Laboratory Testing and Interpretation of Rock Properties · PDF Datei

    part for the design of rock fills, cut slopes, shallow and deep foundations, tunnels, and the assessment of shore protection materials (rip-rap). Deformation and strength properties of intact specimens aid in evaluating the larger-scale rock mass that is significantly controlled by joints, fissures, and discontinuity features (spacing, roughness, orientation, infilling), water pressures, and ...

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    An empirical method for design of grouted bolts in rock ... · PDF Datei

    Technical Note An empirical method for design of grouted bolts in rock tunnels based on the Geological Strength Index (GSI) Reza R. Osgouia,⁎, Erdal Ünalb a GEODATA SpA., Corso Duca degli Abruzzi, 48/E, 10129, Turin, Italy b Mining Engineering Department, Middle East Technical University, 06531/Ankara, Turkey article info abstract Article history:

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    Estimating Rock Mass Strength - BM 1997 02 · PDF-bestand

    The strength of jointed rock masses is notoriously difficult to assess. Laboratory tests on core samples are not representative of a rock mass of significantly larger volume. On the other hand, in situ strength testing of the rock mass is seldom practically or economically feasible.

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    DESIGN OF ANCHOR BOLTS EMBEDDED IN CONCRETE .

    The design provisions for anchor bolts using the strength design method is nearly identical to that used for allowable stress design, with appropriate revisions to convert the requirements to produce nominal axial tension and shear design strengths. The strength reduction factors, Φ, for use in Equations 11 through 18 are taken equal to the ...

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    About Slick Rock {Local Design - National .

    Slick Rock is a design and manufacturing company devoted to producing the best in decorative concrete landscape elements. Experienced local artisans design and manufacture contemporary concrete planters, fire bowls, Perimeter Security Devices, PSD benches, and unique concrete landscape elements for residential homes and commercial projects. Home / Why Choose Slick Rock. About Us Slick Rock ...

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    (PDF) Experience with empirical rock slope design

    Strength equilibrium slopes are rock slopes whose gradient θ and rock mass strength (RMS) are in adjustment. The identification of such slopes depends on the accurate specification of the ...

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    Rock Engineering Practice & Design · Plik PDF

    and slightly rough The strength of 4 6 8 10 12 R and slightly rough. The strength of MR Rating R the intact rock is estimated to be 55 MPa with an RQD of 60% and a mean fracture spacing of 0.4 m. The fractures are observed to be damp 0 2 0 50 100 150 200 250 300 Unconfined Compressive Strength, q .

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    Rock Slope Engineering · PDF Datei

    1.4 Rock slope design methods 8 1.4.1 Summary of design methods 8 1.4.2 Limit equilibrium analysis (deterministic) 11 1.4.3 Sensitivity analysis 14 1.4.4 Probabilistic design methods 15 1.4.5 Load and Resistance Factor Design 20 2 Structural geology and data interpretation 22 2.1 Objectives of geological investigations 22 2.2 Mechanism of joint formation 24 2.3 Effects of discontinuities on ...

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    Rock mass properties - Rocscience Inc. · PDF-bestand

    Rock mass properties Introduction Reliable estimates of the strength and deformation characteristics of rock masses are required for almost any form of analysis used for the design of slopes, foundations and

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    Chapter 5 Engineering Properties of Soil and Rock · PDF-bestand

    can gain strength with increases in effective stress, and overconsolidated clays may lose strength with time when exposed in cuts, unloaded, or exposed to water. Some construction materials such as weak rock may lose strength due to weathering within the design life of the embankment. These long-term effects shall be considered when

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    Rock mass strength at depth and implications .

    It is illustrated that current empirical design rules may be flawed and further studies are required to arrive at more economic designs for pillars at depth, or under high stress, and in brittle failing rock masses. When confined in the core of pillars, the rock mass may exhibit superior strength than typically assumed by Mohr–Coulomb or Hoek–Brown failure criteria as it will fail ...

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    8. STRENGTH OF SOILS AND ROCKS · PDF-bestand

    Rock strength has been found to be size dependent because of the cracks and fissures that are often present in the material. This is illustrated from the results of tests on three rock types in Fig. 8.2. The size dependancy is also found to exist for stiff fissured

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    The effect of water content on the strength of .Przetłumacz tę stronę

    23.12.2012 · The mainly strength of cement or mortar come from rock that means the failure of building leads directly to the failure of rock as well which depends on the strength of rock. The strength of rock which usually means in compression is the capacity of rock to resist failure. The strength is generally decreased when the pore spaces of intact rock ...

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    Determining Rock Mass Bearing Capacity and Strength ...

    A final foundation design is controlled by considerations such as settlement, stability from sliding and overturning rather than by bearing capacity. However it is still makes sense for a designer to evaluate the rock mass strength bearing capacity to ensure that the designed loads in no way exceed the capacity of the rock to carry the required load.

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    Drilling mechanics and performance · PDF Datei

    will form a straight line, regardless of rock strength, bit cut-ters and design, or RPM. The straight line is referred to as a proportionate response, a term that will be used throughout this chapter. Figures DP-2b and -2c show the effects of rock strength and bit aggressiveness. As rock strength increases, more WOB will be required to achieve a given indentation depth (depth of cut). The ...

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    Drilling mechanics and performance

    E˚ect of rock strength and WOB E˚ect of bit aggressiveness and WOB Figures DP-2a, -2b, and -2c (at right, from top): If the bit is efficient, a plot of ROP vs WOB will form a straight line, regardless of rock strength, bit cutters and design, or RPM. Figure DP-2a: Effect of WOB and RPM. Figure DP-2b: Effect of rock strength. Figure DP-2c ...

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    Q-system (geotechnical engineering) - WikipediaPrzetłumacz tę stronę

    For the linguistics formalism, see Q-systems. For the genetic method, see Q-system (genetics).. The Q-system for rock mass classification is developed by Barton, Lien, and Lunde. It expresses the quality of the rock mass in the so-called Q-value, on which are based design and support recommendations for underground excavations.. The Q-value is determined with

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    NORMAN I. NoIuIsH ROCK STRENGTH PROPERTIES AMD THEIR ... · PDF-bestand

    strength of the rock mass is particularly important in determining design strength values for stability analysis. Rock mass is the term used to describe the material along the rupture surface. The rock mass may consist of a continuous fracture, a combina-tion of intact rock and fractures, or solely intact rock.

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    CHAPTER 6

    Normally consolidated clays can gain strength with increases in effective stress and overconsolidated clays may lose strength with time when exposed in cuts. Some construction materials, such as weak rock, may loose strength due to weathering within the design life of the embankment.

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    Unconfined Compressive Strength Test of Rock

    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 seat ...

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    Geotechnical Engineering Standards - ASTM .Przetłumacz tę stronę

    Standard Practices for Preparing Rock Core as Cylindrical Test Specimens and Verifying Conformance to Dimensional and Shape Tolerances: D4553 - 18: Standard Test Method for Determining In Situ Creep Characteristics of Rock: D4554 - 12: Standard Test Method for In Situ Determination of Direct Shear Strength of Rock Discontinuities: D4611 - 16

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