4920 EVERGREEN WAY STAPLES 2020-02-07

C. 9 ) / lierracon PROJECT Staples Replacement Retaining Wall Page 1 of 16 JOB IVU. 81175122 Jate 3/12/2019 Comp. By ZLK, FSM CHECKED BY: RDL OBJECTIVE Design of soldier pile with a single row of tiebacks and permanent shotcrete face. Also include are sizing of temporary lagging board, headed studs, compensation plates, and stiffeners. Tiebacks and bearing plates for the tieback anchor heads are to be designed by the contractor and submitted to the Engineer for approval. GIVEN • Soldier piles: Grade 50 (min) • Reinforcing bars: Grade 60 (min) • Tieback Tendon: Grade 150 (min) • Headed Studs: Grade 50 (min) • Allowable end bearing: 20 ksf. • Allowable side friction: 2 ksf for portions of pile embedded in ground surface • Lateral Earth Pressures for active, passive, surcharge, and seismic (see below) o Terracon. "Staples Rockery Failure, Everett, Washington" Dated January 11, 2018. • Structural and shotcrete concrete 28-day compressive strength = 4,500 psi Earth Pressure Coefficients Equivalent Maximum Earth Pressure Surcharge Seismic Earth Conditions Fluid Density Apparent Earth Pressure, S(psf) Pressure, E (psf) (pct) Pressure, P (psf) Active (Ka)= 0.33 A = 40 -:: H 1' 5,h1 Passive(Kp)= 3.1 B = 400 pplicable conditions to the above include: For active earth pressure. wall must rotate about base. with top lateral movements of about 0.002 H to 0.004 H. where H is wall height For passive earth pressure to develop. wall must move horizontally to mobilize resistance ✓ Uniform pressures for surcharge and seismic for the full wall height St ire-situ retained soil weight of 120 pcf ✓ Structural fill compacted to 95 percent of modified Proctor maximum dry density ✓ Loading from heavy compaction equipment not included ✓ No hydrostatic pressures acting on wall ✓ No factor of safety. reduction factors. or load resistance factors are applied - Ignore passive pressure in frost zone (assumed to be up to 2 feet)