A clay layer, whose total settlement under a given loading is expected to be 11cm settles 3cm at the end of 1 month after the application of load increment. How many months will be required to reach a settlement of Scm? How much settlement will occur in 10 months? Assume the layer to have double drainage system. [7]

A clay layer, whose total settlement under a given loading is expected to be 11cm settles 3cm at the end of 1 month after the application of load increment. How many months will be required to reach a settlement of Scm? How much settlement will occur in 10 months? Assume the layer to have double drainage system. [7]

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter11: Ground Improvement

Section: Chapter Questions

Problem 11.8P

See similar textbooks

Similar questions

A deposit of cohesionless soil with a permeability of 0.3 mm/s has a depth of 12 m with impervious ledge below. A sheet pile wall is driven into this deposit to a depth of 8 m. The wall extendsabove the surface of the soil, and a 3 m depth of water acts on one side. Sketch the flow net and determine the seepage quantity. Provide a diagram a.600 ml/s/meter length b.300 ml/s/meter length c.900 ml/s/meter length d.1200 ml/s/meter length
Q- If a soil has a voids ratio of 0.68 and water percolating through it has a discharge velocity of 1.35*10-2cm/s. Calculate its seepage velocity.
The section size of a water pipe is (100cm Χ 100cm), three types of soils A, B, and C are placed in the pipe, and a fixed amount of water is injected into the top left tap to keep the water head difference between the left and right ends of the pipe 60cm. The three soil permeability coefficients are k_A = 0.05 cm/sec , K_B = 0.1 cm/sec, k_C = 0.001 cm/sec, please calculate the following values:(1) The fixed amount of water injected into the faucet on the upper left (cm3/hr)(2) What is the total water head consumed by each of the three soils of A, B, and C (cm)(3) The overall volumetric seepage force of water flowing through the three soils (kN/m3)
Refer to Figure 2. Embankments are generally constructed in several layers that are compacted according to geotechnical specifications.layers that are compacted according to geotechnical specifications. The thickness of eachof each layer is 3ft and should have a dry unit weight of 118 lb/ft3 .. It is known that theThe soil used in the embankment has a wet unit weight of 111 lb/ft3, moisture contentmoisture content of 23%, and Gs = 2.67. Complete the following tasks:(a) Determine the wet weight of the soil required to construct the first layer.(closest to the foundation soil) per foot (ft) of the embankment.b) On the day of construction there was a heavy rain that caused the soil used to reach a nearly saturated condition.used to reach a near saturated condition. Recalculate the wet weightwet weight of soil required to construct the first layer.
GEOTECHNICAL COMPLETE SOLUTION PLS For a falling-head permeability test, the following are given: length of specimen = 15.1 in., area of specimen = 3.9 in^2, and k = 0.0686 in./min. What should be the area in sq. in. of the standpipe for the head to drop from 25.1 to 12.6 in. in 8.9 min. ?
A concrete dam retains water to a height of 9 m. It has rows of sheet piling at both heeland toe which extend half way down to an impervious stratum. From a flow net sketchedon a transformed section, it is found that there are four flow channels and sixteen headdrops. The average horizontal and vertical permeabilities of the soil are 6 × 10^–3 mm/sand 2 × 10^–3 mm/s, respectively. What is the seepage in cubic meter per day, if the lengthof the dam is 150 meters?
The diagram of a sand drain is shown in Figures 16.21 and 16.22. Given: rw = 0.25 m, rs = 0.35 m, de = 4.5 m, Cv = Cvr = 0.3 m2/month, kh/ks = 2, and Hc = 9 m.Determine:a. The degree of consolidation for the clay layer caused only by the sand drains after six months of surcharge applicationb. The degree of consolidation for the clay layer that is caused by the combination of vertical drainage (drained on top and bottom) and radial drainage after six months of the application of surcharge. Assume that the surcharge is applied instantaneously.
Are flow nets to study subsurface flow appropriate only to coarse-grained soil with a high coefficient of permeability? Explain.
Calculate % Silt using the following values; a. Weight of soil= 50 g b. HR reading at 40 sec.= 25 c. Temp at 40 sec= 25 oCd. HR at 2 hrs= 16 e. Temp at 2 hrs= 26 * A. 17.28 B. 17.25 C 17.22 D. 17.19
A clay layer, whose total settlement under a given loading is expectedto be 13cm settles 3 cmat end of 1 months after application of load increment. How many months will be required to reach a settlement of 8cm? How much settlement will occur in 12months? Assume the layer to have double drainages
An oil tank is to be sited on a soft alluvial deposit of clay. Below the soft clay is athick layer of stiff clay. It was decided that a circular embankment, 10 m diameter,with wick drains inserted into the soft clay would be constructed to preconsolidateit. The height of the embankment is 6 m and the unit weight of the soil comprisingthe embankment is 18 kN/m3. The following data are available: thickness of softclay = 7 m, ks = 1 × 10−10 m/s and Ch = 0.6 m2/yr. The desired degree ofconsolidation is 90% in 12 months. Determine the spacing of a square grid of thewick drains. Assume wick drain of size 100 mm × 3 mm and qw = 0.1 × 10−6 m3/s.The flow point distance is 4 m. Assume a half-closed system.
For the first series of tests, no drainage of pore water occurs, either when the normal load is applied or during shearing (relating to clay’s very low coefficient of permeability). How does the “no drainage” control can be visualized?