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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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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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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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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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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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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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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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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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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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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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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Intact rock core specimens are cylindrical samples of sediment or rock drilled from the ground. Labs need to test intact rock core that is representative of the true strength of the ground intended for the structure, which means the specimens must represent the original rock formation. This requires sampling the …
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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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Uniaxial compressive and tensile strengths are considered key properties for characterising rock material in engineering practice. They are determined, directly and indirectly, as described by the International Society for Rock Mechanics (ISRM) and the American Society for Testing Materials (ASTM) ().The point load strength index (PLSI), an indirect strength test, …
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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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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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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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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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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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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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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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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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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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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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compressive strength (UCS) of rock materials is the length to diameter ratio (L/D) of test cores. ASTM recommends a ... Rock core specimens with L/D ratios 1, 1.5, 2, and 2.5:1 were extracted from the basalt, pink and grey andesites, tuff, limestone, siltstone and marble. In each case, the
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the uniaxial compressive strength (UCS), and to propose appropriate Is50 to UCS conversion factors for different coal measure rocks. The rock strength determined by the PLT, like the load frame strengths that they estimate, are an indication of intact rock strength and not necessarily the strength of the rock mass. THE UNIAXIAL COMPRESSIVE ...
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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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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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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 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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