cohesive strength of basalt rock

STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1 ...

In general, rock mass strength depends on the strength of intact rock and the strength of rock discontinuities. In general, compared to intact rock, a rock mass has reduced tensile strength ... 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 26 214.1 ...

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Some Useful Numbers

Cohesive strength ( 0) Rock 10,000 kPa Silt 75 kPa Clay 10-20 kPa ... Field test for compressive strength of soils and rocks ... Tensile strength Granite 7-25 MPa Basalt 10-30 MPa Gneiss 5-20 MPa Quartzite 10-30 MPa Sandstone 4-25 MPa Shale 2-10 MPa Limestone 5-25 MPa

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8. STRENGTH OF SOILS AND ROCKS

The tensile strength of soil is very low or negligible and in most analyses it is considered to be zero. In contrast a number of direct or indirect tensile strength tests are commonly carried out for rock. In a direct tensile strength test a cylindrical rock specimen is stressed along its axis by means of a tensile force.

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Use of basalt in asphalt concrete mixes - ScienceDirect

Jan 01, 2009  The crushing strength and cohesive strength of cold basaltic rocks are 170–220 ... Due to the physical properties of the basalt rock, anti stripping agents have to be added to the basaltic-asphalt concrete mixes to enhance the mixes resistance to stripping. 4.

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Brittle strength of basaltic rock masses with applications ...

Jun 25, 1993  Values of tensile and cohesive strength for the basaltic rock mass are approximately one to two orders of magnitude lower than corresponding values for intact basalt. Temperatures comparable to those at the Venus surface may slightly increase the deformation modulus but decrease the compressive strength of the rock mass.

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Limits on strength and deformation properties of jointed ...

  A measured deformation modulus for ambient pressure in the vertical direction, 20 GPa, is 1.5–3 times larger than that in the horizontal directions, 13.5 and 6.5 GPa, reflecting strength anisotropy due to column or block geometry for one particular basalt. Values of tensile and cohesive strength for the basaltic rock mass are generally one to ...

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Mechanical Properties of Intact Rock and Fractures in ...

of the rock mineralogy (Giani, 1992). Estimation of JCS and JRC JCS can be set equal to uniaxial compressive strength when the state of weathering of intact rock material and the joint walls is similar. Otherwise, the Schmidt hammer (Giani , 1992) technique is appropriate. Barton and Choubey reported that JRC could be

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GSI: A GEOLOGICALLY FRIENDLY TOOL FOR ROCK

presented in Figure 4, gives a very close approximation of σcm for selected values of the intact rock strength σci, constant mi and the Geological Strength Index GSI : m GSI cm (0.0034mi ) ci{1.029 0.025e i} σ = 0.8 σ + (−0.1 ) (1) Geological Strength Index GSI 10 20 30 40 50 60 70 80 90 Cohesive strength / Uniaxial strength of intact ...

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Brittle strength of basaltic rock masses with applications ...

Jun 01, 1993  Values of tensile and cohesive strength for the basaltic rock mass are approximately one to two orders of magnitude lower than corresponding values for intact basalt. Temperatures comparable to those at the Venus surface may slightly increase the deformation modulus but decrease the compressive strength of the rock mass.

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Shear Strength Evaluation of Clay-Rock Mixtures

The influence of varying concentrations of rock particles on the shear strength of cohesive soil-rock mixtures was first investigated by Miller and Sowers (1957). These tests were carried out on consolidated, undrained triaxial specimens Of remolded river sand and sandy clay from a decomposed gneiss. Sand versus clay mixtures ranged from O to 100%.

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Use of basalt in asphalt concrete mixes - ScienceDirect

Jan 01, 2009  The crushing strength and cohesive strength of cold basaltic rocks are 170–220 ... Due to the physical properties of the basalt rock, anti stripping agents have to be added to the basaltic-asphalt concrete mixes to enhance the mixes resistance to stripping. 4.

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Design Manual Engineering Properties of Soil and Rock

Chapter 200—Geotechnical Design Section 200E-1—Engineering Properties of Soil and Rock Page 2 of 12 clays can gain strength with increases in effective stress. On the other hand, over-consolidated clays or weak rock may lose strength with time when exposed in cuts. The geotechnical engineer is responsible

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Strength and deformation properties of volcanic rocks in ...

