An Alternative For New Road Embankment At Belanti Ex-Plg Food Estate Area, Pulang Pisau Regency – 3 (Case Study: Sta. 4+600 – Sta. 4+910 (Segment 1) and Sta. 0+000 – Sta. 0+065 (Segment 2))

Abstract

Oneof the lands used for the Food Estate program is a former peat land project, which is the Food Estate Area of the former PLG (PLG; proyek lahan gambut) of Belanti, Pulang Pisau Regency. In Sta 5+116, there is a market which makes road widening or the creation of road shoulder especially challenging. Therefore, the local government proposed to make an alternative route. The compression calculation analysis results in the first year, there is a settlement of 10.053 cm/year. Referring to MDP 2017, improvements need to be made by adding wood piles, or cerucuk, into the subgrade. Another soil improvement method is by using foam mortar, namely base and subbase; the qtimb of the baseis 2.4 kN/m2and the qtimb of the subbaseis 3.9 kN/m2for γaverage = 7 kN/m3and φaverage of 42.5°. The analysis of settlement time shows 3.6 mm/year, while the last step, which is the hydrostatic force analysis, revealed that foam mortar has a safety factor of 4.507, i.e., all have fulfilled existing requirements and are considered safe.The soil improvement method used to remove compression of subgrade employed wood piles, or cerucuk. The dimension of the cerucuk used is 10 cm for the diameter and 5 m for the depth,and the required number of cerucuk is 77. In order to reduce the subgrade compression, foam mortar was used as a road embankment material with consolidation compression occurring in the subgrade being 7,179 cm.