Sari, Dewi Ferlita (2023) Alternatif Perkuatan Lereng Galian Pada Proyek Pembangunan Jalur Lintas Selatan Lot 7, Blitar, Jawa Timur. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Proyek Jalur Lintas Selatan Lot 7, STA 6+490 - 6+610, jalan direncanakan berada dalam galian yang cukup dalam yaitu 8,0 – 12,0 meter dengan konstruksi lereng terbuka bagian atas dan lereng tegak bagian bawah yang diperkuat dengan retaining wall setinggi 5 m dengan pondasi strauss pile. Tanahnya adalah lempung dengan konsitensi medium to stiff (kedalaman 0 – 5,0 m) dan stiff to very stiff (kedalaman 5,0 – 10,0 m). Dalam studi ini akan dilakukan analisis untuk mengetahui stabilitas lereng eksisting (tanpa perkuatan) dan perencanaan eksisting (menggunakan retaining wall dan pondasi strauss pile). Selain itu, akan dibuat perencanaan alternatif menggunakan Geoforce Segmental Retaining Wall (GSRW) yang dikombinasi dengan soil nailing sebagai pengganti perkuatan eksisting. Stabilitas lereng galian tanpa dan dengan perkuatan dinding penahan dicek dengan menggunakan program bantu. Lereng harus stabil terhadap kelongsoran lokal dan kelongsoran meneyeluruh (overall stability). Begitu juga dengan perencanaan perkuatan dinding penahan, perlu dicek kekuatan strauss pile dalam menerima beban vertical dan beban geser untuk menahan overall stability dari lereng. Selain itu, pengaruh beban gempa juga perlu diperhatikan mengingat lokasi proyek berada dalam daerah rawan gempa. Perencanaan GSRW didasarkan pada tekanan tanah lateral dibelakang GSRW; sedang perencanaan soil nailing didasarkan pada beban geser dalam menahan overall stability dari lereng Hasil analisis menunjukkan bahwa kondisi lereng eksisting tanpa perkuatan belum memenuhi syarat rencana overall stability lereng, jadi diperlukan perkuatan. Perencanaan perkuatan eksisting yang berupa retaining wall dengan pondasi strauss pile diameter 30 cm panjang 6,0 m sebanyak 4 buah per meter panjang dinding sudah stabil. Hanya saja, apabila beban gempa dimasukkan maka syarat stabilitas belum memenuhi; jadi perlu ditambah strauss pile atau ukurannya yang diperbesar. Perencanaan sisi kiri dengan lereng landai tapi galian lebih dalam memerlukan tambahan perkuatan 1 pile diameter 30 cm. Sedangkan perencanaan sisi kanan dengan lereng curam tapi galian lebih dangkal memerlukan tambahan perkuatan 1 pile diameter 45 cm. Apabila retaining wall diganti dengan GSRW yang ukuran panelnya (lebar 165cm tinggi 140cm) dan ditarik oleh 4 buah friction tie masing-masing selebar 15 cm dengan kuat tarik 30 kN/buah, maka diperlukan friction tie masing-masing sepanjang 4,5 m. Soil nailing direncanakan berdiameter 15cm dengan jumlah dan panjang yang bervariasi di masing-masing STA, tergantung pada besar kebutuhan momen perlawanan tambahan (∆MR) yang diperlukan. Secara ringkas dapat dijelaskan bahwa di lereng sebelah kiri dibutuhkan 3 buah / meter panjang lereng dengan panjang total soil nailing 7,0 – 10,0 meter termasuk panjang 2,0 – 4,0 meter panjang dibelakang bidang longsor. Lereng sebelah kanan (lereng lebih curam tapi galian lebih dangkal) membutuhkan lebih sedikit soil nailing yaitu 1-2 buah / meter panjang lereng dengan panjang total soil nailing 4,0 – 7,0 meter termasuk panjang 1,0 – 4,5 meter dibelakang bidang longsor. Jika pengaruh beban gempa dimasukkan, dengan perencanaan dan jumlah soil nailing yang sama juga sudah memenuhi syarat keamanan rencana
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The project of Jalur Lintas Selatan Lot 7, STA 6+490 - 6+610, the road is planned to be in a fairly deep excavation, namely 8.0 – 12.0 meters with construction of open upper slopes and lower vertical slopes which are reinforced with a 5 m high retaining wall with foundations strauss pile. The soil is clay with a medium to stiff consistency (0 – 5.0 m depth) and stiff to very stiff (5.0 – 10.0 m depth). In this study an analysis will be carried out to determine the stability of the existing slopes (without reinforcement) and the existing planning (using retaining walls and Strauss pile foundations). In addition, an alternative plan will be made using the Geoforce Segmental Retaining Wall (GSRW) combined with soil nailing as a substitute for existing reinforcement. The stability of the excavation slopes without and with reinforced retaining walls is checked using the auxiliary program. Slopes must be stable against local sliding and overall sliding (overall stability). Likewise with the planning of strengthening retaining walls, it is necessary to check the strength of the strauss pile in receiving vertical loads and shear loads to withstand the overall stability of the slope. In addition, the influence of earthquake loads also needs to be considered considering that the project location is in an earthquake-prone area. GSRW planning is based on lateral earth pressure behind the GSRW; while the planning of soil nailing is based on shear load in maintaining the overall stability of the The results of the analysis show that the condition of the existing slope without reinforcement does not meet the overall slope stability plan requirements, so reinforcement is needed. The existing strengthening plan in the form of a retaining wall with a Strauss pile foundation with a diameter of 30 cm and a length of 6.0 m of 4 pieces per meter of wall length is stable. It's just that, if the earthquake load is included, the stability requirements have not been met; so it needs to be added to the strauss pile or an enlarged size. Planning on the left side with a gentle slope but deeper excavation requires additional reinforcement of 1 pile diameter of 30 cm. Whereas planning on the right side with steep slopes but shallower excavations requires additional reinforcement of 1 pile diameter of 45 cm. If the retaining wall is replaced with a GSRW with a panel size (width 165cm x height 140cm) and is pulled by 4 friction ties each 15 cm wide with a tensile strength of 30 kN/piece, then 4.5 m of friction ties are needed each. Soil nailing is planned to have a diameter of 15cm with varying amounts and lengths at each STA, depending on the amount of additional resistance moment (∆MR) required. In summary it can be explained that on the left slope it takes 3 pieces/meter of slope length with a total soil nailing length of 7.0 - 10.0 meters including a length of 2.0 - 4.0 meters long behind the landslide area. The slope on the right (steeper slope but shallower excavation) requires less soil nails, namely 1-2 pieces / meter long slope with a total soil nailing length of 4.0 - 7.0 meters including a length of 1.0 - 4.5 meters behind the landslide area. If the effects of earthquake loads are included, with the same design and amount of soil nailing, the plan safety requirements are met
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