Prob 25.5

Prob 25.5 - CEE 452 FOUNDATIONS FALL 2005 Problem 25.5...

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CEE 452 FOUNDATIONS FALL 2005 Problem 25.5 Solution 1. Plot effective vertical effective stress versus depth on both sides of wall: 2. Plot active and passive stress versus depth (active stress on the right hand side, passive stress on the left hand side), using a factor of safety of 2 on the passive stress). Using Rankine theory (K A = [(1-sin ’)/(1+sin ’)] and K P = 1/K A ), K A =0.42 and K P /2 = 1.18 for ’ = 24 degrees. Note: The water pressure and pore pressure are ignored because they are the same on both sides of the wall. In practice, we would usually have a differential water pressure, with a lower water level outside the wall to account for tidal fluctuations and/or build-up (“mounding”) of ground water inside the wall. (See next page for plot) z 2.0 m 8.0 m D 36 kN / m 2 8.5 D kN /m 2 (87 + 8.5D) kN/m 2 87 kN/m 2 z
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CEE 452 FOUNDATIONS FALL 2009 Problem 25.5 Solutions Page 2 of 4 3. Convert stress to resultant forces and show moment arm around anchor (Point A): . P’ A , A p 3.0 m 1.67 m 5 + (2D/3) (P’ A ) 1 =15.2 kN / m (P’ P ) 4 = (5.05) D 2 kN /m (P’ A ) 3 = [(21.5 + 3.6D) (D+6) / 2] kN/m 3 + (2D/3) (D/2) + 2 m A p A (P’ A ) 2 =15.2 (D+6) kN/m A 2.0 m 8.0 m D 15.2 kN / m 2 (10.1) D kN /m 2 (36.7 + 3.6D) kN/m 2 2 P 1 3 4
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CEE 452 FOUNDATIONS FALL 2009 Problem 25.5 Solutions Page 3 of 4 4. Apply Moment Equilibrium around Point A (the anchor):
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This note was uploaded on 11/29/2010 for the course CEE 452 taught by Professor Zapata during the Spring '10 term at Arizona.

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Prob 25.5 - CEE 452 FOUNDATIONS FALL 2005 Problem 25.5...

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