A borehole. A clay layer is discovered 7m below a sandy soil. The groundwater table of the area is 10m below the natural grade line. The sandy soil has a unit weight of the clay layer is 22.3 kn/m3 , and the moisture content and specific gravity is 12.4% and 2.7, respectively. A. Find the driend unit weight of the clay layer B. Find the total stress on a point 13m below the natural grade line. C. The effective stress at a point 10m below the grade line.

A borehole. A clay layer is discovered 7m below a sandy soil. The groundwater table of the area is 10m below the natural grade line. The sandy soil has a unit weight of the clay layer is 22.3 kn/m3 , and the moisture content and specific gravity is 12.4% and 2.7, respectively. A. Find the driend unit weight of the clay layer B. Find the total stress on a point 13m below the natural grade line. C. The effective stress at a point 10m below the grade line.

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter2: Geotechnical Properties Of Soil

Section: Chapter Questions

Problem 2.22P

See similar textbooks

Similar questions

Give the correct option In a drained triaxial test on consolidated clay the stress and angle are as follows: Deviator stress is 20 lb/in2 and friction angle is 21°. Calculate the effective confining pressure at failure?a) 21 lb/in2 b) 22.2 lb/in2 c) 25.4 lb/in 2 d) 17.9 lb/in2
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:
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.
In a drained triaxial test on consolidated clay the stress and angle are as follows: Deviator stress is 20 1b/in2 and friction angle is 210 . Calculate the effective confining pressure at failure.? A) 21 1b/in2 B) 22.2 1b/in2 C) 25.4 1b/in2 D) 17.9 1b/in2
A dilatometer test was conducted in a clay deposit. The groundwater table was locatedat a depth of 3 m below the surface. At a depth of 8 m below the surface, the contact pressure spod was 280 kN/m2 and the expansion stress sp1d was 350 kN/m2. Determinethe following:a. Coefficient of at-rest earth pressure, Kob. Overconsolidation ratio, OCRc. Modulus of elasticity, EsAssume s 9o at a depth of 8 m to be 95 kN/m2 and ms 5 0.35.
A Dry sand 6m Ydry = 16.5 kN/m³ B Groundwater table Saturated sand Ysat = 19.25 kN/m³ 13m Dry sand Saturated sand Clay Calculate the following: a. Effective stress at point A in kPa. b. Effective stress at point B in kPa. c. Effective stress at point C in kPa.
1.A dry sand is known to have an angle of internal friction of 29. A triaxial test is planned, where the confining pressure will be 41 kPa. What is the maximum axial stress, in kPa, (major principal stress) that can be applied? Calculate the value to 1 decimal place. Do not provide units in your answer. 2.A clay soil is subjected to a triaxial test under unconsolidated-undrained conditions. At failure, the major and minor principal stresses are 8401 psf and 4875 psf, respectively. What is the shear strength of this soil if the confining pressure is doubled? Provide your answer in psf with no decimals.
A consolidated drained tri-axial test was conducted on normally consolidated clay. The results were: the confining pressure is 300 kPa and the deviators stress is 300 kPa. Compute the angle that the failure plane makes with the major principal axis in degrees. show fbd a.16.3 b.24.72 c.54.74 d.19.47
A ground profile consists of 2m silty sand underlain by 3m of clay. The ground water table is 3m below the ground surface. The sand has a unit weight of 14kN/cum. The clay has a unit weight of 16kN/cum above the water table and 20kN/cum below the water table. Determine the Total stress at the surface of the water table (kPa). Determine the effective stress at the bottom of the clay layer (kPa). Determine the effective stress 1m from the bottom of the clay layer (kPa). Please answer this asap. For upvote. Thank you very much
sub: geotechnical engineering A soil layer consists of 4m upper layer of dry sand have a Gs= 2.64 and a void ratio of 0.53 and a lower layer is a clay having a void ratio of 1.0 and a specific gravity of 2.75. The effective stress at the bottom of the clay layer is equal to 93.46 kPa when the ground water is table is 4m below the ground surface. What is the thickness of the clay layer?
Problem 1 A ground profile consists of 2 m of silty sand underlain by 3 m of clay. The ground water table is 3 m below the ground surface. The sand has a unit weight of 14 kN/m3. The clay has unit weight of 16 kN/m3 above the water table and 20 kN/m3 below the water table. a. Determine the total stress at bottom of the clay b. Determine the pore water pressure at the bottom of the clay c. Determine the effective stress at the bottom of the clay Problem 2 50 ft thick sand is underlain by 25 ft clay. The ground water table, initially at the ground surface, was lowered to a depth of 25 ft below the ground. After such lowering, the degree of saturation of the sand above water table was lowered to 20%. Saturated and dry unit weight of sand are 135 pcf and 116 pcf respectively. The saturated unit weight of clay is 120 pcf. a. What is the vertical effective pressure at the midheight of the clay layer before lowering of the water table in psf? b. What is the vertical effective pressure at the…
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