empirical relationship for rock mass strength
Review: GSI and Hoek Brown Procedure
estimating rock mass properties on international tunnelling projects. The Hoek‐Brown failure criterion is an empirical formulation for estimating the confinement‐ strength relationship of a rock mass. It''s non‐linear form distinguishes it from the linear Mohr‐Coulomb failure criterion (Fig. 1a).
Rock mass strength. Rock mass permeability. 3. Rock mass properties determined . in situ. ... To estimate mechanical properties by empirical relationship. Used to estimate stress state (unit weight) and to predict a change in strength and deformability during saturation or drying as well as freeze-thaw processes ... General relationship. Shear ...
Using Rock Mechanics Concepts in Tectonic settings
rock type. Figure 3 gives the strength data for basalt used to obtain an empirical relationship between the ratios for the different Mohr envelope inclination using equation 3. The third step in the methodology is to determine the relationship between vertical component and temperature. The temperature gradient
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 ...
New rock mass classifications for limestone of the Woyla ...
· The rock mass characteristic study, including RMR 89, GSI, and RMR 14 and their empirical relationships, had been conducted at ten slopes in Aceh Province, Indonesia. This study aims to determine the RMR 89, RMR 14 and GSI, as well as develop the empirical relationships among those rock mass classifications especially for limestone of the Woyla group. The scan-line method has …
A new method for evaluating the rock mass damage index ...
The damage index is a crucial controlling parameter for rock mass strength and deformation in civil, geological and mining engineering projects. In this study, a new method was proposed for computing the damage index of a rock mass based on the field point load strength. This method provides a stren …
Missouri University of Science and Technology Scholars'' …
uniaxial compressive strength of rock mass can then be estimated as . CJ = 2ccosq>/(l-sin . cf>) em . The deformation modulus of rock mass was estimated by using an empirical relationship compiled by Chern et at (1997), instead of using the formula suggested by Serafim and Pereira ( 1983) which is more suitable for very hard rocks.
Rock Engineering Practice & Design
Rock Mass Classification The objectives of rock mass classifications are to: Identify the most important parameters influencing the rock mass. Divid k f f l hde a rock mass formation into groups of similar behaviour. Provide a basis for understanding the characteristics of each rock mass class. Relate experiences of rock conditions at one site to those at another.
Determination of blast-induced ground vibration equations ...
Site-speciﬁc empirical relationship between PPV and scaled distance was developed after analysis of experimental data. ... which was introduced byHoek (1994), is a system of rock mass characterization used to estimate rock mass strength for different geological conditions as identiﬁed by ﬁeld observations. After ﬁeld visual observations ...
Empirical Strength Criterion for Rock Masses | Journal of ...
The parameter s varies from 1.0 for intact rock material to zero for granular aggregates and depends on the interparticle tensile strength and the degree of interlock within the rock mass. For anisotropic rock, both m and s vary with the orientations of the planes of weakness to the principal stress directions. Approximate relationships between ...
Strength Assessment of Broken Rock Postgrouting ...
· To estimate postgrouting rock mass strength growth is important for engineering design. In this paper, using self-developed indoor pressure-grouting devices, 19 groups of test cubic blocks were made of the different water cement ratio grouting into the broken rock of three kinds of particle sizes. The shear strength parameters of each group under different conditions were tested.
A Sole Empirical Correlation Expressing Strength of Fine ...
A sole empirical relationship is proposed establishing the normalized ... dered rock and coal fly ash are calculated by mass of the BRS soil. Soils and Rocks, São Paulo, 40(2): 147-153, May-August, 2017. 147 ... A Sole Empirical Correlation Expressing Strength of Fine-Grained Soils - Lime Mixtures
An empirical method for determining the mechanical ...
· Specifically, for this purpose of the determination of rock mass strength, various empirical relations have been proposed using the RQD, GSI, RMR, ... relation. 4 In addition, the (E m /E r)-RQD relation expresses only an empirical relationship, and the parameters ''0.0186'' and ''1.91'' have no apparent physical meaning. 2.2.
COMBINING THE RMR, Q, AND RMi CLASSIFICATION …
The rock mass index, RMi,was first presented by Palmström in 1995 and has been further developed and presented in several papers. It is a volumetric parameter indicating the approximate uniaxial compressive strength of a rock mass, andit can thus be compared with the GSI value. The RMi value is …
NORMAN I. NoIuIsH ROCK STRENGTH PROPERTIES AMD …
The relationship between the strength of sam-ples that can be tested in the laboratory and the 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 ... so a set of empirical equations has been developed
Estimation of Rock Burst Grades Using Rock Mass Strength
In the generalized H-B strength criterion, the σ cm is calculated using the following formula: where σ c is the uniaxial compressive strength of intact rock; s is the empirical parameter reflecting the fracture degree of the rock mass, ranging from 0 to 1, respectively, taking 0 for the fully fractured rock mass and 1 for the intact rock mass ...
