EFFECT OF PORE WATER PRESSURE IN RIVERSIDE ROADBED

Abstract

Abstract: Roadbeds along rivers are often affected by tides
and rain, there are always changes in groundwater levels and
water saturation in the soil. The pressure on the road causes
stress in the soil, this total stress includes the effective stress borne
by soil particles and the stress borne by water in the pores. Pore
water pressure causes flow in the soil, causing some small soil
particles to drift when the soil is not uniformly compacted - the
hydraulic gradient due to pore water pressure is greater than the
critical gradient of the compacted soil - will drift with the flow and
gradually increase the porosity of the soil. Pores in the roadbed are
formed over a long period of time and from the repeated impacts
of traffic vehicles, large-volume water pockets will be formed.
When the water pockets are large enough, the water pressure in
the foundation will be large and the roadbed collapse will occur