S1 • Stresses Changes Due to Surface Loads (Aerv) o Stresses within a soil mass will change as a result of surface loads. The change in total stress spreads and diminishes with distance from the load. Equations and charts are available to calculate both the vertical and horizontal stress change (6.0'. .. and 6.O'h). a If for some reason the complete total stress at a point is required, then add the geostatic stress, cr v or Oh, to the load-induced stress change, .6.0'. .. or 6.011_ a We are normally most interested in vertical stress increases due to surface compression loads. (As a rule, we assume that soil cannot withstand tension stresses.) o Often we need to know !1cr v to determine how much a structure will settle. (remember the CEG4011 consolidation test??) o To find Lia v must first define: a size and shape of building foundation a loads supported by building foundation a location of interest within soil mass a Most solutions are based on elasticity theory assuming a homogeneous, isotropic, elastic,
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