Reference no: EM132419541

Question 1

Figure 1 shows a concrete weir built on a deposit of sand overlying an impermeable soil layer. The permeability of the sand is 11.10^-4 m/s. Assuming the soil is isotropic and the unit weight of water is 9.81 kN/m³:

a) Draw the flow net on graph paper.

b) Calculate the flow rate under the weir.

c) Calculate the pore water pressure at point A shown in Figure 1.

Figure 1

Question 2

Table 3 below lists data obtained from consolidated undrained triaxial tests on soft clay.

Table 3

Tests	Cell pressure   (kPa)	Deviator stress at failure (kPa)	Pore water pressure at failure (kPa)
1	211	118	110
2	411	240	220
3	611	352	320

Assuming the unit weight of water is equal to 10 kN/m³:

a) Draw the Mohr circle of effective stress.

b) Determine the shear strength parameters in terms of effective stress.

c) Plot the critical state line and determine the critical state parameter M.