The soil profile at a site for a proposed office building consists of a layer of fine sand 10.4 m thick above a layer of soft normally consolidated clay 2 m think. Below the soft clay is a deposit of coarse sand. The groundwater table was observed at 3 m below ground level. The void ratio of the sand is 0.76 and the water content of the clay is 43%. The building will impose a vertical stress increase of 140 kPa at the middle of the clay layer. Assume the soil above the water table to be saturated, C=0.3 and Gs=27. 1. Calculate the vertical effective stress at the mid-depth of the clay layer. 2. Calculate the primary consolidation settlement. 3. If the settlement is limited to 100 mm, calculate the maximum vertical stress increase at the middle of the clay layer.
The soil profile at a site for a proposed office building consists of a layer of fine sand 10.4 m thick above a layer of soft normally consolidated clay 2 m think. Below the soft clay is a deposit of coarse sand. The groundwater table was observed at 3 m below ground level. The void ratio of the sand is 0.76 and the water content of the clay is 43%. The building will impose a vertical stress increase of 140 kPa at the middle of the clay layer. Assume the soil above the water table to be saturated, C=0.3 and Gs=27.
1. Calculate the vertical effective stress at the mid-depth of the clay layer.
2. Calculate the primary consolidation settlement.
3. If the settlement is limited to 100 mm, calculate the maximum vertical stress increase at the middle of the clay layer.
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