Overburden Correction for Shear Wave Velocity
Overburden Correction for Shear Wave Velocity
(OP)
Determination of Liquefaction Susceptibility/Potential may involve utilization of shear wave velocity which is corrected for overburden stress.
My question is why/how is shear wave velocity impacted by overburden stress and why is a correction necessary (I cannot rationalize this in my mind)? Seems like if the shear wave velocity is higher at depth, then the soil/sands would be stiffer (more dense).
My question is why/how is shear wave velocity impacted by overburden stress and why is a correction necessary (I cannot rationalize this in my mind)? Seems like if the shear wave velocity is higher at depth, then the soil/sands would be stiffer (more dense).
RE: Overburden Correction for Shear Wave Velocity
(Empirically, shear modulus is roughly proportional to (sigma'v)^0.5 By theory of elasticity, SWV is proportional to (shear modulus)^0.5. Therefore, SWV is roughly proportionals to (sigma'v)^0.25.)
I think I got that right, without taking time to look it up.