A cast-in-place (CIP) cantilever wall is required to maintain the grade for a freeway. A preliminary...

Question

A cast-in-place (CIP) cantilever wall is required to maintain the grade for a freeway. A preliminary wall dimension is shown in Figure P15.22. Determine the stability of the wall and show how you would provide adequate drainage. Use Rankine’s method to calculate the lateral forces. Neglect the passive resistance at the front of the wall.

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Solution 4
Example 15.22  
A cast-in-place (CIP) cantilever wall is required to maintain the grade for a freeway. A 
preliminary wall dimension is shown in Figure P15.22. Determine the stability of the wall 
and show how you would provide adequate drainage. Use Rankine’s method to calculate 
the lateral forces. Neglect the passive resistance at the front of the wall.
 
Solution 15.22
1 
3 
0.5m 
10° 
Granular backfill 
6m 
2 
Compacted sand 
1.4m 
0.7m 
0.8m 0.7m 3m 
In case of a wall with a vertical face; 
 
1  cos   cos2   cos2  '    cos10  cos2 10  cos2 28 
KaR   K 
 cos       cos10      0.38 
pR 
 cos   cos2    cos2  '   cos10  cos2 10  cos2 28 
   


K pR   
1 
KaR 
 
1 
0.38 
 
 2.63 

PaR 
Pax 
 
1 
(0.38)(18)(6  0.7  3 tan10)2   178.8 kN 
2 
 178.8 cos(10)  176.8kN
Paz     178.8sin(10)  31kN 
 
 

W1 
WS 
W3 
WS 
W2 
 
Table for weight calculation
Sr.

A cast-in-place (CIP) cantilever wall is required to maintain the grade for a freeway. A preliminary wall dimension is shown in Figure P15.22. Determine the stability of the wall and show how you...

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