Presentation On Geology and Soil Mechanics: Submitted By-Titiksha Negi B.Tech (Ce) 4 SEM
Presentation On Geology and Soil Mechanics: Submitted By-Titiksha Negi B.Tech (Ce) 4 SEM
Presentation On Geology and Soil Mechanics: Submitted By-Titiksha Negi B.Tech (Ce) 4 SEM
SUBMITTED BY-
TITIKSHA NEGI
B.TECH(CE)
4th SEM
PERMEABILITY
Permeability is defined as the property of a porous
material which permits the water passing through its
interconnecting void.
SIGNIFICANCE OF PERMEABILITY:-
2. VOID RATIO :-
If particle size is same than loose soil are more permeable
than dense soil .
3. PARTICLE SHAPE :-
The effect of shape is expressed in terms of specific surface
area. Specific Surface is the ratio of surface area to unit
volume.
4. DEGREE OF SATURATION :-
If partially saturated degree of saturation is less than1,
hence presence of air voids create lock to flow.
5. STRUCTURE OF SOIL :-
In stratified soil permeability is greater than in the
direction of the bedding plane and perpendicular
to the bedding plane.
6. PROPERTIES OF WATER :-
Permeability is directly propotional to weight of
water.
1=W1V1
2=W1/V2
2 > 1
Objectives:
1.To increase soil shear strength
and therefore its bearing capacity.
2.To reduce subsequent settlement
under working loads.
3.To reduce
soil permeability making it more
difficult for water to flow through
REQUIREMENT OF SOIL
COMPACTION
Factors affecting compaction
Water content
Type of soil
Compactive effort
Method of compaction.
Permeability
The randomly oriented soil in the dry side exhibits the same permeability in all
directions, whereas the dispersed soil in the wet side is more permeable along
particle orientation than across particle orientation.
Compressibility
At low applied stresses, the dry compacted soil is less compressible on account of its
truss-like arrangement of particles whereas the wet compacted soil is more
compressible.
CONSOLIDATION
Consolidation is a process by which soils decrease in volume. According to Karl v
on Terzaghi“ consolidation is any process which involves a decrease in water
content of saturated soil without replacement of water by air."
Primary consolidation
This method assumes consolidation occurs in only one-dimension. Laboratory data is
used to construct a plot of strain or void ratio versus effective stress where the effective
stress axis is on a logarithmic scale .
Secondary consolidation
Secondary consolidation is the consolidation of soil that takes place after
primary consolidation. Even after the reduction of hydrostatic pressure some
consolidation of soil takes place at slow rate. This is known as secondary
consolidation
NORMALLY CONSOLIDATED CLAY-
A soil is normally consolidated when it has never been subjected to stress higher
than the present stress