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.
HOW TO ESTIMATE STRENGTH AND MODULUS OF …
· 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 the penetration.
Elasticity refers to the property of reversibility of deformation when subjected to a load. Many fresh, hard rocks are elastic when considered as laboratory specimens. But on the field scale rocks can be expected to contain fractures, fissures, bedding planes, contacts, zones of altered rock and clays with plastic properties.
Elastic modulus evolution of rocks under heating–cooling …
· A rock is a natural aggregate of minerals with internal defects (cracks and pores). Therefore, its elastic modulus is determined by both the mineral components and internal defects. Due to the ...
• 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
Relationship between the P Wave Velocity, Static Elastic Modulus, and Dynamic Elastic Modulus …
between the P wave velocity and static elastic modulus follows an exponential regression for all rock types, with a high coefficient of determination that is in the 0.875-0.940 range. Keywords: P wave velocity, static elastic modulus, dynamic elastic modulus, rock
Pore Fluid and Elastic Properties of Rock
3 GP170/2001 #2 Physics of Pore Fluid Effect on Elastic Properties In static (low-frequency) approximation, pore fluid affects only the bulk modulus of rock Gassmann''s Equation -- Basis of Fluid Substitution K Sat K s − K Sat K Dry K s − K Dry K f φ (K s − K f)
Improved correlation between the static and dynamic elastic modulus …
Non-destructive techniques, stone, dynamic modulus, static modulus, rock-40 materials, igneous, sedimentary, metamorphic. 41 42 1. INTRODUCTION 43 The elastic modulus is an important mechanical property of rock and stone in relation to its use 44 45
Modulus of Elasticity
An example: Calculate the σ H and σ h in a coal seam in the Eastern United States at a depth of 2000 ft. The elastic modulus of the coal is 2×10 6 psi. Using Eq. 5.2 and values of B0, B1, and B2 from Table 5.1: σ H = 369 + 1.34 × 2000 + 0.30 × 10 – 3 × 2 × 106 = 3649 psi.
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 Figure 2 ...
Design Manual Engineering Properties of Soil and Rock
(PMT), or Dilatometer (DMT) should be considered for evaluating the elastic modulus of the soil strata. Typical elastic modulus values of predominately granular materials are shown in Table 3. Table 3: Typical elastic modulus values for granular s oil (modified.
Foundations - Elasticity of Rock. It is not appropriate to classify rocks by elastic constants alone, since many rocks are nonelastic. Elasticity refers to the property of reversibility of deformation when subjected to a load. Many fresh, hard rocks are elastic when considered as laboratory specimens. But on the field scale rocks can be ...
STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1. INTRODUCTION 2. TESTING OF INTACT ROCK …
represents the elastic rock response. Using AE (acoustic emission) devices, it has been found ... flexural strength (sometimes called the modulus of rupture) is calculated as the maximum tensile stress existing on the lower fiber of the beam at peak load ...
WHAT ARE THE VALUES OF MODULUS OF ELASTICITY & POISSON''S RATIO …
WHAT ARE THE VALUES OF MODULUS OF ELASTICITY & POISSON''S ...
ELASTIC MODULI and PHYSICAL PROPERTIES of ROCKS
ELASTIC MODULI and PHYSICAL PROPERTIES of ROCKS Content YOUNG''S MODULUS (E) BULK MODULUS OR INCOMPRESSIBILITY (K) POISSON''S RATIO (σ) SHEAR MODULUSL 0 L A F E ∆ ∆ = This modulus reflects the stiffness of earth materials. E is the ratio of stress to strain..
modulus of elasticity of basalt rock
Improving Elastic Modulus Measurements for Rock ... - Inside Mines were performed on 78 samples of nine rock types, including two basalts, two granites, two limestones, a …
Performance analysis of drilling machines using rock modulus …
of elastic modulus to compressive strength, indicating the deformability, is a very important rock property. However, there is no available published material on the relationship between modulus ratio and drilla-bility. In this study, the correlations between ...
Elastic modulus on rocks
Elastic modulus of rock specimens in uniaxial and triaxial tests Automatic System with pace rate control also when releasing the load. It can be used with a Matest high stability frame with capacity of 2000, or 3000 kN coupled to the Automatic Servo-controlled system "Servo-Plus Evolution" (mod. C104N).
