KAJIAN PENANGANAN PENURUNAN TANAH PADA JALUR KERETA API DENGAN PENDEKATAN RAILWAY EMBANKMENT TREATMENT SOLUTION (RETRASOL)

Abstract

The main problems found on the railway track between Km 233+300 and Km 234+300 on

the Kemelak–Baturaja line are mud pumping due to a drainage system that is not functioning

optimally, slope erosion, and subsidence on the railway track, which has the potential to

disrupt the safety of railway operations. This study aims to analyse the effectiveness of

implementing the Railway Embankment Treatment Solution (Retrasol) system in addressing

ground subsidence and improving railway track stability. The research method employs a

quantitative experimental approach through topographic measurements, sounding tests, and

hydrological data analysis. The calculation results show that the slope safety factor ranges

from 1.084 to 1.23 for static conditions and 0.90 to 0.98 for dynamic conditions, indicating

that the existing railway roadbed is highly prone to landslides. The simulation results show

that there is an increase in the slope safety factor after the retaining wall reinforcement,

namely 2.508 for normal conditions and 1.939 when the MAT condition rises. The retaining

wall will be installed on the railway embankment along a 350 m stretch. Improvements to the

drainage system are also needed to reduce the risk of surface erosion, which also functions

as a retaining wall on the railway embankment using 0.6 m U-ditch material along a 450 m

stretch. These findings prove that the Retrasol system is effective in improving the stability

of the railway embankment slope.