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Ucs of rock

  • UCS and Bearing Capacities of Rock - Geotechnical

    Nov 05, 2010· RE: UCS and Bearing Capacities of Rock BigH (Geotechnical) 4 Nov 10 05:42 If you have access to MJ Tomlinsons Foundation Design and Construction (edition that started putting in the Eurocode), it has a good section on foundations on rock - he's a practicing engineer - not a professorial type of text writer.

  • (PDF) Interpretation of Ucs Test Results for Engineering

    This article focuses on the uniaxial compressive strength (UCS) of homogeneous and heterogeneous rocks. Critical factors impacting the UCS of rocks are reviewed and then separate assessments of UCS data from homogeneous and heterogeneous rocks are

  • Evaluation of the ratio between uniaxial compressive

    The ratio of UCS/SRH defined as a function of the UCS is a much better indicator for assessing the mechanical characteristics of rocks because the UCS of rocks defines the strength of the material and the ratio UCS/SRH is strongly affected by the level of the UCS.

  • UNCONFINED COMPRESSIVE STRENGTH OF ROCK

    Project No. 611145 Operated By: CH Project Name: SRK Checked By: AP Depth: 261.39 - 261.64m Test No. T16 Date: 14-Sep-12 Sample ID. 12GSE 175B_UCS_006 Initial Length (mm) = 92.10 Initial Diameter (mm) = 44.77 Average Cross-sectional Area (mm2) = 1574 Volume of the specimen (mm3) = 145001 Total mass of the specimen (g) = 387.5

  • Suggested Methods for Determining the Uniaxial Compressive

    Rock Materials PART 1. SUGGESTED METHOD 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

  • Guidelines on Rock Identification-1

    3.7.1 Establish correlation between UCS and Is(50)of rocks at site Table 4 presents the uniaxial compressive strength (UCS) of rock based on BS EN ISO 14689. Combining the indicators in Tables 2, 3 and 4, rocks with weathering Grade III or better shall have a strength grade of moderately strong with UCS of at least 12.5MPa.

  • ROCK STRENGTH, ROCK BRITTLENESS AND BLAST

    hard rock specimens blow apart when the UCS is reached - This is due to the energy stored in the testing machine and in the rock specimen itself - Standard or commonly used testing machines are soft, ie they can store a lot of energy 9. 10 - The full stress-strain behaviour of brittle rock

  • (PDF) Correlation between uniaxial strength and point load

    Compressive Strength (UCS) is one of the most important properties of rocks. Point Load Test (PL T) is practically used in geotechnical engineer ing to determine rock strength index. Despite that

  • 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.

  • HOW TO CLASSIFY ROCKS? (ENGINEERING CLASSIFICATION OF

    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 []

  • Correlation between the point load index (Is(50)) and the

    important engineering parameters in rock mechanics; it is used to characterize and study the behavior of solid rocks. A good correlation between the unconfined compression strength test (UCS) and the point load strength (PLS) can be very useful because it allows for faster and cheaper testing than others with the same security to calculate the

  • An Empirical UCS Model for Anisotropic Blocky Rock Masses

    In this research, UDEC rock mass models, which are calibrated by laboratory data, are used to investigate the effects of joint orientation on rock mass strength in an unconfined state. The values of UCS obtained from the numerical simulation are then compared with those calculated from traditional empirical UCS models based on the GSI system.

  • Rock UCS with Young's Modulus and Poissons Ratio

    Rock UCS with Young's Modulus and Poissons Ratio LibraTech (Geotechnical) (OP) 12 Jun 13 02:31. Good Day All, I have some test results on Mudstone materials (Generally 3-10MPa UCS) where the Secant and Tangent E-value aswell as the Secant and Tangent Poissons Ratios were determined with the specific failure load and associated UCS of the rock

  • Home - Utica Community Schools

    UCS Vision All children have the right to a rigorous, high-quality education which meets their individual needs. UCS will respect, encourage and empower each and every student to acquire the necessary knowledge, skills and attitudes to be successful, contributing members

  • Rock mass properties - Rocscience Inc.

    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 ci ci m i (5) The relationship between the principal stresses at failure for a given rock is defined by

  • Correlation between Uniaxial Compressive Strength and

    Rock engineers widely use the uniaxial compressive strength (UCS) of rocks in designing surface and underground structures. The procedure for measuring this rock strength has been standardized by both the International Society for Rock Mechanics [1] and American Society for Testing and Materials [2]. The method is time consuming and expensive.

  • Uniaxial Compressive Strength - an overview

    Uniaxial compressive strength (UCS) is one of the most important mechanical properties of rocks widely used in different engineering related projects to evaluate the stability of structures against loads.

  • A STUDY ON MODES OF ROCK FAILURE UNDER UNIAXIAL

    increments with the increment in binding weight, UCS gives a measure of least quality a rock specimen can have under packing and, thusly, the disappointment modes of rock materials under uniaxial squeezing can give valuable data to sheltered and financial outline of different designing structures.

  • Uniaxial Compressive Strength (UCS) test

    By comparing the UCS of the rock to rock stresses result in an estimation of the rock mass strength and the factor of safety (FOS) against rock mass failure. We can provide turn key solutions for determining the rock mass strength, in situ stresses and provide you high quality stability analysis.

  • Measuring Rock Strength Soil Surveys

    Generally, the UCS (Unconfined Compressive Strength) is the most common type of assessment. Direct measurement is undertaken in a similar way to concrete cylinders i.e. a core of rock must be taken of the rock mass you are assessing. This requires a medium to large sized drilling rig capable of wash boring with coring ability.

