The image above represents shear force or S waves.

To compute for shear force or S waves, two essential parameters are needed and these parameters are **Dynamic Modulus of Rigidity (G _{d}) **and

**Elasticity of Rock Mass (p).**

The formula for calculating shear force or S waves:

v_{s} = ^{√(Gd)} / _{p}

Where:

v_{s} = Shear Force or S Waves

G_{d} = Dynamic Modulus of Rigidity

p = Elasticity of Rock Mass

Let’s solve an example;

Find the shear force or s waves when the dynamic modulus of rigidity is 12 and the elasticity of rock mass is 28.

This implies that;

G_{d} = Dynamic Modulus of Rigidity = 12

p = Elasticity of Rock Mass = 28

v_{s} = ^{√(Gd)} / _{p}

v_{s} = ^{√(12)} / _{28}

v_{s} = ^{3.46} / _{28}

v_{s} = 0.12

Therefore, the **shear force or S waves **is **0.12.**

**Calculating the Dynamic Modulus of Rigidity when the Shear Force or S Waves and the Elasticity of Rock Mass is Given.**

G_{d} = (v_{s} x p)^{2}

Where:

G_{d} = Dynamic Modulus of Rigidity

v_{s} = Shear Force or S Waves

p = Elasticity of Rock Mass

Let’s solve an example;

Find the dynamic modulus of rigidity when the shear force or s waves is 21 and the elasticity of rock mass is 14.

This implies that;

v_{s} = Shear Force or S Waves = 21

p = Elasticity of Rock Mass = 14

G_{d} = (v_{s} x p)^{2}

G_{d} = (21 x 14)^{2}

G_{d} = (294)^{2}

G_{d} = 86436

Therefore, the **dynamic modulus of rigidity **is **86436.**

Continue reading How to Calculate and Solve for Shear Force or S Waves | Rock Mechanics