Abstract:
Dadahup Swamp Irrigation Area in Central Kalimantan Province has a land area
of 21,226 Ha which carries out the water management system of Barito River, Kapuas
Murung River and Mangkatip River. The site has many waterways that are parts of the
Food Estate national strategic program which is aimed to supply the food demand.
Dadahup Swamp Irrigation Area also has secondary canal that drains and supplies the
water to rice fields. A slope failure occurred during the construction of new waterways
nearby the traffic access road. The landslide site was in Bina Jaya Village, Jalan DIR
Dadahup, Central Kalimantan Province. PLAXIS software was used in slope stability
analysis. Seen from the soil characteristics, particularly at the canal bottom and canal
slopes, soft clay soil dominated to a depth of 20 meters from the surface. Soft clay has
a small shear strength and slides when triggered. Sheet piles of 18 meters long was
selected as the slope reinforcement to handle the landslide around the Sluice Gate
construction area. The sheet pile reinforcement improved the slope stability as seen
from the value of the safety factor which exceeded the minimum requirements set in SNI
8460 of 2017
