Frequency and Hydraulic Conductivity

The Octave program fqKVMBscan.m presents the model's representation of a soil's dynamic behavior under different shaking frequencies. For the case of 30% porosity, Figure 68 shows that increasing hydraulic conductivity (Kd) should produce more friction as represented in the KV damping ratio when the pore fluids are coupled to the frame.

Figure 68: Octave program, fqKVMBscan.m, can be run to illustrate the relationships possible between hydraulic conductivity and KV damping ratio, the metric for viscous friction.

Interestingly, when one looks at uncoupled behavior, the reverse is true. Increasing permeability decreases the KV damping ratio, and there is less friction at those high frequencies.