Identification and Mitigation of Landslide-Triggering Factors Around Railway Tracks
Ika Sakti Octaviarini, Prof. Ir. T. Faisal Fathani, S.T., M.T., Ph.D., IPU., ASEAN.Eng. ; Prof. Dr. Ir. Hary Christady Hardiyatmo, M.Eng., DEA.
2024 | Tesis | S2 Teknik Sipil
A landslide is a geological disaster that often occurs
in the tropics, including Indonesia. In Indonesia, for example, during the last
ten years, landslide events have resulted, either directly or indirectly, in
more than 537 deaths and economic losses at about US$ 10 million annually
(Tohari, 2018). A prone area for landslide was identified on the Central Java
railway line which could cause damage to the double-track railway as a
transportation infrastructure. To protect its railway, the identification of
landslide trigger factors is necessary to be carried out and the protection
work needs to be planned. This study aimed to identify landslide trigger factors,
predict landslide potential, and plan
protection work against landslides using geosynthetics.
Information was collected through
field investigations and measurements based on field investigation at 3 points,
geophysical surveys at 5 lines, and laboratory testing of several soil samples.
Geological and geotechnical settings, topography, lithology, hydrogeology, and
rainfall data of the area were analyzed to determine the factors that trigger
landslides. The landslide potential is analyzed analytically by considering the
infiltration process using the Green-Ampt equation. Meanwhile, the geosynthetics
reinforced slope design is evaluated using existing equations and using the
limit equilibrium method (LEM) and finite element method (FEM).
Based on the analysis results,
the landslide that occurred was triggered by several factors, including the
slope material which is dominated by clay, low intensity-long duration
rainfall, and external loads from trains passing on the slope. The slope stability
in the research area is influenced greatly by two types of rainfall - light
rain and normal rain. The slopes around the main landslide location are
predicted to fail due to continuous rain that has occurred for several days to
months. As an effort to mitigate landslides, a geosynthetic reinforced slope
was designed with a vertical spacing of 0.5 m and equipped with several other
components, such as gabions, surface drainage and surface protection. Apart
from that, landslide mitigation using sheet piles was also designed as an
alternative, which uses CCSP W-450 type sheet piles with an embedded length of
14 m and a free-standing length of 2 m.
A landslide is a geological disaster that often occurs
in the tropics, including Indonesia. In Indonesia, for example, during the last
ten years, landslide events have resulted, either directly or indirectly, in
more than 537 deaths and economic losses at about US$ 10 million annually
(Tohari, 2018). A prone area for landslide was identified on the Central Java
railway line which could cause damage to the double-track railway as a
transportation infrastructure. To protect its railway, the identification of
landslide trigger factors is necessary to be carried out and the protection
work needs to be planned. This study aimed to identify landslide trigger factors,
predict landslide potential, and plan
protection work against landslides using geosynthetics.
Information was collected through
field investigations and measurements based on field investigation at 3 points,
geophysical surveys at 5 lines, and laboratory testing of several soil samples.
Geological and geotechnical settings, topography, lithology, hydrogeology, and
rainfall data of the area were analyzed to determine the factors that trigger
landslides. The landslide potential is analyzed analytically by considering the
infiltration process using the Green-Ampt equation. Meanwhile, the geosynthetics
reinforced slope design is evaluated using existing equations and using the
limit equilibrium method (LEM) and finite element method (FEM).
Based on the analysis results,
the landslide that occurred was triggered by several factors, including the
slope material which is dominated by clay, low intensity-long duration
rainfall, and external loads from trains passing on the slope. The slope stability
in the research area is influenced greatly by two types of rainfall - light
rain and normal rain. The slopes around the main landslide location are
predicted to fail due to continuous rain that has occurred for several days to
months. As an effort to mitigate landslides, a geosynthetic reinforced slope
was designed with a vertical spacing of 0.5 m and equipped with several other
components, such as gabions, surface drainage and surface protection. Apart
from that, landslide mitigation using sheet piles was also designed as an
alternative, which uses CCSP W-450 type sheet piles with an embedded length of
14 m and a free-standing length of 2 m.
Kata Kunci : mass movement, landslide prediction, Green-Ampt, infiltration, mitigation measure
