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(PDF) Empirical Estimation of Intact Rock Elastic Modulus
The modulus of elasticity of intact rock (E) is an important rock property which is used as input parameter in the design stage of engineering projects such as slopes, tunnel and mining excavations.
Estimation of Elastic Modulus of Intact Rocks by
10-03-2012· The modulus of elasticity of intact rock (E i) is an important rock property that is used as an input parameter in the design stage of engineering projects such as dams, slopes, foundations, tunnel constructions and mining excavations.
Indirect measurement of the elastic modulus of intact
01-12-2018· Elastic modulus of intact rocks (E) is one of the most important parameters in the initial and final design of rock engineering projects. Laboratory measurements of E require the high quality core samples and expensive tools which cause it is very costly and time-consuming.
[PDF] Prediction of Elastic Modulus of Intact Rocks Using
14-01-2021· Mechanical rock excavation projects require static modulus of elasticity (E) of the intact rock material. High-quality core specimens of proper geometry are nedded for the direct determination of this parameter. However, it is not always possible to obtain suitable specimens from highly fractured and/or weathered rocks for this purpose.
Estimation of Elastic Modulus of Intact Rocks by
01-11-2012· The modulus of elasticity of intact rock ( E i ) is an important rock property that is used as an input parameter in the design stage of engineering projects such as dams, slopes, foundations, tunnel constructions and mining excavations. However, it is sometimes difficult to determine the modulus of elasticity in laboratory tests because high-quality cores are required.
(PDF) Estimation of Elastic Modulus of Intact Rocks by
Estimation of Elastic Modulus of Intact Rocks by Artificial Neural Network
Estimating in situ rock mass strength and elastic modulus
21-06-2018· Intact rock elastic modulus. The elastic modulus describes the linear elastic deformation response of rock under deformation. The static elastic modulus of an intact rock, E i, is typically calculated as the slope of the stress–strain curve of a rock deforming under uniaxial compression (Ulusay and Hudson 2007).
Prediction of Elastic Modulus of Intact Rocks Using
However, the ranges of the modulus ratios of intact rock (MR = uniaxial compressive strength/elastic modulus) are wide and generally overlap for most of the rock types (Fig.1).
[PDF] Prediction of Elastic Modulus of Intact Rocks Using
14-01-2021· Prediction of Elastic Modulus of Intact Rocks Using Artificial Neural Networks and non-Linear Regression Methods. The purpose of this study is developing of a model for estimation of elastic modulus of intact rocks. Mechanical rock excavation projects require static modulus of elasticity (E) of the intact rock material.
Estimation of Elastic Modulus of Intact Rocks by
The modulus of elasticity of intact rock ( E i ) is an important rock property that is used as an input parameter in the design stage of engineering projects such as dams, slopes, foundations, tunnel constructions and mining excavations. However, it is sometimes difficult to determine the modulus of elasticity in laboratory tests because high-quality cores are required.
(PDF) Estimation of Elastic Modulus of Intact Rocks by
Estimation of Elastic Modulus of Intact Rocks by Artificial Neural Network
WHAT ARE THE VALUES OF MODULUS OF ELASTICITY &
13-02-2015· Poisson’s Ratio of Rock. Poisson’s ratio measures the ratio of lateral strain to axial strain at linearly elastic region. For most rocks, the value of Poisson’s ratio ranges in between 0.15 to 0.40. Typical values of modulus of elasticity of some common are given in the table below. Values of Poisson’s Ratio for Some Common Rocks
The Methodology for the Young Modulus Derivation
01-01-2017· Keywords: "rock mechanics, Young's modulus; laboratory rock tests; range of elasticity" The elastic behaviour of rocks and the range of their elasticity are of crucial importance in rock engineering. In solving problems in mining engineering or tunnelling, the change of stress fields forced by an excavation drivage first depends on the elastic and then the post-failure properties of rock.
