Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 12, Problem 12.15P
To determine
Find the pressure meter modulus
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Example 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.
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Geotechnical Engineering-2
Chapter 12 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- Q3) You are in charge of drilling operations in a sedimentary basin. The figure bellow gives the setting. Prior to drilling you have performed a numerical analysis. The table below states the necessary information at the bottom of the shale layer and at the top of the sandstone layer. Assume hydrostatic pore pressure throughout the reservoir. Stress results from your numerical models at 2250m: To [MPa] Rock layer Sy [MPa] S [MPa] S, [MPa] [deg] So [MPa] Shale Sandstone 55.2 55.2 65 40 30 20 10 0.25 30 25 30 10 5 0.25 planned wellpath Shale thickness- 2250m Sandstone: thidkness 250m A. Your drilling crew on the rig wants to drill with a setting P-Po through the shale. Will you approve this and give permission? Prove your decision by calculating the necessary stresses and show a Mohr Circle construction so that the driller can understand your reason. If unsafe, which borehole failure mechanism do we expect? ; B. Should they increase, decrease P, or stay with P=Po? Why? C. Determine the…arrow_forwardQ: I an oedometer test on a specimen of saturated clay (Gs = 2.72), the applied pressure was increased from 107 1o 214 kPa and the following compression readings recorded: TaBLE| Tmen 0 025 05 1 225 4 &5 9 16 Guugelmm) 78 742 732 721 6% 678 &6 643 637 Teme(mi) 25 % 4 s om0 X0 a0 Guge(nm) 629 626 621 618 616 615 610 602 After 1440 min, the thickness of the specimen was 15.30 mm and the water content was 23.2%. Determine the values of the coefficient of consolidation and the compression atios from (a) the root time plot and (b) the log time plot. Determine also the values of the coefTicient of volume compressibility and the coefficient of permeability.arrow_forward(b) An oedometer test on a specimen of fully saturated stiff clay gave the following results in Table 1 for the pressure increment from 100 kN/m2 to 200 kN/m?. The initial thickness of the specimen under no pressure was 19 mm. Determine my, cy and k using Taylor's Method.arrow_forward
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