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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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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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Astm d2938 unconfined compressive strength | PDF

1. Designation: D 2938 – 95 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 …

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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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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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Module 2: Physico-Mechanical Properties of Rocks

The uniaxial compressive strength is the value of compressive stress at which the specimen fails. The compressive strength is usually obtained by compression testing machine. This test is usually conducted in straight circular cylindrical having height to diameter ratio of 2.0 3.0 and diameter preferably of not less than NX core size (approx. 54 -

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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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Determination and applications of rock quality designation (RQD)

Kulhawy 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 compressive strength of the intact rock.

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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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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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Standard Test Methods for Compressive Strength and Elastic …

1.5 This standard replaces and combines the following Standard Test Methods: D2664 Triaxial Compressive Strength of Undrained Rock Core Specimens Without Pore Pressure Measurements; D5407 Elastic Moduli of Undrained Rock Core Specimens in Triaxial Compression Without Pore Pressure Measurements; D2938 Unconfined Compressive …

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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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Statistical Method for Assessing the Uniaxial Compressive Strength …

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 Samples G. Bruno • G. Vessia • L. Bobbo Received: 5 September 2011 / Accepted: 12 February 2012 / Published online: 6 March 2012 Ó ...

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Correlation Between Point Load Index and Uniaxial Compressive Strength

ASTM (1984) American Society for testing and materials. Standard test method for unconfined compressive strength of intact rock core specimens. Soil and rock, building stones: annual book of ASTM standards, 4.08, Philadelphia, Pennsylvania. Barton NR, Lien R, Lunde J (1974) Engineering classification of rock masses for the design of tunnel support.

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Method for Determining the Unconfined Compressive …

This method specifies the apparatus, instrumentation, and procedures for determining unconfined compressive strength of intact rock core specimens. This procedure is identical to ASTM D …

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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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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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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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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 …

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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Compressive Strength and Elastic Moduli of Intact Rock Core …

Measurements; D2938 UnconÞned 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 A: Triaxial Compressive Strength of Undrained Rock Core Specimens Without Pore Pressure …

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Test Method for Unconfined Compressive Strength of …

method for compressive strength of cylindrical concrete specimens . CS1:2010 Construction Standard Testing concrete . Current - ASTM D2938-95 Standard test method for unconfined compressive strength of intact rock core specimen . Replaced . ASTM D7012-14 Standard test method for compressive strength and elastic moduli of intact rock core specimens

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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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A review of test methods for uniaxial compressive strength of …

In rock engineering, the UCS is a key parameter to determine the compressive strength, which is widely used in numerical modeling, geophysical prospecting, geomechanics, …

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ASTM D2938

ASTM D2938 provides a standardized procedure for determining the unconfined compressive strength of cylindrical rock core specimens. Key points of ASTM D2938: Specimen …

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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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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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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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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 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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