A 6.5 m thick layer of normally consolidated clay (Cc = 0.6, e₀ = 0.75) has an effective vertical stress of 135 kPa at its mid-depth. A wide fill raises the vertical stress in the clay by 40 kPa. Treat the layer as one sublayer with the stresses at its mid-depth. Find the primary consolidation settlement S in mm.
A 6 m thick layer of normally consolidated clay (Cc = 0.35, e₀ = 1.4) has an effective vertical stress of 90 kPa at its mid-depth. A wide fill raises the vertical stress in the clay by 25 kPa. Treat the layer as one sublayer with the stresses at its mid-depth. Find the primary consolidation settlement S in mm.
An 8 m thick overconsolidated clay layer has Cc = 0.2, Cr = 0.03 and e₀ = 0.8. At its mid-depth the effective vertical stress is 60 kPa and the preconsolidation pressure is 140 kPa. A new building adds 90 kPa of vertical stress at mid-depth. Find the primary consolidation settlement S in mm.
A 7.5 m thick overconsolidated clay layer has Cc = 0.4, Cr = 0.05 and e₀ = 1.1. At its mid-depth the effective vertical stress is 40 kPa and the overconsolidation ratio is OCR = 1.5. A new building adds 160 kPa of vertical stress at mid-depth. Find the primary consolidation settlement S in mm.
A clay layer 2 m thick has a coefficient of consolidation cv = 2 m²/year. It lies on impervious rock, with sand above it, so water drains out only at the top. For 80% average consolidation the time factor is Tv = 0.567. How many years t does the layer take to reach 80% consolidation?
In a laboratory oedometer test, a clay specimen 19 mm thick, drained at the top and bottom, reaches 50% consolidation in 4 min. In the field the same clay forms a layer 9.5 m thick. It lies between two sand layers, so water drains out at the top and the bottom. How many days t does the field layer take to reach 50% consolidation?
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