Analisis Penyebab Kebocoran Dinding Diafragma Pada Proyek MRTJ Fase 2A CP202 Stasiun Mangga Besar Dan Rekomendasi Desain Ulang

Noufal, Dhafin Ahmad (2026) Analisis Penyebab Kebocoran Dinding Diafragma Pada Proyek MRTJ Fase 2A CP202 Stasiun Mangga Besar Dan Rekomendasi Desain Ulang. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Jakarta sebagai Ibu Kota Negara mengalami perkembangan pesat dalam pembangunan infrastruktur akibat kepadatan penduduk yang terus meningkat, yang menimbulkan dua masalah krusial yaitu keterbatasan lahan dan kemacetan lalu lintas. Pembangunan transportasi bawah tanah, seperti Mass Rapid Transit Jakarta (MRTJ) Fase 2A, menjadi solusi strategis untuk mengatasi permasalahan tersebut. Pada pelaksanaan konstruksi Stasiun Mangga Besar yang menggunakan metode top-down dengan dinding diafragma sebagai struktur penahan tanah, ditemukan kebocoran air tanah (seepage) pada 233 titik berbeda. Tugas akhir ini bertujuan menganalisis penyebab kebocoran dan perilaku defleksi pada dinding diafragma eksisting, serta merencanakan ulang dinding diafragma yang aman ditinjau dari kestabilan, kekuatan, dan defleksi. Analisis dilakukan menggunakan data sekunder dan program bantu SAP2000 dengan pendekatan beam on elastic foundation untuk setiap tahap penggalian. Hasil analisis menunjukkan bahwa dinding diafragma eksisting dengan tebal 1,2 m dan kedalaman 43 m mengalami defleksi maksimum sebesar 0,0665 m dan momen maksimum sebesar 603,69 tonm, yang ternyata melampaui kapasitas momen penampangnya sebesar 447,28 tonm, kondisi inilah yang teridentifikasi sebagai penyebab utama terjadinya kebocoran. Sebagai rekomendasi, direncanakan dinding diafragma baru dengan tebal 1,4 m dan kedalaman 56 m, yang menghasilkan defleksi maksimum lebih kecil yaitu 0,046 m serta momen maksimum 585,31 tonm yang masih berada di bawah kapasitas momen rencana sebesar 617,62 tonm, sehingga memenuhi syarat keamanan struktur. Hasil tugas akhir ini diharapkan dapat menjadi referensi perencanaan dinding penahan tanah yang aman serta alternatif solusi bagi proyek dengan permasalahan serupa di masa mendatang.
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Jakarta, as the capital city of Indonesia, has experienced rapid infrastructure development driven by its continuously increasing population density, which has given rise to two critical issues: limited land availability and traffic congestion. The construction of underground transportation facilities, such as the Jakarta Mass Rapid Transit (MRTJ) Phase 2A, has become a strategic solution to address these problems. During the construction of Mangga Besar Station, which employed the top-down method with a diaphragm wall as the retaining structure, groundwater leakage (seepage) was identified at 233 different locations. This final project aims to analyze the causes of the leakage and the deflection behavior of the existing diaphragm wall, as well as to redesign the diaphragm wall to ensure safety in terms of stability, strength, and deflection. The analysis was carried out using secondary soil data and SAP2000 software based on the beam on elastic foundation approach for each excavation stage. The results show that the existing diaphragm wall with a thickness of 1.2 m and a depth of 43 m experienced a maximum deflection of 0.0665 m and a maximum bending moment of 603.69 tonm, which exceeded its moment capacity of 447.28 tonm, this condition was identified as the primary cause of the leakage. As a recommendation, a new diaphragm wall with a thickness of 1.4 m and a depth of 56 m was designed, resulting in a smaller maximum deflection of 0.046 m and a maximum moment of 585.31 tonm, which remains below its design moment capacity of 617.62 tonm, thus satisfying the structural safety requirements. The results of this final project are expected to serve as a reference for the design of safe retaining walls and as an alternative solution for projects facing similar issues in the future.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Dinding Diafragma, Defleksi, SAP2000, Diaphragm Wall, Deflection, SAP2000
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA760+ Retaining walls
Divisions:	Faculty of Civil Engineering and Planning > Civil Engineering > 22201-(S1) Undergraduate Thesis
Depositing User:	Dhafin Ahmad Noufal
Date Deposited:	28 Jul 2026 08:12
Last Modified:	28 Jul 2026 08:12
URI:	http://repository.its.ac.id/id/eprint/138948

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