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MindTap Engineering for Das/Sobhan's Principles of Geotechnical Engineering, SI Edition, 9th Edition, [Instant Access], 2 terms (12 months)
9th Edition
ISBN: 9781305971264
Author: Braja M. Das; Khaled Sobhan
Publisher: Cengage Learning US
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Chapter 7, Problem 7.7P
To determine
Find the head difference across the specimen.
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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
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'
Chapter 7 Solutions
MindTap Engineering for Das/Sobhan's Principles of Geotechnical Engineering, SI Edition, 9th Edition, [Instant Access], 2 terms (12 months)
Ch. 7 - Prob. 7.1PCh. 7 - Prob. 7.2PCh. 7 - Prob. 7.3PCh. 7 - Prob. 7.4PCh. 7 - Prob. 7.5PCh. 7 - Prob. 7.6PCh. 7 - Prob. 7.7PCh. 7 - Prob. 7.8PCh. 7 - Prob. 7.9PCh. 7 - Prob. 7.10P
Ch. 7 - Prob. 7.11PCh. 7 - Prob. 7.12PCh. 7 - Prob. 7.13PCh. 7 - Prob. 7.14PCh. 7 - Prob. 7.15PCh. 7 - Prob. 7.16PCh. 7 - Prob. 7.17PCh. 7 - Prob. 7.18PCh. 7 - Prob. 7.19PCh. 7 - Prob. 7.20PCh. 7 - Prob. 7.21PCh. 7 - Refer to Figure 7.24. The following data were...Ch. 7 - Prob. 7.23PCh. 7 - Prob. 7.1CTP
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- Question 4.5 A rock sample has a length of 20.32 cm and a diameter of 5 cm. The pressure profile inside the core sample is given below, where nitrogen of viscosity 0.0178 cP is flowing at a constant rate of 55 cm³/s. What is the permeability of the sample if the flow is in accordance with Darcy's law? 450 400 350 - 300 250 - P [psig] 200 150 100 - 50 1 3. 4 7 8 9. Distance from inlet [in] 6arrow_forwardPROBLEM 1: A sample of sand, 5 cm in diameter and 15 cm long, was prepared at a porosity of 60% in a constant-head apparatus. The total head was kept constant at 30 cm and the amount of water collected in 5 seconds was 40 cm?. The test temperature was 20°C. the Calculate coefficient of permeability? a. 0.261 cm/s b. 0.960 cm/s c. 0.204 cm/s d. 0.178 cm/sarrow_forwardA triaxial sample was subjected to an ambient pressure of 200 kN/m2 and the pore pressure recorded was 50 kN/m2. In this state, the sample was found to be partially saturated. Then the cell pressure was raised to 300 kN/m². The value of pore water pressure will be kPa. ---- ▬- (Take B= 0.8) %3Darrow_forward
- 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)arrow_forwardIn a triaxial test, total increament in cell pressure and total increament in deviator stress are 350 KN/m² and 500 KN/m² respectively. The pore pressure coefficient A & B are 0.4 and 0.9 respectively. Find total change in pore pressure.arrow_forwardA limestone core sample is saturated 100% with water. Calculate the absolute permeability of the core sample if the water is flowing at 4.15 cubic centimetres per second. The length of the core sample is 13.61 centimetres and its diameters if 7.13 centimetres. The pressure differential across the core sample is 25 atmospheric pressure and the water viscosity is 1.1 centipoises. Explain a method of how the permeability of this reservoir can be improved.arrow_forward
- On 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, Harrow_forwardExample 4.3 The following compression readings were taken during an oedometer test on a saturated clay specimen (G,=D2.73) when the applied pressure was increased from 214 to 429 kPa: TABLE G 1 Time (min) 1 4 9. 16 25 4 Gauge (mm) Time (min) 5.00 4.67 4.62 4.53 4.41 4.28 4.01 3.75 3.49 36 49 64 81 100 200 400 1440 Gauge (mm) 3.28 3.15 3.06 3.00 2.96 2.84 2.76 2.61 After 1440nmin, the thickness of the specimen was 13.60mm and the water content was 35.9%. Determine the coefficient of consolidation from both the log time and the root time methods and the values of the three compression ratios. Determine also the value of the coefficient of permeability.arrow_forward4. Given the following data: the porosity obtained from this method is the effective porosity,. Weight of the clean dried core sample in air: Wtdry = 20.0 gm Weight of the core sample saturated with water: Wtsat = 22.5 gm . Density of water: pw = 1.09m CC what is the pore volume of the sample?arrow_forward
- 7.7 In a constant-head permeability test, the length of the specimen is 200 mm and the cross sectional area is 78.5 cm². If k = 2.1 x 10-2 cm/sec, and a rate of flow of 130 cm³/min has to be maintained during the test, what should be the head difference across the specimen?arrow_forwardA CD test was conducted on a sample of dense sand 37 mm in diameter × 77 mm long. The cell pressure was 200 kPa. The results are shown in the table below. Axial displacement (mm) 0 0.3 0.6 1.0 1.3 1.6 1.9 3.2 5.2 6.4 7.1 9.7 12.9 15.5 Axial load (N) 0 128.1 225.9 338.9 451.8 508.3 564.8 604.3 593.0 576.0 564.8 525.2 497.0 480.0 (a) Using the data in the table, plot the Deviatoric stress (y-axis) against axial strain (x-axis) graph. (b) Using the graph from (a), draw the Mohr-circle at the peak (i.e., the maximum deviatoric stress). Determine the principal stresses as well. (c) Provided that the sample is sand, draw a failure envelope on the Mohr circle from (b) and determine the friction angle (p').arrow_forwardThe following readings were obtained from an oedometer test on a specimen of saturated clay, see Table 1. The load being held constant for 24 hour before the addition of the next increment. Applied stress 25 50 100 200 400 800 (kN/m2) Thickness 19.60 19.25 18.98 18.61 18.14 17.68 17.24 (mm) Table 1 At the end of the last load period the load was removed and the sample allowed to expand for 24 hour, at the end of which time its thickness was 17.92 mm and its water content found to be 31.8%. The specific gravity of the soil was 2.66. i. Plot the e/o' curve and determine the coefficient of volume compressibility (m,) for an effective stress range of 220-360 kN/m? ii. Plot the e/log ơ' curve and from it determine the compressibility index (Cc) and the pre-consolidation pressure (Oʻpe) ii. Use the data obtained in (i), (ii) and (ii) to obtain and Plot a mlo' curve for the soil iv. compare the values for consolidation settlement for 4 m thick layer of the clay when the average effective…arrow_forward
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