2000-08-25_REVISION - M1977378

• Permit No: M1977378
• IBM Index Class Name: REVISION
• Doc Date: 8/25/2000
• Doc Name: Response
• From: John F. Abel, Jr.
• To: Sunnyside Gold Corp
• Type & Sequence: TR22
• Media Type: D
• Archive: No

Terry Tunnel Bulkhead #2 Page 7 August 17, 2000
Appendix A. Terry Tunnel near portal bulkhead design calculations
Notation:
a= compression zone depth(in) minimum to balance rebar tension
A5= area of rebar b =beam width (1 ft)
by=web width (12 in) Bp =formation breakdown pressure (psi)
C = comp bending force (lb) c= centroidal distance (in)
D = dead load(fl) d = distance, extreme compression fiber to
Ib
E = earthquake load ($) rebar centroid (in)
E,„ =earthquake mass ib ft z) EE =total earthquake load (lb)
F = fluid load n) FS = factor of safety
fr, = concrete comp strength (3,000 psi) = square root of f4,
f,, = concrete tensile strength (50 f, psi) fs = concrete shear strength (psi)
fy = rebar yield strength(60,000 psi) g= acceleration due to gravity (32.2 Z
H= design water head (469 ft) h=tunnel height (13 ft)
I = moment of inertia K= (3.5—2.5 a°
L=bulkhead (beam) thickness 1 =tunnel width(12.7 ft)
M=bending moment (ft lb) M„=nominal beam moment (ft lb)
M„= factored beam moment (ft lb) M.= earthquake beam moment (ft lb)
m,=minimum cover, form face to S = section modulus (in 3)
rebar surface (3.5 in) S,=line-of-sight distance (3500 ft)
T =tensile bending force (lb) U= required strength a
U.= earthquake required strength V, = concrete shear strength (lb)
Vn= nominal shear force(lb) V.= rebar shear strength (lb)
Vu=factored shear force (lb) v,= rebar shear stress (psi)
Lb
W=total bulkhead load (lb) co=uniform load .
fl
a= earthquake acceleration (0.087 ft2 p=pressure head (203 psi)
sec
pB =pressure gradient psi
pw = ne
bw,d
= strength reduction factors yw =water density(62.4PCF)
0.90 flexure rebar tension y� =concrete density (151PCF)
0.85 concrete shear yr =rock density(173 PCF)
0.65 plain concrete flexure or, =flexure stress (psi)
co=uniform bulkhead design load Z =bulkhead design depth (200 ft)
Load factors (ACI 318, Sec 9.2.2, 9.2.3, 9.2.5)
Static fluid load factor(F) = 1.4;
Factor for fluid load under earthquake acceleration (F) = 1.05;
Earthquake accelerated load factor(E) = 1.40