TITLE:
Practical Engineering Behavior of Egyptian Collapsible Soils, Laboratory and In-Situ Experimental Study
AUTHORS:
Naema A. Ali
KEYWORDS:
Natural Water Content, Natural Soil Structure, Collapsibility Properties, Field Test
JOURNAL NAME:
Open Journal of Civil Engineering,
Vol.11 No.3,
August
23,
2021
ABSTRACT: In many sites on Egypt desert roads collapsible soils is broadly classified as a problematic soils containing silty fine sand which is cemented
with low density and low degree of saturation which is susceptible to a large
and sudden reduction in their volume upon
inundation, with or without vibration in its stress. Four sites have been
studied for new urban, roads and industry work sits, related to increase in natural water
content. These soils go through radical rearrangement of
their particles, causing sudden changes in the stress-deformation behavior
which cause differential settlement of foundation and roads.
This change in volume can lead to foundation failures and
worth of damages under ground public facilities and infrastructure. In this
study, the search program is developed to establish their different behavior under wetting in two
phases: field and laboratory work. The obtained results are useful in mapping
the trend of the factors affected in
assessing soil collapsibility rate or collapse potentials which are observed in construction with volume change problems. The major factors
observed are the natural structure skeleton of the soil particle and its grain
size and mechanism of soil sedimentation. The field collapse potentials value
assigned for these tested sites along Alexandria—Cairo
desert road indicated that the field measured collapsibility potentials are
smaller than those measured on the same extracted undisturbed samples in laboratory
by 15%, which can be saved in coast, change in proposed collapsibility improvement method and
change in select foundation type. Also, field tests evaluate the collapsibility
rate with time and highlight that environmental history and natural soil structure
in field are the important factors affected on these soil collapse, and also,
knowledgeable by collapsible soils during wetting in these sites studied.