3
5337.0 4926.3 7426.4 1105.6 999.3 386.6
1402.5 1281.0 978.2
90.0 70.0 3680.0 700.0
(2) Homestake
0.272E+07 0.400E+07 0.391E+07 0.06 0.30 0.22
0.191E+07 0.110E+07 0.913E+06 0.00 0.00 0.00
9297.0 8847.9 7489.7 635.8 1280.2 738.8
1403.7 1943.1 1358.1
90.0 70.0 4380.0 120.0
(3) Poorman
0.303E+07 0.407E+07 0.348E+07 0.09 0.31 0.18
0.192E+07 0.117E+07 0.871E+06 0.00 0.00 0.00
6459.5 6685.2 6947.7 1417.0 1040.6 569.7
1746.7 1522.8 1148.6
90.0 70.0 4500.0 700.0
The first two lines following the formation name are
Young’s moduli E and Poisson’s ratios v the second line
contains shear moduli G and specific weight components
γ (when gravity stresses are needed). The next two lines are
unconfined compressive, tensile and shear strengths C, T
and R. Units are psi. The last line gives the dip direction
(deg), dip (deg), depth (ft) and thickness (ft) of the named
formation. The equivalent strengths in this file are based on
an energy-to-failure criterion. Full details are explained in a
User Manual (Pariseau 2022).
Step 2 Mesh Generation Mesh generation input is saved
in an InData file that is developed during mesh generation
for the ramp. Thus,
Input Data
"RAMPS" NPROB 9
Ramps Shape =Arched Rectangle
Ramp System =Single Opening
Ramp Width =11.0
Width/Height Ratio =1.0
Ramp Height= 11.0
Section Depth Seam Center (ft) =4850.0
Additional Sxx,Syy=,Szz,Tyz,Tzx,Txy, tension +=psi
-4648.0 -6062.0 -2788.0 0.0 0.0 0.0
Ramp Stress Sxx,Syy=,Szz,Tyz,Tzx,Txy, tension +=psi
-4648.0 -6062.0 -2788.0 0.0 0.0 0.0
No gravity stress is applied rather, the premining stress is
“additional” and based on formulas developed for the mine
from many in situ stress measurements (Pariseau 1985).
Stresses follow the section attitudes and are automatically
rotated to the section orientation (dip and azimuth).
Boundary conditions are applied to the top, bottom
and sides of the sections (“slabs”) and prevent perpendicu-
lar displacement s (“rollers”). Normal displacements are also
prevented on the external faces of the first and last sections.
A switchback ramp begins on the horizontal and then
rapidly transitions to the design grade. The ramp transitions
again to the horizontal at the ramp bottom. Figure 3 shows
a mesh in longitudinal section of a ramp with a design
grade of 15 percent. The mesh is mainly in the footwall
Poorman formation in this simplified example. The uni-
form color (white) of the figure indicates the section is all in
Figure 3. A long section of a switchback ramp with a design grade of 15 percent. The ramp is approximately 550 ft (168 m)
long and declines 75 ft (23 m). Level interval is 150 ft (46 m)
5337.0 4926.3 7426.4 1105.6 999.3 386.6
1402.5 1281.0 978.2
90.0 70.0 3680.0 700.0
(2) Homestake
0.272E+07 0.400E+07 0.391E+07 0.06 0.30 0.22
0.191E+07 0.110E+07 0.913E+06 0.00 0.00 0.00
9297.0 8847.9 7489.7 635.8 1280.2 738.8
1403.7 1943.1 1358.1
90.0 70.0 4380.0 120.0
(3) Poorman
0.303E+07 0.407E+07 0.348E+07 0.09 0.31 0.18
0.192E+07 0.117E+07 0.871E+06 0.00 0.00 0.00
6459.5 6685.2 6947.7 1417.0 1040.6 569.7
1746.7 1522.8 1148.6
90.0 70.0 4500.0 700.0
The first two lines following the formation name are
Young’s moduli E and Poisson’s ratios v the second line
contains shear moduli G and specific weight components
γ (when gravity stresses are needed). The next two lines are
unconfined compressive, tensile and shear strengths C, T
and R. Units are psi. The last line gives the dip direction
(deg), dip (deg), depth (ft) and thickness (ft) of the named
formation. The equivalent strengths in this file are based on
an energy-to-failure criterion. Full details are explained in a
User Manual (Pariseau 2022).
Step 2 Mesh Generation Mesh generation input is saved
in an InData file that is developed during mesh generation
for the ramp. Thus,
Input Data
"RAMPS" NPROB 9
Ramps Shape =Arched Rectangle
Ramp System =Single Opening
Ramp Width =11.0
Width/Height Ratio =1.0
Ramp Height= 11.0
Section Depth Seam Center (ft) =4850.0
Additional Sxx,Syy=,Szz,Tyz,Tzx,Txy, tension +=psi
-4648.0 -6062.0 -2788.0 0.0 0.0 0.0
Ramp Stress Sxx,Syy=,Szz,Tyz,Tzx,Txy, tension +=psi
-4648.0 -6062.0 -2788.0 0.0 0.0 0.0
No gravity stress is applied rather, the premining stress is
“additional” and based on formulas developed for the mine
from many in situ stress measurements (Pariseau 1985).
Stresses follow the section attitudes and are automatically
rotated to the section orientation (dip and azimuth).
Boundary conditions are applied to the top, bottom
and sides of the sections (“slabs”) and prevent perpendicu-
lar displacement s (“rollers”). Normal displacements are also
prevented on the external faces of the first and last sections.
A switchback ramp begins on the horizontal and then
rapidly transitions to the design grade. The ramp transitions
again to the horizontal at the ramp bottom. Figure 3 shows
a mesh in longitudinal section of a ramp with a design
grade of 15 percent. The mesh is mainly in the footwall
Poorman formation in this simplified example. The uni-
form color (white) of the figure indicates the section is all in
Figure 3. A long section of a switchback ramp with a design grade of 15 percent. The ramp is approximately 550 ft (168 m)
long and declines 75 ft (23 m). Level interval is 150 ft (46 m)