Yudianto, Anambi Mono (2022) Analisis Deformasi Lereng Dengan Perkuatan Soil Nailing Pada Proyek Pembangunan Jalan Baru batas Kota Singaraja - Mengwitani. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Salah satu perkuatan pada lereng yang ada pada pembangunan jalan baru Bts. Kota Singaraja-Mengwitani adalah soil nailing. Kondisi saat ini lereng dengan perkuatan soil nailing dalam keadaan stabil. Namun perlu diperhatikan jika terdapat perubahan faktor lingkungan yaitu : beban gempa, surcharge, dan soil nailing yang mengalami creep.
Berdasarkan permasalahan di atas, perlu dianalisis pengaruh dari perubahan faktor-faktor tersebut terhadap kestabilan lereng. Analisis dilakukan menggunakan program bantu PLAXIS. Berdasarkan hasil analisis PLAXIS, didapatkan angka deformasi dan faktor keamanan. Dari nilai tersebut akan disusun suatu grafik hubungan antara faktor keamanan dengan angka deformasi. Tujuan dilakukan penelitian ini adalah untuk memberikan suatu batas bahaya berupa angka deformasi dimana deformasi tersebut terjadi pada saat faktor keamanan dalam kondisi kritis (FK=1).
Hasil analisis menunjukkan, dengan kenaikan percepatan gempa 0.05g, deformasi yang terjadi mengalami peningkatan rata-rata 16.26% dan stabilitas global mengalami penurunan rata-rata 3% untuk STA 0+275, 0+300, dan 0+325. Untuk STA 0+950 deformasi yang terjadi mengalami peningkatan rata-rata 19.52% dan stabilitas global mengalami penurunan rata-rata 5.2%. Dengan pengaruh percepatan gempa, STA 0+275, 0+300, dan 0+325 mengalami deformasi pada kondisi faktor keamanan kritis sebesar 107.8mm, 193.82mm, dan 70.62mm. Sedangkan STA 0+950 mengalami deformasi sebesar 68.09mm.
Hasil penelitian selanjutnya menunjukkan, dengan kenaikan beban di atas lereng 10 kPa, deformasi yang terjadi mengalami peningkatan rata-rata 80.18% dan stabilitas global mengalami penurunan rata-rata 3.35% untuk STA 0+272, 0+300, dan 0+325. Untuk STA 0+950 deformasi yang terjadi mengalami peningkatan rata-rata 125% dan stabilitas global mengalami penurunan rata-rata 14.43%. Dengan pengaruh beban di atas lereng, STA 0+275, 0+300, dan 0+325 mengalami deformasi pada kondisi faktor keamanan kritis sebesar 86.27mm, 152.6mm, dan 44.31mm. STA 0+950 mengalami deformasi sebesar 35.89mm.
Penurunan modulus elastisitas soil nailing tidak berpengaruh terhadap deformasi dan faktor keamanan lereng. Deformasi dan faktor keamanan cenderung tetap seiring menurunnya modulus elastisitas. Hal tersebut membuktikan bahwa simulasi creep tidak dapat dilakukan hanya dengan menurunkan modulus elastisitas saja.
Beban kombinasi menunjukkan beban yang paling berpengaruh besar terhadap kestabilan lereng. STA 0+950 runtuh pada beban kombinasi percapatan gempa 0.4g dan beban di atas lereng sebesar 40 kPa.
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One of the existing slope reinforcements in the construction of the new Singaraja – Mengwitani road is soil nailing. The current condition of the slope with soil nailing reinforcement is in a stable condition. However, it should be noted if there are changes in environmental factors, namely: earthquake loads, surcharges, and creep in soil nailing.
With the problems described above, it is necessary to analyze the effect of these environmental factors on the stability of the slope. The analysis was carried out using the PLAXIS program. Based on the results of the PLAXIS analysis, the soil deformation number and safety factor were obtained. From this value, a graph of the relationship between the safety factor and soil deformation number will be drawn up. The purpose of this research is to provide a hazard limit in the form of a number of deformations where the deformation occurs when the safety factor is in a critical condition (FS=1).
The results of the analysis show that with an increase in earthquake acceleration of 0.05g, the deformation that occurs has an average increase of 16.26% and global stability has decreased by an average of 3% for STA 0+275, 0+300, and 0+325. For STA 0+950, the deformation experienced an average increase of 19.52% and global stability decreased by an average of 5.2%. With the influence of earthquake acceleration, STA 0+275, 0+300, and 0+325 deformed by 107.8mm, 193.82mm, and 70.62mm at the critical safety factor conditions. Meanwhile, STA 0+950 experienced a deformation of 68.09mm.
The results of the next study showed that with an increase in load on a 10 kPa slope, the deformation that occurred increased by an average of 80.18% and global stability decreased by an average of 3.35% for STA 0+272, 0+300, and 0+325. For STA 0+950, the deformation experienced an average increase of 125% and global stability decreased by an average of 14.43%. With the influence of the load on the slope, STA 0+275, 0+300, and 0+325 deformed by 86.27mm, 152.6mm, and 44.31mm at the critical safety factor conditions. STA 0+950 is deformed by 35.89mm.
The decrease in the modulus of elasticity of the soil nailing has no effect on the deformation and slope safety factor. The deformation and factor of safety tend to remain constant as the modulus of elasticity decreases. This proves that creep simulation cannot be done by simply lowering the modulus of elasticity.
The combined load shows the load that has the most influence on the stability of the slope. STA 0+950 collapsed under a combined load of 0.4g earthquake acceleration and a load on a slope of 40 kPa.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | soil nailing, slope, Singaraja, Mengwitani, PLAXIS |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis |
| Depositing User: | Anambi Mono Yudianto |
| Date Deposited: | 04 Feb 2022 01:17 |
| Last Modified: | 10 Jun 2024 03:49 |
| URI: | http://repository.its.ac.id/id/eprint/92766 |
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