EFFECT OF LOADING STAGE ON PEAT COMPRESSION AND DEFLECTION OF BAMBOO GRID WITH CONCRETE PILE

Abstract

Improvement of peat compression and increasing the bearing capacity can be achieved with the
embankment load as preloading. The embankment on peat soil has problems such as excessive settlement,
horizontal movement, and differential settlement. The stability of embankment is maintained with the
installation of the reinforcement system, but the time factor and duration of loading can affect the stability of
embankment and excess settlement. It is necessary to study the loading stages that can maximize compression
and minimize deflection so that stability can be maintained. The embankment load test was performed on peat
soil reinforced with bamboo grid and concrete piles. The model test in the laboratory used the test box
measuring 120 cm x 90 cm x 90 cm with a height of the peat soil of 50 cm. The embankment load was
distinguished based on the stage and duration of loading. The results showed that multiple stages is better than
the single-stage because settlement changes are relatively smaller than the other. The longer load duration
provides the opportunity to consolidate the peat layer so that the bearing capacity and the modulus of subgrade
reaction increases. The good stage load is obtained in three stages with the addition of the embankment load
of 3.02 kPa or 1/3 of the total load every 2 days or 1/3 of the total duration of the load. At this stage and
duration, the peat compression and the deflection of reinforcement are smaller than the others.