Soil Mechanics ll ' Name git/KM 501] February 28, 2013
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EXAM 1A
Problem 1 (20 points; ABET Outcome c: Course Outcome 1) 05c)! 35 ayq (05 79 ; '
An element of soil is subjected to a state of stress (kPa) associated with failure. The Mohr
SoilMechanicsII
CE/GeoE4301001
DIRECTSHEARANDTRIAXIALCOMPRESSIONTEST
Prepared By: Steven Allen Johnson
2/25/2013
Soil Mechanics II
Department of Civil Engineering
University of Minnesota
Minneapolis, Minnesota 55455
March 12, 2013
Developers Incorporated
CEGE 4301: Soil Mechanics II
Spring 2017
Homework #6
(due 22 Mar 17)
Problem 1
a. Consider a battered retaining wall with the failure plane at = 50 (Figure 1). The
backfill is sand, with = 18 kN/m3, = 34. The wall is rough, with the angle of friction
betw
CEGE 4301: Soil Mechanics II
Spring 2017
Homework #5
(due 8 Mar 16)
Problem 1
The geotechnical design of the reinforced concrete cantilever retaining wall for a 5.0 m
difference in elevation is shown. The backfill is sloping at 10; note the 1.5 m cover at
CEGE 4301: Soil Mechanics II
Spring 2017
Homework #1
due 1 Feb 2017
Problem 1
Various states of stress are shown in the figures (a-d); the units of stress are kPa. Following
Procedures I (analytical) and II (graphical), determine
i. principal stresses and
CEGE 4301: Soil Mechanics II
Spring 2017
Homework #2 (due 8 Feb 17)
Problem 1
A sand has an internal friction angle = 35. The initial stress state of an element of the sand, which is
not at failure, is given by xx = 120 kPa, yy = 50 kPa, xy = 20 kPa. Fail
CEGE 4301: Soil Mechanics II
Spring 2017
Homework #4
(due 22 Feb 17)
Problem 1
Given H = 4 m, = 18 kN/m3, = 35, determine the lateral force and its location.
a. Assume at-rest conditions and Ko = 1 - sin.
b. Assume active conditions according to the Ranki
CEGE 4301: Soil Mechanics II
Spring 2017
Homework #3
(due 15 Feb 17)
Problem 1
The data recorded during a direct shear test on a dry sand specimen, 100 x 100 x 25 mm, at a
constant normal force of 1200 N, are shown in the table. A positive normal displace
CEGE 4301: Soil Mechanics II
Spring 2017
Homework #9 (due April 24): Problems 1-4
Problem 1
The Pitkin County Highway Department needs to evaluate an existing steep slope along Drescher
Drive. A factor of safety of 1.3 is desired. The road runs along the
CEGE 4301: SOIL MECHANICS II
Spring 2017
Engineering report 3 Direct shear and triaxial compression tests
Names: _
Criteria
Weight (%)
Cover letter
10
Results
Direct shear test
Tables (e.g. experimental data)
Two figures (or one fig. with two curves):
(i)
Developers Incorporated
1130 Lake Shore Drive
Chicago, Illinois 60603
March 21, 2017
Soil Mechanics II
Civil, Environmental, and Geo- Engineering
University of Minnesota
Minneapolis, Minnesota 55455
Dear Soil Mechanic:
As stated in our February 8, 2017 le
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BuT THE COHESIOM OF THE SOIL. IS unmawm -W0 (mama mayhem, r557; A125
i
Y
! combucm, wrm THE FOLLOWING RESULTS.
