Note:hand written solution should be avoided. 1. On a site, the topmost soil layer consists of a 3m layer of clay. The clay layer overlies a 5 mlayer of sandy gravel, which in turn overlies impermeable rock. Draw up total stress, porepressure and effective stress profiles down to the bottom of the sandy gravel for thefollowing conditions: (yw = 9.81 kN/m³)Assume fully saturated capillary rise in clay above water table.(a) Water table at the ground surface;(b) Water table at the gravel/clay interface and the clay layer is fully saturated with capillaryrise water.(c) Comment on the results.Unit weights: sandy gravel = 21 kN/m³Clay 19 kN/m³

Approach to solving the question: Detailed explanation: Examples: Key…

Answered: 1. On a site, the topmost soil layer…

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter9: Consolidation

Section: Chapter Questions

Problem 9.8P

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surface layer QY A Soil profile consists of a surface of Line sand 6m thick with unit weight of 16-5 kN/m³ and clay layer of 8m thick beneth the Sand layer. the water table is located at adepth of 4m below the ground surface: submergend for line Sand is 10.4 kN/m², Gs love clay layer is 2.7 & wc %. = 30% Calculate the eflective stress at the middle of clay Layer. + 6m 4M DW.T Fine Sand 8m clay 8=165& M2 sub = 1o.y tw G3=2=7 w;. = 30%.
A dense silt layer has the following properties: e =0.400 D10= 10.0 µm Capillary constant = 0.209 sq.cm Free ground water level is 8m below the ground surface. а. Find the height of capillary rise in the silt in meters. b. b. Find the vertical effective stress at 6m depth. Assume ys = 26.50 kN/m3 and the soil above capillary action rise and ground surface is partially saturated at 79%
A 6m thick layer of clay underlies a sand formation having a thickness of 4m. The ground water is located 2m below the ground surface. The specific gravity of sand and clay is 2.70 with sand having an average void ratio of 0.40. The clay has a water content of 20%. Determine the new height of ground water table from the bottom of the clay layer IF that the effective stress at the bottom of the clay layer has increased by 10 kPa.
Question 2 A sand layer is of 5m depth and under it clay layer of 5m depth. Ysaturated sand = 20 kN/m² and Ysaturated clay 19 kN/m2. The water table is at top of sand layer. If the water level drops by 3m but the zone above the water level is still saturated by capillary action then what is the effective stress at bottom of clay layer.
A soil profile shown has a zone of capillary rise in the sand overlying the clay. In average degree of saturation is 60% with a moist unit weight of this zone, the 17.6 kN/cu.m. a. Compute the effective stress inside the capillary zone at a depth of 3.0 m below the ground surface. Ground surface Dry Sand Ydry=16.50 kN/m³ 3m 3.9 m b. Compute the effective stress at a depth of 3.9 m below the ground. 6.9 m Sand B 0.9 m Y=17.6 kN/m Z water table Clay С. Compute the effective stress at C. Yrar=18,08 kN/m' 3m
A soil profile shown has a zone of capillary rise in the sand overlying the clay. In this zone, the average degree of saturation is 60% with a moist unit weight of 17.6 kN/cu.m.Compute the effective stress inside the capillary zone at a depth of 3.0 m below the ground surface. Compute the effective stress at a depth of 3.9 m below the ground. Compute the effective stress at C.
A dense silt layer has the following properties:Void ratio = 0.30Effecive diameter = 10umCapillary constant = 0.20 cm2Free ground water level is 8 m below the ground surface.a. Find the height of the capillary rise in the silt.b. Find the vertical effective stress in kPa at a depth of 5 m. Assume soil unit weight of 26.5 kN/m3 and that of soil above the capillary action rise and round surface is partially saturated at 50 %.c. Find the vertical effective stress in kPa at a depth of 10 m. Assume soil unit weight of 26.5 kN/m3 and that of soil above the capillary action rise and round surface is partially saturated at 50 %.......
A. Compute the effective stress at the bottom of the clay. B. If the water table rises to the level of the soil surface, what is the effective stress at the bottom of the clay? Fground surface Y-15.6 kN/m Yrar-16.6 KN/m3 4 m water table Clay 5 m:
Q2:- A layer of silty clay 6m thick has G=2.71 and n=0.65 is overlain by silty sand layer of 4m deep has G-2.68 and e=0.8. Calculate the effective stress for silty clay layer if water table 2: 4m below G.S 1: at G.S and
For the soil profile shown in Figure 3. Find the value of the vertical stress change at point A. when the water level increases from level b-b to level c-c. fig. (3) REY Sand 84:18-14 KN/² _W_C% = 11.0% XK 3-0m *c sat=21-35 16/17 sand b. clay 18544-20-35-3.0m A Rock 3.0m b
A soil profile, under surcharge load of 25 kN/m2 at ground level, consists of 6m sand and 3m clay layer. Ground water table is 2m below sand layer. Dry unit weight and saturated unit weight of sand is 15.80kN/m3 and 16.90kN/m3 respectively. Clay layer, Gs=2.67 and saturated unit weight is 18.80 kN/m3. Determine a)Increase in stress at the mid layer of clay b) With dewatering 2m, what is the stress increase at the mid layer of clay c) How much must the water level be lowered to me more effective than the surcharged load?
A uniform soil deposit has a dry unit weight of 15.6 kN/m³ and a saturated unit weight of 17.2 kN/m³. The groundwater table is at a distance of 4 m below the ground surface. Point A is at a depth of 6 m below the ground surface. If the water table rises by 3.5 m, determine the change in effective stress at A. Indicate if it is maintained, increased or decreased.

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