Data
The drain properties
entered are displayed. Select data to modify.
General
ID
ID numbers are sequentially
assigned to the Drain Property data in the order of which it has been
defined.
Name
Name of the Drain Property
data.
Type
Select
a drain type.
PBD
Plastic Board Drain
is used to improve soft ground whose advantages are known for economy,
ease of construction and quality management.
SCP
Sand Compaction Pile
involves driving and vibrating closely-spaced sand columns into the soft
ground forming compaction piles.
GCP
Gravel Compaction Pile
involves driving and vibrating closely-spaced gravel columns into the
soft ground forming compaction piles.
SD
Sand Drain involves
drilling vertical holes into a cohesive soil and filling the holes with
sand, which expels pore water to promote consolidation by reduced drainage
distance.
Pack
Pack Drain, Polyethylene
involves woven geotextile bag columns filled with sand compacted into
the soft ground to promote consolidation drainage.
CD
Cylindrical Drain is
vertically installed into a soft cohesive soil, which is a punched spiral
pipe functioning as drain board. It promotes consolidation settlement
by expelling pore water to the surface.
Fiber
Fiber, outstanding for
drainage effect, is vertically placed into the ground, which dewaters
pore water to promote consolidation by reducing the drainage distance.
Recently more environment
friendly natural fiber materials such as coconut fiber and burlap fabric
have been used.
Array
Select a drainage layout
in plan.
Triangular
Arrangement
Refer to the diagram.
Rectangular
Arrangement
Refer to the diagram.
Center
to Center Spacing
Enter
the drainage spacing.
Calculation
Option
Method
Select a proposed theoretical
equation for radial consolidation.
Hansbo
The average consolidation
at a given depth is calculated when vertical drainage is installed reflecting
smearing effect (ground disturbance) and well resistance (Drainage Resistance:
Activated, Disturbance Effect: Activated).
Barron
The average degree of
consolidation over the total consolidation layers is calculated under
the equal strain consolidation condition (Drainage Resistance: Deactivated,
Disturbance Effect: Deactivated).
Yoshikuni
The proposed equation
by Yoshikuni (1979) calculates the average degree of consolidation considering
only the effect of drainage resistance (Drainage Resistance: Activated,
Disturbance Effect: Deactivated).
Onoue
The equation is proposed
by Onoue (1988), which can consider the effect of disturbance region and
drainage resistance irrespective of permeability, on the basis of the
use of the drainage resistance factor proposed by Yoshikuni and Nakamodo
(1974) (Drainage Resistance: Activated, Disturbance Effect: Activated).
Drain
Resistance
Drain Resistance considers
the phenomenon for delayed consolidation due to the degradation of the
flow-ability of vertical drainage as the consolidation progresses.
Smear
Effect
Disturbance Effect considers
delayed consolidation due to the degradation of the coefficient of consolidation
from soil disturbance.
Smear/Well
Properties
Diameter
(dw)
Enter
the diameter of the drain. Use the transformed diameter in case of PBD.
Permeability
(kw)
Coefficient
of Permeability for the drainage.
Consolidation
Coefficient Ratio (Cv/Ch)
The
ratio of the coefficients of consolidation in the vertical direction to
the horizontal direction.
Diameter
of Smear Zone (ds)
Transformed
diameter of the disturbed region.
Permeability
Ratio of Smear Zone (Kh/Ks)
The
ratio of the coefficients of permeability of the original ground in the
horizontal direction to that of the disturbed region.
Section
Information
Horizontal
section of the drainage layout.
SCP
/ GCP Properties
Stress
Sharing Ratio
Stress distribution
ratio of complex ground.
Internal
Friction Angle
Internal friction angle
of SCP/GCP.
Unit
Weight
Unit weight of SCP/GCP.
Saturated
Unit Weight
Saturated unit weight
of SCP/GCP.
Pack
Drain
L1
Casting spacing of drainage
in the longitudinal direction.
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