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ENFORCE26641
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ENFORCE26641
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Last modified
8/24/2016 7:34:31 PM
Creation date
11/21/2007 11:22:18 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1977378
IBM Index Class Name
Enforcement
Doc Date
11/17/2003
Doc Name
Consent Decree 94CV5459
From
Gold King Mines Corp.
To
DMG
Media Type
D
Archive
No
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Project Design Mogul Tunnel Bulkhead <br />10.6' x 9.5' (9' Thick, Station 2+41) <br />References used: <br />By JFA Date 8/21/03 <br />Sheet 1 of 6 <br />Calculations are based on: <br />Abel, J.F., Jr., Bulkhead desien for acid mine drai~e: 1998, in Prce Western U.S. Mining-Impacted Watersheds, <br />Join[ Conf on Remediation and Ecological Risk Assesment Technologies, Denver, CO, 36 p <br />American Concrete Institute, 1995, Building code requirements for structural concrete (ACI 318-95) and <br />commentary -ACI 318R-95:369 p <br />Wang, C.K. & C.G. Salmon, 1985, Reinforced concrete design, 4th ed, Harper & Rowe Publishers, Inc. <br />Notation• <br />a =minimum concrete compression mne <br />depth (in) to balance rebar tension <br />A , = azea of rebaz (in3) <br />bw =beam width (1-ft) <br />B p =allowable breakdown pressure (psi) <br />d = max distance compressive fiber to rebar <br />center (in) <br />E ym =earthquake bulkhead mass (lb) <br />E rm =earthquake static fluid load (Ib) <br />fit =concrete tensile strength [3(f~)tn] <br />f~$ =concrete shear strength [2(f~)tn) <br />FS =factor of safety <br />L =bulkhead (beam) thickness (ft) <br />L s =bulkhead shear thickness (ft) <br />I =moment of inertia (in4) <br />K = [3.5.2. SRvI~/dl] <br />M =beam bending moment (ft-Ib) <br />In uts: <br />Beam width, b µ, := 1 ft <br />Bulkhead depth below surface, B d := 137 ft <br />Maximum tunnel height, h := 9.5 ft <br />Maximum tunnel width, 1 := 10.6 ft <br />Design water head H := 218 ft <br />Concrete compressive strengtlt;o := 3000 psi <br />Inbye line of sight water distance$ Is := 420 ft <br />Overburden rock density, y r := 169.4 pcf <br />Concrete density, y ~ := 150 pcf <br />Water density, y w := 62.4 pcf <br />Minimum concrete rebar cover,m ~ := 3.5 in <br />Rebar yield strength, f y := 60000 psi <br />Allowable pressure gradient with pressure <br />grouting of bulkhead/rock contact, P a~ '= 41 psi. <br />M „ =factored beam bending moment (ft-lb) <br />M a =nominal beam bending moment (ft-lb) <br />M „a =earthquake beam bending moment (ft-lb) <br />p =maximum hydraulic pressure head (psi) <br />pw = ratio of tensile reinforcement <br />S =section modulus (in3) <br />T =tensile bending force (lb/ft) <br />U =factored required strength (lb/ft) <br />U a =earthquake required strength (Ib/ft) <br />V =concrete sheaz strength (]b/R) <br />Gravity acceleration, g := 32.2 ft/sec2 <br />Maximum credible earthquake acceleratioq := 0.094 •g <br />Bulkhead trial thickness, L t := 9 ft <br />Strength reduction factors <br />Rebar flexural tensile strength, ~ rt := 0.90 <br />Rebar reinforced concrete sheaz, ~ ~ := 0.85 <br />Plain concrete flexure strength, ¢ pc := 0.65 <br />Reinforced concrete flexural strength, re := 0.85 <br />r~jcabrar~wrursa.w <br />
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