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A soil stratum has two layers a 4m-thick dry sand underlain by a 5m–thick saturated sand. Dry unit
weight and saturated unit weight of sand are respectively 16.21 KN/m3
and 20.88 KN/m3
.
a. What is the total stress at the bottom of the soil stratum?
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- Problem 1 A ground profile consists of 2 m of silty sand underlain by 3 m of clay. The ground water table is 3 m below the ground surface. The sand has a unit weight of 14 kN/m3. The clay has unit weight of 16 kN/m3 above the water table and 20 kN/m3 below the water table. a. Determine the total stress at bottom of the clay b. Determine the pore water pressure at the bottom of the clay c. Determine the effective stress at the bottom of the clay Problem 2 50 ft thick sand is underlain by 25 ft clay. The ground water table, initially at the ground surface, was lowered to a depth of 25 ft below the ground. After such lowering, the degree of saturation of the sand above water table was lowered to 20%. Saturated and dry unit weight of sand are 135 pcf and 116 pcf respectively. The saturated unit weight of clay is 120 pcf. a. What is the vertical effective pressure at the midheight of the clay layer before lowering of the water table in psf? b. What is the vertical effective pressure at the…a sand layer 9 meters highoverlies a clay layer that is 5 meters high. ground water table is at the onterface of sand and clay. the unit weight of sand is 17.47kN/m^3, saturated unit weight of clay is 19.84kN/m^3, void ratio of clay is 0.52, LL=43. Determine the settlement in mm of the consolidating layer for a stress increase of 54.76 kPa.A soil profile consists of a sand layer underlain by a clay layer, as shown. If the degree of saturation of the sand above water table was 50%. Saturated and dry unit weight of sand are 21.2 kN/m^3 and 18.22 kN/m^3 respectively. The saturated unit weight of clay is 18 kN/m3. Determine the total stress, pore pressure and effective stress at point A,B,C.
- A soil profile consists of sand (7-m thick) which overlies a layer of clay (9-m thick). Ground water table is located at the interface of the sand and clay. The effective stress at the bottom of the clay layer was determined. If the water table rises to the top of the ground surface, what is the change in the effective stress (in kPa) at the bottom of the clay layer? For sand layer: Void Ratio = 0.71, Specific gravity = 2.64, Degree of Saturation = 0.76 %3D %3D For clay layer: Void Ratio = 0.9, Specific gravity = 2.79 Round off to two decimal places.1.A layer of saturated clay 4m thick is overlain by sand 5m deep, the water table being 3m below the surface. The saturated unit weights of the clay and sand are 19 and 20 kN/cu.m., respectively. Above the water table, the dry unit weight of the sand is 17 kN/cu.m. 1.1 Find the total stress at the bottom of the clay layer 1.2 Find the pore water pressure at the bottom of the clay layer 1.3 Find the effective stress at the bottom of the clay laterProblem 6 From the soil profile shown, 4.6 m Ground water table Clay e = 0.9 3.6m Gs = 2.75 1. Compute the effective stress at the bottom of the clay. 2. If the water table rises to the top of the ground surface, what is the change in the effective stress at the bottom of the clay layer? 3. How many meters must the ground water table rise to decrease the effective stress by 14.4 kPa at the bottom of the clay? Ground surface Dry Sand e = 0.49 Gs = 2.68
- In a clayey sandy silt deposit, the water table is 3.5 m below the surface, but the sand to a height of 1.5 m above the water table is saturated by capillary water. The top 2 m of sand can be assumed to be dry. The saturated and dry unit weights of the soil are 19.5 kN/m^3 and 18.0 kN/m^3, respectively. Calculate the effective vertical stress at 8 m below the surface. Express answers in kPa rounded to the first decimal place.The arrangement of soil layers are as shown below. Lower layer of sand is under artesian pressure. If effective stress at top of clay layer is half of the effective stress at top of lower layer of sand, then amount by which piezometric head in lower layer of sand rises above water table is: 3 m Sand y= 17 kN/m 4 m y = 20 kN/m² [1m 6m Clay y= 21 kN/m' 4 m Sand y = 20 kN/mQuestion 20 A soil profile consists of sand (5-m thick) which overlies a layer of clay (9-m thick). Ground water table is located at the interface of the sand and clay. The effective stress at the bottom of the clay layer was determined. If the water table rises to the top of the ground surface, what is the change in the effective stress (in kPa) at the bottom of the clay layer? For sand layer: Void Ratio = 0.82, Specific gravity = 2.68, Degree of Saturation = 0.6 For clay layer: Void Ratio = 0.92, Specific gravity = 2.86 Round off to two decimal places.
- A soil profile consists of a sand layer underlain by a clay layer as shown. If the degree of saturation of the sand above water table was 50%. Saturated and dry unit weight of sand are 21.2 kN/m^3 and 18.22 kN/m^3 respectively. The saturated unit weight of clay is 18 kN/m3. 2m GWL Sand 2 m 1.5 m Clay 2 m 1) Determine the total stress at point C. 2) Determine the effective stress at point C. 3) Determine the effective stress at point B.Calculate the effective stress in kPa for a soil element at a depth of 5 m from the uniform deposit. The water table is 2 m below the ground. Above the water table the degree of saturation is 0.6 the moisture content is 30 % and below the water table the water content is 40% a.29.4 b.112.0 c.82.6 d.53.2A soil profile consists of sand (6-m thick) which overlies a layer of clay (5-m thick). The groundwater table is located at the interface of the sand and clay. The effective stress at the bottom of the clay layer was determined. If the water table rises to the top of the ground surface, what is the change in the effective stress (in kPa) at the bottom of the clay layer? For sand layer: Void Ratio = 0.72, Specific gravity = 2.61, Degree of Saturation = 0.6 For clay layer: Void Ratio = 0.99, Specific gravity = 2.72 Round off to two decimal places.
