Empirical Relationship For Rock Mass Strength

EMPIRICAL STRENGTH CRITERION FOR ROCK MASSES

EMPIRICAL STRENGTH CRITERION FOR ROCK MASSES

 · An empirical strength criterion for rocks and rock masses is proposed. The nonlinear criterion includes the uniaxial compressive strength of the intact rock material and introduces two dimensionless parameters, m and s. The parameter m varies with rock type, the angle of interblock or interparticle friction and the degree of block or particle interlock. The parameter s varies from for ...

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THE EFFECTS OF HYDROTHERMAL ALTERATION ON MECHANICAL ROCK .

THE EFFECTS OF HYDROTHERMAL ALTERATION ON MECHANICAL ROCK .

EMPIRICAL RELATIONS BETWEEN ROCK STRENGTH AND PHYSICAL PROPERTIES Latasha Wyering1, Marlene Villeneuve1 and Irene Wallis2 1 Deparment of Geological Sciences, University of Canterbury, P O Box 4800, Christchurch 8140, New Zealand 2 Mighty River Power, 283 Vaughan Road, P O Box 245, Rotorua 3040, New Zealand . Keywords: Mechanical, physical, rock .

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Estimating the rock mass deformation modulus: A ...

Estimating the rock mass deformation modulus: A ...

1. Introduction. The deformation modulus of the rock mass, E rm, is an essential input parameter for many analyses of jointed rock mass behavior that includes deformations (Hoek and Diederichs, 2006).It can be estimated directly through field tests or indirectly by using empirical relationships based on classifiion schemes,, Rock Quality Designation ( et al., 1967), Rock Mass ...

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Determination of the mechanical parameters of rock mass ...

Determination of the mechanical parameters of rock mass ...

As shown in the above formulae, in estimating the mechanical parameters of rock mass based on the HB failure criterion, the basic factors are geological strength index (GSI), uniaxial compressive strength of intact rock (σ ci), disturbance factor (D), and material constant of intact rock (m i).The uniaxial compressive strength of intact rock (σ ci), Poisson ratio (μ), deformation modulus ...

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Estimating HoekBrown Rock Mass Strength Parameters from ...

Estimating HoekBrown Rock Mass Strength Parameters from ...

deriving a relationship between rock mass strength and a clas­ sifiion. Hoek and Brown (9) showed a plot of the parameters and the ratio mlm; against the NGI and adjusted RMR classifi­ ion ratings ( 4) estimated for intact, undisturbed jointed and recompacted andesites in the initial publiion on the empirical strength criterion for rock masses. The two classi­ fiion schemes were ...

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RQD CLASSIFICATION OF ROCK MASSES

RQD CLASSIFICATION OF ROCK MASSES

determining the quality of rock masses, however, it is not sufficient for an adequate description of the rock mass. The main disadvantages of this classifiion system are susceptibility to direction of measurement (orientation of cracks), thickness of the crack, crack infill, as well as to variation of spacing of cracks. This work presents the basics of the RQD classifiion, upon which the ...

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A Rock Mass Strength Concept For Coal Seams

A Rock Mass Strength Concept For Coal Seams

Coal strata strength is included as a vague term in most of the pillar design formulas, either as a questionable fraction of the intact coal strength or a sizedependent relationship for scaling down a laboratory value to the in situ strength. In order to introduce a coal mass strength criterion which would be compatible with current design trends, the Rock Mass Rating (RMR) system was revised ...

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EMPIRICAL STRENGTH CRITERION FOR ROCK MASSES. DISCUSSION ...

EMPIRICAL STRENGTH CRITERION FOR ROCK MASSES. DISCUSSION ...

EMPIRICAL STRENGTH CRITERION FOR ROCK MASSES. DISCUSSION AND CLOSURE. Bieniawski and employ Hoek and Brown's empirical strength criterion on coal from eight different regions in the to demonstrate its practical appliion in coal mining estimating the in situ strength of coal pillars. The mean values of M when S equals one varied widely, from to In their closure, .

