Seepage takes place around a retaining wall shown in Figure P2.9. The hydraulic conductivity of the sand is 1.5 x 10-3 cm/s. The retaining wall is 50 m long. Determine the quantity of seepage across the entire wall per day. 5 m Retaining wall Sand Impervious stratum FIGURE P2.9
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- EXAMPLE 8.3 Seepage takes place around a retaining wall shown in Figure 8.8. The hydraulic con- ductivity of the sand is 1.5 × 10-3 cm/s. The retaining wall is 50 m long. Determine the quantity of seepage across the entire wall per day. FIGURE 8.8 5 m Retaining wall Impervious layer SandRefer to Figure P3.3. Use Eqs. (3.10) and (3.11) to determine the variation of OCR and preconsolidation pressure c. FIGURE P3.3A deposit of cohesionless soll with permeability of 3x10 cm/s has a depth of 10m with an impervious ledge below. A sheet ple wal is driven Into this deposit to a depth of 7.5 m. The wall extends above the surface of the soll and a 2.5 m depth of water acts on one side. Determine the seepage quantity per meter length of wal in cc/s. hx2.5 m 14 13 7.5 12 26m Oa. 2.50 b. 2.96 C. NOTC
- Determine the increase of pore water pressure at M due to the infinite strip loading shown in Figure Q3. Assume y= 0.5 and A-0.6. Im Clay 4m 2m 9-100kN/m² 4m Figure Q3 M G.W.T.(c) A dam shown in Figure Q1 (c) retains 6m of water. A sheet pile wall on the upstreamside (which is to reduce seepage under the dam) penetrates 4m into a 10m thick of siltysand stratum. Below the silty sand is a thick deposit of clay. Assume that the silty sandis homogeneous and isotropic. (i) Calculate q in cm/s.(ii) Analyze the pore water pressure distribution on the front of the sheet pile (atevery 2m @ at points A, F and G). Given the Nd of points A, F and G are 0.5,1.5 and 3.0 respectively.(iii) Analyze the pore water pressure distribution at the base of the dam. (at every5m @ at points A, B, C, D and E). Given the Nd of points A, B, C, D and E are5.6, 6.7, 8.0, 10.0, 13.0 respectively.(iv) Determine the uplift force under the dam.(v) Calculate the factor of safety against piping. Given Lmin = 0.85m.A permeability pumping test was carried out in a confined aquifer with the piezometric level before pumping of 2.18m below the ground surface. The aquiclude has a thickness of 5.7m measured from the ground surface and confined aquifer is 7.6m deep until it reaches the aquiclude at the bottom. At a steady state pumping rate of 15.6 ?7??6?3/?2h?7??1? the drawdown in the observation wells were respectively equal to 1.62m and 0.47m. The distances of the observation wells from the center of the test well were 15m and 32m respectively. The radius of the test well is 1m. Determine the coefficient of permeability (m/hr) Select the correct response: 2.15x10-5 0.215 0.597 5.97x10-5
- Problem 8 A permeability pumping test was carried out through a confined aquifer. The aquiclude (impermeable layer) above confined aquifer has a thickness of 6.8 m from the ground surface. The water table before pumping was 2.3 m below the ground surface. The well penetrates through a confined aquifer which is 5.8 m thick. Below the confined aquifer is a solid bedrock (aquiclude). At a steady pumping rate of 26.8 m³/hr, drawdowns on two observation wells located 15 m and 30 m from the main well are 1.4 m and 0.42 m, respectively. Determine the pumping rate in GPD. 169915 174563 154256 a. A. C. 166325 b. Determine the coefficient of permeability in m/day. A. 5.89 ن ن نے C. 4.25 C. B. D. A. C. 901.4 B. D. the Determine coefficient of transmissibility in liters per hr per vertical meter of the saturated aquifer. 1056.2 B. D. 3.24 3.73 ENGR. CHRYSLER G. DUASO, CE. RMP 854.7 963.4If the hydraulic conductivity of a sand at a void ratio of o.6 is o.03 cm/s, its value at the void ratio of o.75 will be O a. 0.03 O b. 0.05 O C. 0.07 O d. none of the above Hide Feedback Incorrect• A clay layer 22m thick drains on both top and bottom sides. The clay has a saturated density of 21kN/m³ , coefficient of consolidation of 1.8m?/yr and m, of 0.2MPa1. The clay carries a 280kPa load. Find the total pore water pressure at a point 5 meters below the top of the clay layer after 30% consolidation settlement.
- Seepage takes place around a retaining wall shown in Figure Q5. The coefficient of permeability of the sand is 3×10−3 cm/s. If the retaining wall is 20m long, calculate the quantity of seepage across the entire wall per day.A layer of sand 6 m thick lies beneath a clay stratum 5 m thick and above abed thick shale. In order to determine the permeability of sand, a well was driven to the top of the shale and water pumped out at a rate of 0.01m3/sec. Two observation wells driven through the clay at 15m and 30 m from the pumping well and water was found to rise to levels of 3m and 2.4 m below the ground water surface. Calculate the permeability of soil.A permeability pumping test was carried out in unconfined aquifer with the piezometric level before pumping is 2.18m below the ground surface. The first permeable layer has a thickness of 5.7m measured from the ground surface and the unconfined aquifer is 7.0m deep until reaches the aquiclude at the bottom. At a steady pumping rate of 15.6m^3/hr the drawdown in the observation wells were respectively equal to 1.62m and 0.47m. The distance of the observation wells from the center of the test well were 15m and 32m respectively. Compute the Transmissibility?