THE DEFORMATION MODULUS OF ROCK MASSES
Modulus of elasticity or Young's modulus ( E ): The ratio of stress to corresponding strain below the proportionality limit of a material. Values of E for various rocks are shown in Table A-1 in the Appendix. Modulus of deformation of a rock mass ( Em ): The ratio of
Empirical Estimation of Rock Mass Modulus
intact rock modulus E i from the intact rock strength for cases where no reliable modulus measurements are available. Figure 1: Simplified Hoek-Diederichs equation for empirical estimates of rock mass deformation modulus based on the Geological Strength Index (GSI).
Elastic modulus Wikipedia
An elastic modulus (also known as modulus of elasticity) is a quantity that measures an object or substance's resistance to being deformed elastically (i.e., non-permanently) when a stress is applied to it. The elastic modulus of an object is defined as the slope of its stress–strain curve in the elastic deformation region: A stiffer material will have a higher elastic modulus.
ELASTIC PROPERTIES AND POROSITY Stanford Earth
Elastic Moduli (GPa) Clay Content Volume Compressional Modulus Shear Modulus b.2.3 0 0.2 0.4 0.6 0.8 1 Poisson's Ratio c Clay Content Volume The elastic properties of the Ottawa sand and kaolinite mixture are plotted versus the total porosity below. The non-uniqueness of the elastic moduli, and, especially, Poisson's ratio in
WHAT ARE THE VALUES OF MODULUS OF ELASTICITY &
13-02-2015· Poisson’s Ratio of Rock. Poisson’s ratio measures the ratio of lateral strain to axial strain at linearly elastic region. For most rocks, the value of Poisson’s ratio ranges in between 0.15 to 0.40. Typical values of modulus of elasticity of some common are given in the table below. Values of Poisson’s Ratio for Some Common Rocks
Estimation of Elastic Modulus of Intact Rocks by
The modulus of elasticity of intact rock ( E i ) is an important rock property that is used as an input parameter in the design stage of engineering projects such as dams, slopes, foundations, tunnel constructions and mining excavations. However, it is sometimes difficult to determine the modulus of elasticity in laboratory tests because high-quality cores are required.
Elastic Modulus and Strength of Rock-Like Material with
Locked-in stress is a special stress objectively existing in the rock which has an important influence on the mechanical properties. However, there were few studies on the locked-in stress in rocks. The locked-in stress was simplified into spherical inclusions of stress. Based on the Eshelby inclusion theory, the influence equation of the locked-in stress on the elastic modulus of the rock is
Prediction of Young's Modulus of Intact Rock Using
11-01-2021· Many models have been proposed to estimate the Young’s modulus, E, of intact rock based on its uniaxial compressive strength, UCS. Deere’s model, i.e., E = MR · UCS (where MR is the modulus ratio), is the most accepted one. However, traditional models cannot provide uncertainty estimates of parameters and predictions. We present a novel approach, based on Bayesian theory, to
ASTM D7012-14e1 Standard Test Methods for
ASTMD701214e1-Standard Test Methods for Compressive Strength and Elastic Moduli of Intact Rock Core Specimens under Varying States of Stress and Temperatures-
Elastic properties of fractured rock masses
DAVY ET AL.:ELASTIC PROPERTIES OF ROCK MASSES, SUBMITTED TO JGR SOLID EARTH 1 of 13 Elastic properties of fractured rock masses Philippe Davy1, Caroline 2Darcel2, Romain Le Goc,Diego Mas Ivars3 Submitted to Journal of Geophysical 07 December 2017 Abstract.We derive the relationships that link the general elastic properties of rock masses to the geometrical
Experimental Study of Estimating the Subgrade Reaction
properties of the intact rock and by the condition of the discontinuities. There are several studies for determining the elastic modulus of the rock mass using empirical correlations with the rock properties. Heuze (1980) stated that the modulus of deformation of rock masses ranges between 20 and 60 % of the modulus measured on intact rock
ELASTIC PROPERTIES AND POROSITY Stanford Earth
Elastic Moduli (GPa) Clay Content Volume Compressional Modulus Shear Modulus b.2.3 0 0.2 0.4 0.6 0.8 1 Poisson's Ratio c Clay Content Volume The elastic properties of the Ottawa sand and kaolinite mixture are plotted versus the total porosity below. The non-uniqueness of the elastic moduli, and, especially, Poisson's ratio in
Elastic modulus Wikipedia
An elastic modulus (also known as modulus of elasticity) is a quantity that measures an object or substance's resistance to being deformed elastically (i.e., non-permanently) when a stress is applied to it. The elastic modulus of an object is defined as the slope of its stress–strain curve in the elastic deformation region: A stiffer material will have a higher elastic modulus.
