The image above represents compressional or P waves.

To compute for compressional or P waves, three essential parameters are needed and these parameters are **Dynamic Bulk Modulus of Elasticity (k _{d}), **

**Dynamic Modulus of Rigidity (G**and

_{d})**Elasticity of Rock Mass (p).**

The formula for calculating compressional or P waves:

v_{p} = ^{√[kd + 4/3Gd]} / _{p}

Where:

v_{p} = Compressional or P Waves

k_{d} = Dynamic Bulk Modulus of Elasticity

G_{d} = Dynamic Modulus of Rigidity

p = Elasticity of the Rock Mass

Let’s solve an example;

Given that the dynamic bulk modulus of elasticity is 11, the dynamic modulus of rigidity is 30 and the elasticity of the rock mass is 23. Find the compressional or P waves?

This implies that;

k_{d} = Dynamic Bulk Modulus of Elasticity = 11

G_{d} = Dynamic Modulus of Rigidity = 30

p = Elasticity of the Rock Mass = 23

v_{p} = ^{√[kd + 4/3Gd]} / _{p}

v_{p} = ^{√[11 + 4/3(30)]} / _{23}

v_{p} = ^{√[11 + 40]} / _{23}

v_{p} = ^{√[51]} / _{23}

v_{p} = ^{7.141} / _{23}

v_{p} = 0.310

Therefore, the **compressional or P waves **is **0.310.**

Continue reading How to Calculate and Solve for Compressional or P Waves | Rock Mechanics