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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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 …
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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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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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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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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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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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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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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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The uniaxial compressive strength (UCS) is classified as one of the basic mechanical properties of rocks, which is widely used in mining and construction practice.
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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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