A 7 m thick layer of normally consolidated clay (Cc = 0.2, e₀ = 0.95) has an effective vertical stress of 110 kPa at its mid-depth. A wide fill raises the vertical stress in the clay by 30 kPa. Treat the layer as one sublayer with the stresses at its mid-depth. Find the primary consolidation settlement S in mm.
A 3.5 m thick layer of normally consolidated clay (Cc = 0.45, e₀ = 1.25) has an effective vertical stress of 95 kPa at its mid-depth. A wide fill raises the vertical stress in the clay by 135 kPa. Treat the layer as one sublayer with the stresses at its mid-depth. Find the primary consolidation settlement S in mm.
A 3.5 m thick overconsolidated clay layer has Cc = 0.25, Cr = 0.03 and e₀ = 0.75. At its mid-depth the effective vertical stress is 105 kPa and the preconsolidation pressure is 175 kPa. A new building adds 210 kPa of vertical stress at mid-depth. Find the primary consolidation settlement S in mm.
A 6 m thick overconsolidated clay layer has Cc = 0.45, Cr = 0.02 and e₀ = 1.2. At its mid-depth the effective vertical stress is 115 kPa and the overconsolidation ratio is OCR = 2. A new building adds 140 kPa of vertical stress at mid-depth. Find the primary consolidation settlement S in mm.
A clay layer 9.5 m thick has a coefficient of consolidation cv = 2 m²/year. It lies between two sand layers, so water drains out at the top and the bottom. For 70% average consolidation the time factor is Tv = 0.403. How many years t does the layer take to reach 70% consolidation?
In a laboratory oedometer test, a clay specimen 20 mm thick, drained at the top and bottom, reaches 50% consolidation in 4 min. In the field the same clay forms a layer 3.5 m thick. It lies on impervious rock, with sand above it, so water drains out only at the top. How many days t does the field layer take to reach 50% consolidation?
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