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Map3D User's Manual
Material Type specifies the material type: Mohr-Coulomb, Hoek-Brown, Drucker-Prager or None.
Standard Deviation specifies the uncertainty you have in the failure criterion measured in the
direction.
oct
Tension Cutoff, UCS, Friction Angle the Drucker-Prager criterion defines strength in terms of
principal stresses as follows:
Drucker-Prager
oct
= [UCS + (q-1)
m]
2 /(2+q)
(q-1) 2 /(2+q)
1
UCS 2 /(2+q)
q = tan²(45+ /2)
where
oct
Tension
1 - 2)² + (
Cuttoff
= ¹/3 [(
mean
= ¹/3 (
1
+
2
+
2
-
3)²
+(
3
-
1)²]
½ m
3)
Tension cutoff and UCS are specified in units of stress (MPa or psi). Friction angle is specified in
degrees.
Note that the strength parameters have been chosen so that the criterion simplifies to the MohrCoulomb criterion when 2 equals 3.
Plot – regenerates the contour plot.
Related topics:
Plot > Strength Factor > Probability N-distribution
Plot > Strength Factor > SF-A - Strength/Stress
Plot > Strength Factor > SF-B - Strength/Stress
Plot > Strength Factors > SF-C - Strength/Stress
Plot > Strength Factors > dS1 - Excess Stress
Plot > Strength Factors > dTmax - Excess Stress
Plot > Strength Factors > dToct - Excess Stress
Plot > Strength Factors > In-plane Parameters
Plot > Strength Factors > Ubiquitous Parameters
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