Kajian Pengaruh Geometri Terhadap Penurunan Dan Stabilitas Lereng Tanggul “V” Pada Kawasan Industri “X”

Prafitri, Devinta Millenia (2021) Kajian Pengaruh Geometri Terhadap Penurunan Dan Stabilitas Lereng Tanggul “V” Pada Kawasan Industri “X”. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Tanggul “V” memiliki suatu lereng hasil timbunan tubuh tanggul dan terdapat material tanah dasar yang didominasi tanah lunak. Apabila tanah lunak tersebut dikenakan suatu beban, maka akan terjadi penurunan yang cukup besar karena salah satu sifatnya yaitu memiliki kompresibilitas yang tinggi. Besar kompresibilitas tersebut dipengaruhi oleh besar angka pori pada tanah lunak. Tanggul terdiri dari dua section, yaitu section A (ketinggian 6 m dan kemiringan lereng 1:2 dan 1:7) dan section B (ketinggian 4,5 m dan kemiringan lereng 1:2 dan 1:5). Penelitian bertujuan untuk mengetahui pengaruh geometri tanggul terhadap besar penurunan pada tanah lunak dan stabilitas lereng tanggul. Analisis penurunan ditinjau pada besar penurunan konsolidasi primer berdasarkan teori konsolidasi 1D Terzaghi. Untuk analisis kestabilan lereng dilakukan berdasarkan finite element method (FEM). Didapatkan hasil bahwa terjadi penurunan pada section A sebesar 2,46 m dan pada section B sebesar 2,28 m dengan waktu konsolidasi 90% kedua section sebesar 41,29 tahun. Section A memiliki penurunan yang lebih besar dibandingkan dengan section B karena faktor tinggi dan luas timbunan yang besar mengakibatkan tegangan tambahan yang diterima oleh tanah dasar semakin besar. Hubungan antara besar penurunan konsolidasi dengan besar porositas tanah yaitu semakin besar porositas (angka pori) tanah, kompresibilitas tanah semakin tinggi dan penurunan konsolidasi yang terjadi semakin besar. Hasil kestabilan lereng tanggul menunjukkan section A dan B termasuk dalam kategori aman. Nilai faktor keamanan pada section A sebesar 1,78 dengan perpindahan total 0,381 m dan faktor keamanan pada section B sebesar 2,3303 dengan perpindahan total 0,230 m. Perbedaan nilai faktor keamanan pada kedua section tidak dapat dibandingkan secara langsung karena kedua section memiliki dasar geometri yang berbeda. Didapatkan nilai FK dan penurunan sesudah konsolidasi lebih besar dibandingkan dengan sebelum konsolidasi yaitu 1,912 pada section A dengan penurunan sebesar 1,26 m dan 2,4033 pada section B dengan penurunan sebesar 0,437 m. Hal tersebut terjadi karena pengaruh proses disipasi tekanan air pori yang mengakibatkan tegangan efektif tanah meningkat. ==================================================================================================== Embankment "V" has a slope from the result of a pile embankment body and has a subgrade material dominated by soft soil. If a load is applied to the soft soil surface, there will be a considerable settlement because one of its characteristics has high compressibility. The compressibility of soil is influenced by the value of soft soil void ratio. The embankment consists of two sections. Section A with a height of 6 m has a graded slope 1:2 and 1:7. Section B with a height of 4.5 m has a graded slopes 1:2 and 1:5. This study aimed to determine the effect of embankment geometry on the amplitude of settlement in soft soil and the stability of the embankment slope. The settlement analysis is reviewed on the amplitude of the primary consolidation settlement based on Terzaghi's 1D consolidation theory. The slope stability analysis was carried out based on the finite element method (FEM). The results showed that the amplitude of settlement in section A is 2.46 m and section B is 2.28 m by consolidation time of 90% for both sections is 41.29 years. Section A has a greater consolidation settlement amplitude than section B. It is caused by a large total of both height and area embankment that result in larger stresses increase received by the subgrade material. The relationship between the consolidation settlement and the porosity of the soil is the greater the porosity (void ratio) of the soil, the higher compressibility can be, which caused substantial consolidation settlement to have occurred. The results of slope stability analysis showed that sections A and B were included in the safe category. The safety factor value in section A is 1.78 with a total displacement of 0.381, and a safety factor in section B is 2.3303 with a total displacement of 0.230 m. The difference in the value of the safety factor in the two sections cannot be compared directly because the two sections have different basic geometries. The safety factor value and the settlement amplitude after consolidation were higher than before the consolidation process, with a safety factor value of 1.912 in section A with a soil settlement of 1.26 m and 2.4033 in section B with a soil settlement of 0.437 m. It can occur due to the influence of the process on pore water dissipation which causes the effective stress of the soil to increase.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Geometri, Penurunan Konsolidasi, Stabilitas Lereng, Geometry, Consolidation Settlement, Slope Stability
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA169.5 Failure analysis
T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method
T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization
Divisions: Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User: Devinta Millenia Prafitri
Date Deposited: 26 Aug 2021 03:08
Last Modified: 26 Aug 2021 03:08
URI: https://repository.its.ac.id/id/eprint/89506

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