determination uniaxial compressive strength of rocks

Suggested Methods for Determining the Uniaxial Compressive

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 intended for strength classification and characterization of intact rock. 2. APPARATUS (a) A suitable machine shall be

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The determination of uniaxial compressive strength from

20/02/2014· 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 reason, indirect tests are frequently used to predict the UCS for preliminary studies. Among the indirect tests, the point load test is

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Uniaxial compressive rock strength determination

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. Classifying rocks with RockSchmidt is extremely easy,

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The determination of uniaxial compressive strength from

The determination of uniaxial compressive strength from point load strength for pyroclastic rocks. February 2014 ; Engineering Geology 170; DOI: 10.1016/j.enggeo.2013.12.009. Authors: Sair

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THE UNIAXIAL COMPRESSIVE STRENGTH OF SOFT ROCK

The term soft rock is often referred to rock materials with a uniaxial compressive strength (UCS) lower than that of hard rocks and higher than that of soils. A rock material can be classified as a soft rock if it has a uniaxial compressive strength below 20 MPa, determined directly by uniaxial compression

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8. STRENGTH OF SOILS AND ROCKS

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 applied to crush the specimen divided by the cross-sectional area. Rock strength has been found to be size dependent because of the cracks and

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STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1

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 MASSES 4.1 Mohr Criterion

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Lecture 9 Introduction to Rock Strength David Hart

UNIAXIAL COMPRESSIVE STRENGTH C o (x 1000 psi) 0 50 100 150 SPECIMEN LENGTH L (in.) VARIATION OF COMPRESSIVE STRENGTH WITH SIZE C o = 35 x L-0.14 In this plot of the size effect on strength, a power function was used to best-fit the experimental data. NOTE, however, that beyond L=36 in. the size effect ceases to be of much consequence.

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THE UNIAXIAL COMPRESSIVE STRENGTH OF SOFT ROCK

The term soft rock is often referred to rock materials with a uniaxial compressive strength (UCS) lower than that of hard rocks and higher than that of soils. A rock material can be classified as a soft rock if it has a uniaxial compressive strength below 20 MPa, determined directly by uniaxial compression

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DETERMINATION OF UNIAXIAL COMPRESSIVE STRENGTH OF LIMESTONE

Uniaxial Compressive Strength (UCS) defines mechanical strength of the intact rock material and it is one of the most used parameters in rock engineering. In the laboratory, it is determined by uniaxial compression on circular cylinder specimens according to standardized test procedures [1, 2]. However, as sometimes cylindrical intact rock specimens are

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Uniaxial Compression Test University of Sistan and

An empirical correlation between the Schmidt rock hardness and uniaxial compressive strength has been obtained based on a large number of tests on different rocks: log C (psi ) 0.00014 (lb /ft ) H 3.16 Smdt 3 0 dry = ×γγγγ × + UCS = 6.9 ×10 [ 0.16 + 0. 0087 (HS×γw)] L / 3 L / 3 L / 3 P P / 2 P / 2 D Rock Core 3 peak MR 3 D 16 P L T π× × × =

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8. STRENGTH OF SOILS AND ROCKS

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 applied to crush the specimen divided by the cross-sectional area. Rock strength has been found to be size dependent because of the cracks and fissures that are often

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Compressive strength of rocks PetroWiki

04/06/2015· Using this critical porosity, we derive a uniaxial compressive strength..(5) This C 0 equation is plotted in Fig. 2 along with the modified Scott and Jizba equations and data of Dobereiner and DeFreitas. Compaction strength. After a threshold region the rock begins to show ductile deformation under confining pressure. The pressure under which a rock deforms is known as its compaction strength.

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Determination of compressive strength of rocks using

1. Central Mining And Fuel Research Institute Regional Centre, Nagpur, Google Scholar; 2. Ergul Yasar & Yasin Erdogan, Correlating sound velocity with the density, compressive strength and Young’s Modulus of Carbonate Rocks International Journal of Rock Mechanics and Mining Science –July (2004). Google Scholar Crossref; 3. P.B. Choudhary and T.G. Sitharam Ground Chracterization using shear

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Rock Strength (Shear strength, compressive strength

1-F Rock Strength How We Measure Rock Strength Simple measurements (called “index ” tests) Uniaxial Compressive Strength (UCS), σ′3 = 0 Tensile strength (pure tension, hard for rocks!) Indirect tensile test (Brazilian test) Point-load, beam-bending, scratch

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(PDF) Determination of mechanical properties of rocks

The diametric point load test was carried out on cylin- A 3000 kN-ELE auto compression machine was used drical specimens with a diameter of 50 mm and a length of for the uniaxial compressive strength (UCS) tests which 100 mm. Five specimens of each rock type were tested; the were performed on 42 9 85 mm cylindrical specimens average values are given in Table 1. Table 1 Result of the tests Rock

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Rock mass properties Rocscience Inc.

** 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

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A STUDY ON MODES OF ROCK FAILURE UNDER UNIAXIAL COMPRESSION

2.2. Failure in Uniaxial Compression: Rock examines under uniaxial compressive anxiety, on account of uneasiness centers around minor discontinuities, can fail in strain, in shear or in coupling of the weight and shear stresses. It relies on upon the presentation of

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