A layer of saturated clay 5 m thick is overlain bysand 4.0 m deep. The water table is 3m belowthe top surface. The saturated unit weight of clayand sand are 18kN/m3 and 20KN/m3 respectively.Above the water table, the unit weight of sand is17KN/m3. Calculate the effective pressure on ahorizontal plane at a depth of 9 m below theground surface. What will be the increase in theeffective pressure at 9m if the soil gets saturatedby capillary, up to height of 1m above the watertable? Yw = 9.81KN/m3.

Answered: Image /qna-images/answer/dc8dc4a8-c4f9-40dc-a7da-22220c0b3da5.jpg

A layer of saturated clay 5 m thick is overlain by sand 4.0 m deep. The water table is 3m below the top surface. The saturated unit weight of clay and sand are 18KN/m3 and 20KN/m3 respectively. Above the water table, the unit weight of sand is Dmmi Colaulate the effective pressure on a

A layer of saturated clay 5 m thick is overlain by sand 4.0 m deep. The water table is 3m below the top surface. The saturated unit weight of clay and sand are 18KN/m3 and 20KN/m3 respectively. Above the water table, the unit weight of sand is Dmmi Colaulate the effective pressure on a

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

See similar textbooks

Similar questions

2. The depth of water in a well is 3 m. Below the |IAVA bottom of the well lies a layer of sand 5 meters thick overlying of the clay deposit. The specific clay a gravity respectively 2.64 and 2.70. Their water contents are respectively 25 and 20 percent. Compute the total stress, effective stress and the pore water pressures at pointS solids of sand and are 3m A and B of the figure shown. Sand 5 m A• Ans: 88 kN/m², 29.1 kN/m², 58.9 kN/m² $2 m 12 m Clay
The soil profile consists of 5m sand underlain by 13 m layer of clay. The ground water table is at a depth 2.8 m below the surface. The sand has a unit weight of 19 kN per cu. Meter above the ground water table and the saturated unit weight below was 20 kN per cu. meter. The saturated unit weight of the clay is 15.7 kN per cu. meter. At a depth of 11 m determine the following:a. Total stressb. Pore water pressurec. Effective stress.....
A ground profile consists of 2.0 meters silty sand underlain by 3.0 meters of clay. The ground water table is 3.0 meters below the ground surface. The sand has a unit weight of 14 kN/cu.meter. The clay has a unit weight of 16 kN/cu.meter above the water table and 20 kN/cu.meter below the water table. Determine the total soil stress at the bottom of the clay layer.
Effective Stress in Soil Problem 1. The water table in a certain deposit of soil is at a depth of 2m below the ground surface. The soil consists of clay up to depth of 4m from the ground and below which lies sand. The clay soil is saturated even above the water table: Clay strata: ? = 30%,?? = 2.72 Sandy Strata: ? = 26%, ?? = 2.64 1. Compute the total pressure. 2. Compute the pore water pressure. 3. Compute the effective stress pressure at a depth of 8m below the ground surface
be the hydraulic conductivity at 20°C? Ans. 1.0 x 10 cm/sec 4. For a normally consolidated clay, the following values are given. k(cm/sec) 0.45 x 10 e 0.78 1.1 0.88 x 10 Estimate k at a void ratio of 0.97 6.0089 107
4- A 22 ft clay layer in the field (drained on one side) is normally consolidated. When the pressure is increased from 1,000 lb/f? to 3,000o 1b/ft?, the void ratio decreases from 0.9 to 0.75. The hydraulic conductivity, k, of the clay for the above loading range was found to be 2.4 x 10 in'sec. a) How long (in days) will it take for the clay layer to reach 50% consolidation? b) What is the settlement at that time (that is, at 50% consolidation)?
The profile at a site consists of 5m of sand overlying 10m of compressible clay, which in turn overlies a dense sand. The water table is at the top of the profile. The total unit weight of the top sand is 19kN/m3 and that of the clay is 18kN/m3. The Cv of the clay is estimated to be 5x 10-3 cm2/sec. Initially the clay is normally consolidated. It is planned to place a temporary fill that will exert a vertical load of 200kPa over the entire site. How long must the fill be in place so that, after it is removed, the maximum past pressure at every point in the clay is at least 50kPa larger than the vertical effective stress that existed before the fill was placed?
The ground water table in a deep deposit of sand is located at 4 m from the ground level. Due to capillary action, sand is saturated for a height of 1 m from the water table. The degree of saturation of the sand above the capillary fringe is 40%. If the specific gravity of solids and average void ratio of the sand are 2.68 and 0.72 respectively. Determine the effective stress (in kPa) at 4 m and 10 m from the ground level. Consider the standard value for unit weight of water.
Q4 The water table in a certain area is at a depth of 4 m below the ground surface. To a depth of 12 m, the soil consists of very fine sand having an average voids ratio of 0.7. Above the water table the sand has an average degree of saturation of 50%. Calculate the effective pressure on a horizontal plane at a depth 10 metres below the ground surface. What will be the increase in the effective pressure if the soil gets saturated by capillarity upto a height of 1 m above the water table? Assume G = 2.65.
A 39.4 ft thick layer of relatively impervious saturated clay lies over a gravel aquifer. Piezometer tubes introduced to the gravel layer show an artesian pressure condition with the water level standing in the tubes 9.8 ft above the top surface of the clay stratum. The properties of the clay are e = 1.2, G, = 2.7 and Ysat = 110.62lb/ft³ Determine (a) the effective stress at the top of the gravel stratum layer, and (b) the depth of excavation that can be made in the clay stratum without bottom heave. TIRSURS 39.4 ft Clay Gravel II TIRSURS TIRSURS Figure Ex. 5.12 49.2 ft TIRSURS
PROBLEM 1: A layer of sand 4.5m thick with specific gravity of 2.60, degree of saturation of 85%, and porosity of 41.18% with a 5 m thick of clay with specific gravity of 2.65 and a water content of 0.28. Ground water table is located at the interface of the two soils. Compute the depth below the ground surfac would the effetive stress be 100kPa. B. Compute the effective stress at a depth 8m below the ground surface. C. Compute the depth of excavation required to reduce the effective stress by 60 kPa
geotech. engineering A Thick layer of clay underlies a sand formation having a thickness of 4m. the groundwater is located 2m below the ground surface. The specific gravity of sand and clay is 2.65 with sand having an average void ratio of 0.52. the clay has a water content of 42%. Degree of saturation above the water table is 0.37. a. Compute the moist unit weight of the sand b. Total stress at a depth 10 m below the ground surface c. Effective stress at a depth of 10 m below the ground surface