An unconsolidated undrained (UU) triaxial test was conducted on the intact soil specimen from part (a). The cell pressure was 2500 psf and the principal stress difference at failure was 900 psf. Calculate the undrained shear strength cu.
An unconsolidated undrained (UU) triaxial test was conducted on the intact soil specimen from part (a). The cell pressure was 2500 psf and the principal stress difference at failure was 900 psf. Calculate the undrained shear strength cu.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
Transcribed Image Text:A circular footing with a radius of r = 4.0 ft will be embedded D = 2 ft in uniform clay. The top
of the foundation is at the surface. The water table is at the ground surface.
An unconsolidated undrained (UU) triaxial test was conducted on the intact soil specimen from
part (a). The cell pressure was 2500 psf and the principal stress difference at failure was 900 psf.
Calculate the undrained shear strength cu.
Void Ratio
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
10
0.1
2
4
z/r, depth in radii
7
8
9
Cr= 0.07
100
1000
Effective Stress (psf)
Ovp' = 800psf
8.0
(9.0)
10.0
Cc = 0.3
0.2 0.3 0.4 0.6 0.81.0
5.0
(6.0
I, stress in percent of surface contact pressure
2
3 4 5 6 8 10
10000
3.0
2.5)
2.0
.25
20 30 40 50 60 80 100
1.0
(0.75
Note: Numbers on curves
indicate offset distances
in radii, x/r.
2r
0.5
0₂
KAB
X
IXq
100
q
0₂
10
FIGURE 4.10 Chart for calculating the increase in vertical stress beneath a uniformly loaded circular area.
(From NAVFAC DM-7.1, 1982, and Foster and Ahlvin, 1954; reproduced from Holtz and Kovacs, 1981.)
Expert Solution
Step 1
Data given
Cell pressure, = 2500 pcf
Principal stress difference at failure = 900 pcf
Find :
Undrained shear strength
Step by step
Solved in 2 steps
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Recommended textbooks for you
Structural Analysis (10th Edition)
Civil Engineering
ISBN:
9780134610672
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Principles of Foundation Engineering (MindTap Cou…
Civil Engineering
ISBN:
9781337705028
Author:
Braja M. Das, Nagaratnam Sivakugan
Publisher:
Cengage Learning
Structural Analysis (10th Edition)
Civil Engineering
ISBN:
9780134610672
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Principles of Foundation Engineering (MindTap Cou…
Civil Engineering
ISBN:
9781337705028
Author:
Braja M. Das, Nagaratnam Sivakugan
Publisher:
Cengage Learning
Fundamentals of Structural Analysis
Civil Engineering
ISBN:
9780073398006
Author:
Kenneth M. Leet Emeritus, Chia-Ming Uang, Joel Lanning
Publisher:
McGraw-Hill Education
Traffic and Highway Engineering
Civil Engineering
ISBN:
9781305156241
Author:
Garber, Nicholas J.
Publisher:
Cengage Learning