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Physical, empirical and numerical modeling of jointed rock ...

Physical, empirical and numerical modeling of jointed rock ...

Rock mechanics and rock engineering researchers have dealt with this topic for more than 50 years. The aim of this paper is to provide the stateoftheart on estimation of jointed rock mass strength using physical, empirical and numerical modeling methodologies.

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8. STRENGTH OF SOILS AND ROCKS

8. STRENGTH OF SOILS AND ROCKS

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. The size dependancy is also found to exist for stiff fissured clays, as illustrated in Fig. for London clay. Rocks with parallel arrangements of minerals or joints have been found to be ...

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Empirical design methods in practice

Empirical design methods in practice

the rock mass as inputs. Empirical design methods are evolving and the appliion of some of these methods is becoming confusing. The methods are being modified and used within new ground conditions and mining environments, sometimes without regard to the original conditions that the design methods were developed for. It is critical to know thy database as empirical design must interpolate ...

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Discussion of

Discussion of "Empirical Strength Criterion for Rock ...

Discussion of "Empirical Strength Criterion for Rock Masses" (September 1980) See related content by Z. T. Bieniawski, J. , Serial Information: Journal of the Geotechnical Engineering Division, 1982, Vol. 108, Issue 4, Pg. 670672 Document Type: Discussion Closure Subject Headings: Rock masses | Strength of materials Services: Buy this book/Buy this article

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use has led to empirical correlations between rock mass properties and the rock mass classifiions. These rock mass classifiion methods have been previously employed at Yucca Mountain (Langkopf and Gnirk, 1986) for ground support design. Variability of rock quality and hence mechanical properties is indied at the YMP from the core logging data (Lin. et al 1992a). The potential ...

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Module 6 Lecture 1

Module 6 Lecture 1

Coulomb distinguishes soil and rock only based on its relative strength. The soil was considered to be a rigid homogeneous material similar to rock mass. This onephase material ruptures into two different blocks at failure. Based on his experiments on solid rock samples, Coulomb hypothesized that these blocks slide on each other along the slip surfaces. The state of soil at peak stress was ...

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Empirical Approaches for Weak Rock Masses

Empirical Approaches for Weak Rock Masses

EMPIRICAL APPROACHES FOR WEAK ROCK MASSES Tom Brady and Lewis Martin Spokane Research Laboratory, National Institute for Occupational Safety and Health, Spokane, WA, USA Rimas Pakalnis University of British Columbia, Vancouver,, Canada ABSTRACT A major focus of ground control research pres ently being conducted by the Spokane Research Laboratory of the National .

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Guideline for Rock Mass Classifiion System

Guideline for Rock Mass Classifiion System

The empirical method of rock mass classifiion system is proposed to employed in Sri be Lanka in this guideline. This system is proposed considering geological condition of Sri Lanka on the basis of various and data obtained in civil engineering projects numerous including tunnel projects. Some empirical methods have been utilised for classifiion of rock mass to propose the tunnel support ...

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DEFORMABILITY PROPERTIES OF ROCKS AND ROCK MASSES 1 ...

DEFORMABILITY PROPERTIES OF ROCKS AND ROCK MASSES 1 ...

and in equation (8), D is the rock density in g/cm3. Kazi et al. (1983) proposed an empirical equation relating the uniaxial compressive strength of intact rocks to their dynamic modulus. A statistical analysis of more than 200 tests reported in the literature on seven different rock types yielded the following empirical .

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GSI: A GEOLOGICALLY FRIENDLY TOOL FOR ROCK MASS STRENGTH ...

GSI: A GEOLOGICALLY FRIENDLY TOOL FOR ROCK MASS STRENGTH ...

This paper presents a review of the estimation of rock mass strength properties through the use of GSI. The GSI classifiion system greatly respects the geological constraints that occur in nature and are reflected in the geological information. A discussion is given regarding the ranges of the Geological Strength Index for typical rock masses with specific emphasis to heterogeneous rock ...

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