ALTERNATIF PENANGGULANGAN MASALAH LONGSORAN TEBING (STUDI KASUS LERENG Sta. 20+300 RUAS TOL PEKANBARU-KANDIS-DUMAI)

handoko, yohan r (2025) ALTERNATIF PENANGGULANGAN MASALAH LONGSORAN TEBING (STUDI KASUS LERENG Sta. 20+300 RUAS TOL PEKANBARU-KANDIS-DUMAI). Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Jalan Tol Pekanbaru-Kandis-Dumai melalui daerah dengan kondisi
topografi yang berbukit dengan lembah yang curam dan berkelok-kelok. Kondisi
semacam ini akan memaksa trase jalan tol untuk memotong dan mengikuti kontur
untuk mendapatkan alinyemen jalan, baik alinyemen horizontal maupun vertikal,
yang memenuhi standar desain. Tebing atau lereng yang timbul dari pekerjaan
timbunan tersebut memerlukan penanganan khusus agar dinding tebing atau lereng
tersebut tidak longsor/runtuh.
Pada Bulan April 2024, di daerah Sta. 20+300 terjadi keruntuhan lereng atau
longsor yang berakibat mengganggu aktivitas jalan tol ke arah Pekanbaru. Analisa
Metode Equilibrium sering digunakan dalam mencari faktor keamanan lereng.
Peneliti mencoba melakukan analisa mengenai faktor apa yang mempengaruhi
stabilitas lereng Ruas Tol Pekanbaru-Kandis-Dumai dengan melakukan pemodelan
ke dalam software. Analisa Metode Equilibrium menggunakan software Geo5.
Dengan software Geo5 kita dapat mengetahui pengaruh kenaikan muka air tanah
terhadap keamanan lereng, pengaruh variasi beban pada puncak lereng terhadap
keamanan lereng.
Dari hasil analisis penyebab terjadinya longsor adalah Hujan sangat lebat
sehingga crack-crack yang ada terisi air sehingga penjalaran crack sudah kritis dan
akhirnya kelongsoran terjadi. Kenaikan Tekanan Air Pori: saat muka air tanah
tinggi, tekanana air pori meningkat, ini menyebabkan kuat geser tanah menurun
karena parameter efektif menjadi lebih kecil dan lereng menjadi tidak stabil. Berat tanah bertambah: saat jenuh air, berat total tanah akan meningkat dan Driving Force
membesar, sehingga stabilitas lereng menurun.
Untuk itu dilakukan analisis dengan menggunakan Geo5 dengan 3 alternatif solusi
yaitu dinding penahan tanah, soil nailing dan secant pile. Dari hasil analisis tersebut
didapatkan dari kondisi eksisting dengan metode konvensional nilai safety factor
1.082 dan metode cracked soil didapatkan nilai 0.882. Setelah diberikan perkuatan
dengan Dinding penahan tanah di dapatkan nilai safety factor sebesar 1.007 hanya
naik sedikit dan tidak memenuhi persyaratan, sedangkan menggunakan perkuatan
soil nailing nilai safety factor static 1.552 dan gempa 1.158. Alternatif ke-3 dengan
secant pile di dapatkan nilai safety factor static sebesar 1.56 dan gempa 1.122.
Kata kunci : Analisa Stabilitas Lereng, Safety Factor, Soil Nailing, Secant Pile,
Geo5
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Pekanbaru-Kandis-Dumai Toll Road passes through an area with hilly and
mountainous topographic conditions with steep and winding valleys. This kind of
condition will force the toll road trajectory to cut and follow the contour to get the
road alignment, both horizontal and vertical alignment, which meets the design
standards. For this reason, the cliffs or slopes of the road will have to be filled. For
this reason, cliffs or slopes arising from the embankment work require special
handling so that the cliff walls or slopes do not landslide / collapse.
In April 2024, at Sta. 20+300 a slope collapse or landslide occurred which
resulted in disrupting toll road activities towards Pekanbaru. Equilibrium method
analysis is often used in finding the slope safety factor. Researchers try to analyze
what factors affect the stability of the Pekanbaru-Kandis-Dumai Toll Road slope by
modeling it into software. Equilibrium Method analysis using Geo5 software. With
Geo5 software we can find out the effect of groundwater level rise on slope safety,
the effect of load variation at the top of the slope on safety.
From the analysis results, the cause of the landslide is the Increase in Pore
Water Pressure: when the groundwater level is high, the pore water pressure
increases, this causes the shear strength of the soil to decrease because the effective
parameters become smaller and the slope becomes unstable. The weight of the soil
increases: when saturated with water, the total weight of the soil will increase and
the Driving Force will increase, so that the slope stability decreases.
For this reason, an analysis was carried out using Geo5 with 3 alternative
solutions, namely retaining walls, soil nailing and secant piles. From the results of the analysis, it was obtained from the existing conditions with the conventional
method, the safety factor value was 1.082 and the cracked soil method obtained a
value of 0.882. After being reinforced with a retaining wall, a safety factor value of
1.007 was obtained, only increasing slightly and not meeting the requirements,
while using soil nailing reinforcement, the static safety factor value was 1.552 and
the earthquake was 1.158. The 3rd alternative with secant piles obtained a static
safety factor value of 1.56 and an earthquake of 1.122.
Keywords: Slope Stability Analysis, Safety Factor, Soil Nailing, Secant Pile, Geo5

Item Type:	Thesis (Masters)
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization
Divisions:	Faculty of Civil Engineering and Planning > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	Yohan Rahayu Handoko
Date Deposited:	04 Aug 2025 09:46
Last Modified:	04 Aug 2025 09:46
URI:	http://repository.its.ac.id/id/eprint/125711

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