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two isotropically consolidated undrained (ciu) triaxial tests, CU1 triaxial tests, CU1 and CU2, were conducted on a normally consolidated (Nc) clay under effective consolidation stresses of 100 and 200 kPa respectively. The undrained shear strength obtained from a DSS test on a sample taken from point A was 18 kpa. Poin A was 5m below the ground surface, as shown in FIGURE q2. An oedometer test was also carried out on the sample taken from Point A. From the test, the OCR, compression index and recompression index were determined as 4, 1.2 and 0.3 respectively. The ground water level (GWL) was the same as the ground surface
(a) calculate the Cu/ σv0 value at point A
(b)estimate the Cu value at point B which was 10 m below the ground surface and the OCR value at this point was 1.
(c)a 5m high sand fill with a unit weight of 20 kn/m3 was subsequently placed over a large extent on to the clay layer. estimate the Cu value at points A and B after the clay layer is fully consolidated, assuming the Cu/ σv0' ratio remains the same.
(d) discuss brefly how the undrained shear strength is affected by (i) the effective overburden stress and (ii) the OCR of soil.
The soil properties of the clay are Cc = 0.25, Cr = 0.05, gsat = 18 kN/m 3 , for the sand gsat = 18 kN/m 3 , and the water table is 2 m below the soil surface. Determine the settlements when a stress of 100 kPa is applied by the building over an a..
An Electrostatic Precipitator must treat 500,000 acfm with 99% efficiency. Assuming an effective drift velocity of 0.4 ft/sec, calculate the required plate area in ft^2, and the number of plates if each is 20 ft tall by 10 ft long, and there are 4..
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A dense sand has an effective friction angle of 43 and c'=0. A dry, 2.8-inch diameter sample is tested in drained triaxial shear with a confining pressure of 2500 psf. What axial load, P (in pounds), will be required to fail the sample?
Evaluate company performance in relation to GRI standards and comment on Stigler's theory.
The coefficient of static friction between the collar of mass m=2 kg and the bent bar is Us=0.35, and the collar is initially d=70 cm from the spin axis AB. Assuming the motion starts at t=0, determine the time at which the collar starts to to sli..
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A reservoir at elevation 700 ft will supply a second reservoir at elevation 460 ft. The reservoirs are connected by 1300 ft of 24-in cast-iron pipe and 2000 ft of 20-in cast iron pipe in series. What will be the discharge delivered from the upper ..
Calculate the undrained shear strength at a depth of 120 ft below the mudline. Calculate the undrained shear strength at a depth of 120 ft below the mudline if the soil has an OCR of 2.5 .
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