  • Unconfined Compressive Strength Test of Rock

    Mar 17, 2017· 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

  • Predicting the compressive and tensile strength of rocks

    Rock engineers have commonly used the uniaxial compressive strength (UCS) and Brazilian tensile strength (BTS) of rock for designing surface and underground structures. Determining these rock strengths is time-consuming and expensive, particularly for the preliminary studies of projects. For this reason, indirect tests such as Schmidt rebound

  • Predicting Uniaxial Compression Strength (UCS) Using Bulk

    May 12, 2015· In engineering practice particularly in measuring strength properties of rock, uniaxial compressive strength (UCS) is considered as one of the key in characterizing rock material. However, sometime it is quite difficult or impossible to full fill the test requirement especially when dealing with rock that consists of discontinuities or fractures.

  • Correlation between the point load index (Is(50)) and the

    important engineering parameters in rock mechanics; it is used to characterize and study the behavior of solid rocks. A good correlation between the unconfined compression strength test (UCS) and the point load strength (PLS) can be very useful because it allows for faster and cheaper testing than others with the same security to calculate the

  • THE UNIAXIAL COMPRESSIVE STRENGTH OF SOFT ROCK

    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, such as size, saturation, weathering and mineral content. A number of uniaxial compression tests have been conducted onto soft rock samples.

  • CORRELATION BETWEEN UNCONFINED COMPRESSIVE

    Fig -8: Predicted UCS vs Actual UCS for Jointed Rock Group A Fig -9: Predicted UCS vs Actual UCS for Jointed Rock Group B From Figure 8 & 9 the closeness of predicted values to that of observed values could be seen clearly. It is noticed that except for the joint filled with clay and oriented at 30° , the deviation is minimum. 6.

  • Determination of uniaxial compressive strength of

    Nov 01, 2013· The uniaxial compressive strength (UCS) of intact rock is an important mechanical parameter which is required for many engineering projects. In some engineering projects such as well drilling for petroleum production, due to the depth of the well, there are some limitations for obtaining rock core samples and determining the UCS.

  • Determination of uniaxial compressive strength of

    Nov 01, 2013· The uniaxial compressive strength (UCS) of intact rock is an important mechanical parameter which is required for many engineering projects. In some engineering projects such as well drilling for petroleum production, due to the depth of the well, there are some limitations for obtaining rock core samples and determining the UCS.

  • Ucs of rock - okdgroup

    Ucs of rock Products As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any size-reduction requirements including, Ucs of rock, quarry, aggregate, and different kinds of minerals.

  • Compressive strength of rocks - PetroWiki

    Jun 04, 2015· 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

  • 8. STRENGTH OF SOILS AND ROCKS

    It has been found that a rock core will split along a diameter when loaded on its side in a compression machine. This is the basis of the Brazilian test which is an indirect method of measuring tensile strength. A rock specimen having a disc shape with diameter (d) and thickness (t)

  • Estimate of Uniaxial Compressive Strength of

    The strength of rocks is generally evaluated based on uniaxial compressive strength (UCS). However, rock core pieces for UCS tests cannot always be obtained from outcrops of faulted, jointed, or heavily crushed rock masses.

  • Correlation of Sonic Travel Time to the Uniaxial

    for a broad range of coal measure rock types. For the entire data set, the relationship between UCS and sonic travel time is expressed by the following equation, where UCS is in psi and t is the travel time of the P-wave in microsec/ft. UCS = 468,000 x e-0.054t (1) The r

  • The Hoek-Brown failure criterion and GSI - 2018 edition

    Rock mass strength Uniaxial compressive strength (UCS) Tension cut-off Rock mass deformation modulus abstract The HoekeBrown criterion was introduced in 1980 to provide input for the design of underground ex-cavations in rock. The criterion now incorporates both intact rock

  • Rock Strength (Shear strength, compressive strength

    1-F Rock Strength What is Strength? It turns out that the strength of a geomaterial is a highly complex subject There still remain issues on which experts are not in full agreement (e.g. scale dependency of tensile strength, creep failure ) Strength can be a simple measure, such as unconfined compressive strength (UCS)

  • Point Load Test Geoengineer

    The PL tests are a rock classification index but they can also be used to estimate the UCS of the tested rock. There have been many studies on the correlation between I S50 and UCS and research has shown that there is no valid relation that could predict with high accuracy the actual UCS of a material based on I

  • Estimating the Intact Rock Strength of a Rock Mass by

    Intact rock strength (IRS) is a major rock property. Intact rock strength determines the strength of the intact rock block material and as such governs partially the strength of a rock mass. Standard determination of the IRS is by means of a unconfined compressive strength (UCS) test. In, for example, most rock

  • Estimation of Unconfined Uniaxial Compressive Strength

    and UCS and Youngs modulus for andesites, basalts and tuffs. The researchers [13] determined an empirical equation betwe en RN and UCS for igneous, metamorphose and sedimentary rock specimens.The authors [14] conducted Schmidt hardness test to estimate the mechanical properties of rocks, particularly the unconfined

  • Excavatability Assessment of Rock Masses for Geotechnical

    A number of different methods have been proposed to evaluate the excavatability of rocks based on their geotechnical properties, such as rock mass rating (RMR), uniaxial compressive strength (UCS), discontinuity spacing of rock masses, point load index (PLI) and seismic velocity of intact rock.

  • Rock UCS Using Equotip 550 - PCTE

    Rock strength can be measured using a variety of method. Generally, the UCS (Unconfined Compressive Strength) is the most common form of assessment. Direct measurement is undertaken similarly to concrete cylinders i.e. a core of rock must be extracted from the rock mass you wish to assess.