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The use of active and at-rest theory is not applicable in braced excavation. In essence, upper struts tend to be more heavily loaded while lower struts appear to be less loaded when compared with active pressure theory.
Peck then measured the bracing loads which were converted back to soil pressures. For example, the pressure envelope for non-cohesive soils is 0.65rHKa
H=height of excavation
Ka=active pressure coefficient
This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.