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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.

STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1

TESTING OF INTACT ROCK FOR STRENGTH 2.1 Uniaxial Compression Recall the typical stress strain response curve for a specimen of intact rock under uniaxial compression (see Figure 1 in Lecture Notes 5). Granite Basalt Gneiss Schist Quart-zite Marble Lime-stone Sand-stone Shale Av. Co Max. Co Min. Co Range No. of samples 181.7 324.0 48.8 275.2

Bearing Capacity of Rocks

In case of rock mass with favorable discontinuities, the net allowable bearing pressure may be estimated from: q a = q c * N j Where qWhere q c = average uniaxial compressive strength of rock coresaverage uniaxial compressive strength of rock cores N j = empirical coefficient depending on the spacing of the discontinuities 3+S/B 10 1+300(δ/S) δ= thickness of discontinuity= thickness of

Rock testing SlideShare

Jun 28, 2018 Some typical values of compressive strength of some rocks Ms.Anjana R Menon,Asst.Prof., Dept of Civil Engg 42. 3.Ring Shear Test • Gives the shear strength of rock as a function of confining pressure. • In this test the specimen doesn‟t require perfect square or smooth ends. • Load is applied parallel to the axis of core.

Granite SlideShare

Feb 05, 2011 Orbicular granite near the town of Caldera,northern Chile Roche Rock, Cornwall The Stawamus Chief is a granite monolith in British Columbia Occurrence 12. Occurrence The Cheesewring,a granite tor on the southern edge of Bodmin Moor,Cornwall Close-up of granite

8. STRENGTH OF SOILS AND ROCKS

STRENGTH OF SOILS AND ROCKS 8.1 COMPRESSIVE STRENGTH The strength of a material may be broadly defined as the ability of the material to resist imposed forces. If is often measured as the maximum stress the material can sustain under Stone Mt. granite 55.1 51.0 0 69 Indiana limestone 6.7 42.0 0 10 . 8-10 8.4 THEORY OF STRENGTH

Properties of Granite Physical Thermal Compare Rocks

Rocks are rated on the on the Moh's Hardness Scale which rates the rocks on the scale from 1 to 10. Rocks with hardness 1-3 are soft rocks from 3-6 are medium hardness rocks and 6-10 are hard rocks. The hardness of Granite is 6-7 whereas its compressive strength is 175.00 N/mm 2. Streak is the color of rock when it is crushed or powdered. The

Rock Mechanics

• Strength classification is based on strength of the rock (compressive strength & modulus of elasticity; Table 7.2) • 5 strength classes: A-E based on the overall rock strength; A = very strong, E = very weak (Table 7.3) • Any discontinuities, fractures, bedding planes, etc. will strongly influence overall strength of the rock.

(PDF) PROPERTIES OF BUILDING STONES

The compressive strength of basalt varies from 200 to . 350 N/mm2. They are used as road metals, aggregates for concrete. They are also used for Granite: Granites are intrusive igneous rocks.

(PDF) Shear Strength Parameters of Granite Rock Mass: A

The shear strength of geological materials, like soils and rocks, is often represented either by Coulomb or Mohr–Coulomb theory. It is assumed to vary linearly with the applied stress through

Granite cutting dust SlideShare

Mar 26, 2017 INTRODUCTION • Granite Powder is an byproduct produced in granite factories while cutting into desired shapes • Granite belongs to igneous rock family which is having compressive strength more than 200 Mpa • Granite industry produces around 18 million tons waste per annum • The physical properties of GCD is more similar to the natural

lecture 1_Engineering Properties of Rocks.ppt FCE 211

Engineering Uses of Rocks Rock is used for engineering purposes in 2 primary ways: 1. as a building material: items such as cut stones, beams, support columns, decorative panels, etc. Each student can envision examples where rock has been used in one of these ways. 2. as a foundation: For example, on Manhatan Island, the skyscapers are founded on granite.