Strength and deformation properties of volcanic rocks in Iceland ... Rock samples from the Tertiary Basalt For-mation were selected from boreholes OM1-4 under guidance of Hrein Haraldsson and ... the level of friction angle and cohesion for Tillite, Porphyritic Basalt

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Shear strength criteria for rock, rock joints, rockfill ...

Aug 01, 2013  Rock joints have had a valid non-linear strength criterion for 35 years, but tradition dies hard, and linear M-C extrapolations of test data, continue to deceive many into thinking that rock joints have cohesive strength. The reality is high friction, no cohesion and strong dilation at low stress. (4)

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Rock mass properties - Rocscience Inc.

uniaxial compressive strength ci of the intact rock pieces, value of the Hoek-Brown 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

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Practical Rock Engineering Chapter 4 Shear Strength of ...

cohesion, a soil mechanics term, which has been adopted by the rock mechanics community. In shear tests on soils, the stress levels are generally an order of magnitude lower than those involved in rock testing and the cohesive strength of a

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CLASSIFICATION // CHARACTERIZATION OF SOME ROCK

Intact rock strength . The uniaxial compressive strength of a rock material constitutes the highest strength limit of the rock mass of which it forms a part. It is determined in accordance with the standard laboratory procedures. For the purpose of rock mass classification, the use of the well -known point load strength index can be useful as the

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11 Rock mass properties

3. the value of the Geological Strength Index GSI for the rock mass. 11.3 Intact rock properties For the intact rock pieces that make up the rock mass equation 11.1 simplifies to: 0.5 ' ' 3 3 ' 1 1 + σ σ σ=σ+σ ci ci mi (11.4) The relationship between the principal stresses at failure for a given rock is defined by two constants, the ...

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GSI: A GEOLOGICALLY FRIENDLY TOOL FOR ROCK MASS

presented in Figure 4, gives a very close approximation of σcm for selected values of the intact rock strength σci, constant mi and the Geological Strength Index GSI : m GSI cm (0.0034mi ) ci{1.029 0.025e i} σ = 0.8 σ + (−0.1 ) (1) Geological Strength Index GSI 10 20 30 40 50 60 70 80 90 Cohesive strength / Uniaxial strength of intact ...

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ERDC Knowledge Core: Strength and deformation properties ...

Results of-nondestructive tests indication at the rock within each rock type was quite uniform. Results of the unconfined compressive strength tests on basalt indicated that as the loading rate was increased from 1 to 1.60 x 107 psi/sec, ultimate strength, total axial strain, and Young's modulus of elasticity increased.

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Practical estimates of rock mass strength

1. the uniaxial compressive strength s ci of the intact rock pieces in the rock mass, 2. the value of the Hoek-Brown constant m i for these intact rock pieces, and 3. the value of the Geological Strength Index GSI for the rock mass. THE EFFECT OF WATER Many rocks show a significant strength decrease with increasing moisture content.

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Brittle strength of basaltic rock masses with applications ...

Geophysical Research Letters; Global Biogeochemical Cycles; Journal of Advances in Modeling Earth Systems (JAMES)

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Cohesions, friction angles, and other physical properties ...

ally, cohesion from cementation, chemical bonding, electro-static attraction, and/or other sources commonly is present. Strength properties of soils can be described in a number of ways, but for the MER situation where our ability to sense strength properties of

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rock dowels, anchorage, cohesion intercept - Earth ...

Oct 29, 2002  In that paper there is a table of values for design. In the table the closest rock type to fractured basalt is just plain basalt with a working bond of 1.21-1.38 N/mm^2 and an ultimate bond of 3.86 N/mm^2. You might use a working bond of 1.2 N/mm^2 to determine the allowable capacity of a dowel grouted into the rock.

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Strength and deformation properties of granite, basalt ...

tests indicated that the rock within each rock type was quite uni­ form. Results of the unconfined compressive strength tests on basalt y indicated, that as the loading rate was increased from 1 to 1.60 x 10 psi/sec, ultimate strength, total axial strain, and Young's modulus of elasticity increased. Total diametral strain decreased as load­

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Strength and deformation properties of volcanic rocks in ...

