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The elastic modulus of intact rock is used for many rock engineering projects, such as tunnels, slopes, and foundations, but due to the requirements of high-quality core samples and associated sophisticated test equipment, instead the use of empirical models to obtain this parameter has been an attractive research topic.

from corresponding intact rock specimens (Ei) (Farmer and Kemeny, 1992; Wyllie, 2003). Accurate prediction of rock mass deformation is crucial in a wide variety of ... rock mass elastic modulus (Link, 1964; Kujundzíc and Grujíc, 1966). In general, elastic moduli increase at

Rock strength and modulus properties determined on small intact hand samples - does not necessarily match field conditions Weakest link principle = overall strength of a rock not

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, .

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 .

young's modulus of rock ... Young’s modulus, . strength and deformability of intact rock was investigated thoroughly. » Learn More. ROCK MECHANICS ROCK MECHANICS - Academia.edu. ... THE DEFORMATION MODULUS OF ROCK . than modulus of elasticity or Young's modulus. . that in situ tests of the deformation modulus of rock masses are .

For instance, Farmer and Kemeny (1992) found that the deformation modulus on intact rock samples is in the order of 5 to 20 times higher than in situ values. The variation in blockiness or degree of

and unit weight as input to predict elastic modulus of intact rock. Maji and Sitharam [11], on the other hand, applied. back propagation algorithm and radial basis function to predict elastic modulus of jointed rocks from the elastic modulus of intact

The laboratory tests have been used most frequently to determine Modulus of Elasticity of rocks. The intact core rock samples representing the region were tested to determine their Young's modulus ...

in a rock mass, the modulus of deformation of rock may be quite different from its modulus of elasticity. Recall that the modulus of deformation is based on the total measured deformation

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.

geometrical properties of discontinuities and elastic modulus of intact rock. In this extension, the effect of confining stress was incorporated in the formulation to improve its reliability.

Strength and Modulus of Weathered Rock from SPT Values In the weathered rock it is difficult to drive the split sampler to the full specified depth as in soil. Hence we may estimate the strength and elastic modulus values of weathered rock by driving the spt apparatus for a fixed number of blows and find […]

Deformation, strain and modulus. Application of a single (vertical) stress is one typical experiment run to measure material mechanical properties ... For the rest of this topic, however, we will deal only with small deformations and stresses such that the rock remains in the elastic region.

D7012 - 14e1 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 ...

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 …

THE DEFORMATION MODULUS OF ROCK MASSES - comparisons between in situ tests and indirect estimates , Modulus of elasticity or Young''s modulus ( E ): , For instance, Farmer and Kemeny (1992) found that the deformation modulus on intact rock samples is in the order of 5 to 20 times higher than in situ valu The variation in blockiness or ....

Terzaghi’s intact rock Tunnel Rock mass ROCK MASS An assemblage ... larger-scale modulus and permeability tests In situ stress on cores can not be measured Indirect methods ... curve and estimate the associated elastic parameters of the rock (p>

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 …

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.

GeoTesting Express utilizes state-of-the-art automated testing equipment to perform high-end strength testing of rock (Unconfined Compression, Direct Shear, Brazilian Tensile Strength, Elastic …

Standard Test Methods for Compressive Strength and Elastic Moduli of Intact Rock Core Specimens under Varying States of Stress and Temperatures

creep, brittle strength, and their relation to the elastic modulus Hiroki Sone1 and Mark D. Zoback2 ... Intact and frictional strengths were also reported to understand how brittle strength depends on ... elastic modulus and rock strength is provided.

In the rock mechanics literature, some empirical relations exist between the elastic modulus of intact rock and other rock properties, such as the uniaxial compressive strength (sci), unit weight (g), Schmidt hammer rebound number, point load index and petrographic composition.

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 elasticity of some common are given in the table below.

Standard Test Method for Elastic Moduli of Intact Rock Core Specimens in Uniaxial Compression **ASTM has discontinued this method, the industry-accepted standard test method is now ASTM D7012D Reference Number ASTM D3148 Material. Rock. Test Property. Young's Modulus…

The engineering classification of intact rocks is based on the uniaxial compressive strength and the modulus of elasticity, developed by and Miller. Intact rock is internally continuous, intact, and free from weakness planes such as jointing, bedding, and shearing.

Basalt Rock Bulk Modulus - ramdevpgcollege.org. Values of tensile and cohesive strength for the basaltic rock mass are . for intact rock, the Young's (elastic) modulus and Poisson's.

The elastic properties.650–2.660 kg/m3.Abstract Triaxial compression tests with constant confining pressure. represented by Young’s modulus and the Poisson ratio.3 GPa with a mean value of 69. and it was found that Young’s modulus was in the range 66.9 GPa.

The tangent modulus is lower than the intact rock modulus. In the dynamic, low strain amplitude case, strain amplitudes are typically lower than 10 −6 , so that the behavior is mainly reversible, i.e., purely elastic.

multilateral loading condition using analytical methods M. Ebadi1, S. Karimi Nasab2*, H. Jalalifar3 ... mass elastic modulus using intact rock elastic modulus and lateral stress (σ ... Where E is Young’s modulus of intact rock and L is the sample length. Equation (15) calculates final ...