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Rock Mechanics

Compressive Strength!! Tensile strength = resistance to failure under tensile stress ! Typically much lower than compressive strength • 10% of compressive strength typical (Table 7.2) ! Horizontal rock beams can be dangerous because of the weak tensile strength – rock unit must be homogeneous and composed of resistant minerals

Suggested Methods for Determining the Uniaxial …

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 used for ...

Compressive strength - Wikipedia

Compressive strength or compression strength is the capacity of a material or structure to withstand loads tending to reduce size, as opposed to which withstands loads tending to elongate. In other words, compressive strength resists being pushed together, whereas tensile strength resists tension (being pulled apart). In the study of strength of materials, tensile strength, compressive ...

Laboratory Testing and Interpretation of Rock Properties

Figure 8-2: Uniaxial Compression Test on Rock with (a) Definitions of stress conditions and strains, (b) Derived stress-strain curve with peak stress corresponding to the uniaxial compressive strength (qu = F u) Commentary The uniaxial compression test is most direct means of determining rock strength. The

Standard Test Method for Splitting Tensile Strength of ...

Standard Test Method for Splitting Tensile Strength of Intact Rock Core Specimens1 This standard is issued under the fixed designation D 3967; 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 ...

Standard - Standard Test Method for Compressive Strength ...

Standard Test Method for Compressive Strength and Elastic Moduli of Intact Rock Core Specimens under Varying States of Stress and Temperatures Subscribe on standards with our subscription service. When you use our service you can be assured the latest editions and easy access.

IS 9143: Method for the determination ... - Internet Archive

Name of Standards Organization: Bureau of Indian Standards (BIS) Division Name: Civil Engineering Section Name: Rock Mechanics (CED 48) Designator of Legally Binding Document: IS 9143 Title of Legally Binding Document: Method for the determination of unconfined compressive strength of rock materials Number of Amendments: Equivalence: Superceding:

UNCONFINED COMPRESSIVE STRENGTH OF ROCK SAMPLE (IS …

Aug 11, 2013· Reference IS-9143-1979-Method for the determination of unconfined compressive strength of rock materials Objective The objective of this test is to determine unconfined compressive strength of rock. This test is primarily done to classify the rock on the basis of strength. Apparatus used Name of equipment Capacity Least count/Accuracy Loading Machine 5000 kN 2.5 N Vernier […]

Standard Test Method for Unconfined Compressive …

tion, 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. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use ...

Laboratory Testing of IntactLaboratory Testing of Intact …

Objectives: Lab Testing of RkRock • Recognize why and when to test intact rock • Locate & review standard lab testing procedures for indexing parameters of strength, stiffness, and durability. • Select reppp gresentative specimens for testing • Recognize importance of QA/QC for

USING THE POINT LOAD TEST TO DETERMINE THE UNIAXIAL ...

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 ...

STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1 ...

if a rock mass is cut by directional joint sets, the rock mass strength is anisotropic. Rock mass strength is scale dependent and varies with the volume of rock under consideration. The modes of failure of intact rock are multiple. Rock can fail in tension, compression or shear.

ASTM D7012 - 14 Standard Test Methods for Compressive ...

D7012 - 14 Standard Test Methods for Compressive Strength and Elastic Moduli of Intact Rock Core Specimens under Varying States of Stress and Temperatures, bulk modulus, compression testing, compressive strength, confined compression, elastic moduli, loading tests, modulus of elasticity, Mohr stress circle, Poisson&rsquo,s ratio, repeatability, reproducibility, rock, shear modulus, triaxial ...

Estimating the uniaxial compressive strength of a volcanic ...

