Since collapsible soils are been mostly transported by
wind and deposited in arid or semi-arid regions, they founded in a state of
unsaturated condition. In addition, engineering filling when placed in a
certain none want density, undesired settlement will be predictable either due
to wetting or due to loading on these soil deposits. Collapsibility study is
important for the foundation design and construction on these soils. The most
foundation systems used on these soils are isolated and strip footing connected
with concrete tie beams. Therefore studying rigid foundation system resting on
partially saturated collapsible soil/deposits is very important. The present work
investigated using rigid strip footing resting in collapsible soils to study
the effect of stress interference due to progressive wetting depth from leakage
of surface water on collapsibility settlement. The study has been investigated
the influence of different behavior of strip footing and inverted T-section
strip footing rigidity system resting on unsaturated soil by numerical analysis
using the finite element program PLAXIS 2D. The partially saturated collapsible
soil is stimulated using the Mohr-Coulomb soil model. The significance parameters are considered two types
of footing systems, collapsible soil thickness, use of sand cushion with geo-grid
reinforcement at the bottom third of its thickness, and different clear spacing
between source of surface water and strip footings on the stress-settlement
relationship. The results of this study confirmed that the most important soil
parameters in this problem are the use of reinforced sand cushion, decrease
applied stress as well as rigid inverted T-section strip footing are more
suitable for controlling Soil collapsibility, while the settlement is found to
decrease. To avoid many observation of spread footing disaster that founded and rest on collapse
soil. In addition, the results can be guide for design engineers, how to choose
foundation type and the effect of spacing water resource.
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