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WorksheetsGEOMECHANICS
Total questions: 30
Worksheet time: 15mins
Name
Class
Date
1.
If the volume of the soil decreases as a result of a change in effective stress, we have
a)
Positive vol. strain
b)
Negative vol. strain
c)
It depends on the geomaterial
2.
The effective stress can be computed by knowing…
a)
Total stress and pw
b)
Total stress, pw and bulk moduli
c)
It depends on the geomaterial
3.
When the total stress path (TSP) and effective stress path (ESP) can be parallel?
a)
If the process is drained
b)
Always
c)
Never
4.
Which is the main feature of an oedometer test?
a)
The horizontal stresses are zero
b)
The horizontal strains are prevented
c)
The volumetric strain is zero
5.
For drawing the effective stress path of an undrained process it is necessary
a)
To know the volumetric strain
b)
To measure or estimate pw
c)
To measure the axial displacements
6.
The general procedure for performing a triaxial test involves the following steps, in order:
a)
Saturation, isotropic consolidation and shearing
b)
Saturation, shearing and isotropic consolidation
c)
Shearing
7.
Performing a CTC test implies a total stress path during shearing with:
a)
Only change of axial stress
b)
Only change of radial stress
c)
Change of axial and radial stresses
8.
If the shearing phase of a saturated specimen is undrained we have
a)
Variation of void ratio and a constant pw
b)
Variation of pw and a constant void ratio
c)
Variation of pw and of void ratio
9.
For a NC soil the in-situ horiz. effective stress depends on
a)
Vertical total stress, pw and stress history
b)
Vertical effective stress
c)
Only the characteristics of the geomaterial
10.
For an OC soil the in-situ horiz. effective stress depends on
a)
Vertical total stress, pw and stress history
b)
Vertical effective stress
c)
Only the characteristics of the geomaterial
11.
The main feature of the K0 test is the need to have
a)
Axial strain equal to zero
b)
Axial stress equal to zero
c)
Radial strain equal to zero
12.
A matrix representation of a stress tensor has
a)
Normal stresses on the diagonal
b)
Shear stresses on the diagonal
c)
Only shear stresses
13.
Along principal planes
a)
Normal stresses are zero
b)
Shear stresses are zero
c)
All stresses are zero
14.
At the critical state the shearing, in drained or undrained conditions, can continue without change in
a)
Volume
b)
Volume and pw
c)
Radial strain
15.
Which is the preconsolidation pressure of a specimen characterized by an actual mean effective stress of 1000 kPa and an OCR of 5?
a)
5000 kPa
b)
200 kPa
c)
1005 kPa
16.
Which are the parameters that define the critical state line in the q- p '- υ space?
a)
M, λ, Γ
b)
M, λ, N
c)
M,N
17.
If the soil is NC, will the Critical State Line be reached with a dilating or contracting behaviour? What does it mean in terms of volume/induced pore water overpressure?
a)
Contracting, V decrease/positive deltapw
b)
Dilatant, V increase/negative deltapw
c)
Contracting, V increase/positive deltapw
18.
Does the Critical State Line depend on the stress history of the soil (NC or OC) or on the way in which the shearing is performed (drained or undrained)?
a)
No, the param. are intrinsic material parameters
b)
Yes, on the stress history
c)
Yes, on the way in which the test is performed
19.
The Critical State Line in the q-p 'plane corresponds to the Mohr Coulomb law characterized by the following parameters:
a)
c’peak, φ’cv
b)
c’peak, φ’peak
c)
φ’cv
20.
Modified Cam-Clay is based on which concepts?
a)
Elasto-plasticity
b)
Hardening
c)
Critical state
d)
All of the above
21.
Suction is defined as the difference between
a)
Pa and pw
b)
Total stress and pa
c)
Total stress and pw
22.
The air entry value
a)
Is higher for the largest pores size
b)
Is higher for the smallest pores size
c)
is not related to the pores size
23.
If the suction increases we observe
a)
reduction in volume
b)
increase in volume
c)
the volume doesn’t change
24.
The permeability of a soil depends on
a)
e, Sr
b)
only e
c)
only Sr
25.
The preconsolidation pressure with respect to s
a)
increases if s increases
b)
increases if s decreases
c)
is not affected by s
26.
The shear strength with respect to s
a)
increases if s increases
b)
increases if s decreases
c)
is not affected by s
27.
Considering a retained soil at the active state, the presence of suction will result in:
a)
An increase in the net stress
b)
A reduction of the lateral earth pressure
c)
A reduction of the effective stress
28.
Considering a vertical trench, the presence of suction will contribute to an increase of:
a)
The depth of the self-stable part
b)
The degree of saturation
c)
Lateral earth pressure
29.
If we pump water from an underground water table, the ground surface will experience:
a)
A settlement, due to the decrease in effective stress
b)
A heave, due to the increase in effective stress
c)
A settlement, due to the increase in effective stress
30.
Viscous deformation typically occurs:
a)
When pw varies due to pumping
b)
At constant load and water pressure
c)
when the total external load varies
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