MP 212.01.21 TEST METHOD FOR UNCONFINED …

Calculate the compressive strength of the specimen as described in section 6.2 and express the result to the nearest 10 psi (0.1 MPa). Physical description of the rock specimen (type, color, …

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Unconfined Compressive Strength of Vermont Rock

1.1. This method of test is intended for use in determining the uniaxial compressive strength of rock core samples collected from Agency projects. 2. REFERENCE DOCUMENTS 2.1. ASTM D7012 - 10 Standard Test Method for Compressive Strength and Elastic Moduli of Intact Rock Core Specimens under Varying States of Stress and Temperatures. 2.2.

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Triaxial Compression Test in Rock

where σ ci is the uniaxial compressive strength, m i is a constant based on the rock type, σ 1 and σ 3 are the principal stresses. After conducting at least 3 triaxial tests in different lateral pressures, the best-fit envelopes of the criterion …

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Unconfined Compression Test

The Unconfined Compression Test is a laboratory test used to derive the Unconfirmed Compressive Strength (UCS) of a rock specimen. Unconfirmed …

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Standard Test Method for Compressive Strength and Elastic Moduli …

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1990. Eight sandstones, three limestones, one dolomite, one marble and one syenitic gneiss were tested to evaluate the correlations between the compressive strength values, as determined by the standard uniaxial compression test, and the corresponding results of the point load, the …

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Indirect Estimation of Rock Uniaxial Compressive Strength

Uniaxial compressive strength is an important mechanical parameter for rock mass engineering. Hence, how to determine the UCS simply and accurately have drew numerous attention. In this paper, the references related to UCS estimation using indirect tests were reviewed, and three stages of the development of indirect UCS estimation were classified. …

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Mechanical analysis and failure modes prediction of composite rock

The compressive strength of the interlayer in the type I composite rock specimen was lower than that in type II composite rock specimen. A schematic diagram of type I and type II is shown in Fig. 2 .

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Standard Test Method for Unconfined Compressive Strength of Intact Rock

1.1 This test method specifies the apparatus, instrumentation, and procedures for determining unconfined compressive strength of intact rock core specimens. 1.2 The values stated in inch-pound units are to be regarded as the standard. The SI values given in parentheses are for information only.

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Reverse Size Effect of the Unconfined Compressive Strength of

Due to the size effect, it is essential to first determine the mechanical parameters of experimental-scale rocks and then select appropriate models to extrapolate to the engineering scale for engineering design. Although extensive research have been conducted on the size effect of rocks, the mechanism for the observed strength reverse size effect of crystalline rock is still …

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Suggested methods for determining the uniaxial compressive strength …

Standard method of test for unconfined compressive strength of rock core specimens. American Society for Testin 9 and Materials. ASTM Designation D-2938-71a. 5. Hawkes I. & Mellor M. Uniaxial testing in rock mechanics labor- atories. Enfln~j. Geol. 4, July 1970, pp. 177-285, 3. PROCEDURE (a) to (e)--See Part 1.

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Scale effects in rock strength properties. Part 1: Unconfined

strength of intact rock core specimens. D 2938: 390–391 . ... The test results show that the uniaxial compressive strength of rock sample increases first and then tends to be stable with the ...

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A discussion on the decrease of unconfined compressive …

strength Fig 2 Unconfined compressive strength vs. water content for clay shales (Hsu and Nelson, 1993) Ballivy and Colin (1999) have analyzed the in-crease in triaxial strength related to changes in the dielectric constant of the fluid saturating the rock. In a propane storage cavern in shale the tension strength of the rock increased 150-200% ...

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Statistical Method for Assessing the Uniaxial Compressive Strength …

Rock Mechanics and Rock Engineering - In this respect, R can be considered as a rapid and cheap indirect measure of compressive strength, but it often shows a large scatter due to the uncertainties pertaining the testing technique, the inherent variability of rock properties, and the transformation model from R to σ c. In this paper, the authors propose a new empirical …

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D5731 Standard Test Method for Determination of the Point Load Strength

Significance and Use 5.1 The uniaxial compression test (see Test Method D7012) is used to determine compressive strength of rock specimens. However, it is a time-consuming and expensive test that requires significant specimen preparation and the results ... 5.4 Rock specimens in the form of either core (the diametral and axial tests), cut ...

