Perbandingan Pemakaian Metode Limit Equilibrium (LEM) 2D Dan 3D Terhadap Angka Keamanan Dan Jumlah Kebutuhan Perkuatan Lereng

Hapsari, Aisiyah Pramaisela (2024) Perbandingan Pemakaian Metode Limit Equilibrium (LEM) 2D Dan 3D Terhadap Angka Keamanan Dan Jumlah Kebutuhan Perkuatan Lereng. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Analisis stabilitas lereng sangat penting dilakukan pada perencaan timbunan agar aman dan tidak berpotensi terjadi kelongsoran. Saat ini metode yang paling sering digunakan untuk menganalisis stabilitas lereng adalah metode keseimbangan batas atau Limit Equilibrium Method (LEM) yang dapat dilakukan secara 2D dan 3D. Analisis stabilitas lereng dengan pemodelan 3D dianggap lebih sesuai untuk perencanan, hal ini dikarenakan bidang longor yang terjadi di lapangan adalah setempat dan tidak menerus sedangkan pemodelan 2D mengasumsikan bidang longsor yang terjadi memiliki panjang yang menerus. Analisis stabilitas lereng 2D dan 3D sebelumnya sudah banyak dilakukan oleh berbagai peneliti. Sebagian besar hasil dari penelitian sebelumnya menyatakan bahwa angka keamanan tiga dimensi 3D lebih besar dari pada angka keamanan 2D. Dimana sebagian besar penelitian sebelumnya menggunakan jenis tanah tertentu, sehingga hasil penelitian tersebut tidak dapat digunakan secara umum. Penelitian dengan menggunakan kondisi tanah berlapis yang general sudah pernah dilakukan, namun pada analisis 3D dilakukan secara manual dan tidak menghitung momen resistance. Di satu sisi, angka keamanan akan mempengaruhi jumlah kebutuhan perkuatan, dimana nilai angka keamanan yang didapatkan dari program bantu mungkin akan berbeda dengan nilai angka keamanan yang diperoleh secara manual sehingga jumlah kebutuhan perkuatan juga akan berbeda. Perbedaan jumlah kebutuhan perkuatan tersebut dapat menimbulkan adanya underestimate atau overestimate dalam desain. Berdasarkan permasalahan di atas, maka dilakukan analisis yang membandingkan nilai angka keamanan dan jumlah kebutuhan perkuatan antara hasil analisa permodelan 2D dan 3D pada timbunan diatas tanah lunak dengan konsistensi very soft, soft, dan medium. Analisa stabilitas lereng dilakukan menggunakan Limit Equilibrium Method (LEM). Analisa stabilitas lereng 2D dan 3D menggunakan program bantu Plaxis LE. Perbandingan jumlah perkuatan dalam penelitian ini menggunakan perkuatan geotextile. Hasil yang diperoleh dari penelitian ini adalah angka keamanan 2D lebih kritis daripada faktor keamanan 3D. Rasio faktor keamanan 3D dan 2D berkisar antara 1,002 hingga 1,862. Jumlah kebutuhan perkuatan 3D lebih sedikit dibandingkan jumlah kebutuhan perkuatan 2D dengan rasio perbedaan 0 hingga 0,722. Sehingga dapat disimpulkan analisis stabilitas lereng dengan pendekatan 2D sudah dapat mewakili bidang longsor 3D
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Slope stability analysis is very important in planning embankments so that they are safe and do not have the potential for landslides to occur. Currently the method most often used to analyze slope stability is the Limit Equilibrium Method (LEM) which can be done in 2D and 3D. Slope stability analysis using 3D modeling is considered more suitable for planning, this is because the landslide field that occurs in the field is local and not continuous, whereas 2D modeling assumes that the landslide field that occurs has a continuous length. 2D and 3D slope stability analyzes have previously been carried out by various researchers. Most of the results from previous research state that the 3D three-dimensional safety figure is greater than the 2D safety figure. Where most previous research used certain types of soil, so the results of this research cannot be used in general. Research using general layered soil conditions has been carried out, but the 3D analysis was carried out manually and did not calculate the moment of resistance. On the one hand, the safety figure will influence the amount of reinforcement required, where the safety figure value obtained from the auxiliary program may be different from the safety figure value obtained manually so that the amount of reinforcement required will also be different. Differences in the amount of reinforcement required can lead to underestimation or overestimation in the design. Based on the problems above, an analysis was carried out comparing the safety figures and the amount of reinforcement required between the results of 2D and 3D modeling analysis of embankments on soft soil with very soft, soft and medium consistencies. Slope stability analysis was carried out using the Limit Equilibrium Method (LEM). 2D and 3D slope stability analysis using the Plaxis LE program. Comparison of the amount of reinforcement in this study uses geotextile reinforcement. The results obtained from this research are that 2D safety factors are more critical than 3D safety factors. The ratio of 3D and 2D safety factors ranges from 1.002 to 1.862. The number of 3D reinforcement requirements is less than the number of 2D reinforcement requirements with a difference ratio of 0 to 0.722. So it can be concluded that slope stability analysis using a 2D approach can represent the 3D landslide field

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Faktor Keamanan, Limit Equilibrium Method (LEM), Perkuatan Geotextile, Stabilitas Lereng 2D, Stabilitas Lereng 3D; Safety Factors, Limit Equilibrium Method (LEM), Geotextile Reinforcement, 2D Slope Stability, 3D Slope Stability
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA455.S6 Soil (Materials of engineering and construction)
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	Aisiyah Pramaisela Hapsari
Date Deposited:	02 Feb 2024 07:12
Last Modified:	02 Feb 2024 07:12
URI:	http://repository.its.ac.id/id/eprint/105973

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