Answer Happy

An anchored bulkhead system is to be constructed as shown on the following sheet, and a FS of 1.5 is to be used. Assume that the vertical sheet pile wall comprising the anchored bulkhead is frictionless, that the retained soil surface is horizontal (B=0), and that the wall is allowed to move slightly away from the retained soil (active earth pressure). Analyze the bulkhead system and calculate the tension in the tieback anchor. Use the following properties in the analysis and complete the two tables below: • Both the retained soil (at right in diagram), and the resisting soil (at left in diagram) have the following properties o Unit weight = 120 pcf o Cohesion = 0 o Angle of internal friction = 30 degrees Active (driving) earth or water pressure, lbs/ft Moment arm about tieback Moment about tieback anchor (ft) anchor (lbs-ft/ft) Σ driving moments = Passive (resisting) earth or water pressure, lbs/ft Moment arm about tieback anchor (ft) Moment about tieback anchor (lbs-ft/ft) Component P₁ P₂ P3 P4 Component Ps P6,min P6mm Is P6,mm P6,min?:
15.54 Tension Necessary in Tieback Anchor to Balance Driving Forces =_______ lbs Anchored Bulkhead Diagram WWW.WE 12.5 ft 7 ff DE Sand 4 ft. tieback anchor. 13 4 Sand 9.5 ft