For collapsible soil, compression will often occur as the overburden pressure increases due to the
placement of overlying fill or the construction of a building on top of the soil. The compression due
to this increase in overburden pressure involves a decrease in void ratio of the soil due to expulsion
of air. The compression usually occurs at constant moisture content. After completion of the project,
water may infiltrate the soil due to irrigation, rainfall, or leaky water pipes