PROBLEM 3: A reservoir with a 3,400m? area is underlain by layers of stratified soils as depicted in the figure shown below. Compute coefficient of permeability in m/hour. a. 0.0385 m/hr C. 0.0145 m/hr the average vertical b. 0.0295 m/hr d. 0.0545 m/hr Water reservoir 15m k, = 5 cm/hr L= 4m k, = 2 cm/hr L2= 3m k, = 2.5 cm/hr L= 2 m k, = 3 cm/hr La 8 m IMPERMEABLE LAYER FIGURE 55-09(1)SO6
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- Given the ff: w=67% Gs=2.67 Gwet=19.89kN/m3. What is the degree of saturation?Soil k (mm/s) 0.10 300 тm B 0.03 0.0049 a.Compute the equivalent k in cm/s. A C b.Compute the rate of flow in cm³ /hr. 15 cm15 cm15 cm» Given: Cross-sectional area of the soils A, B and C is 100 mm x 100 mmRefer to Figure 7.24. The following data were collected during the field permeability measurement of a confined aquifer using a pumping test. Determine the hydraulic conductivity of the permeable layer. Use Eq. (7.49). Thickness of the aquifer, H = 4.5 m Piezometric level and radial distance of the first observation well: h1 = 2.9 m; r1 = 17.8 m Piezometric level and radial distance of the second observation well: h2 = 1.8 m; r2 = 8.1 m Rate of discharge from pumping, q = 0.5 m3/min
- Question 8 Find the flow rate in m'/sec/m length (at right angles to the cross section shown) through the permeable soil layer shown in Figure Q8 given H=8 m, H1=3 m, h-4 m, L=50 m, a-8°, k-0.08 cm/sec. Direction ఆf tow O Empervious layer Permeable layer Figure Q8. Name / ID number: Answer:5. Field capacity Field capacity may be defined by pressure threshold (= -340 cm) or by a threshold in specific discharge (q=0.1 mm/day). Use the Brooks and Corey equations (Tables 7.2 and 7.4 in Dingman) to estimate the field capacity (8) of the following media according to both definitions. Assume soils are mineral (0% organic carbon content). Complete your calculations for one example media on engineering paper using standard engineering format as given in the Problem Solving template. Enter all answers into the table below. Media Sand Silt loam Loam Clay Clay content (%) 5 15 20 65 8 when =-340 cm 8 when = 0.1 mm/day q=Earth is required to be excavated from the borrow pits for buildingembankment as shown in the figure. The moisture unit weight ofthe borrow pits is 18 kN/m3 and its water content is 8%. Estimatethe quantity of earth required to be excavated per meter length ofembankment. The dry unit weight required for the embankment is15 kN/m3 with a moisture content of 10%. Assume the specificgravity of the solids as 2.67. Also determine the degree ofsaturation of the embankment and volume of the water in theembankment
- A 500 m long levee made of compacted clay impoundswater in a reservoir as shown in attached Figure There is a 1 mthick (measured in the direction perpendicular to the seam)sand seam continuing along the entire length of the levee, at10° inclination to the horizontal, which connects the reservoirand the ditch. The hydraulic conductivity of the sand is2.6 X 10-3 cm/s. Determine the volume of water that flowsinto the ditch every day.here are the answer, only need solutions 1.f = 11.46 MPa 2.Mcr= 88.90 kN-m 3.fconc= 17.14 MPa; fsteel= 318.20 MPaThe dam and flow net shown in the attached picture. The dam is 120 m long and has two 10 m sheet piles driven partially into the granular soil layer. Datum is at tailwater elevation. Determine: 1. The quantity of seepage loss under the dam when k= 20*10^(-4) cm/s 12 m 10 m sheet pile 10m sheet pille 85m 30 m Impervious - O C 0.4 1 Scale: Number al equipotential drops
- A DrahmedsoilMechanicsnoteschapter5.pdf EMENT%20LURI/Downloads/DrahmedsoilMechanicsnoteschapter5.pdf of 62 Q 3.50 m 5.27 The dam shown in Figure is located on the anisotropic soil. The coefficients of permeability in the x and z directions are 5*107 and 1.8*10 m/s, respectively. Determine the quantity of seepage under the dam. Ans.: Nr = 3.25, Na = 12, q = 1.1 10 m/sec/m 15.00 m 1.00 m 3.00 m 8.00 m 33.00 m 8.00 m Soil Mechanics (177) Civil Eng. Dept, - College of Eng Assistant Prof. Dr. Ahmed Al-Obaidi 12:05 AM 4/12/2021 144 8. U. H. J. MIFigure below shows layers of soil in a tube that is 100mm x 100mm incross section. Water is supplied at a constant head difference of 400 mm across thesample. The hydraulic conductivities of the soils in the direction of flow through them areas follows. Soil k (cm/sec) Porosity, n (%) A 1x10-2 25 B 3x10-3 32 C 4.9x10-4 22 a. Calculate the equivalent k in cm/sec.b. Calculate the rate of water supply in cm^3/hrc. Calculate the seepage velocity through soil C in m/sec.Q- The seepage occurring through an earthen dam is represented by a flow net comprising of 10 equipotential drops and 20 flow channels. The coefficient of permeability of the soil is 3 mm/min and the head loss is 5 m. The rate of seepage (expressed in cm3/s per m length of the dam) through the earthen dam is