YUNIAR, RISKA (2025) EVALUASI DESAIN DIAPHRAGM WALL PADA PROYEK MASS RAPID TRANSIT (MRT) (Studi Kasus: Stasiun Mass Rapid Transit Kota). S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
In the evaluation planning of diaphragm wall design at the Mass Rapid Transit City station, it is used for subway construction because it is one of the best innovations to overcome land limitation issues. Therefore, the objective of this study is to plan a retaining wall design that can withstand lateral pressure and deformation in accordance with the national standard limits. In this planning, Rankine's Theory is used to assess the stability of the wall against lateral soil pressure during the construction of the retaining wall. In this study, the diaphragm wall height was determined to be 39 m, which is sufficient to withstand pressure and seepage. Subsequently, modeling was conducted using Plaxis software, where the total deformation obtained at the final phase—the installation of strut 3 at an elevation of -23 m—was controlled with a maximum heave value of 18.8 mm and settlement of -16.1 mm. The deformation value obtained was 0.067%, which is smaller than the allowable limit of 0.5%. Therefore, no extreme deformation was found, indicating that the design of the wall and the stability of the excavation are adequate, along with the soil parameters and boundaries. Keywords: Lateral Pressure, Excavation Stability, Diaphragm Wall, Safety Factor, Deformation Dalam perencanaan evaluasi pada desain dinding diafragma atau Diaphragm Wall pada stasiun Mass Rapid Transit Kota digunakan untuk pembangunan kereta bawah tanah karena salah satu inovasi terbaik untuk mengatasi masalah keterbatasan lahan. Sehingga tujuan pada penelitian ini adalah merencanakan desain pada dinding penahan tanah yang cukup menahan tekanan lateral dan deformasi yang sesuai dengan batas izin dari standar nasional. Dalam perencanaan ini menggunakan Teori Rankine untuk kestabilan dinding terhadap tekanan tanah lateral pada pembangunan dinding penahan tanah. Dalam penelitian ini diperoleh ketinggian dinding diafragma sebesar 39 m yang dinyatakan sesuai untuk menahan tekanan dan menahan rembasan, setelah itu pemodelan menggunakan software Plaxis di mana deformasi total yang didapatkan pada fase akhir yaitu pemasangan strut 3 di elevasi -23 m nilai yang terkendali dengan nilai heave maksimum 18,8 mm dan settlement -16,1 mm. Pada nilai deformasi di dapat sebesar 0,067% di mana lebih kecil dari batas izin yaitu 0,5% maka, tidak ditemukan deformasi ekstrim maka dinyatakan perancangan dinding dan stabilitas galian cukup baik, serta parameter tanah dan boundary. Kata Kunci: Tekanan Lateral, Stabilitas Galian, Dinding Diafragma, Faktor Keamanan, Deformasi
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