ROCK STRENGTH, ROCK BRITTLENESS AND BLAST

An introduction to compressive strength testing of rock 6. 7. Equipment for Uniaxial Tests (with deformation measurement) 8 In common rock strength testing, most Granite Dolerite Absolute brittleness ductility Sandstone Energy stored in the rock specimen depends

8. STRENGTH OF SOILS AND ROCKS

STRENGTH OF SOILS AND ROCKS 8.1 COMPRESSIVE STRENGTH The strength of a material may be broadly defined as the ability of the material to resist imposed forces. If is often measured as the maximum stress the material can sustain under Stone Mt. granite 55.1 51.0 0 69 Indiana limestone 6.7 42.0 0 10 . 8-10 8.4 THEORY OF STRENGTH

Rock strength properties of granitic rocks in Yosemite

Yosemite National Park, located in the central part of California’s Sierra Nevada mountains, is a glacially carved landscape filled with iconic rock formations such as Cathedral Peak, El Capitan, and Half Dome. Igneous rocks, consisting primarily of variations of granite, granodiorite, and tonalite, make up the majority of the bedrock geology and their overall strength supports the

Granite Assignment Point

The average density of granite is between 2.65 and 2.75 g/cm3 (165.4 171.7 lb/ft3), its compressive strength usually lies above 200 MPa, and its viscosity near STP is 3–6 • 1019 Pa·s. Properties and Occurrence of Granite. Granite properties are essential when it comes to identification of rocks.

Soil Classification

Soil Types- Stable Rock. Stable Rock. To determine the unconfined compressive strength of the soil with a shearvane, the blades of the vane are pressed into a level section of undisturbed soil, and the torsional knob is slowly turned until soil failure occurs. The information above was taken from the new 2 hour Intro to OSHA PPT, slide #10.

(PDF) Shear Strength Parameters of Granite Rock Mass: A

The shear strength of geological materials, like soils and rocks, is often represented either by Coulomb or Mohr–Coulomb theory. It is assumed to vary linearly with the applied stress through

Compressive Strength Of Granite Rock

Compressive Strength Of Granite Rock. Strength characteristics of rock and rock mass 1 Introduction to strength characteristics of rock and rock mass 2 strength test of intact rock between strain hardening and softening is called unconfined compressive strength of rock, expressed as continuous Co or Qu failure from C to D, during which granite basalt.

Determination and applications of rock quality designation

Jun 01, 2016 Kulhawy and Goodman (1987) suggested that, as a first approximation, the unconfined compressive strength σ cm of rock masses be taken as 0.33σ c when RQD is less than about 70% and then linearly increase to 0.8σ c when RQD increases from 70% to 100% (see Fig. 8), where σ c is the unconfined compressive strength of the intact rock.

Estimating Rock Mass Strength BM 1997 02

σc = uniaxial compressive strength of the intact rock material, σ1 = major principal stress at failure, and σ3 = minor principal stress at failure. The uniaxial compressive strength for the rock mass, σc, rockmass,can be expressed by setting σ3 = 0 in Equation 2.1 thus obtaining σc, rockmass =σc s . (2.2)

Analytical simulation of the dynamic compressive strength

Analytical simulation of the dynamic compressive strength of a granite using the sliding crack model H. B. Li Institute of Rock and Soil Mechanics, The Chinese Academy of Sciences, Wuhan 430071, China

Composition and Physical Properties Of Granitic Rocks from

The strength values are comparable to determinations of uniaxial compressive strength tests of Westerly granite, which range from 130 MPa to 210 MPa (Heard and others, 1974). The slopes of best-fitting lines to the elastic portions of the stress-strain data from the strength experiments were taken for the values of Young's modulus.

Physical Types of Rocks Kinds of Rocks Famous Rocks

Rocks are rated on the on the Moh's Hardness Scale which rates the rocks on the scale from 1 to 10. Rocks with hardness 1-3 are soft rocks from 3-6 are medium hardness rocks and 6-10 are hard rocks. The hardness of Diabase is 7 whereas its compressive strength is 225.00 N/mm 2. Streak is the color of rock when it is crushed or powdered.

