Analisis Stabilitas Tanah Timbunan Yang Tanah Dasarnya Distabilisasi Menggunakan Fly Ash dan Fosroc Cebex-100 Dengan Metode Finite Element (Studi Kasus : Jalan Lingkar Utara, Kab. Lamongan, Jawa Timur)

Rahma, Farah Salsabila (2025) Analisis Stabilitas Tanah Timbunan Yang Tanah Dasarnya Distabilisasi Menggunakan Fly Ash dan Fosroc Cebex-100 Dengan Metode Finite Element (Studi Kasus : Jalan Lingkar Utara, Kab. Lamongan, Jawa Timur). Undergraduate thesis, UPN Veteran Jawa Timur.

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Abstract

The North Ring Road Project in Lamongan Regency, East Java, involves swamp soil conditions with high mineral content. Swamp soil tends to be soft, and embankment construction for road bodies in such areas poses potential risks, such as landslides or significant settlements. Therefore, subgrade stabilization is necessary to enhance the soil's stability and its ability to bear loads. This study focuses on soil improvement by adding Fly Ash and Fosroc Cebex-100 as additives to enhance the strength and binding properties of soft soil. Fly Ash, in addition to serving as a soil stabilizer, also supports the utilization of coal waste. Meanwhile, Fosroc Cebex-100 enhances soil stability by filling the soil's pores. This research utilizes the Finite Element Method (FEM) with the help of the Plaxis software to analyze Safety Factor and Settlement values, as well as simulate soil behavior before and after adding Fly Ash and Fosroc Cebex-100. The parameters used in the analysis include unit weight, cohesion, internal friction angle, elastic modulus, and Poisson's ratio. The research results indicate that the Safety Factor of the original soil condition is 1.15 (<1.5 permissible SF), which is considered unsafe. After the addition of Fly Ash and Fosroc Cebex-100, the Safety Factor significantly increases to 1.89 (20% FA + 0.45% Cb), 1.90 (25% FA + 0.45% Cb), and 1.90 (30% FA + 0.45% Cb), which are deemed safe (>1.5 permissible SF). For settlement values, the original soil condition results in 3.34 cm/year (not meeting the U90% <2 cm/year criteria). After the addition of Fly Ash and Fosroc Cebex-100, the settlement values are reduced to 1.82 cm/year (20% FA + 0.45% Cb), 1.77 cm/year (25% FA + 0.45% Cb), and 1.97 cm/year (30% FA + 0.45% Cb). The optimum composition is achieved with a variation of 25% FA + 0.45% Cb, resulting in a Safety Factor of 1.90 and the lowest settlement value of 1.77 cm/year compared to other composition variations. Keywords: Subgrade Stabilization, Fly Ash, Fosroc Cebex-100, FEM, Safety Factor, Settlement.

Item Type:

Thesis (Undergraduate)

Contributors:

Contribution	Contributors	NIDN/NIDK	Email
Thesis advisor	Firmansyah, Yerry Kahaditu	NIDN0029018601	yerry.kahaditu.ts@upnjatim.ac.id
Thesis advisor	Farichah, Himatul	NIDN0726129301	himatul.farichah.ts@upnjatim.ac.id

Subjects:

T Technology > TA Engineering (General). Civil engineering (General)

Divisions:

Faculty of Engineering > Departement of Civil Engineering

Depositing User:

Farah Salsabila Rahma

Date Deposited:

03 Sep 2025 06:10

Last Modified:

03 Sep 2025 06:10

URI:

https://repository.upnjatim.ac.id/id/eprint/33958