedures for determining unconfined compressive strength of intact rock core specimens. This procedure is identical to ASTM D 2938 except that the cores are tested after cutting without grinding, and neoprene caps are used on the specimen ends. Unconfined Compressive Strength Test Procedure Check the ability of the
Uniaxial compressive rock strength determination Rebound hardness is perhaps the most frequently method used in rock testing to determine uniax-ial compressive strength (UCS). Proceq's RockSchmidt provides not only the possibility of obtain-ing the UCS, but also of sending the complete register data and report direct to the computer.
Standard Test Method for Unconﬁned Compressive Strength of Intact Rock Core Specimens1 This standard is issued under the ﬁxed designation D 2938; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last
PDF On Apr 24, 2019, S. Ranjbar and others published Determination of Uniaxial Compressive Strength of Granite Rock Samples using Electrical Resistivity Measurement: NDT Find, read and cite
Determination of c and w of rocks from indirect tensile strength and uniaxial compression tests N. Sivakugan*1, B. M. Das2, J. Lovisa1 and C. R. Patra3 Cohesion (c) and friction (w) angle are the
The determination of uniaxial compressive strength from point load strength for pyroclastic rocks Article in Engineering Geology 170 · February 2014 with 846 Reads How we measure 'reads'
The determination of uniaxial compressive strength from point load strength for pyroclastic rocks. S.B. CelikEstimation of uniaxial compressive strength from point load strength, A. BasuEstimation of uniaxial compressive strength of rock materials by index tests using regression analysis and fuzzy inference system.
Abstract. Point-load strength (Is) as a measure for the determination of rock strength and for estimating uniaxial (unconfined) compressive strength (UCS) are described and both put together and used for rock strength classification of brittle and hard rocks.
Abstract. Point-load strength (Is) as a measure for the determination of rock strength and for estimating uniaxial (unconfined) compressive strength (UCS) are described and both put together and used for rock strength classification of brittle and hard rocks.
Determination Of The Uniaxial Compressive Strength Of The Given Rock Materials. Scope:-This method of test is intended to measure the uniaxial compressive strength of a rock sample in the form of specimens of regular geometry. The test is mainly intended for strength classification and characterization of intact rock. Apparatus:-A suitable machine shall be used for applying and
ISRM Suggested Methods are "explanations of recommended procedures to follow in the various aspects of rock characterisation, testing and monitoring"*. The ISRM Suggested Methods downloaded are for the personal use of ISRM members. A complete list of all Suggested Methods is provided here.
AS 4133 4.2.1 Determination of Uniaxial Compressive Strength of Rock (>50 MPa) AS4133 4.2.2 Determination of Uniaxial Compressive Strength of Rock (<50 MPa) AS 4133 4.2.1 & 4.3.1 Determination of Uniaxial Compressive Strength and Deformability of Rock Material (Young’s Modulus & Poisson’s Ratio) (>50 MPa)
1.1 These four test methods cover the determination of the strength of intact rock core specimens in uniaxial and triaxial compression. Methods A and B determine the triaxial compressive strength at different pressures and Methods C and D determine the unconfined, uniaxial strength.
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USING THE POINT LOAD TEST TO DETERMINE THE UNIAXIAL COMPRESSIVE STRENGTH OF COAL MEASURE ROCK John Rusnak, Director of Geology Peabody Group St. Louis, MO Christopher Mark, Rock Mechanics Team Leader National Institute for Occupational Safety and Health Pittsburgh, PA ABSTRACT Point load testing is used to determine rock strength indexes in geotechnical practice.
AS 4133.4.3.2-2013 Methods of testing rocks for Method 4.3.2: Rock strength tests— Determination of the deformability of rock materials in uniaxial compression—Rock strength less than 50 MPa 1 SCOPE This Standard sets out the method for determining uniaxial compressive strength, the stress-strain characteristics, Young's modulus and Poisson's ratio of a rock sample in
Figure 8-2: Uniaxial Compression Test on Rock with (a) Definitions of stress conditions and strains, (b) Derived stress-strain curve with peak stress corresponding to the uniaxial compressive strength (qu = F u) Commentary The uniaxial compression test is most direct means of determining rock strength
An understanding of rock strength is important for designing recovery plans for a reservoir and for developing an appropriate reservoir simulation.A detailed discussion of rock failure can be found in Rock failure relationships and Compressive strength of rocks.But the data needed for these methods may not be readily available, so there is a desire to use data available from well logs that are
1.1 These four test methods cover the determination of the strength of intact rock core specimens in uniaxial and triaxial compression. Methods A and B determine the triaxial compressive strength at different pressures and Methods C and D determine the unconfined, uniaxial strength.
Figure 8-2: Uniaxial Compression Test on Rock with (a) Definitions of stress conditions and strains, (b) Derived stress-strain curve with peak stress corresponding to the uniaxial compressive strength (qu = F u) Commentary The uniaxial compression test is most direct means of determining rock strength
The validity of using laboratory uniaxial compression tests to determine the long-term strength of rock is considered. Results of an experimental study on three types of rocks are analysed, and the usefulness and limitations of the approach are discussed. Different methods of estimating strength are used and the results compared.
** Point load tests on rocks with a uniaxial compressive strength below 25 MPa are likely to yield highly ambiguous results. Table 3: Values of the constant m i for intact rock, by rock group. Note that values in parenthesis are estimates. Rock mass properties 7 . Rock mass properties 8 Anisotropic and foliated rocks such as slates, schists and phyllites, the behaviour of which is dominated by
s = constant depending on the characteristics of the rock mass, σc = uniaxial compressive strength of the intact rock material, σ1 = major principal stress at failure, and σ3 = minor principal stress at failure. The uniaxial compressive strength for the rock mass, σc, rockmass,can be expressed by setting σ3 = 0 in Equation 2.1 thus obtaining
Rock mechanics is an important field of geotechnical engineering as it is the theoretical and applied science concerning the physical behavior of rocks and rock masses. Slopes, tunneling, dams foundations and surface constructions requires the characterization of involved rocks and the analysis of their reaction to induced stresses.
tensile strength but not to the uniaxial compressive strength of rocks. Besides this, ice also acted as an Fig.7-;-Tensile fracture in Chunar sandstone during uniaxial compression test Fig.8-Cone shear fracture in Makrana marble during uniaxial compression test adhesive material and contributed to the tensile strength of the rocks.
A predictive model for uniaxial compressive strength of carbonate rocks from Schmidt hardness Abstract Uniaxial compressive strength (UCS) is considered to be one of the important parameters in rock engineering projects. In order to determine UCS, direct and indirect techniques are
Laboratory Testing of RocksLaboratory Testing of Rocks • Index testing of intact rock materials for identification & classification. •Strength and stiffness characteristics • Degradation potential; Durability • Used in assessing the overall RockUsed in assessing the overall Rock Mass
Compressive strength or compression strength is the capacity of a material or structure to withstand loads tending to reduce size, as opposed to tensile strength, which withstands loads tending to elongate.In other words, compressive strength resists compression (being pushed together), whereas tensile strength resists tension (being pulled apart). In the study of strength of materials