3 A sample of soil was subjected to a series of triaxial tests. The results were as shown in the table. If a third test is made with a cell pressure of 250 kPa. Determine the value of the maximum principal stress (in kPa) for the third test.
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- 3 A sample of soil was subjected to a series of triaxial tests. The results were as shown in the table. If a third test is made with a cell pressure of 250 kPa. Determine the value of the maximum principal stress (in kPa) for the third test. 03 (kPa) 60 130 0₁ (kPa) 165 280 The value must be a numberA series of identical samples have been tested with drained triaxial test and some of the values are given in the tabulated table 3(Below). Calculate the remaining values as in the blank box. PARAMETER |cell pressure, o3 (kPa) total axial stress, 01 (kPa) pore pressure at failure, u¡ (kPa) |change in volume, Av effective cell pressure, o3' (kPa) effective total axial stress, o,' (kPa) |difference in stress, q (kPa) CD test 150 284 i 1.8 ii i iv O i = 134; ii = 16; iii = 150; iv = 0 O i = 134; ii = 284; iii = 150; iv = 0 O i = 0; ii = 16; iii = 150; iv = 134 O i = 0; ii = 150; iii = 284; iv = 134Table Q3(c) presentssamples information for point load test. Based on the data: (i) Calculate the Unconfined Compression Strength for sample A and B. (ii) Classify the strength of sample A and B based on Bieniawaski 1975 classification as given in Table Q3c(ii). (iii) As an engineer, define the reason of strength classification of sample A and B.
- Question 2 The result presented in Table Q2a were obtained from a consolidated drained (CD) triaxial test on a normally consolidated clay sample of 75mm height x 38mm diameter tested at a confining pressure of 50 kPa. Table Q2a. CD triaxial test result Axial strain (%) 1 2 5 10 15 Applied force (kN) 0.01 0.03 0.05 0.08 0.10 Page 3 of 6 (a) Draw the Mohr circle for each stress state in the sample and the total stress path (TSP) throughout the test and determine the slope of the TSP to the horizontal.Import your data for FREE Buy now c. An undisturbed soil sample, 110 mm in diameter and 220 mm in height, was tested in a triaxial machine. The sample sheared under an additional axial load of 3.35 kN with a vertical deformation of 21 mm. The failure plane was inclined at 50° to the horizontal and the cell pressure was 300 kN/m². Draw the Mohr circle diagram representing the above stress conditions, and from it determine: Coulomb's equation for the shear strength of the soil, in terms of total stress; the magnitude and obliquity of the resultant stress on the failure plane. ii. A further undisturbed sample of the soil was tested in a shear box under the same drainage conditions as used for the previous test. If the area of the box was 3600 mm² and the normal load was 500 N, what would you expect the failure stress to have been? Q Search IN 9 quickbooks N quickbooks in reports 9:52 an 29/04/202On close investigation of a sample it was found to be in three layers 20mm, 60mm, and 40mm. The permeability of these layers are 3x10-³mm/sec, 5x10-4mm/sec, and 17x10-4mm/sec respectively. Find kH kyi H, +kµz ·H, +kµ3 H; +…+ k, · H, H
- 3- Following are the results of a laboratory consolidation test on a sample of undisturbed clay obtained from the field. Final height of specimen (in) Pressure, o' (lb/ft') 1 0.9917 1,000 2,000 4,000 0.9843 0.956 0.9142 8,000 0.8685 16,000 0.8228 32.000 The height of the specimen at the beginning of the test was 1.0 inch, and the diameter was 2.5 inches. The moist specimen weighed 0.31 lb and the water content was determined to be 19%. Estimate the compression index and the preconsolidation pressure from the e-log o' curve. (Plot in Excel) Given: Gs = 2.7.The results obtained from a series of CU test on a soil gave the following results : CCU = C'CU = 0 cu 15°; 'cu = 30° CU A sample of this soil was tested in a CU test under a cell pressure of 150 kN/m². Determine (i) deviator stress at failure (ii) pore water pressure at failure (iii) minor principal effective stress at failure (iv) major principal effective stress at failure (v) the magnitude of Skempton's pore water pressure parameter(at failure) A# 3) A sand soil 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?
- 4.15 The following results were obtained from a liquid limit test on a clay using the Casagrande cup device. Number of blows 6 12 20 28 32 Water content (%) 52.5 47.1 43.2 38.6 37.0 (а) Determine the liquid limit of this clay. (b) If the natural water content is 38% and the plastic limit is 23%, calculate the liquidity index. (c) Do you expect a brittle type of failure for this soil? Justify your answer.d) An oedometer test was also performed on a (saturated) reconstituted sample obtained at the site. The initial void ratio was calculated as 1.005 and the initial sample height was 20 mm. The following measurements were reported for each of the 24-hr stress increments: Table 4. Oedometer test measurements Normal stress (kPa) 1.5 13 26 52 104 208 416 Change in sample height (mm) 0.419 0.199 0.229 0.209 0.208 0.199 Plot the evolution of the void ratio resulting from the data above using semi-logarithmic axes (i.e. produce an e-log o'y plot). Is there anything you can comment on the stress history and consolidation state of the soil?Q3. A 1200 g sample of Gravel in the SSD condition in air and weighed 770 g when immersed in water. Also, a 500 g sample of Sand in the SSD condition in air and weighed 300 g when immersed in water Calculate the BSG(SSD) of the sand and gravel 1) the BSG (SSD) of the Gravel * 1.2.791 2.4.71 3.3.703 4.2.50 2) the BSG (SSD) of the Sand * 1.2.221 2.3.590 3.2.500 4.3.232 Choose one answer and write the answer number for me