Page 11 - Grp3-Soil magazine (Final-Vid ver)

C H A P T E R 4 : S O I L C O M P A C T I O N
CHAPTER 4: SOIL COMPACTION
CHAPTER 4: SOIL COMPACTION

O
I
O
SOIL COMPACTION
L
SOIL MODIFICATION SS O I L C O M P A C T I I O N
N
M
O
C
P
T
C
A
Process of improving soil Densification of soil, through
engineering properties such external mechanical forces
as shear strength, bearing that cause air to squeeze
capacity, permeability and out.
so on.
Type of soil modification:
a) Mechanical modification
b) Physical and Chemical
modification
c) Hydraulic modification
d) By inclusions and
Video for Soil Compaction
confinement.

GENERAL PRINCIPLE

γ
When w=0, the moist unit weight ( ) will equal to dry
γ
unit weight ( ) . Beyond certain water content (w) =
d
γ
water content2 (w2), increase in w will cause to
d
reduces. Due to the water takes up the spaces that
would have been occupied by solid particles. At
γ
maximum , it is referred as optimum moisture
d
content.
Calculation dry unit weight

W = the weight of the mold and the
soil mass (kg)
Wm = the weight of the mold (kg)
w = the water content of the soil (%)
V = the volume of the mold (m3,
typically 0.033m3)

Calculation air voids curve

Soil Compaction Curve

G
= the specific gravity of soil particles
G
s
(typically, ~2.70)
s
Effect of Compactive Effort (CE) on Soil
γ
= the saturated unit weight of the soil
Compaction Curve
w
(kN/m3)
PAGE 11