Using a deviator stress vs axial strain diagram, explain how the failure stress increases with cellpressure in a triaxial test.(i)Shear strength of a cohesive soil was determined in the laboratory using two samples. The firstsample failed at a shear stress of 83 kPa and an effective normal stress of 90 kPa. The secondsampled failed at 107 kPa and 135 kPa respectively. Determine the shear strength parameters(ii)of the soil.

Multiple questions in single pic...answering first question

Answered: Using a deviator stress vs axial strain…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Soil
The results below were obtained at failure in a series of consolidated-untrained triaxial tests, with pore water pressure measurement, on specimens of a fully saturated clay. Determine the values of the shear strength parameters c' and 'If a specimen of the same soil were consolidated under an all-round pressure of 300 kN/m² and the principal stress difference applied with the all-round pressure changed to 400kN/m², what would be the expected value of principal stress difference at failure" 150 300 450 600 03 (kN/m²) 01-03 (kN/m²) u (kN/m²) 103 202 305 410 82 169 252 331
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# 3) A sand soll sample is subjected to a direct shear test under a normal load of 185 kPa. The specimen failed when the shear stress reached 100 kPa. If the normal load is increased to 240 kPa, what will be the shear strength of the specimen?
A direct shear test is performed on a soil sample with two different loads. In the first test, a normal stress of 55kPa is applied and the soil fails at a shear stress of 35kPa. In the second test, the soil failed at shear stress of 47kPa when a normal stress of 75 kPa was applied. Determine the values of internal friction angle and cohesion of the given soil sample.
Two different soil samples were subjected to the shear strength test, of which, the first cohesive soil specimen failed at the deviator test of 500 kN/m2, when the cell pressure of 400 kN/m2 was recorded in the tri-axial shear apparatus. The second soil sample with the coefficient of internal friction 30° was subjected to direct shear test. The proving ring constant value is 0.0001 N/µm and the soil failed at the constant normal stress of 600 kN/m2, when the dial gauge reading was observed as 50. Take the area of soil sample at failure as 100 cm2. What is the ratio of cohesion of the soil specimen (1) to soil specimen (2).
Soil Mechanism
x 18 The effective shear strength equation (S = T₁ = 25+5 tam 30); expressed for a saturated clayey soil. In undrained test on a sample of the same soil using the shear box apparatus, the following data at failure were recorded :. Shear Stress = 90 kPa a) What and Normal stress = 180 kPa pore water pressure in the specimen at time of was the failure (assume Øu= 0). Find the Unconfined compressive strength (Od max) for the same soil an Unconfined. when tested in Compression test. c) Find the major principal stress when a sample of the same soil is tested in Ul test with confining pressure of (200 kPa).
(a) A sample of dry sand is tested in direct shear. Under an applied normal stress of 4,800 psf, the sample falls when the shear stress reaches 3,100 psf. What is the angle of internal friction for this soil?(b) A second sample of the same sand material is also to be tested in direct shear, but the applied compressive loading will be 3,500 psf instead of 4,800 psf. What shear stress is expected to fail the sample?
a) A CU triaxial test was carried out on a silty sand soil sample. The cell pressure was equal to 200 kPa. At failure the deviator stress was equal to 410 kPa and the pore pressure was equal to 73 kPa. i) Assuming that the cohesion intercept is equal to 0, calculate the friction angle of the soil. ii) If the friction angle was equal to 35°, calculate the cohesion intercept of the soil. iii) Calculate the angle of the failure plane relative to the horizontal plane for the soil shear strength parameters in Question 4 a i and 4 a ii.
In a consolidated undrained test with pore pressure measurement on a normally consolidated clay, a sample consolidated under a stress of 200 kPa failed at an additional axial stress of 150 kPa. The pore pressure at failure was 75 kPa. Determine analytically the shear strength parameters in terms of effective stresses.
A consolidated-undrained test was conducted on a normally consolidated clay sample. The results are as follows: Undrained angle of friction = 38.65°, Drained angle of friction = 62.59°, Deviator stress at failure = 509 lb/ft^2. Determine the pore water stress at failure in lb/ft^2.

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