الفهرس 
REVIEWOFLITERATUREOnly 14 pages are availabe for public view
 |  | from | 94 |  |  |
| | | from | 94 | | |
Abstract
Capilla::.7friI’.geis a phenomenon which OCCllrS dna’ to
surface tiens.Lon, Surfa~e tension is the maf,n source of
capillary fo::,casin soil. The height of the capillary
fringe diffe::’saccording to the soil grain size and
heat temperature~
As long as similarity exists within the soil grains,
researchers consider £r~portional equality betrween the
moisture degrees along the capillary fringe~ Hence the
static w~ter pressure in the capillary fri~ge takes a
linear shape which starts with atmospheric pressure at
the surface of the water table, and decreases with a
constant rate until it reaches the end of the capillary
rise, which is less than atmospheric pressure by the
weight .~f the water column above it.
The distribution of relative moisture in the capi-
llary region changes from one depth to the other,
follOwing a curve with a maximum degree of saturation at the region located above the water table c~ectly
and extends up to a certain height where vapour dimin; shes,
then moisture ccntent decreases with a high rate to reach the hygroscopic moisture the shape of that
curve coincides with the observations of several researchers
such as Prof. Lamb as will be discussed later.
In practice several problems concerning the study
of that curve appear, such as lowering the water table
in tile drainage, the most suitable depth to construct a
drain, excav~tion for foundations below water table, and
eS-’;iIlationof’ the soil pressure upon sheet piles and
reta.:Lni_;J.gwa Lls ,
Th3refo.L’e, tin de~erni::lation of trb.e mcd.strur-e content
curve alone tile copill.D1Y fringe is so im.fortant to
so lIll...ny pr-obLenn •
.’.
In this eventr a d:.i..scussLonof these observations
and cor-r-e.LatLon of t:2e ShaP’3 of the racd.atrur-ecorrtentr
cur-ve with the phyai.ca.Iand mechanical ch.aracteristics
of ~ferent soils is given rate to reach the hygroscopic moisture the shape of that
curve coincides with the observations of several researchers
such as Prof. Lamb as will be discussed later.
In practice several problems concerning the study
of that curve appear, such as lowering the water table
in tile drainage, the most suitable depth to construct a
drain, excav~tion for foundations below water table, and
eS-’;iIlationof’ the soil pressure upon sheet piles and
reta.:Lni_;J.gwa Lls ,
Th3refo.L’e, tin de~erni::lation of trb.e mcd.strur-e content
curve alone tile copill.D1Y fringe is so im.fortant to
so lIll...ny pr-obLenn •
.’.
In this eventr a d:.i..scussLonof these observations
and cor-r-e.LatLon of t:2e ShaP’3 of the racd.atrur-ecorrtentr
cur-ve with the phyai.ca.Iand mechanical ch.aracteristics
of ~ferent soils is given~