2. Sand at a given relative density has a friction angle of approximately 33° (relatively low stress). When the sample is unsaturated at a given value of saturation (not given to you), the specimen has a negative pore pressure of 5 kPa. How tall a sandcastle "vertical" wall can you construct? What would happen to your sandcastle if the level of saturation suddenly increased? (Assume a total unit weight of 18 kN/m³)

2. Sand at a given relative density has a friction angle of approximately 33° (relatively low stress). When the sample is unsaturated at a given value of saturation (not given to you), the specimen has a negative pore pressure of 5 kPa. How tall a sandcastle "vertical" wall can you construct? What would happen to your sandcastle if the level of saturation suddenly increased? (Assume a total unit weight of 18 kN/m³)

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter10: Stresses In A Soil Mass

Section: Chapter Questions

Problem 10.21P: Refer to Figure 10.48. If R = 4 m and hw = height of water = 5 m, determine the vertical stress...

See similar textbooks

Similar questions

Find the angle of internal friction for the sand specimen, if the deviator stress at failure is 100kPa, the cell pressure is 50kPa.if the sample is a dry sand specimen put through a triaxial test. A 30' в 15° C 45' D 37'
Question A dry sand specimen is put through a triaxial test. The cell pressure is 50 kPa and the deviator stress at failure is 100 kPa, the angle of internal friction for the sand specimen is
Refer to Figure 10.48. If R = 4 m and hw = height of water = 5 m, determine the vertical stress increases 2 m below the loaded area at radial distances where r = 0, 2, 4, 6, and 8 m. Circular contact area of radius R on the ground surface Figure 10.48
Consider the upward flow of water through a layer of kaolinite in a tank. The total thickness of the layer is 2.2m while the tank has a total depth of 3.0 m. The difference of the water levels between the outlet and the tube inserted at the bottom layer is 1.6 m. From soil testing results, liquidity index=0.90, liquid limit=20%, plastic limit is 10%. a.) compute the total stress 2 meters below the water level b.) compute the pressure head 2 m below the water level. c.) compute the pore water pressure 2 m below the water level e.) compute the effective stress at the bottom. f.) compute the hydraulic gradient. g.) compute the upward seepage force per unit volume per soil.
The polyethylene liner of a settling pond is subjected to stresses 0z = 2,100 kPa , oy = 300 kPa, and Try = -570 kPa, as shown by the plane-stress element in the first part of the figure. 300 kPa 26 2100 kPa 570 kPa Seam Determine the normal and shear stresses acting on a seam oriented at an angle of 26 to the element. (a) Determine the stress o - Round to the nearest whole number. kPa (b) Determine the stress Tg - Round to the nearest whole number. kPa (C) Determine the stress oy, Round to the nearest whole number. kPa
What is the equivalent constrained modulus in psf if the initial stress is 418 psf, the change in stress is 1204 psf, and the maximum past pressure is 418 psf? The initial void ratio is 1.29. The compression index is 0.26.
An onshore well is drilled on dry land with no water above the ground surface. An offshore well is drilled to the same TD/MD in the ocean but with 5000 feet of water. Comparing the overburden vertical stress of the land well to the overburden vertical stress of the offshore well, what is the effect of the water on the overburden vertical stress? a. The ocean does not affect overburden vertical stress b. The water depth will decrease the overburden vertical stress c. The water depth will increase the overburden vertical stress d. Not enough information is given to answer this question
Answer the ff: a) The total stress at the depth of 50 meters from the ground surface is b) The effective stress right above the depth of 20 meters from the ground surface is c)The effective stress at the depth of 50 meters from the ground surface is d) The neutral stress directly above the depth of 20 meters from the ground surface is: e) What is the void ratio of the fully saturated clay layer? f) What is the unit weight of the dry sand layer? g) What is the unit weight of the layer with capillary rise (moist clay)? h) The neutral stress at the depth of 50 meters from the ground surface is:
Triaxial tests performed on samples of aeolin sand. The failure conditions in terms of effective stress are (ov, 0h) = (515, 100), (1250, 200), (3500, 400), and (5325, 800) kPa. Using (s, t) space, determine the cohesion and friction angle. What is the orientation of the major principal stress with respect to the failure plane? Determine this graphically.
Can TRIAXIAL TESTS be performed on sand samples? Briefly explain. The results of an undrained triaxial test on a clay soil sample are given in table below Cell Pressure (kN/m2) 200 400 600 Additional Axial Load at Failure (N) 342 388 465 Each sample, originally 76mm long and 38mm in diameter, experienced a vertical deformation of 5.1mm. Evaluate the stress at failure for each cell pressure given in table above. Draw Mohr Circles and determine the shear strength parameters of the soil.
A square hollow bar having an outside dimension of 250 mm by 250 mm with 6 mm thick is to be replaced by a soild circular bar. a. Determine the required diameter of bar so that the maximum shear stress in the bar will not exceed the maximum shear stress in the tube. b. If the computed value of diameter in the previous question increase by 15%, what is the new shear stress of the circular bar? Determine the angle of twist in degrees of the tube if the length of the tube is 1m and the shear modulus is 80 GPa. Use T=14 kN-m.
A sample of dry sand is subjected to a tri- axial test. The angle of internal friction is 36.6°. The minor principal stress is 192 KPa. Compute the effective normal stress in KPa at the point where shear occurs at the failure plane.