(i) Draw the flow curve and obtain the liquid limit(ii) What is the plasticity index of the soil?(iii) Determine the liquidity index of the soil if the natural water content is 29.5%. A liquid limit test, conducted on the soil sample in the Casagrande cup device, gave thefollowing results:Number of blows, N Moisture content (%)52.51247.1(e)2043.22838.63237.0Two determinations for the plastic limit gave water contents of 22.8% and 23.2% for the firstand second trial respectively.(i) Draw the flow curve and obtain the liquid limit(ii) What is the plasticity index of the soil?(iii) Determine the liquidity index of the soil if the natural water content is 29.5%.

The liquid limit of a soil sample is defined as moisture content that corresponds to 25 blows.

A liquid limit test, conducted on the soil sample in the Casagrande cup device, gave the following results: Number of blows, N | Moisture content (%) | 6 52.5 12 47.1 (e) 20 43.2 28 38.6 32 37.0 Two determinations for the plastic limit gave water contents of 22.8% and 23.2% for the first and second trial respectively. (i) Draw the flow curve and obtain the liquid limit (ii) What is the plasticity index of the soil? (iii) Determine the liquidity index of the soil if the natural water content is 29.5%.

A liquid limit test, conducted on the soil sample in the Casagrande cup device, gave the following results: Number of blows, N | Moisture content (%) | 6 52.5 12 47.1 (e) 20 43.2 28 38.6 32 37.0 Two determinations for the plastic limit gave water contents of 22.8% and 23.2% for the first and second trial respectively. (i) Draw the flow curve and obtain the liquid limit (ii) What is the plasticity index of the soil? (iii) Determine the liquidity index of the soil if the natural water content is 29.5%.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A permeameter of 8.2cm diameter contains a sample of soil of lemgth 35cm. It can be used either for constant head or falling head tests. The standpipe used for the latter has a diameter of 2.5cm. In the constant head test the loss of head was 116cm measured on a length of 25cm when the rate of flow was 2.73ml/s. If a falling head test were then made on the same soil, how kuch time in seconds would be taken for the head to fall from 150 to 100cm?
The result of the liquid limit tests where N is the no of blows and w is the water content in % are given as follows: Trial 1 N=11 w=53.9; Trial 2 N=15 w=50.6; Trial 3 N=23 w=48.1; Trial 4 N= 30 w= 46; Trial 5 N= 46 w=43.3; Trial 6 N= 53 w=41. The PL= 25 and the in situ moisture content is 50%. Determine the liquidity index. a.0.91 b.1.25 c.0.56 d.0.59 With FBD if necessary
The result of the liquid limit tests where N is the no of blows and w is the water content in % are given as follows: Trial 1 N=11 w=53.9; Trial 2 N=15 w=50.6; Trial 3 N=23 w=48.1; Trial 4 N= 30 w= 46; Trial 5 N= 46 w=43.3; Trial 6 N= 53 w=41. The PL=25 and the in situ moisture content is 45%. Determine the liquid limit. O a. 41 O b. 47 O c. 43 O d. 50
49. A pumping test was made in a sand layer extending to a depth of 16m. The initial groundwater table was located 2m below the ground surface. Observation wells were sighted at distances 4m and 9.5m from the pumping well. Using a discharge of 0.4 cubic meters per hour, a steady level is attained at the pumping well. The measured drawdowns at the two observation wells are 2m and 0.25m respectively. Determine the coefficient of permeability of the soil.
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A pumping test was carried out in a soil bed of thickness 15 m and the following measurements were recorded. Rate of pumping was 10.6 x 10^-3 m3/s ; drawdowns in observation wells located at 15 m and 30 m from the center of the pumping well were 1.6 m and 1.4 m, respectively, from the initial groundwater level. The initial groundwater level was located at 1.9 m below ground level. Determine k in cm/s. a.2.6 x 10^-6 b.6.7 x 10^-1 c.3.47 x 10^-2 d.5.0 x 10^-2
In a constant head permeameter test, the length of the specimen is 200 mm and the cross-sectionalarea is 78.5 cm2. If k = 2.1 x 10-2cm/sec, and a rate of flow of 130 cm3/min must be maintainedduring the test, what should be the head difference across the specimen?
The discharge of water collected from a constant head permeameter in a period of 15 minutes is 500 ml. The internal diameter of the permeameter is 5 cm and the measured difference in head between two gauging points 15 cm vertically apart is 40 cm. Calculate (a) the coefficient of permeability (mm/s), (b) If the dry weight of the 15-cm long sample is 4.86 N and the specific gravity of the solids is 2.65, calculate the seepage velocity (mm/s).
The result of the liquid limit tests where N is the no of blows and w is the water content in % are given as follows: Trial 1 N=11 w=53.9; Trial 2 N=15 w=50.6; Trial 3 N=23 w=48.1; Trial 4 N= 30 w= 46; Trial 5 N= 46 w=43.3; Trial 6 N= 53 w=41. The PL= 25 and the in situ moisture content is 45%. Determine the liquid limit. a.41 b.43 c.50 d.47
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