Stress path diagrams for applications of increasing loading as illustrated in Figure 41 indicate that a clay soil shear strength will increase as consolidation progresses and pore water pressures...

Stress path diagrams for applications of increasing loading as illustrated in Figure 41 indicate that a clay soil shear strength will increase as consolidation progresses and pore water pressures dissipate (that is, the effective stress eventually equals the total stress). Excavation and related effects on clay soil represent a different condition, however. Referring to Figure 43, briefly describe in general terms what concerns exist relating to construction safety when excavations are undertaken in clay deposits.