Homework Answers
ANSWER:-----
SEEPAGE:--- Seepage is the continuous movement of water from the upstream face of the dam toward its downstream face. The upper surface of this stream of percolating water is known as the phreatic surface.
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Consider the figure of a dam shown below. The soil underneath the dam foundation has a...
Draw a flow netlfor the case of a long concrete dam shown in the Figure below...
Draw a flow netlfor the case of a long concrete dam shown in the Figure below and calculate the quantity of seepage underneath the dam. The soil underneath the dam is homogeneous and isotropic with a coefficient of permeability of 1.8 x 106 m/s. Determine the minimum weight of the dam required to maintain a factor of safety of 1.5 against the uplift of the dam. If the saturated unit weight of the soil is 18 KN/mP, check whether quicksand...
5 8 7 8 9 10 111 112 113 114 15 Q3b(i) Figure shows a flow...
5 8 7 8 9 10 111 112 113 114 15 Q3b(i) Figure shows a flow net beneath an impervious concrete dam. The permeability of the soil foundation is 1.4 x10-6 m/s. The head loss between upstream and downstream is 6.8m. The water height (H1) is 13.4m. Unit weight of water is 9.81 kN/m3 Upstream H1 11.5 m Downstream T 9.0 m 17.0 m; datum impermeable stratum Determine the quantity of seepage in m/day, if the dam is 4 m...
1- A long coffer dam is to be constructed to hold water as shown in the figure. The geometry of t...
1- A long coffer dam is to be constructed to hold water as shown in the figure. The geometry of the final wall is given. The total unit weight of the soil is 20kN/m . Draw the flow net for the steady state seepage flow which occurs under this wall. From the flow net determine: a) The height above point A to which water would rise in a piesometer tube. b) The flow under the wall per metre run of...
3. The flow net shown below illustrates flow conditions beneath a concrete dam featuring an upstream...
3. The flow net shown below illustrates flow conditions beneath a concrete dam featuring an upstream "clay blanket" (an impermeable clay layer) and a downstream "cutoff wall", both of which serve to lengthen the flow path. The coefficient of permeability, k, of the permeable strata is 8 x 10 cm/s. a. Calculate the flow rate, q, per day beneath the dam (per m of dam out-of-plane). b. Calculate the total head, elevation head, pressure head, and pore water pressure at...
4. An earth dam in Figure 3 composes of a uniform material. It has a horizontal...
4. An earth dam in Figure 3 composes of a uniform material. It has a horizontal drainage blanket at the base that extends from the downstream toe to a distance of 30 m. The embankment has a permeability of 2.0 x 10-6 m/s. The freeboard is 3.0 m. Draw the phreatic line and thus determine the seepage through the dam. 5. The specific weight of the dam shown in Figure 3 is 2.63, and the coefficient of friction between dam...
Problem (2) (12) For the concrete dam and soil profile shown in the Figure below, the...
Problem (2) (12) For the concrete dam and soil profile shown in the Figure below, the flow net is cons channel and 8 isted of 3 fNow rops, calculate: a) The rate of seepage under the dam in ft /sec/ft. b) Pore water pressure at points A, C, and D in Ib/ft. c) The uplift force in lb/ft at the base of the dam due to water pressure C use points C and D). 20
50 m Impermeable Concrete dam 6 m 1 m 10 m PtA (at mid-point of layer...
50 m Impermeable Concrete dam 6 m 1 m 10 m PtA (at mid-point of layer and centre of base) DATUM Impermeable bedrock Figure 2: Concrete dam (not to scale) Figure 2 shows the cross-section through a long concrete dam in anisotropic soil. The horizontal and vertical permeability of the soil are: K 25 x 10-4 cm/sec and Ky 1 x 10-cm/sec.. (a) Calculate the transform parameter a. In your exam booklet, draw the transformed flow domain to scale and...
*need the uplift force Problem 5 Consider the flow net shown below. The sandy soil has...
*need the uplift force
Problem 5 Consider the flow net shown below. The sandy soil has an average saturated unit weight of 20 kN/m and permeability of 0.002 cm/s. Numbers provided are elevations from the interface with the impervious layer. The other "set" of numbers counts the number of head drops. (a) Compute the distribution of pore water pressure acting along the base of the concrete weir, and determine the vertical uplift force that the water pressure exerts on the...
Q.1. (12 marks) State whether the followings are True or False? (1) The angle of internal...
Q.1. (12 marks) State whether the followings are True or False? (1) The angle of internal friction can vary from 0 to 90' since it is an angle. (2) A degree of saturation of 40% implies that 40% of the total volume consists of water. (3) Void ratio cannot be > 1. (4) If the coefficient of permeability is 10 cm/sec, the soil is likely to be silty sand (5) In the triaxial test the horizontal plane is the major...
PLEASE SOLVE FOR DAM SITE 4. POND TOP 15 m POND BOTTOM 5m 1 Th= h...
