ANALYSIS SEEPAGE AND SLOPE STABILITY FOR DAM: CASE STUDY JLANTAH DAM IN JATIYOSO, KARANGANYAR REGENCY, CENTRAL JAVA
Jlantah Dam is one of the National Strategic Projects (PSN) whose construction began in 2019 and is targeted to be completed by December 2023. This dam is located in the Tlobo and Karangsari villages, Jatiyoso District, Karanganyar Regency, Central Java. With a storage capacity of up to 11.96...
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| Format: | Final Project |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/80233 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Jlantah Dam is one of the National Strategic Projects (PSN) whose construction
began in 2019 and is targeted to be completed by December 2023. This dam is
located in the Tlobo and Karangsari villages, Jatiyoso District, Karanganyar
Regency, Central Java. With a storage capacity of up to 11.96 million m3
, this
dam is designed as a zonal embankment dam with a random sand gravelly zonal
vertical core. The Jlantah Dam is expected to irrigate an area of 1494 ha and
provide raw water at a rate of 150 liters/second. The construction of the dam not
only promises significant benefits but also poses potential hazards in the event of
failure. Therefore, a study is needed to assess the safety of the Jlantah Dam under
various conditions, including seismic events.
The study includes seepage analysis using the Slide2 software and dam stability
analysis using the slide2 software by reviewing the dam's geometry. The data used
as input in these analyses include soil permeability coefficients, internal friction
angles, soil cohesion, and soil density based on field investigations and
laboratory analyses that began in 2017. In the seepage analysis, manual
calculations were also performed using the Casagrande method to compare the
results obtained from Slide2.
From the seepage analysis using slide2, the Jlantah Dam is classified as safe
against leakage, with the largest flow rate of 8,8264 x 10-3 m
3
/s occurring at the
normal water surface elevation. The seepage flow rate is inversely proportional to
the slope safety factor. In the dam stability analysis using Slide2, there are several
unsafe conditions with the lowest safety factor of 0.81 occurring on the upstream
slope at the normal water surface elevation due to the SEE (Safety Evaluation
Earthquake) loading. The analysis results yield the largest permanent
displacement value of 95 cm with an earthquake magnitude of Ms = 8.25; Y/H =
0.25. This value is still smaller than the required permanent displacement value of
250 m, indicating that the dam slope remains in a safe condition. |
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