Compute the effective pressure at a depth of 10m below the bottom of a lake 6m deep. The bottom of the lake consists of soft clay with a thickness of more than 12m. The average water content for the clay is 45% and the specific gravity of soil is 2.65. Assume the lake is filled up with water upto the top.

Compute the effective pressure at a depth of 10m below the bottom of a lake 6m deep. The bottom of the lake consists of soft clay with a thickness of more than 12m. The average water content for the clay is 45% and the specific gravity of soil is 2.65. Assume the lake is filled up with water upto the top.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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33
The water table is located at a depth of 4.0 m below the ground surface in a deposit of sand 16.0 m thick (Fig. 1). The sand is saturated above the water table. The total unit weight of the sand is 25 kN/m3. Calculate the (a) the total pressure, (b) the pore water pressure and (c) the effective pressure at depths 0, 4.0, 10.0, and 16.0 m from the ground surface, and draw the pressure distribution diagram.
A layer of saturated clay 5 m thick is overlain by sand 4.0 m deep. The water table is 3m below the top surface. The saturated unit weight of clay and sand are 18kN/m3 and 20KN/m3 respectively. Above the water table, the unit weight of sand is 17KN/m3. Calculate the effective pressure on a horizontal plane at a depth of 9 m below the ground surface. What will be the increase in the effective pressure at 9m if the soil gets saturated by capillary, up to height of 1m above the water table? Yw = 9.81KN/m3.
The dam shown has a base of which 2m below the ground surface. The pressure distribution diagram at the base of the dam can be obtained from the equipotential lines as follows: k=4.5 m/day. if H=6m determine the seepage through the foundation.
A sand layer of 3 m thick lies on a 3 m clay deposit. The water table is below 2 m of the ground surface. There is a 1 m capillary rise above the water table. Below the clay, there is a 2 m of a sand layer that lies on a bedrock. Piezometers installed at the bottom of the clay layer show an artesian pressure, the piezometric level being 1 m above the ground surface. The saturated and dry unit weight of the sand is 18 and 16 kN/m3, respectively. The saturated unit weight of the clay is 20 kN/m3. An embankment is going to be placed at the ground surface and will apply a 30 kPa uniform surcharge. Calculate and draw the total, pore pressure, and effective stress profiles for the following conditions.a) before the embankment is placedb) immediately after the embankment is placedc) long after the embankment is placed
A dense silt has the following properties: void ratio = 0.64, specific gravity = 2.5. Free ground water = 10.23m below the ground. Capillary action rise will reach 5.6m. The soil above the capillary action rise is dry while within the zone, it is saturated at 51.53%. Determine the effective pressure (in kPa) at a depth of 7.42m from the ground surface.
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A horizontal column of 100 cm length and 10 cm height is packed with a uniform soil with a saturated hydraulic conductivity of 4×10–5 cm/s. Then, the uppermost 1.0 cm is replaced with a soil with a saturated hydraulic conductivity of 2.2×10–7 cm/s. Therefore, the horizontal column has two horizontal layers. The pressure head is 20 cm at the left end (X = 0 cm; inflow boundary) of the column and 150 cm at the right end (X = 100 cm; outflow boundary). Flow is horizontal and steady state. For horizontal flow, the pressure head is the only driving force (gravitational head = 0). The volumetric water content of both soils is equal to the porosity and is 0.45 cm3/cm3. (A) Determine the effective saturated hydraulic conductivity of the layered soil column. (B) Calculate the Darcy’s flux through the layered soil column. (C) Calculate the Darcy’s flux in the top and bottom layers of the soil column.
A dense silt layer has the following properties: void ratio = 0.75, specific gravity = 2.59. Free ground water is 9.49 m. below the ground. Capillary action rise will reach 6.69 meters. The soil above capilary action rise is dry while within the zone, it is saturated at 50.02%. Determine the effective pressure (in kPa) at a depth of 7.51 meters from the ground surface. Round off to three decimal places. Selected Answer: 128.657
Question 32 A dense silt layer has the following properties: void ratio = 0.66, specific gravity = 2.5. Free ground water is 9.47 m. below the ground. Capillary action rise will reach 6.66 meters. The soil above capilary action rise is dry while within the zone, it is saturated at 52.77%. Determine the effective pressure (in kPa) at a depth of 7.42 meters from the ground surface. Round off to three decimal places.
3. Show that at saturation the water content is: 1 0 = Y, (- Y. Y Starting from Se = wGs