Said the Sky
Structural
Hello All,
looking for some engineering expertise on cantilever retaining wall with possible inclined backfill slope (still verifying with the architect that his drawings have a slope, most likely it does)
Question: how would you guys approach designing the two tier cantilever wall approach seen in my attached file. Would you design the higher cantilever wall as normal, and then add surcharge loading from the higher retaining wall, onto the lower one? If the higher one is sufficiently further away horizontally from the lower retaining wall, theoretically there would be no surcharge loading that would translate into additional horizontal forces on the lower retaining wall right and therefore can be designed as I normally would? If so what is the influence angle from the base of the higher wall to the lower wall, I've seen the numbers 2H:1V used quite often but I am unsure of where it comes from.
I also have a secondary issue, the retaining walls at the two sides of the home is quite tall (12'0" total height, retaining 8'0" of soil) is right by the property line so we cannot extend the footing under the soil to use the weight in the overturning calculations, so having issues just making everything work, wall probably has to be 10" thick with a footing about 7-8ft long, and if the soil is inclined the problem is further compounded.
TIA
looking for some engineering expertise on cantilever retaining wall with possible inclined backfill slope (still verifying with the architect that his drawings have a slope, most likely it does)
Question: how would you guys approach designing the two tier cantilever wall approach seen in my attached file. Would you design the higher cantilever wall as normal, and then add surcharge loading from the higher retaining wall, onto the lower one? If the higher one is sufficiently further away horizontally from the lower retaining wall, theoretically there would be no surcharge loading that would translate into additional horizontal forces on the lower retaining wall right and therefore can be designed as I normally would? If so what is the influence angle from the base of the higher wall to the lower wall, I've seen the numbers 2H:1V used quite often but I am unsure of where it comes from.
I also have a secondary issue, the retaining walls at the two sides of the home is quite tall (12'0" total height, retaining 8'0" of soil) is right by the property line so we cannot extend the footing under the soil to use the weight in the overturning calculations, so having issues just making everything work, wall probably has to be 10" thick with a footing about 7-8ft long, and if the soil is inclined the problem is further compounded.
TIA