International Journal of Rock Mechanics & Mining Sciences 43 (2006) 554–561 Estimating the uniaxial compressive strength of a volcanic bimrock H. Sonmeza,, C. Gokceoglua, E.W. Medleyb, E. Tuncaya, H.A. Nefesliogluc aDepartment of Geological Engineering, Applied Geology Division, Hacettepe University, 06532 Beytepe, Ankara, Turkey

Unconfined Compression Test | Geoengineer.org

Table 2: Typical values of Uniaxial Compressive Strength for a various number of rocks (from Attewell & Farmer 1976). References. ASTM D7012-14e1, (2014).Standard Test Methods for Compressive Strength and Elastic Moduli of Intact Rock Core Specimens under Varying States of Stress and Temperatures, ASTM International, West Conshohocken, PA.

ASTM D7012 - 14e1 Standard Test Methods for Compressive ...

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 most underground rock masses exist.

8. STRENGTH OF SOILS AND ROCKS

towards any other strength parameter. (Bishop, 1966). In the case of concrete, the compressive strength is the most commonly measured strength parameter and this is also true of rock specimens. For the uniaxial or unconfined compressive strength test a right circular cylinder of the

Compressive Strength - an overview | ScienceDirect Topics

Compressive strength is the standard strength parameter of concrete that can be evaluated under site conditions as well. The most common method is to use cylinder cores drilled off the structure. Momber (1998b) was probably the first to suggest to use the way how a cylinder fails during the compression test as a criterion of the material behaviour during hydrodemolition.

Rock Testing Lab Services, Rock Engineering | GeoTesting ...

Standard Test Method for Compressive Strength and Elastic Moduli of Intact Rock Core Specimens under Varying States of Stress and Temperatures: ASTM D7012D: Uniaxial Compressive Strength, Young's Modulus, Poisson's ratio: Rock, Rock Strength, Rock Unconfined Compressive Strength, Rock Uniaxial Compressive Strength, Elastic Moduli: Details

ASTM D7012 - 14e1 - Standard Test Methods for Compressive ...

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 Strength of Intact ...

Standard Test Method for Unconfined Compressive Strength ...

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.

Rock Testing - Geolabs

Point Load Strength. You provide. If preference, which method is to be used: Axial, diametral or irregular lump. Otherwise we will perform the more logical test. Typical use(s) Classifying strength of rocks, and predicting tensile and compressive strengths. Material required. Core sample 38 mm to 105 mm diameter (or intact block suitable to recore)

(PDF) The point-load strength test - ResearchGate

The Point Load Index is a geomechanical test used to measure rock fragment strength (Broch and Franklin 1972) and has been correlated with rock mass parameters like UCS compressive strength …

Compressive Strength of Concrete & Concrete Cubes | What ...

Compressive strength as per American Codes. In case of American codes, compression strength is defined in terms of cylinder strength fc'. Here compressive strength of concrete at 28 days curing is obtained from a standard cylindrical specimen 150mm diameter and 300mm high loaded longitudinally to failure under uniaxial compression loading.

THE UNIAXIAL COMPRESSIVE STRENGTH OF SOFT ROCK

THE UNIAXIAL COMPRESSIVE STRENGTH OF SOFT ROCK D. S. Agustawijaya Lecturer, Department of Civil Engineering, Faculty of Engineering, Mataram University, Mataram, Indonesia Email: [email protected] ABSTRACT Soft rock is a term that usually refers to a rock material with a uniaxial compressive strength (UCS) less than 20 MPa.

Compressive strength of rocks - PetroWiki

Estimating compressive strength. General rock failure criterion can be reduced to a few parameters dependent on lithology (m) and the uniaxial compressive strength (C 0).Lithology is commonly derived during log analysis, so m may be estimated (Table 1).What is needed still is an initial measure of rock strength provided by C 0. C 0 can be estimated from porosity or sonic velocities, but many ...

Uniaxial Compressive Strength - an overview ...

The uniaxial compressive strength of a rock under static loading often decreases with an increasing temperature at which the rock has been heat-treated before strength testing. This conclusion is drawn from a great number of experiments [1,2,4,8,9,11,17–19].The higher the temperature is, the lower the strength. Some results for uniaxial compressive strength σ c and tensile strength σ t ...