What will be the ratio of average permeability in the horizontal direction to that in the vertical direction for a soil deposit consisting of three horizontal layers if the thickness and permeability of the second layer are twice those of the first and those of the third layer twice those of the second?

Q: What are the degree of consolidation of soil and the average degree of consolidation of soil layer

A: Consolidation: The compression of saturated soil under a steady static pressure is known as…

Q: Assume that the compressible soil shown in Figure 1 consists of a clay layer 10 ft thick. A…

A: Initial void ratio (eo) = 1.10Saturated Densityνsat =  115 lb/ft2Existing over burden pressure(po) =…

Q: A silty sand fill 4.5 meters thick and an estimated density of 20 kN/m³ is to be placed over 4.0 m…

A: Cv = 0.79 m2/yr = 20 kN/m3

Q: Find the void ratio if the value of porosity of soil is 32%

A: Given data :-   Porosity = 32 %  Then  Porosity = 0.32  Now  We have to find the value of the void…

Q: Outline the general relationship between soil particle sizes and size of void spaces between the…

A: The size of soil particle is directly proportional to the size of void spaces between the particles.…

Q: Determine the relative density of a cohesionless soil having void ratio 0.5. The void ratio of the…

A: Given: Void ratio of soil, e = 0.5 Void ratio of soil in loosest state, emax = 0.75 Void ratio of…

Q: A stratum of normally consolidated clay is 25 feet thick and the water content is 3. measured as 50%…

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Q: A site is underlain by a saturated clay layer with thickness = 5m. A sample extracted from the…

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Q: In order to determine the coefficient of permeability of a clay soil, which method is suitable,…

A: In order to determine the coefficient of permeability of clayey soil - Falling Head Permeability…

Q: If the coefficient of uniformity of a soil sample is close to 10, the soil’s gradation can be…

A: The coeff of uniformity  is given by Cu=D60D10 It is unity for the uniformly graded soil So the…

Q: The maximum and minimum unit weights of a granular soil are 117.1 lb/ft3 and 91.0 lb/ft3,…

A: What would be the relative density of the same sand compacted to a void ratio of 0.625

Q: A clay layer with two-way drainage reached 75% consolidationin t years. How long would it take for…

A: To find time required for the soil to consolidate 75%

Q: The figure below shows the soil profile at a site where you plan to lower the water table. You have…

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Q: A soil sample has the following size distribution; 4 to 2mm = 17%, 2 to 0.05 mm = 12%, 0.5 to…

A: Given data: Size Percentage 4 to 2mm 17% 2 to 0.05 mm 12% 0.05 to 0.005 mm 22% 0.005 to…

Field applications of hydraulic conductivity

Hydraulic conductivity is one of the hydraulic properties of soil defined as a measurement of the ability of a porous medium to permit water movement or fluid flow through it. It is denoted by the letter K. It is influenced by the density and viscosity of the fluid. It is also called permeability. Hydraulic conductivity is defined as the ratio of velocity to the hydraulic gradient. The different methods used to determine the hydraulic conductivity are laboratory methods (constant head permeability tests and falling head tests), in-situ field methods (pumping in and pumping out tests), small scale field tests (infiltration tests and slug tests), and indirect methods such as estimation from grain size, consolidation test data, and horizontal capillary test. The pedotransfer function (PTF) method is a specific empirical estimating approach employed in the soil sciences is also used to determine the hydraulic conductivity of the soil.