276. Wall Dssign . - A wall section conforming to the previously 

 noted general design criteria and to the above is shoivn in Figure 95. 



;j! .ajs^^///,)^^, 



^5'—, 



7^^y7P^^^W!>^;^7!r^^7^!!^??!T;:^^!rr^^W^ 



20 



steel sheet pile cut-off wall 



FIGURE 95 - Cross section of concrete wall 



The weight of concrete in the wall, considering concrete to have a unit 

 vreight of 150 pounds per cubic foot, is 24,500 pounds per lineal foot. 

 The wall center of gravity determined by taking moment areas about A is 

 7.72 feet seaward of A. 



277. Stability Calculations. - Wall Overturning Landward . - Maximum 

 landward overturning moments would occur with maximum wave action on 

 the face of the wall and vfith the backfill unsaturated. Wave forces and 

 uplift would tend to cause -the vrall to overturn landward. (From Table 19 

 the design wave forces are those due to the 7-second period vrave.) The 

 overturning moment would be resisted by the moments due to the weight of 

 water over the toe of the seawall, the weight of the wall, active earth 

 pressure on the back of the wall, and the weight of earth on the back of 

 the wall. 



278. Yifave Forces and Moments. - Total wave forces and moments about 

 A are tabulated below. 



137 