Rock mass properties
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
Guideline for Rock Mass Classification System
The empirical method of rock mass classification system is proposed to employed in Sri be ... One of the empirical methods of Geological Strength Index (GSI) also includes similar visual judgement in the system. The Relationship or correlation of these systems with the proposed rock mass classification
1 Rock mass classification
Rock mass classification 5 ''s RQD was widely used, particularly in North America, after its introduction. Cording and (1972), Merritt (1972) and and (1988) attempted to relate RQD to Terzaghi''s rock load factors and to rockbolt requirements in tunnels. In the context of this discussion, the most important use of RQD is as a component of the RMR and Q
Active and Passive Pressures for Bedrock
· If it''s still an issue, try to find "Rock Slope Engineering" by Evert Hoek and John W. Bray, Institution of Mining and Metallurgy, 3rd edition, 1981, pp. 107 - 110. There is an empirical relationship for rock-mass strength based on jointing, weathering, rock type, confining stress, etc.
THE GEOLOGICAL STRENGTH INDEX (GSI): A …
rock mass, in particular the compressive strength of the rock mass ... procedures are explained by Hoek and Brown , but a refinement of the empirical equations and the relationship between the Hoek-Brown and Mohr-Coulomb criteria have been addressed by Hoek et al.  for appropriate ranges of stress encountered in tunnels and slopes. Hoek
(PDF) Quantification of the geological strength index (GSI ...
It is an empirical relationship used to define rock mass shear strength from the inputs of intact strength ( ci), GSI and the material constant (mi), and is applicable to isotropic rock and rock masses, where the block size defined by at least three joint sets is small in comparison to the excavation.
Empirical Strength Criterion for Rock Masses | Journal of ...
1983 Hoek Strength of jointed rock masses - Rocscience Inc.
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 ...
Pillar Strength and Design Methodology for Stone Mines
Pillar strength can be defined as the maximum resistance of a pillar to axial compression (9). In flat lying deposits, pillar compression is caused by the weight of the overlying rock mass. Empirical evidence suggests that pillar strength is related to both its volume and its …
P-wave velocity test for assessment of geotechnical ...
strength, hardness, density and slake durability index of rock as shown in table 1. However, obtained correlations are not constant and can be varied with rock types. This paper attempts to investigate the empirical relationship between Vp and rock properties including the uniaxial compressive strength (UCS), modulus of elasticity (E),
Relation of rock mass characterization and damage
ABSTRACT: There are several empirical relations between the rock mass mechanical parameters (unconfined compressive strength, deformation modulus) and of the rock mass classification systems. These uniformly show increasing deformation modulus and compressive strength with the increasing quality of the rock mass.
A ROCK MASS RATING SCHEME FOR CLASTIC SEDIMENTS …
strength. For purposes of rock mass characterization, Barton [2002, 2006] developed a graphical approach for deter-mining a Q-value and modulus from Vp, porosity, and depth. As a basis, it uses the hard-rock relationship: (4) which Barton derived from results of numerous investiga-tions involving unweathered rocks such as granites,
(PDF) Empirical relationship between strength and ...
Empirical relationship between strength and geophysical properties for weakly cemented formations. 2010. Matt O''Regan. Kate Moran. Matt O''Regan. Kate Moran. Download PDF. ... Experimental and theoretical rock physics research with application to …
A new method for evaluating the rock mass damage index ...
· These empirical relations provide a reliable basis for the evaluation of rock mass strength. In practice, the engineering properties of rock mass are nearly impossible to measure directly. Thus, many researchers have described a damaged rock mass based on classification indices, such as GSI [7,21–23], RQD [18,24–26] and RMR [8,9,15,24,27–29].
Estimating in situ rock mass strength and elastic modulus ...
· Knowledge of the strength and elastic modulus of a reservoir rock is important for the optimisation of a particular geothermal resource. The reservoir rock for many geothermal projects in the Upper Rhine Graben, such as those at Soultz-sous-Forêts and Rittershoffen (both France), is porphyritic granite. High fracture densities (up to ~ 30 fractures/m) in this reservoir rock require that we ...
Design Manual Engineering Properties of Soil and Rock
weak rock may lose strength with time when exposed in cuts. The geotechnical engineer is responsible for choosing design parameters representative of existing and future conditions. Determination of Soil and Rock Properties Subsurface soil or rock properties are generally determined using empirical correlations related to the
Shear strength criteria for rock, rock joints, rockfill ...
· Intact rock. The three-component based empirical equations (using roughness, wall strength and friction) shown in Fig. 1 were mostly derived in Barton (1976). The similarity of shear strength for rock joints and rockfill was demonstrated later in Barton and Kjærnsli (1981).
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