Wall from earth pressure surcharge load water earthquake etc.
Line load surcharge retaining wall sheet.
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Prior to completing any retaining wall design it is first necessary to calculate the forces acting on the wall.
Surcharge location is 0 feet from shoring retaining wall height of retaining wall shoring is 10 feet traffic surcharge 𝑞 𝛾 𝑃 𝐻𝑒𝑞 30 pcf given in this example x 3 5 ft from table 1 105 psf.
The live load surcharge is positioned to produce the maximum design load.
Loads and forces acting on retaining wall and their calculations the next step is to enter the loads on the wall as defined above.
Additional surcharge loads may be specified in the back side of the wall.
The wall could be a basement wall retaining wall earth support system such as sheet piling or soldier pile and lagging etc.
In this example the surcharge from a 10kn m line load located just outside the area of influence could contribute and extra 113 to the load on the shoring frame.
In this example even thought the surcharge load is the same relative to the size of the earth pressures it seems much less significant.
This surcharge shall apply as a rectangular distribution to the full height of shoring.
In figure 1 where a semi gravity wall is shown the live load surcharge is placed over any element of the ers for settlement and bearing analysis while the live load surcharge is placed behind all the elements of the ers for sliding and eccentricity analysis.
Four types of surcharge loads can be specified.
The earth pressure is acting.
Height to resultant hr line load surcharge resultant rl overturning moment from point load ml.
It can be either dead loads for example sloping backfill above the wall height or live load which could result from the highway or parking lot paving or adjacent footing.
However this isnt the case if the retaining wall is.
The stiffness of these elements can be modeled as linear elastic springs or fully nonlinear springs.
Retaining walls generally have little vertical load other than self weight and weight of any soil on a footing.
Area load point load line load and or strip load.
Retaining wall design example with surcharge load.
Surcharge load on plan surcharge 10 0 kn m2 applied vertical dead load on wall wdead 85 6 kn m applied vertical live load on wall wlive 3 8 kn m position of applied vertical load on wall.
