Rahmad, Zahrial Firman (2024) Analisis Desain Eksisting Perkuatan Lereng pada Tanah Batuan Lempung Serta Alternatif Modifikasinya dengan 2D & 3D. Studi Kasus: Ruas Jalan Awunio – Lapuko KM 68+944 – KM 69+084, Provinsi Sulawesi Tenggara. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Lereng pada ruas jalan nasional Awunio – Lapuko sering mengalami kelongsoran sehingga membahayakan manajemen aset jalan. Padahal lapisan tanah keras dengan nilai NSPT >60 berada pada kedalaman tanah keras 4 meter. Lereng telah diperkuat dengan dinding penahan tanah (DPT) dan pondasi sumuran maupun DPT dan pondasi bored pile. Dalam hal ini, masalah yang perlu distudi adalah stabilitas lereng eksisting dengan dan tanpa perkuatan. Dalam penelitian ini, permasalahan tersebut akan dianalisis dengan pendekatan Cracked soil untuk mendapatkan Faktor Keamanan (FK) kondisi terkritis. Analisis stabilitas lereng kondisi eksisting dilakukan dengan limit equilibrium method (LEM) dan finite element method (FEM) secara 2D dan 3D untuk menjamin jumlah perkuatan eksisting cukup dan efisien. Pada Analisa 2D, lereng dianggap memiliki panjang menerus dan pada analisis 3D, bentuk lereng akan sesuai dengan kondisi lapangan sehingga analisis 3D dianggap lebih realistis. DPT harus dihitung stabilitasnya terhadap guling, geser, daya dukung pondasi. Selain itu, bored pile juga harus dievaluasi jika dianggap sebagai tiang lateral berdasarkan NAVFAC, kapasitas daya dukung dalam grup, tegangan max. & min. yang diijinkan serta kapasitas defleksi. Analisis hidrologi juga dilakukan untuk memastikan air permukaan diatur dengan baik melalui saluran drainase. Hasil analisis program LEM dan FEM menunjukkan mekanisme keruntuhan lereng pada ruas jalan Awunio - Lapuko akibat adanya bidang gelincir antara lapisan tanah lemah dan lapisan tanah kuat. Nilai FK lereng eksisting dengan model 2D lebih tinggi dari pada model 3D. Pada model 3D, bentuk geometri lereng yang melengkung ke dalam memiliki FK yang lebih tinggi dari bentuk lurus. Selanjutnya, stabilitas perkuatan dengan DPT tanpa pondasi tidak memadai. Sedangkan stabilitas perkuatan DPT dengan sumuran/bored pile atau modifikasi alternatif berupa subdrain dan geotekstil memenuhi persyaratan. Yang terakhir, kapasitas saluran drainase dalam menampung debit hujan rencana telah memadai =================================================================================================================================
Slopes on the Awunio - Lapuko national road section are often subject to landslides, which endanger the road asset management. The hard soil layer with an NSPT value> 60 is located at a depth of 4 meters. The slopes have been reinforced with retaining walls (RW) and caission as well as RW and bored pile foundations. In this case, the problem that needs to be studied is the stability of the existing slope with and without reinforcement. In this research, the problem is analyzed using the Cracked soil approach to obtain the critical Factor of Safety (SF). The stability analysis of the existing condition slope is carried out by limit equilibrium method (LEM) and finite element method (FEM) in 2D and 3D to ensure the amount of existing reinforcement is sufficient and efficient. In the 2D analysis, the slope is considered to have a continuous length and in the 3D analysis, the slope shape matches the field conditions so that the 3D analysis is considered more realistic. The RW must be calculated for stability against overturning, sliding, bearing capacity of the foundation. In addition, bored piles should also be evaluated if considered as lateral piles based on NAVFAC, bearing capacity within the group, max. & min. allowable stresses and deflection capacity. Hydrological analysis is also carried out to ensure surface water is properly regulated through drainage channels. The results of the LEM and FEM program analysis show that the slope collapse mechanism on the Awunio - Lapuko road section is due to the existence of a sliding plane between the weak soil layer and the strong soil layer. The SF value of the existing slope with the 2D model is higher than the 3D model. In the 3D model, the slope geometry that curves inward has a higher FS than the straight shape. Furthermore, the stability of reinforcement with RW only is not adequate. While the stability of reinforcement such as RW with bored piles/caisson or alternative modifications such as subdrains and geotextiles meets the requirements. Finally, the capacity of the drainage channel in accommodating the planned rainfall discharge is adequate.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | manajemen aset jalan, stabilitas lereng, Cracked soil, bored pile, subdrain – geotekstil, road asset management, slope stability |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA775 Foundations. |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis |
| Depositing User: | Zahrial Firman Rahmad |
| Date Deposited: | 08 Feb 2024 09:09 |
| Last Modified: | 08 Feb 2024 09:09 |
| URI: | http://repository.its.ac.id/id/eprint/106464 |
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