Deformation parameters - Geotechnical Investigation and Design Tables - page 135

- 0.15.

- Use a value of 0.15 for competent unweathered bedrock, and 0.3 for highly
fractured and weathered bedrock.

Poisson's ratio of concrete ∼

11.24 Significance of modulus
•

The relevant modulus value depends on the relative stress influence.

Table 11.24 Significance of modulus (Deere et al., 1967).

Modulus ratios for rock Comments

E d /E conc 0.25 Foundation modulus has little effect on stresses

generated within the concrete mass.

>

0.06 E d /E conc 0.25 Foundation modulus becomes significant with respect

to stresses generated within the concrete mass.

< <

0.06 E d /E conc Foundation modulus completely dominates the stresses

generated within the concrete mass.

<