EGEE 520 Spring Semester, 09 Speaker: Amirreza Ghasemi.

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Presentation transcript:

EGEE 520 Spring Semester, 09 Speaker: Amirreza Ghasemi

There are two main methods to calculate rock mass modulus: ASTM Standard UNAL Method

VW I = VW E  VW E = Boundary forces (f) × Boundary Displacements (virtual) (u)  VW I = Body strain resulting from virtual displacement ( ɛ ) × Stress change due to boundary conditions (σ) f = K u K= ∫ v a T.D.a.dv

20 GPa0.796 mm ? mm ?= 0.796/ * 20 = 17.6

ASTMUNALCOMSOL Min Max Mean Median Mode736.0 STD Skewness Count69

ν= 0.2ν= 0.25 ν= 0.3 (Base Case) ν= 0.35 Min Max Mean Median Mode STD Skewness 0.9 Count 69

 Results from ASTM, Unal, and COMSOL show very good consistency between different methods.  Sensitivity analysis shows that Rock mass modulus is not very sensitive to change in Poisson's ratio.