DEFORMABILITY PROPERTIES OF ROCKS AND ROCK MASSES 1
If the rock is isotropic, two elastic constants can be introduced to describe its deformability: the Young's modulus, E, and the Poisson' s ratio, <, with and where dF, d,l and d,a are increments of stress, lateral strain and vertical strain, respectively. intact rocks to their dynamic modulus.
WHAT ARE THE VALUES OF MODULUS OF ELASTICITY &
13-02-2015· Modulus of Elasticity of Rock. Modulus of elasticity of rocks depend upon several factors, such as, Type of rock; Porosity; Grain size; Water content; Value of modulus of elasticity can be determined by static or dynamic methods. Higher value of modulus of elasticity indicates good quality rock having sound composition.
Elastic Modulus and Strength of Rock-Like Material with
When the content of the inclusion is 0, it is obvious that the elastic modulus of the rock is the elastic modulus of the intact rock. When the content reaches 1, it becomes a sample composed of the inclusion material, and its elastic modulus is consistent with the inclusion material.
Modelling of the Elasticity Modulus for Rock Using
Abstract. In rock engineering projects, statically determined parameters are more reflective of actual load conditions than dynamic parameters. This study reports a new and efficient approach to the formulation of the static modulus of elasticity applying gene expression programming (GEP) with nondestructive testing (NDT) methods. The results obtained using GEP are compared with the results of
Estimation of Elastic Modulus of Intact Rocks by
Estimation of Elastic Modulus of Intact Rocks by Artificial Neural Network. The modulus of elasticity of intact rock ( E i ) is an important rock property that is used as an input parameter in the design stage of engineering projects such as dams, slopes, foundations, tunnel constructions and mining excavations.
Feasibility of novel techniques to predict the elastic
Elastic modulus of intact rock (E) plays a critical role in designing of civil, mining and rock engineering projects. Generally, this parameter is directly measured in laboratory in which complicated test tools and core specimens with high quality and fitting dimensions are needed.
Estimating in situ rock mass strength and elastic modulus
Variations in rock mass elastic modulus are qualitatively similar (values vary from 1 to 2 GPa up to the elastic modulus of the intact rock, 40 GPa). Our study highlights that macrofractures and joints reduce rock mass strength and should be considered when assessing the rock mass for well stability and rock mass deformation due to stress redistribution in the reservoir.
ELASTIC PROPERTIES OF ROCKS Karagianni Bulletin of
The range of values for Young`s modulus and uniaxial compressive strength is evaluated, while the relationship between elastic and strength parameters is defined. Regression analyses were applied to define relations among these parameters and the range of values of modulus ratio (MR) is estimated for each rock
Rock mechanical properties PetroWiki
09-03-2020· Mechanical properties of rock. Mechanical properties include: Elastic properties (Young’s modulus, shear modulus, bulk modulus, and Poisson’s ratio) [See Stress strain relationships in rocks for calculations of these properties]; Inelastic properties (fracture gradient and formation strength)
Rock Mechanics University of Notre Dame
Intact Rock • 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
ELASTIC PROPERTIES AND POROSITY Stanford Earth
Elastic Moduli (GPa) Clay Content Volume Compressional Modulus Shear Modulus b.2.3 0 0.2 0.4 0.6 0.8 1 Poisson's Ratio c Clay Content Volume The elastic properties of the Ottawa sand and kaolinite mixture are plotted versus the total porosity below. The non-uniqueness of the elastic moduli, and, especially, Poisson's ratio in
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