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Preloading in struts in braced excavation helps eliminate the potential movement. The application of preload decreases the shear stress in soils established previously by excavation. As a result of stiffening of soils, the soil movement is declined accordingly.
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.
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