A layer of sand extends from ground level to a depth of 9m and overlies a layer of clay, of very low permeability, 6m thick. The water table is 6m below the surface of the sand. The saturated unit weight of the sand is 19.5 kN/m³ and that of the clay 20 kN/m³; the unit weight of the sand above the water table is 17 kN/m³. Over a short period of time the water table rises by 3m and is expected to remain permanently at this new level. Determine the effective vertical stress at depths of 8 and 12m below ground level (a) immediately after the rise of the water table and (b) several years after the rise of the water table.. WT(2) SAND 3m WT(1) CLAY 12 m

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Chapter2: Geotechnical Properties Of Soil
Section: Chapter Questions
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A layer of sand extends from ground level to a depth of 9m and overlies a layer of clay, of
very low permeability, 6m thick. The water table is 6m below the surface of the sand. The saturated
unit weight of the sand is 19.5 kN/m³ and that of the clay 20 kN/m³; the unit weight of the sand above
the water table is 17 kN/m³. Over a short period of time the water table rises by 3m and is expected to
remain permanently at this new level. Determine the effective vertical stress at depths of 8 and 12m
below ground level (a) immediately after the rise of the water table and (b) several years after the rise
of the water table..
WT(2)
SAND 3m
WT(1)
CLAY
8 m
12 m
6m
Transcribed Image Text:A layer of sand extends from ground level to a depth of 9m and overlies a layer of clay, of very low permeability, 6m thick. The water table is 6m below the surface of the sand. The saturated unit weight of the sand is 19.5 kN/m³ and that of the clay 20 kN/m³; the unit weight of the sand above the water table is 17 kN/m³. Over a short period of time the water table rises by 3m and is expected to remain permanently at this new level. Determine the effective vertical stress at depths of 8 and 12m below ground level (a) immediately after the rise of the water table and (b) several years after the rise of the water table.. WT(2) SAND 3m WT(1) CLAY 8 m 12 m 6m
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