Strength and deformation properties of volcanic rocks in Iceland ... Rock samples from the Tertiary Basalt For-mation were selected from boreholes OM1-4 under guidance of Hrein Haraldsson and ... the level of friction angle and cohesion for Tillite, Porphyritic Basalt

Read More
ERDC Knowledge Core: Strength and deformation properties ...

Results of-nondestructive tests indication at the rock within each rock type was quite uniform. Results of the unconfined compressive strength tests on basalt indicated that as the loading rate was increased from 1 to 1.60 x 107 psi/sec, ultimate strength, total axial strain, and Young's modulus of elasticity increased.

Read More
Design Manual Engineering Properties of Soil and Rock

Chapter 200—Geotechnical Design Section 200E-1—Engineering Properties of Soil and Rock Page 2 of 12 clays can gain strength with increases in effective stress. On the other hand, over-consolidated clays or weak rock may lose strength with time when exposed in cuts. The geotechnical engineer is responsible

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Estimating uniaxial compressive strength of rocks using ...

Aug 01, 2013  Porosity is a significant physical feature of rocks due to water absorption that causes decrease in the strength. The basalt of the study area can be described as “highly porous” and ignimbrite as “extremely porous” according to the classification by Anon (1979).The average UCS of basalt is determined as 26.65 MPa.For the ignimbrite, the lowest UCS is

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Estimating Hoek-Brown Rock Mass Strength Parameters from ...

to the cohesive strength (c') of the Mohr-Coulomb criterion and goes on to discuss its bounds. Intact rock specimens with finite tensile strength have a maximum value of s equal to 1. Heavily jointed or broken rock in which the tensile strength, cohesive strength, and effective normal stress are zero is char­ acterized by a minimums-value of zero.

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CLASSIFICATION // CHARACTERIZATION OF SOME ROCK

Intact rock strength . The uniaxial compressive strength of a rock material constitutes the highest strength limit of the rock mass of which it forms a part. It is determined in accordance with the standard laboratory procedures. For the purpose of rock mass classification, the use of the well -known point load strength index can be useful as the

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(PDF) Determination of c and Φ of rocks from indirect ...

The tensile strength models were shown to be different in their definition of suction stress and the presence or absence of a cohesion term. As tensile strength data of fine-grained soils with the ...

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11 Rock mass properties

3. the value of the Geological Strength Index GSI for the rock mass. 11.3 Intact rock properties For the intact rock pieces that make up the rock mass equation 11.1 simplifies to: 0.5 ' ' 3 3 ' 1 1 + σ σ σ=σ+σ ci ci mi (11.4) The relationship between the principal stresses at failure for a given rock is defined by two constants, the ...

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rock dowels, anchorage, cohesion intercept - Earth ...

Oct 29, 2002  In that paper there is a table of values for design. In the table the closest rock type to fractured basalt is just plain basalt with a working bond of 1.21-1.38 N/mm^2 and an ultimate bond of 3.86 N/mm^2. You might use a working bond of 1.2 N/mm^2 to determine the allowable capacity of a dowel grouted into the rock.

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Lectures on Rock MechanicsLectures on Rock Mechanics

Rock Mechanics ProblemsRock Mechanics Problems • How will rock react when put to men’s use? • What is the bearing capacity of rock on surface an at depths? • What is the shear strength of rocks?What is the shear strength of rocks? • What is the response of rocks under dynamic / earthquake type loading?

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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.

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Empirical relations between rock strength and physical ...

Empirical relations between rock strength and physical properties in sedimentary rocks Chandong Chang a,⁎, Mark D. Zoback a,1, Abbas Khaksar b,2 a Department of Geophysics, Stanford University, Palo Alto, CA 94305-2215, USA b GeoMechanics International, Inc., Perth, WA 6000, Australia Received 1 April 2005; received in revised form 27 November 2005;

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FRICTION ANGLE OF SOIL AND ROCK

FRICTION ANGLE OF SOIL AND ROCK . Dragan Lukić. 1 UDK: 624.131 DOI: 10.14415/konferencijaGFS2018.03. 4. Summary: By examining the soil and the rock mass is one of the main parameters to be determined is the angle of internal friction. Soil friction angle is a shear strength parameter of soils.

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