Exercícios Permeabilidade e Percolação - Mecsolos 2 - Soil Mechanics lambe

From the flow net determine a rate of flow b pore pressure at elevation 6 and c the exit gradient 182 Draw the flow net on both natural and transformed sections for the refinery subsoil profile in Fig P183 for the case of steady seepage under pumping Refer to Example 162 for soil properties 183 For the sheet pile wall in Example 181 make a scaled plot of vertical effective stress on the horizontal surface axis The total unit weight of soil is 110 lbft³ and geostatic stresses exist 184 Isolate figure X in Example 182 and plot on it the boundary water pressures 185 Draw the flow net in Example 185 to natural scale if kₐ 5 10⁶sec and kᵤ 10⁵sec 186 Steadystate twodimensional flow is occurring into the double row of sheet piles shown in Fig P186 Draw the flow net and compute the rate of flow per meter of wall length Determine the maximum exit gradient and the factor of safety against liquefaction Plot to scale the water pressure along the both sides of one of the sheet pile walls 187 Compute the seepage in cubic feet per day per foot of dam length through the dam of Fig P187 For the Point B determine the pore pressure and gradient where μg D pipe diameter γw unit weight of water μ viscosity of water g acceleration of gravity PROBLEMS 171 For the flow situation shown in Fig 179 compute the vertical effective stress in the sand at elevation 4 ft G 260 and S 100 172 In a certain sand deposit the water table is at the ground surface Compute the total stress pore pressure and effective stress on a horizontal plane at a depth of 15 ft for each of the following cases a Static ground water b Upward flow under a gradient of ½ Make and list reasonable assumptions for any data needed 173 A jar 100 cm high and 10 cm² in crosssectional area is filled with soil and water having an overall average unit weight of 1077 gcm³ The specific gravity of the soil is 280 For each of the following three cases compute σv μ and δv at the bottom of the jar a Uniform slurry b Sediment of soil 5 cm thick and sea water γw 1026 gcm³ c Sediment of soil 6 cm thick and pure water γw 1000 gcm³ For cases b and c compute the void ratio of the sediments 174 For the setup shown in Fig P174 plot to scale elevation head pressure head total head and seepage velocity versus distance along the sample axis 175 For the setup shown in Fig P175 compute the vertical force exerted by the soil on screen A and that on screen B Neglect friction between the soil and tube G 275 176 In the profile shown in Fig P176 steady vertical seepage is occurring Make a scaled plot of elevation versus pressure head pore pressure seepage velocity and vertical effective stress Determine the seepage force on a 1 ft cube whose center is at elevation 15 ft G for all soils 275