PLANNING OF RIVER FLOW CONTROL AND LANDSLIDE CONTROL BUILDINGS IN WALET VILLAGE, NORTH BARITO REGENCY

Abstract

The landslide at one point on the Walet Village road was caused by the scouring of the Montallat River water. Due to the scouring of river water, the cliff on the shoulder of the road experienced a landslide towards the river. As a result of the cliff landslide, the road slowly erodes at that point.

This planning begins with a literature study by collecting and studying previous literature related to planning. Then proceed with collecting soil investigation data. Continue with calculating the stability of the retaining wall. After that, it was modelled and analyzed using GeoStudio 2018 software to get the safety factor value. Finally, the dimensions of the river basin were calculated.

From the planning results, it is obtained that the Gravity Wall has dimensions of a wall height of 4.2 meters, top wall width of 0.35 meters, wall toe width of 2.94 meters, wall toe height of 0.70 meters, and wall toe width of 0.70 meters. Meanwhile, for the rolling stability of the retaining wall, the value was 2.151 ≥ 1.5, the shear stability of the retaining wall was obtained with a value of 0.593 ≤ 2, the stability of the bearing capacity of the retaining wall was obtained as a value of 1.048 ≤ 3, so it is planned to install piles to increase the bearing capacity with a diameter 0.40 meters, 8 meters long, with a distance between poles of 1 meter. The safety factor value of slope stability after handling is 1.618 ˃ 1.5, so it is said to be safe. Then, the permeable river crib has large gaps with the dimensions of the crib, namely the length of the stiffening beam is 7.50 meters, the height of the stiffening beam is 0.70 meters, the width of the stiffening beam is 0.50 meters, the diameter of the piles is 0.20 meters, the length of the piles is 10 meters, the distance between 14.00 meters of crib, five cribs, and four piles for each crib.

Keywords: Landslides, Retaining Walls, Slope Stability, Permeable Crib