PLEASE SOLVE FOR DAM SITE
4.
POND TOP 15 m POND BOTTOM 5m 1 Th= h = 15m Rock 25m below pond bottom h = 3m 25 m h = 12m h = 9m h = 6m EXAM #2 (3-31-2020), SECTION 002 Students, Last Name Begins DAM SITE A TOC D TOL МТО Р O TOZ SOIL PERMEABILITY (Meters/Sec) 1 X 10 -(minus) 5 1 x 10- (minus) 3 4 X 10 - (minus) 6 7 X 10 -(minus) 5...
Draw a flow netlfor the case of a long concrete dam shown in the Figure below and calculate the quantity of seepage underneath the dam. The soil underneath the dam is homogeneous and isotropic with a coefficient of permeability of 1.8 x 106 m/s. Determine the minimum weight of the dam required to maintain a factor of safety of 1.5 against the uplift of the dam. If the saturated unit weight of the soil is 18 KN/mP, check whether quicksand...
5 8 7 8 9 10 111 112 113 114 15 Q3b(i) Figure shows a flow net beneath an impervious concrete dam. The permeability of the soil foundation is 1.4 x10-6 m/s. The head loss between upstream and downstream is 6.8m. The water height (H1) is 13.4m. Unit weight of water is 9.81 kN/m3 Upstream H1 11.5 m Downstream T 9.0 m 17.0 m; datum impermeable stratum Determine the quantity of seepage in m/day, if the dam is 4 m...
1- A long coffer dam is to be constructed to hold water as shown in the figure. The geometry of the final wall is given. The total unit weight of the soil is 20kN/m . Draw the flow net for the steady state seepage flow which occurs under this wall. From the flow net determine: a) The height above point A to which water would rise in a piesometer tube. b) The flow under the wall per metre run of...
3. The flow net shown below illustrates flow conditions beneath a concrete dam featuring an upstream "clay blanket" (an impermeable clay layer) and a downstream "cutoff wall", both of which serve to lengthen the flow path. The coefficient of permeability, k, of the permeable strata is 8 x 10 cm/s. a. Calculate the flow rate, q, per day beneath the dam (per m of dam out-of-plane). b. Calculate the total head, elevation head, pressure head, and pore water pressure at...
4. An earth dam in Figure 3 composes of a uniform material. It has a horizontal drainage blanket at the base that extends from the downstream toe to a distance of 30 m. The embankment has a permeability of 2.0 x 10-6 m/s. The freeboard is 3.0 m. Draw the phreatic line and thus determine the seepage through the dam. 5. The specific weight of the dam shown in Figure 3 is 2.63, and the coefficient of friction between dam...
Problem (2) (12) For the concrete dam and soil profile shown in the Figure below, the flow net is cons channel and 8 isted of 3 fNow rops, calculate: a) The rate of seepage under the dam in ft /sec/ft. b) Pore water pressure at points A, C, and D in Ib/ft. c) The uplift force in lb/ft at the base of the dam due to water pressure C use points C and D). 20
50 m Impermeable Concrete dam 6 m 1 m 10 m PtA (at mid-point of layer and centre of base) DATUM Impermeable bedrock Figure 2: Concrete dam (not to scale) Figure 2 shows the cross-section through a long concrete dam in anisotropic soil. The horizontal and vertical permeability of the soil are: K 25 x 10-4 cm/sec and Ky 1 x 10-cm/sec.. (a) Calculate the transform parameter a. In your exam booklet, draw the transformed flow domain to scale and...
*need the uplift force
Problem 5 Consider the flow net shown below. The sandy soil has an average saturated unit weight of 20 kN/m and permeability of 0.002 cm/s. Numbers provided are elevations from the interface with the impervious layer. The other "set" of numbers counts the number of head drops. (a) Compute the distribution of pore water pressure acting along the base of the concrete weir, and determine the vertical uplift force that the water pressure exerts on the...
Q.1. (12 marks) State whether the followings are True or False? (1) The angle of internal friction can vary from 0 to 90' since it is an angle. (2) A degree of saturation of 40% implies that 40% of the total volume consists of water. (3) Void ratio cannot be > 1. (4) If the coefficient of permeability is 10 cm/sec, the soil is likely to be silty sand (5) In the triaxial test the horizontal plane is the major...
PLEASE SOLVE FOR DAM SITE
4.
POND TOP 15 m POND BOTTOM 5m 1 Th= h = 15m Rock 25m below pond bottom h = 3m 25 m h = 12m h = 9m h = 6m EXAM #2 (3-31-2020), SECTION 002 Students, Last Name Begins DAM SITE A TOC D TOL МТО Р O TOZ SOIL PERMEABILITY (Meters/Sec) 1 X 10 -(minus) 5 1 x 10- (minus) 3 4 X 10 - (minus) 6 7 X 10 -(minus) 5...
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