WHAT ARE THE VALUES OF MODULUS OF ELASTICITY & POISSON’S RATIO FOR DIFFERENT ROCKS?

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 elasticity of some common are given in the table below.

Modulus of Elasticity of Some Common Rocks

Types of Rocks Name of Rocks Youngs Modulus of Elasticity (E), kg/cm2*105
Igneous Rocks Basalt 2.0 – 10.0
Diabase 3.0 – 9.0
Gabbro 6.0 – 11.0
Granite 2.6 – 7.0
Syemite 6.0 – 8.0
Sedimentary Rocks Dolomite 2.0 – 4.4
Limestone 1.0 – 8.0
Sandstone 0.5 – 8.6
Shale 0.8 – 3.0
Metamorphic Rocks Gneiss 2.0 – 6.0
Marble 6.0 – 9.0
Quartzite 2.6 – 10.2
Schist 4.1 – 7.2

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

Types of Rocks Name of Rocks Average Values of Poisson’s Ratio (ν)

Igneous Rocks

Basalt 0.14 – 0.20
Diabase 0.125 – 0.25
Gabbro 0.125 – 0.25
Granite 0.125 – 0.25
Syemite 0.25
Sedimentary Rocks Dolomite 0.08 – 0.20
Limestone 0.10 – 0.20
Sandstone 0.066 – 0.125
Shale 0.11 – 0.54
Metamorphic Rocks Gneiss 0.091 – 0.25
Marble 0.25 – 0.38
Quartzite 0.23
Schist 0.01 – 0.20

 

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