Question

A very wide embankment 5 m high is constructed from a fill with a unit weight of 16 kN/m3 over a saturated sand deposit with the presence of water table coinciding with its top surface. At a depth of 3 m below the top surface of the sand deposit, determine the following: (a) total and effective vertical stresses before construction of the embankment, (b) increase in vertical stress induced by the construction of the embankment, and (c) total and effective vertical stresses after construction of the embankment. Assume the saturated unit weight of the sand is 20 kN/m3.

Answer #1

A strip footing 2.5 m wide carries a uniform pressure of 248
kN/m² on the surface of a sand deposit. The water table is at the
surface, and saturated unit weight of sand of 20.8 kN/m³. Determine
the effective vertical stresses (kPa) at a point 3.8 m below the
point 3.2 m from the centre of the footing to the
LEFT after the application of the pressure. (2
d.p). Use unit weight of water 9.8 kN/m3

A highway embankment is constructed from soil having a final
compacted unit weight of 20.53 kN/m3 and a moisture content of
17.6%. The construction is undertaken by hauling soil from a nearby
borrow pit. The soil in the borrow pit has a natural unit weight of
16.29 kN/m3 and a moisture content of 13.2%. Assuming there is no
loss of moisture while carrying the soil from the pit to the
embankment location, the volume of soil to be excavated from...

3
A wide embankment 5m high is built on the ground described in
the previous example. The material of this bank has a moisture
content of 13% and a dry density of 1860kgm-3. Find the
vertical effective stress in the clay at a depth of 7.33m below the
original ground level.
4
A piezometer tip is set at 10m above datum into the top of a
confined layer of sand. The water level in the piezometer is 40m
above datum;...

A layer of sand extends from ground level to a depth of 9 m and
overlies a layer of clay, of very low permeability, 6 m thick. The
water table is 6 m below the surface of the sand. The saturated
unit weight of the sand is 19 kN/m3 and that of the clay 20 kN/m3;
the unit weight of the sand above the water table is 16 kN/m3. Over
a short period of time the water table rises by...

At a reclamation site, a 6-m thick sand layer overlies a 5.8-m
thick clay layer, which is underlain by impermeable rock stratum.
The water level is initially 2.5 m above the ground surface. The
saturated unit weights of sand and clay are 19 kN/m3 and 17 kN/m3,
respectively. A 5-m thick layer of fill will be placed on the
original ground surface, and the unit weights of fill are 19 kN/m3
and 20 kN/m3 above and below water table, respectively....

SITUATION 2: EFFECTIVE STRESS
An engineer investigates a granular soil deposit, 4 meters
thick, overlaying a 5 meter thick clay. The
water table is present between the interface of the granular soil
and the clay. The moist unit weight
of the sand is 15.6 kN/m3
, while the clay has a saturated unit weight of 17.8 kN/m3
a.) What is the vertical effective stress at the bottom of the
clay?
b.) If the water table rises to the level of...

Determine the total force per unit length acting on a 3.6 m high
retaining wall. The soil that is backfilled level behind the wall
is a granular soil with a total unit weight of 18.4
kN/m3 and a saturated unit weight of 19.5
kN/m3. The at-rest earth pressure coefficient for the
soil is 0.47. The water table is expected to raise to a depth of
2.5 below the ground surface. A surcharge of 59 kPa is applied
above the soil...

Determine the total force per unit length acting on a 4.8 m high
retaining wall. The soil that is backfilled level behind the wall
is a granular soil with a total unit weight of 18.2
kN/m3 and a saturated unit weight of 19.6
kN/m3. Use an at-rest earth pressure coefficient for the
soil which has an internal angle of friction of 26 degrees. The
water table is expected to rest at a depth of 1.5 below the ground
surface. Report...

A wall is supported on a 1.0 m wide strip footing located 1.5 m
below the ground surface. The surrounding soil has a dry unit
weight of 17.5 kN/m3, a saturated unit weight of 19.0 kN/m3,
cohesion of 8 kPa and angle of internal friction of 26°.
Groundwater was located 2m below ground surface. Using a factor of
safety of 3, determine the allowable bearing capacity if a) the
footing is considered infinitely long, and b) the footing is 8...

A soil with a unit weight of 20 kN/m3 is loaded on the ground
surface by a uniformly distributed load of 500 kN/m2 over a
circular area 4 m diameter (see Fig. below). Calculate the vertical
stress at depth 5 m below the center and edge of the circular
area.
Assume the Bousinesq conditions apply.
Assume the Westergaard conditions apply.
Sudject: Geotechnical Analysis
Please make numbers readable

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