Profile is shown in the figure A zone of capillary rise of 3.0m is on the sand layer overlaying clay. In this zone, the average degree of saturation is 70% 4m 3.0m 3.5m 8 Dry Sand 8 Capillary Zone CLAY Ground surface Ya 17.39KN/m³ e=0.5 Gs=2.71 Ground Water Table e=0.95 Gs=2.75 a.) Compute for the effective stress right below B. b.) Compute the effective stress of C c.) Compute the effective stress of D

Profile is shown in the figure A zone of capillary rise of 3.0m is on the sand layer overlaying clay. In this zone, the average degree of saturation is 70% 4m 3.0m 3.5m 8 Dry Sand 8 Capillary Zone CLAY Ground surface Ya 17.39KN/m³ e=0.5 Gs=2.71 Ground Water Table e=0.95 Gs=2.75 a.) Compute for the effective stress right below B. b.) Compute the effective stress of C c.) Compute the effective stress of D

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter7: Permeability

Section: Chapter Questions

Problem 7.2P

See similar textbooks

Similar questions

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.
A layer of silty soil of thickness 5 m lies below the ground surface at a particular site and below thesilt layer lies a clay stratum. The ground water table is at a depth of 4 m below the ground surface. The following data are available for both the silt and clay layers of soil. Silt layer: ?10= 0.018 mm, e= 0.7, and Gs = 2.7 Clay layer: e = 0.8 and Gs = 2.75 Required: (a) Height of capillary rise, (b) capillarypressure, (c) the effective pressure at theground surface, at groundwater table (GWT)level, at the bottom of the silt layerand at a depth of H =6 m below groundlevel, and (d) at a depth 2 m below ground level.(Sketch or draw the stress distribution diagram).
A course sand sample is placed in the constant permeameter test. Water passes through the sample water with a constant head of 40cm and after 0.00167hr, 40grams of water have been collected. What is the coefficient of permeability of the sand in cm/sec if the sample is placed inside a 166cm container with a 7.89cm radius?
4.A layer of saturated clay is 10 m thick, the lower boundary being impermeable;an embankment is to be constructed above the clay. Determine the time requiredfor 90% consolidation of the clay layer. If 300 mm diameter sand drains at 4 mcentres in a square pattern were installed in the clay, in what time would the sameoverall degree of consolidation be reached? The coefficients of consolidation inthe vertical and horizontal directions, respectively, are 9.6 and 14.0 m^2/year.
The sand layer shown is 2.5m thick. Beneath the sand layer is a 1.8m thick clay layer, underneath the clay layer is a solid rock. Water table is at depth of 0.9 m below the ground surface. SAND: Ymoist= 23KN/m3 ; Ysat= 21KN/m3 CLAY: Ysat= 23 KN/m3 ; LL= 42% e=0.7 A.) Compute the overburden pressure at mid-clay layer. B.) Find the maximum surface pressure without exceeding a 139.5mm settlement in clay layer if it is assumed to be normally consolidated. C.) If surface pressure is 70kpa and pre-consolidation pressure is 80kpa, find the settlement in clay layer.
A dense silt layer has the following properties: Void ratio = 0.76, SG= 2.59. Free ground water is 9.31m below the ground. Capillary action rise will reach 7.93m. The soil above capillary action rise is dry while within the zone, it is saturated at 53.13%. Determine the effective pressure (kPa) at a depth of 7.05m from the groind surface. Use stored value. Asnwer in 5 decimal places.
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?
Given data: Depth of Clay layer =4Depth of Sand layer=2unit weight of clay kN/m3=23unit weight of sand kN/m3 =21Ø in both layers=30C´= 0
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. a. 600 ml/s/meter length b. 300 ml/s/meter length c. 1200 ml/s/meter length d. 900 ml/s/meter length
A clay layer 5 m thick has double drainage. It was consolidated under a load of 127.5 kN/m2. The load is increased to 197.5 kN/m2. The coefficient of volume compressibility is 5.79 × 10^–4 m2/Kn and value of k = 1.6 × 10^–8 m/min. Find settlement in cm at 50% consolidation. a.25.78 b.10.32 c.32.56 d.20.27
An earthen channel in good condition carries a discharge of 10.0 cumecs with a m velocity of 0.7 m/s. determine the bed slope. Assume the bottom width as twice the depth. T Bazin's coefficient as 1:30 and side slope as (1.5/1)/(H ^ V) and B = 2y n
In a constant head permeameter with cross section area of 10cm2 when the flow was taking placeunder a hydraulic gradient of 0.5. the amount of water collected in 60seconds is 600cc.find thepermeability of soil..