Problem 3.5 • A layer of sand extends from ground level to a depth of 9 m and overlies a layer of clay, of very low permeability, 6 m thick. The water table is 6 m below the surface of the sand. |The saturated unit weight of the sand is 19 kN/m³ and that of the clay 20 kN/m³; the unit weight of the sand above the water table is 16 kN/m³. Over a short period of time the water table rises by 3 m, and is expected to remain permanently at this new level. Determine the effective vertical stress at depths of 8 and 12 m below ground level (a) immediately after the rise of the water table, and (b) several years after the rise of the water table.
Problem 3.5 • A layer of sand extends from ground level to a depth of 9 m and overlies a layer of clay, of very low permeability, 6 m thick. The water table is 6 m below the surface of the sand. |The saturated unit weight of the sand is 19 kN/m³ and that of the clay 20 kN/m³; the unit weight of the sand above the water table is 16 kN/m³. Over a short period of time the water table rises by 3 m, and is expected to remain permanently at this new level. Determine the effective vertical stress at depths of 8 and 12 m below ground level (a) immediately after the rise of the water table, and (b) several years after the rise of the water table.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Problem 3.5
• A layer of sand extends from ground level to a depth of 9 m
and overlies a layer of clay, of very low permeability, 6 m
thick. The water table is 6 m below the surface of the sand.
|The saturated unit weight of the sand is 19 kN/m³ and that of
the clay 20 kN/m³; the unit weight of the sand above the water
table is 16 kN/m³. Over a short period of time the water table
rises by 3 m, and is expected to remain permanently at this
new level. Determine the effective vertical stress at depths of 8
and 12 m below ground level (a) immediately after the rise of
the water table, and (b) several years after the rise of the water
table.
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