For the two scenarios, the Reuss (lower) bound of the elasticity modulus of the intact rock mass is estimated in the range 6,300 6,600 MPa. Assuming Poison s ratio of 0.3, G of the intact rock mass is estimated in the range of 2,400 2,600 MPa. It should be noted that these values relate to the same

2. ON DEFORMATION AND ELASTIC MODULI 2.1 Definitions Deformability is characterized by a modulus describing the relationship between the applied load and the resulting strain. The fact that jointed rock masses do not behave elastically has prompted the usage of the term modulus of deformation rather than modulus of elasticity or Young's modulus.

Jan 01, 2009· The uniaxial compressive strength and static Young's modulus (E s) of intact rocks are the most important geotechnical parameters for stability analysis of surface and underground structures. These parameters are obtained by the uniaxial compressive test. Although this test is simple, the preparation of the samples, especially of soft rocks, is a hard and time consuming task.

ASTM-D7012 Standard Test Methods for Compressive Strength and Elastic Moduli of Intact Rock Core Specimens under Varying States of Stress and Temperatures - bulk modulus; compression testing; compressive strength; confined compression; elastic moduli; loading tests; modulus of elasticity; Mohr stress circle; Poisson's ratio; repeatability; reproducibility; rock; shear modulus; triaxial ...

Measurements of rock mass elastic modulus are scale-dependent (Heuze, 1980), complicating efforts to translate laboratory results from core sample testing to scales relevant for most rock engineering problems (Cai et al., 2004). Micro- and macroscopic discontinuities separating intact rock fragments are compliant variably

elastic modulus of jointed rock mass. They selected two artificial neural network models for prediction of elastic modulus of jointed rock mass from the elastic modulus of corresponding intact rock and joint parameters such as joint frequency, joint inclination and joint roughness. The results this research showed that artificial

Evaluation of rock mass deformability is an important but very challenging task in the analysis and design of underground structures in rock. Although various empirical (correlation) methods have been developed for determining the deformation modulus of rock masses, they come in many forms and are scattered in different sources.

mitigating common errors during lab testingmitigating common errors during lab testing of intact rock. Laboratory Testing of RocksLaboratory Testing of Rocks • Index testing of intact rock materials for ... Deformation Parameters of Intact RkRocks Elastic Modulus from Uniaxial and/or Triaxial Compression Fig. 8-6. Tensile Strength (TTensile ...

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. Typical values of modulus of […]

At any stress level in region AB, the rock will follow a path essentially parallel to AB upon unloading and reloading. In that domain, the rock sample can be modeled as a spring. 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

elastic modulus, or Young's modulus, and shear modulus are used when deformations in underground mines need to be computed. Experimentally, the elastic modulus can be determined from the stress–strain response of a rock sample subjected to uniaxial compression. However, this is a complicated and time consuming experiment. very

Many models have been proposed to estimate the Young's modulus, E, of intact rock based on its uniaxial compressive strength, UCS. 's model, i.e., E = M R ⋅ UCS (where M R is the modulus ratio), is the most accepted one. However, traditional models cannot provide uncertainty estimates of parameters and predictions.

Intact Rock • Continuum of ppy yolycrystalline solid between continuities consisting of an aggregate of minerals or grains. Its properties are governed by ... E = Modulus of elasticity, G = Modulus of rigidity (or Shear modulus) ν= Poisson's ratio, g = gravitational acceleration, γ= Unit weight of the material .

This test method covers the determination of elastic moduli of intact rock core specimens in uniaxial compression. It specifies the apparatus, instrumentation, and procedures for determining the stress-axial strain and the stress-lateral strain curves, as well as Young's modulus, E, and Poisson's ratio, .

ELASTIC MODULI and PHYSICAL PROPERTIES of ROCKS Content YOUNG'S MODULUS (E) BULK MODULUS OR INCOMPRESSIBILITY (K) POISSON'S RATIO (V) SHEAR MODULUS (P) ELASTIC MODULI IN FLUIDS NEGATIVE POISSON'S IN AUXETIC FOAMS COMMON ELASTIC MODULI IN ROCKS Ackowledgements: Thanks to William Doll for detecting errors in this document

D7012-14e1 Standard Test Methods for Compressive Strength and Elastic Moduli of Intact Rock Core Specimens under Varying States of Stress and Temperatures . ... 1.6 For an isotropic material in Test Methods B and D, the relation between the shear and bulk moduli and Young's modulus …

Fracture embedded in an elastic intact rock Although very simple and commonly described in geomechanics textbooks, we develop the expression of the stress, strain, and fracture displacement of a disk-shaped fracture embedded in an elastic medium. ... (i.e. intact rock) with Young's modulus ...

elastic modulus with lateral stress applied on intact rock [1]. Arora has presented an equation to calculate elastic modulus of jointed rock mass using elastic modulus of intact rock and lateral stress (σ 3) [2]. Having carried out a large number of tests, Kulhawy developed an equation to calculate rock

samples. Each intact rock sample was 7 m × 7 m × 14 m and assigned different mechanical properties. The first intact rock sample was assigned a uniaxial compressive strength of 205 MPa and an elastic modulus of 104 GPa with the UCS and elastic modulus values of …

modulus of elasticity of intact rock for practical purposes. The former approach outputs a real number and tries to fit It is concluded that the modulus of elasticity of intact into a regression-based output. The latter approach tries to rock can be estimated sufficiently well …

Engineering Properties of Soil and Rock GUYER PARTNERS 44240 Clubhouse Drive El Macero, CA 95618 ... Stress-strain modulus (modulus of elasticity) and Poisson's ratio. 2. COMPACTION CHARACTERISTICS OF SOILS. ... 4.3 PERMEABILITY OF ROCK. Intact rock is generally impermeable, but completely

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

Mar 10, 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 ...

Deformation and strength of rock are known to be functions of confining pressure. Method A, triaxial compression test, is commonly used to simulate the stress conditions under which most underground rock masses exist. The elastic constants (Methods B and D) are used to calculate the stress and deformation in rock structures.

Uniaxial Compressive Strength, Young's Modulus, Poisson's ratio: Rock, Rock Strength, Rock Unconfined Compressive Strength, Rock Uniaxial Compressive Strength, Elastic Moduli: Details: Standard Test Method for Compressive Strength and Elastic Moduli of Intact Rock Core Specimens under Varying States of Stress and Temperatures: ASTM D7012C

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.

Oct 22, 2016· The joint factor, J f, which is defined as a weakness coefficient in rock mass suggests that modulus ratio of rock mass (M rj) has to be less than the modulus ratio of the corresponding intact rock (M ri), on the basis of extensive experimental evidence. With joint factor, compressive strength, elastic modulus, cohesion and friction angle were ...

Mar 06, 2015· This method of rock classification was introduced by Deer & Miller in the year 1996. Two parameters are considered while classifying rocks on this method, which are Uniaxial compressive strength Modulus of elasticity Step by Step Method to Classify Rock Based on Engineering Parameters) This method of rock classification consists of 3 steps, as given […]

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