g TEST 1;: COM FIN-N6 Peaswrzz = mu m, paw/mm 91:59 AT FAILulE =Z7
CEGE 4301: Soil Mechanics II
Fall 2015
Homework #9
(due 16 Dec 15)
Problem 1
A 3-foot-deep (Df=3ft) square foundation carries a gross load of 60000lb. Using a factor of safety
of 3, determine the size of the footing, that is the size of B. Use Terzaghi's
CEGE 4301: Soil Mechanics II
Fall 2015
Homework #5
(due 4 Nov 2015)
Problem 1
Determine the lateral stress distribution on both sides of the wall assuming active stress on the
right and passive stress on the left according to Rankine theory. All soils hav
CEGE 4301: Soil Mechanics II
Fall 2015
Homework #1
(due 09/23/2015)
Problem 1
The figures (a-d) show the stresses acting on an element; the units of stress are kPa. Following
Procedures I and II, determine
i. principal stresses
ii. directions of principal
Homework #2 Answers:
Problem 1
b)1 ~ 52 [kPa] 3 ~ 9 [kPa]
c) = 45 [deg]
d) 15 [kPa] 15 [kPa]
e) 30 [kPa] 15 [kPa]
Problem 2
All stress elements (a-e) represent points that plot on the mohr circle shown.
Problem 3
b) )1 138 [kPa] Stress vector oriented at
CEGE 4301: Soil Mechanics II
Fall 2015
Homework #3
(due 12 Oct 2015)
Problem 1
A cemented, clayey sand is known to have an angle of internal friction = 26, but the cohesion
of the soil is unknown. Two drained triaxial tests are conducted, with the followi
CEGE 4301: Soil Mechanics II
Fall 2015
Homework #2
(due 5 Oct 15)
Problem 1
The initial state of stress of a soil element is: xx = 30 kPa; yy= 60 kPa, xy = 15 kPa. The soil is
a dense sand with no cohesion and angle of internal friction = 45. The soil is
CEGE 4301: Soil Mechanics II
Fall 2015
Homework #4
(due 21 Oct 2015)
Problem 1
Consider a retaining wall and a sandy soil. Given H = 6 m, = 18 kN/m3, = 30, determine the
lateral force and its location.
a. Assume at-rest conditions and Ko = 1 - sin
b. Assu
Problem 5.1 For the general case of a strip footing resting on the surface of a saturated clay
with an undrained shear strength Cu, calculate the ultimate bearing capacity q:
Q
BK
./ /<'-\
ezawt
/(
\I (/y B
. /
\
Circuiarsiip surface
5.1.a Assuming a circ
CEGE 4301: Soil Mechanics II
Spring 2017
Writing Guidelines for Homework and Reports
Engineers communicate much of their work through writing. To help develop skills in
writing, the following guidelines should be followed. Note that up to 20% will be dedu
CEGE4301: Soil Mechanics II Spring 2017
Engineering Report IV Scoring
GOALS: (from the problem instructions)
Address the study of the five slope case studies. Present results of your work including tables showing
comparisons of the factor of safety (FS) r
CE/GeoE 4301: Soil Mechanics II
Spring 2011
Practice Problems 2
1 m wide
Problem 1
0
An old masonry gravity retaining wall is to be renovated because water
collects in the backfill to a level of 3 m from ground surface. The wall is
assumed to be rectangul
Case History: Dam Failure
Analysis of a case study: soil properties, shear strength, and slope stability
(from A Guide to Soil Mechanics by Malcolm Bolton, 1991, 4th printing)
1. The problem
Water supply in the plains of southeast Africa is a local affair
Developers Incorporated
1130 Lake Shore Drive
Chicago, Illinois 60603
February 8, 2017
Soil Mechanics II
Civil, Environmental, and Geo- Engineering
University of Minnesota
Minneapolis, Minnesota 55455
Dear Soil Mechanic:
My company is involved with the pr
CEGE 4301: SOIL MECHANICS II
Spring 2017
Grading Sheet Engineering Report 2
Undrained Shear Strength
Criteria
Weight (%)
Cover Letter
(format outlined in the guidelines for homework and reports)
15
Test Description
10
Results
- Material properties (Eu, u,
Homework #2 Answers:
Problem 1:
a) xy = 34 kPa
b) 175 deg
c) (i) xy = 29 kPa
(ii) xy = 40 kPa
d) 1 = 134 kPa Inclined at 22 deg from positive x-axis
= 36 kPa Inclined at 112 deg from positive x-axis
Problem 2:
a)32 deg
b)Fs = 225 N
Problem 3:
b)1 = 289 k