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Unconfined Compressive Strength of Intact Rock Core …

Uncon®ned Compressive Strength of Intact Rock Core Specimens 1 This standard is issued under the ®xed 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 reapproval. A

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Standard Test Methods for Compressive Strength and Elastic …

5.2 Method C, uniaxial compressive strength of rock is used in many design formulas and is sometimes used as an index property to select the appropriate excavation technique. Deformation and strength of rock are known to be functions of confining pressure. Method A, triaxial compression test, is commonly used to simulate the stress conditions under which …

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Relationship between rock uniaxial compressive strength and …

The 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 ...

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Suggested methods for determining the uniaxial compressive …

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 specimen of regular …

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Compressive Strength and Elastic Moduli of Intact Rock Core …

Measurements; D2938 Uncon®ned Compressive Strength of Intact Rock Core Specimens; and D3148 Elastic Moduli of Intact Rock Core Specimens in Uniaxial Compression. The original four standards are now referred to as Methods in this standard. 1.5.1 Method AÐTriaxial Compressive Strength of Und-rained Rock Core Specimens Without Pore Pressure ...

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HOW TO CALCULATE CORE RECOVERY AND RQD OF ROCK?

Core Recovery and RQD (Rock Quality Designation) The easiest way to characterize the amount of material recovered during rock coring is to calculate "core recovery" as the amount (i.e. length) of recovered material divided by the total length of the core run (presented as a percentage). Rock Quality Designation (RQD) is a modified core recovery percentage in …

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Development of empirical equations between uniaxial …

Uniaxial compressive strength test. Cylindrical core samples with diameters ranging between 47.35 and 66.40 mm were prepared using an automatic double-blade rock-core cutting machine (SCQ-4 A ...

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Standard Test Method for Unconfined Compressive Strength of Intact Rock

Scope1.1 This test method specifies the apparatus, instrumentation, and procedures for determining unconfined compressive strength of intact rock core specimens.1.2 The values stated in inch-pound units are to be regarded as the standard. The SI values gi

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IS 9143 (1979): Method for the determination of unconfined …

UNCONFINED COMPRESSIVE STRENGTH OF ROCK MATERIALS 0. FOREWORD 0.1 This Indian Standard was adopted by the Indian Standards Inrtitu- tion on 23 March 1979, after the draft finalized by the Soil Engineering ... the laboratory, it is mainly intended for field measurements on rock core and outcrop specimens. The apparatus used in the test is light and

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Triaxial Compression Test in Rock

Triaxial 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 …

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Statistical Method for Assessing the Uniaxial …

Rock Mech Rock Eng (2013) 46:199–206 DOI 10.1007/s00603-012-0230-5 TECHNICAL NOTE Statistical Method for Assessing the Uniaxial Compressive Strength of Carbonate Rock by Schmidt Hammer Tests Performed on Core …

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A review of test methods for uniaxial compressive strength of …

The uniaxial compressive strength (UCS) of rocks is a vital geomechanical parameter widely used for rock mass classification, stability analysis, and engineering design in rock engineering.

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Standard Test Method for Compressive Strength of …

D4543 Practices for Preparing Rock Core as Cylindrical Test Specimens and Verifying Conformance to Dimensional and Shape ... 6.2 Compressive strength testing of specimens in more than two orientations with respect to splitting, including: rift (plane of easiest splitting), grain (plane of next easiest splitting), and head grain (plane of ...

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Unconfined Compressive Strength Test of 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.

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D2664 Standard Test Method for Triaxial Compressive Strength …

Scope1.1 This test method covers the determination of the strength of cylindrical rock core specimens in an undrained state under triaxial compression loading. The test provides data useful in determining the strength of rock, namely: shear strengths at v

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UNCONFINED COMPRESSIVE STRENGTH TESTS ON …

Unconfined Compressive Strength ofIntact Rock Core Specimens ASTM D 7012·04 ProjectName: ProjectNumber: Boring Number: Sample Depth (ft): Tested By: Test Date: North Anna COL 6468061472 901 54 Jacob B. Mock 12/1/2006 Reviewed By: Review Date: P5C 1-, 9-Q7 Rock Type Quartz Gneiss Moisture Condition As Received Specimen Diameter, inch 2.492 ...

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