
ASTM D7012  14e1 Standard Test Methods for Compressive
Uniaxial Compressive Strength MPa Point Load Index MPa Schmidt Hardness Type L  hammer Field Estimate of Strength Examples R5 Extremely Strong 250 10 50  60 Rock material only chipped under repeated hammer blows

Rock mass properties  Rocscience
Where is used the uniaxial compressive strength uniaxial compressive strength is common test in rock mechanics this test is very important and so far many relationships are provided to predict it

Measurement of uniaxial compressive strength of rocks
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 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

STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1
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 Unconfined Compressive Strength Test Procedure Check the ability of the spherical …

Correlation between Uniaxial Compressive Strength and
Compressive strength or compression strength is the capacity of a material or structure to withstand loads tending to reduce size as opposed to tensile strength which withstands loads tending to elongate In other words compressive strength resists compression being pushed together whereas tensile strength resists tension being pulled

Compressive strength of rocks  PetroWiki
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

HOW TO CLASSIFY ROCKS ENGINEERING CLASSIFICATION OF
Uniaxial compressive strength of intact rock sci = 100 MPa Geological Strength Index GSI = 40 Constant mi = 10 Using the program RocLab1 the uniaxial compressive strength of the rock mass is calculated as sc = 3 307 MPa and the failure envelope for this rock mass is plotted in Figure 1

uniaxial compressive strength  Schlumberger Oilfield Glossary
Soft rock is a term that usually refers to a rock material with a uniaxial compressive strength UCS less than 20 MPa This low strength range might be influenced by physical characteristics

Rock strength from log parameters  PetroWiki
Uniaxial compressive strength c Emodulus and the factor m i in the HoekBrown failure criterion for rock masses Average values from tests Tests of rocks world of intact rock samples wide Scandinavian rocks tested at SINTEF NTNU Rating of the factor m i c E E c Number of tests c E E c Number

THE UNIAXIAL COMPRESSIVE STRENGTH OF SOFT ROCK
STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1 INTRODUCTION 2 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

UNCONFINED COMPRESSIVE STRENGTH OF ROCK SAMPLE IS …
A measure of a material s strength The uniaxial compressive strength UCS is the maximum axial compressive stress that a rightcylindrical sample of material can withstand before failing It is also known as the unconfined compressive strength of a material because confining stress is set to zero

Testing rock specimen for Uniaxial Compressive Strength
Uniaxial compressive strength UCS is a key physical test relevant to iron ore crusher design and rock geomechanics for mining Tests are typically performed on intact lengths of NQ HQ or PQ diamond drill core and record the maximum axial load sustained at the point of failure

Standard Test Method for Unconfined Compressive Strength
uniaxial compressive strength ci of the intact rock pieces value of the HoekBrown constant m i for these intact rock pieces and value of the Geological Strength Index GSI for the rock mass Intact rock properties For the intact rock pieces that make up the rock mass equation 1 simplifies to 0 5 3 1 3 1

Suggested Methods for Determining the Uniaxial …
Aug 11 2013· U C S Test On Rock Sample Reference IS91431979Method for the determination of unconfined compressive strength of rock materials Objective The objective of this test is to determine unconfined compressive strength of rock

DEFORMABILITY PROPERTIES OF ROCKS AND ROCK MASSES …
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 L0 14 In this plot of the size effect on strength a power function was used to bestfit the experimental data NOTE however that beyond L=36 in the size effect ceases to be of much consequence

Laboratory Testing and Interpretation of Rock Properties
1 12 1952 rock sample Uniaxial compressive strength 72 2277 6597 2 89 Uniaxial tensile strength 12 249 316 1 27 Triaxial strength 13 261t 964 3 69 Modulus ofelasticityt 54 607 3072 5 06 Poisson s ratio j 53 565 2882 5 10 I TOTAL first three I properties 97 2787 7877 2 83 TABLE II SUMMARY OFTHE CSIR ROCK TESTING SERVICES TOTHE MINING

Uniaxial Compressive Strength UCS test  In situ rock
The unconfined compressive strength UCS is the maximum axial compressive stress that a rightcylindrical sample of material can withstand under unconfined conditions—the confining stress is zero It is also known as the uniaxial compressive strength of a material because the application of compressive stress is only along one axis—the

unconfined compressive strength  Schlumberger Oilfield
A predictive model for uniaxial compressive strength of carbonate rocks from Schmidt hardness Abstract Uniaxial compressive strength UCS is considered to be one of the important parameters in rock engineering projects In order to determine UCS direct and indirect techniques are employed In the direct approach

Where is used the uniaxial compressive strength
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

Uniaxial compression tests  SP
DEFORMABILITY PROPERTIES OF ROCKS AND ROCK MASSES 1 INTRODUCTION 2 DEFORMABILITY OF INTACT ROCK 2 1 Rock under Uniaxial Compression 2 2 Dynamic Elastic Constants 2 3 Hooke s Law determining the uniaxial compressive strength and deformability of rock materials Int J Rock

8 STRENGTH OF SOILS AND ROCKS
Figure 82 Uniaxial Compression Test on Rock with a Definitions of stress conditions and strains b Derived stressstrain 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

Uniaxial compressive strength c and deformation …
Unconfined Uniaxial Compression Test UCS The test determines the unconfined compressive strength of a rock specimen Drill core specimens with length to diameter ratio greater than 2 1 are cut with a diamond saw to achieve nearly …

Standard Test Method for Unconﬁned Compressive …
Uniaxial Compressive Strength UCS test To study the rock failure behaviour for example the rock spalling potential the relationship of the UCS and the ratio of the UCS and the tensile strength will give an estimation of the spalling potential

Uniaxial Compressive Strength  an overview
Jun 11 2017· This test shows how we tested a rock specimen to help determine the appropriate Rock Anchor for this rock type Testing rock specimen for Uniaxial Compressive Strength Compressive Strength

Triaxial and Uniaxial Tests Mining SGS
An understanding of rock strength is important for designing recovery plans for a reservoir and for developing an appropriate reservoir simulation A detailed discussion of rock failure can be found in Rock failure relationships and Compressive strength of rocks But the data needed for these methods may not be readily available so there is a desire to use data available from …

Uniaxial compressive strength versus Global strength
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

Compressive strength  Wikipedia
mitigating common errors during lab testingmitigating common errors during lab testing of intact rock Laboratory Testing of RocksLaboratory Testing of Rocks • Index testing of intact rock materials for Uniaxial Compressive Strength Ultrasonics Testing • Determine compression Pwave and

Mining Rock Mass Rating
indirect measure of the compressive or tensile strength of the rock D Andrea et al 4 performed uniaxial compression and the point load tests on a variety of rocks They found the following linear regression model to correlate the UCS and Is 50 qu = 16 3 15 3 Is 50 where qu = Uniaxial Compressive Strength of rock

Laboratory Testing of IntactLaboratory Testing of Intact Rocks
Mar 06 2015· This method of rock classification was introduced by Deer Miller in the year 1996 Two parameters are considered while classifying rocks on this method which are Uniaxial compressive strength Modulus of elasticity Step by Step Method to Classify Rock Based on Engineering Parameters This method of rock classification consists of 3 steps as given …

Prediction of The Uniaxial Compressive Strength of Rocks
Prediction of The Uniaxial Compressive Strength of Rocks Materials 10 4018 9781522527091 ch002 This study briefly will review determining UCS including direct and indirect methods including regression model soft computing techniques such as fuzzy