Granite cutting dust SlideShare

Mar 26, 2017 INTRODUCTION • Granite Powder is an byproduct produced in granite factories while cutting into desired shapes • Granite belongs to igneous rock family which is having compressive strength more than 200 Mpa • Granite industry produces around 18 million tons waste per annum • The physical properties of GCD is more similar to the natural

8. STRENGTH OF SOILS AND ROCKS

STRENGTH OF SOILS AND ROCKS 8.1 COMPRESSIVE STRENGTH The strength of a material may be broadly defined as the ability of the material to resist imposed forces. If is often measured as the maximum stress the material can sustain under Stone Mt. granite 55.1 51.0 0 69 Indiana limestone 6.7 42.0 0 10 . 8-10 8.4 THEORY OF STRENGTH

lecture 1_Engineering Properties of Rocks.ppt FCE 211

Engineering Uses of Rocks Rock is used for engineering purposes in 2 primary ways: 1. as a building material: items such as cut stones, beams, support columns, decorative panels, etc. Each student can envision examples where rock has been used in one of these ways. 2. as a foundation: For example, on Manhatan Island, the skyscapers are founded on granite.

Granite Assignment Point

The average density of granite is between 2.65 and 2.75 g/cm3 (165.4 171.7 lb/ft3), its compressive strength usually lies above 200 MPa, and its viscosity near STP is 3–6 • 1019 Pa·s. Properties and Occurrence of Granite. Granite properties are essential when it comes to identification of rocks.

Soil Classification

Soil Types- Stable Rock. Stable Rock. To determine the unconfined compressive strength of the soil with a shearvane, the blades of the vane are pressed into a level section of undisturbed soil, and the torsional knob is slowly turned until soil failure occurs. The information above was taken from the new 2 hour Intro to OSHA PPT, slide #10.

Estimating Rock Mass Strength BM 1997 02

σc = uniaxial compressive strength of the intact rock material, σ1 = major principal stress at failure, and σ3 = minor principal stress at failure. The uniaxial compressive strength for the rock mass, σc, rockmass,can be expressed by setting σ3 = 0 in Equation 2.1 thus obtaining σc, rockmass =σc s . (2.2)

Rock mass properties Rocscience Inc.

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 two constants, the uniaxial compressive strength and a

Compressive Strength Of Granite Rock

Compressive Strength Of Granite Rock. Strength characteristics of rock and rock mass 1 Introduction to strength characteristics of rock and rock mass 2 strength test of intact rock between strain hardening and softening is called unconfined compressive strength of rock, expressed as continuous Co or Qu failure from C to D, during which granite basalt.

Quantification of microcrack characteristics and

Dec 01, 2017 Garibaldi Grey Granite from British Columbia, Canada, was chosen for this study due its homogeneity and small crystal size (between 0.5 and 1 mm) with regards to the dimensions of a thin section and a laboratory sample.The composition of the granite, estimated from an optical micrograph of the unheated granite (a cropped micrograph is shown in Fig. 1a) is 45% quartz, 45% feldspar, and

Compressive strength of rock core YouTube

Oct 31, 2017 How to calculate compression strength of rock. MinE 323- Uniaxial Compressive Strength Test (Lab 4) Duration: 6:06. Civil and Environmental Engineering, School of Mining and Petroleum

Uniaxial compressive strength ( c) and deformation modulus

Uniaxial compressive strength ( c) and deformation modulus of rocks Average values from tests of intact rock samples Tests of rocks world-wide Scandinavian rocks tested at Granite 154 48 313 71 169 42 250 20 Granodiorite 160 51 319 2 171 20 118 2 Gabbro 228 106 466 5 248 76 306 1

UNIAXIAL COMPRESSIVE STRENGTH OF MALAYSIAN

the uniaxial compressive strength will be analyzed. METHODOLOGY This study is primarily a laboratory experimental works on tropically weathered granite rocks. More than 30 specimens were required for this research purpose. The rock samples used in this study were collected from Bukit Rahman Putra Sungai Buloh. The granite rocks samples

Granite Rocks : What Is Granite Rock And How Is It Formed

The average granite density ranges from 2.65 to 2.75 g / cm3 (165 to 172 lb / cu ft), its compressive strength is usually above 200 MPa, and its viscosity near STP is 3–6·1019 Pa·s. How is granite formed? Granite is more common in continental crust than in oceanic crust and has a felsic composition.

Compression and Tension Strength of some common Materials

Common materials and average ultimate compression and tension strength Engineering ToolBox Resources, Tools and Basic Information for Engineering and Design of Technical Applications! search is the most efficient way to navigate the Engineering ToolBox!