Stress–strain relationship in elastic stage of fractured rock …
· The elastic modulus of rock mass is positively related to the friction angle and cohesion of the discontinuities and is inversely correlated with the average radius and density of the discontinuities. Similarly, when the normal stress at the planes increase, the ...
Elasticity of marine sediments: Rock physics modeling
elastic moduli of the solid phase, and effective pressure. The model connects two end points in the elastic-modulus- porosity plane: the Hertz-Mindlin modulus of a dense elastic sphere pack at critical porosity; and zero at porosity. The elastic
Rock Subgrade Modulus
· This stress increase will result in deformation of the rock mass, based on the elastic properties of the rock mass. This is a different mechanic from subgrade modulus (i.e., k), which is related to a spring constant in the structural design of slabs on grade. This has some reference to intact rock and rock mass moduli values and the factors ...
deformation modulus of rock masses was made by Hoek and Diederichs (2006). This chapter presents the most recent version of the Hoek-Brown criterion in a form that has been found practical in the field and that appears to provide the most reliable set of
Estimating in situ rock mass strength and elastic modulus of …
Estimating in situ rock mass strength and elastic modulus of granite from the Soultz‑sous‑Forêts geothermal reservoir (France) Marlène C. Villeneuve 1*,Michael J. Heap2,Alexandra R. L. Kushnir2,Tao Qin3,Patrick Baud2,Guanglei Zhou4 and Tao Xu4 Abstract
Elastic Modulus and Strength of Rock-Like Material with Locked …
MathematicalProblemsinEngineering 0 2040 6080 100 0.0 0.2 0.4 0.6 0.8 1.0 Equivalent elastic modulus Inclusion content (%) Voigt upper limit of E 1 =0.6 M-T curve of ...
DEFORMABILITY PROPERTIES OF ROCKS AND ROCK MASSES 1. …
The Young''s modulus, Poisson''s ratio and shear modulus can be determined by dynamicmethods. Dynamic elastic properties are obtained by rapid application of stress to a rockspecimen. One method of achieving this is to subject the specimen to ultrasonic compressionand shear wave pulse using a so-called sonic velocity equipment (see section 5 in Lecture Notes
Rock mechanical properties
· 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
DEFORMABILITY PROPERTIES OF ROCKS AND ROCK MASSES 1. INTRODUCTION 2. DEFORMABILITY OF INTACT ROCK
2.2 Dynamic Elastic Constants The Young''s modulus, Poisson''s ratio and shear modulus can be determined by dynamic methods. Dynamic elastic properties are obtained by rapid application of stress to a rock specimen. One method of achieving this is to
WHAT ARE THE VALUES OF MODULUS OF ELASTICITY & …
· 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 …
What is an Elastic Modulus?
· The elastic modulus is a material property that describes its stiffness and is therefore one of the most important properties of solid materials. It is the ratio of stress to strain when deformation is totally elastic. Stress is defined as force per unit area and strain as …
(PDF) MODULUS OF ELASTICITY DETERMINATION OF …
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 the laboratory using three different means.
How to Calculate Elastic Modulus | Sciencing
· Elastic modulus ( E ) is a measure of the stiffness of a material under compression or tension, although there is also an equivalent shear modulus is a property of the material and does not depend on the shape or size of the object. A small piece of rubber has the ...
The elastic constants (Methods B and D) are used to calculate the stress and deformation in rock structures. 5.3 The deformation and strength properties of rock cores measured in the laboratory usually do not accurately reflect large-scale in situ properties because the latter are strongly influenced by joints, faults, inhomogeneity, weakness planes, and other factors.
ELASTIC PROPERTIES AND POROSITY
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 1 2 3 4
· These elastic constants include the following: (1) Young''s modulus ( E) is the ratio of the applied stress to the fractional extension (or shortening) of the sample length parallel to the tension (or compression). The strain is the linear change in dimension divided by the original length.
Empirical Estimation of Rock Mass Modulus
proposed two new equations for empirical estimates of the deformation modulus of rock masses. These estimates are based on the Geological Strength Index (GSI), the deformation modulus of the intact rock (E i) and the rock mass damage factor (D
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