intack rock strength for kimberlite

Properties of Kimberlite | Physical | Thermal

strength, stiffness, and durability. • Select reppp gresentative specimens for testing • Recognize importance of QA/QC for mitigating common errors during lab testingmitigating common errors during lab testing of intact rock. Title: Microsoft PowerPoint - Presentation-6 [Compatibility Mode]

Standard Test Method for Unconfined Compressive Strength …

The rock mechanics of kimberlite volcanic pipe excavation ... difference between intact rock strength and rock mass strength. The strength of an intact rock sample without fractures as measured in a laboratory is greater than a rock sample that contains discontinuities. Discontinuities are …

ISRM

classes, intact strength, magnetic and weathering susceptibility, and three-dimensional position within the bodies. The primary infield classification was done according to major rock type (- gneiss or kimberlite), added to which the textural components within these rocks further subdivided them into -

Geotechnical Modelling for Kimberlite Pipes

Aug 08, 2017· The research described in this paper provides information about the rockbursting potential of kimberlite. Kimberlite is a diamond-bearing rock found in deposits around the world including northern Canada. This paper outlines three methods for the prediction of rockbursts based on the properties of a rock. The methods include the: strain energy index, strain energy density, and rock …

Mechanical Properties of Intact Rock and Fractures in ...

The uniaxial compressive strength of the rock mass σcm is a particularly useful parameter for evaluating potential tunnel squeezing problems. The following equation, obtained by a curve fitting process on the plots presented in Figure 4, gives a very close approximation of σcm for selected values of the intact rock strength

Strength Characteristics for Limestone and Dolomite Rock ...

intact rock, hence Hoek–Brown strength envelopes for each phase 6/7 kimberlite type. This was deemed appropriate because, in common with the vast majority of …

Rockbursting Potential of Kimberlite: A Case Study of ...

3 surface as a function of the normal stress is required. Procedures to deal with this obstacle will be discussed in Chapter 3 of this report. For intact rock, s = 1 and m = mi.Values for mi can be calculated from laboratory triaxial testing of core samples at different confining stress, or …

Estimating Rock Mass Strength - BM 1997 02

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

Comparison of six major intact rock failure criteria using ...

Kimberlite is an igneous rock, which sometimes contains diamonds.It is named after the town of Kimberley in South Africa, where the discovery of an 83.5-carat (16.70 g) diamond called the Star of South Africa in 1869 spawned a diamond rush and the digging of the open-pit mine called the Big Hole.Previously, the term kimberlite has been applied to olivine lamproites as Kimberlite II, however ...

Estimating Rock Mass Strength - BM 1997 02

SM for Determining Shear Strength - 1974 [EUR 4] SM for Determining Tensile Strength of Rock Materials - 1978 [EUR 4] SM for Laboratory Testing of Argillaceous Swelling Rock - 1989 [EUR 4] SM for Laboratory Testing of Swelling Rocks - 1999 [EUR 4] SM for the Complete Stress-Strain Curve for Intact Rock in Uniaxial Compression - 1999 [EUR 4]

The_Rock_Mechanics_of_Kimberlite_volcanic_pipe_excavation ...

Jun 01, 2016· Suitability of six major intact rock failure criteria: Mohr–Coulomb, Hoek–Brown, Modified Lade, Modified Wiebols and Cook, Mogi and Drucker–Prager in representing the intact rock strength under the true-triaxial stress condition (σ 1 ≥ σ 2 ≥ σ 3) is examined in this paper.Because the true-triaxial experimental test data available in the literature are limited and do not cover a ...

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 …

Mechanical Properties of Intact Rock and Fractures in ...

INTACT ROCK PROPERTIES For the intact rock pieces that make up the rock mass equation (1) simplifies to: s s s s 1 3 s 3 05 ' ' 1 ' . = + + ci i ci m (4) The relationship between the effective principal stresses at failure for a given rock is defined by two constants, the uniaxial compressive strength s ci and a constant m i. Wherever possible ...

(PDF) Strength of intact rock and rock masses

strength, stiffness, and durability. • Select reppp gresentative specimens for testing • Recognize importance of QA/QC for mitigating common errors during lab testingmitigating common errors during lab testing of intact rock. Title: Microsoft PowerPoint - Presentation-6 [Compatibility Mode]

Geotechnical Modelling for Kimberlite Pipes

The rock mechanics of kimberlite volcanic pipe excavation ... difference between intact rock strength and rock mass strength. The strength of an intact rock sample without fractures as measured in a laboratory is greater than a rock sample that contains discontinuities. Discontinuities are …

Kimberlite - Wikipedia

The Rock Mechanics of Kimberlite Volcanic Pipe Evacuation. Dec 11 2007 · Rock mass strength is empirically derived from the intact rock strength and quantification of the shear strength frequency and orientation of rock discontinuities.

GSI: A GEOLOGICALLY FRIENDLY TOOL FOR ROCK MASS …

The first part presents an overview of the strength of intact rock. A short. commentary on various methods of fitting failure criteria to experimental data follows, it is demonstrated.

Chapter 4 Engineering Classification of Rock Materials

strength of intact rock core specimens. 1.2 The values stated in inch-pound units are to be regarded as the standard. The SI values given in parentheses are for information only. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the

ARTICLE IN PRESS

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 constant . Wherever

(PDF) Intact rock strength | George Tsiambaos - Academia.edu

Intact rock strength envelopes and mi estimation for Ano Liossia limestones. G. Tsiambaos, N. Sabatakakis / Engineering Geology 72 (2004) 261–273 267 better, exhibiting a R-square value equal to 0.82. The the data points around the fitted regression line of data good fit of the power regression, shown in Fig. 1, is rather normal and uniform ...

Geotechnical Modelling for Kimberlite Pipes

3 surface as a function of the normal stress is required. Procedures to deal with this obstacle will be discussed in Chapter 3 of this report. For intact rock, s = 1 and m = mi.Values for mi can be calculated from laboratory triaxial testing of core samples at different confining stress, or …

Standard Test Method for Unconfined Compressive Strength …

The rock triaxial test is performed according to IS-13047-2010 and shear parameters are obtained for three different confining pressures viz. 3, 5 & 7 N/mm2 for the intact and for different rock matrix pattern specimens of Millionite limestone & Dolomite at the constant strain rate of 0.315 mm/min.

Practical estimates of rock mass strength

intact rock, hence Hoek–Brown strength envelopes for each phase 6/7 kimberlite type. This was deemed appropriate because, in common with the vast majority of …

Measuring Rock Strength | Soil Surveys

strength of intact rock core specimens. 1.2 The values stated in inch-pound units are to be regarded as the standard. The SI values given in parentheses are for information only. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the

(PDF) Research paper The rock mechanics of kimberlite ...

The hardness of Kimberlite is 6-7 whereas its compressive strength is Not Available. Streak is the color of rock when it is crushed or powdered. The streak of Kimberlite is white whereas its fracture is conchoidal. Luster of Kimberlite is the interaction of light with the surface of Kimberlite. Luster of Kimberlite is subvitreous to dull ...

STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1 ...

In general, compared to intact rock, a rock mass has reduced tensile strength (almost zero), and reduced shear strength especi ally along discontinuity planes. Furthermore, if a rock mass is cut by directional joint sets, the rock mass strength is anisotropic. Rock mass strength is scale dependent and varies with the volume of rock under ...