Hakim, Arief Rachman (2025) Analisis Perencanaan Pondasi Dan Konstruksi Penahan Tanah Eksisting Serta Perencanaan Alternatifnya Pada Konstruksi Underpass Ahmad Yani Surabaya. Diploma thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Kepadatan penduduk Surabaya menimbulkan terjadinya kemacetan di Jalan Ahmad Yani sehingga mendorong rencana pembangunan sebuah underpass sepanjang 450 meter dengan metode open-cut. Lokasi konstruksi menghadapi tantangan teknis berupa tanah lembek dengan daya dukung rendah, ditandai dengan nilai SPT < 10. Konstruksi underpass direncanakan dengan menggunakan pondasi berupa spun pile serta konstruksi penahan tanah berupa secant pile. Perencanaan pondasi akan dievaluasi terhadap daya dukung tiang dalam kelompok, ketahanan terhadap defleksi, ketahanan terhadap momen, serta ketahanan terhadap gaya geser. Sedangkan perencanaan konstruksi penahan tanah akan dievaluasi terhadap stabilitas dan keamanannya secara keseluruhan. Pada tugas akhir ini, perencanaan pondasi spun pile eksisting akan dibandingkan dengan perencanaan pondasi bored pile sebagai alternatif. Di sisi lain, perencanaan secant pile eksisting akan dibandingkan dengan perencanaan turap sebagai alternatif. Didapatkan hasil bahwa perencanaan pondasi spun pile eksisting dengan diameter 40 cm sudah aman untuk menahan beban tunnel serta aman terhadap gaya uplift yang bekerja. Perencanaan pondasi spun pile eksisting juga memiliki biaya material yang lebih efisien daripada perencanaan alternatif pondasi bored pile dengan diameter 60 cm. Di lain sisi, perencanaan penahan tanah secant pile eksisting dengan diameter 80 cm juga sudah aman untuk menjaga stabilitas lereng pada galian, bahkan perencanaan secant pile eksisting juga memiliki biaya material yang jauh lebih efisien daripada perencanaan alternatif turap baja sebagai penahan tanah pada konstruksi underpass Ahmad Yani, Surabaya.
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The population density of Surabaya has caused traffic congestion on Jalan Ahmad Yani, leading to the planning for the construction of a 450-meter underpass using the open-cut method. The construction faces technical challenges, including wet soil with low bearing capacity which indicated by SPT values lower than 10. To support the underpass, spun pile and secant piles have been planned as foundation and retaining structures. The foundation design will be evaluated to its bearing capacity in group, its resistance to deflection, bending moments, and its resistance to shear forces. Meanwhile the retaining structure design will be evaluated to its overall stability failure. This final project compares the existing spun pile design and alternative bored pile design. On the other hand, the existing secant pile will be compared to the alternative retaining wall design. The results indicate that the design of the existing spun pile foundation with a diameter of 40 cm is safe to support the tunnel loads and is also secure against the acting uplift forces. Furthermore, the existing spun pile foundation design demonstrates more cost- efficient material usage compared to the alternative bored pile foundation design with a diameter of 60 cm. On the other hand, the design of the existing secant pile retaining wall with a diameter of 80 cm is also proven to be safe in maintaining slope stability during excavation. Moreover, the existing secant pile design offers significantly more efficient material costs compared to the alternative design using steel sheet piles as the retaining structure for the Ahmad Yani underpass construction in Surabaya.
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