TM 5-818-1 / AFM 88-3, Chap. 7
preconsolidation stresses. Curves designated Ku in
figure 3-7 are laboratory p-e curves. Soil disturbance
during sampling affects laboratory p-e curves so that it
pressure po, unloading to the estimated stress after
excavation pexc, and reloading the specimen to define the
U. S. Army Corps of Engineers
Figure 5-1. Vertical stress beneath a uniformly loaded rectangular area.