Analisis Tanah Hasil Galian Yang Distabilisasi Slag Baja Dan Kapur Sebagai Bahan Timbunan Pada Struktur Jalan Tol Serang - Panimbang Seksi III

Dika, Muhammad Fachrurrokhman (2026) Analisis Tanah Hasil Galian Yang Distabilisasi Slag Baja Dan Kapur Sebagai Bahan Timbunan Pada Struktur Jalan Tol Serang - Panimbang Seksi III. Masters thesis, Institut Teknologi Sepuluh November.

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Abstract

Pembangunan Jalan Tol Serang-Panimbang Seksi III dihadapkan pada permasalahan geoteknik dan lingkungan yang krusial. Penelitian ini dilatarbelakangi surplus material galian bervolume lebih dari satu juta meter kubik, yang didominasi oleh clay shale dari Formasi Bojong, sementara di lain sisi terdapat defisit kebutuhan material timbunan sebesar hampir 1,2 juta meter kubik. Hal ini memaksa pembukaan borrow area baru yang menimbulkan dampak kerusakan lingkungan ganda. Tujuan utama penelitian ini adalah untuk menganalisis secara komprehensif pemanfaatan tanah hasil galian sebagai material timbunan yang andal melalui metode stabilisasi kimia menggunakan kombinasi slag baja dan kapur, serta menganalisis perilakunya saat diaplikasikan di lapangan. Metodologi penelitian dilakukan melalui eksperimen laboratorium dan dilanjutkan dengan simulasi numerik. Penentuan komposisi optimum dilakukan dalam dua tahap: pertama, mencari kadar CaCO3 optimum pada variasi 6%, 7%, dan 8%; kedua, mencari campuran optimum, dengan variasi rasio slag baja terhadap campuran tanah-CaCO3 optimum sebesar 10%, 25%, dan 40%. Setiap variasi diuji dengan Standard Proctor dan CBR untuk mendapatkan komposisi paling efektif. Komposisi optimum final kemudian diuji parameter Kuat Tekan Bebas (UCS), termasuk sifat fisik campurannya. Parameter yang dihasilkan digunakan untuk memodelkan dan menganalisis aplikasi timbunan terhadap stabilitas lereng menggunakan PLAXIS 2D. Hasil penelitian menunjukkan tanah asli diklasifikasikan sebagai lempung dengan plastisitas tinggi (CH) dengan nilai CBR soaked sangat rendah (0,541%) dan Indeks Plastisitas yang tinggi sebesar 61,18%. Tahap pertama menetapkan kadar CaCO3 6% sebagai kadar optimum yang mampu meningkatkan CBR menjadi 1,901%. Pada tahap kedua, rasio 40% slag baja memberikan kinerja terbaik dengan meningkatkan nilai CBR hingga 2,560% dan kepadatan kering maksimum menjadi 1,641 gr/cm3. Berdasarkan analisis stabilitas, timbunan tanah asli (100ES) mengalami keruntuhan prematur bahkan hanya dengan beban berat sendiri. Timbunan tanah terstabilisasi dengan Komposisi Campuran Optimum ((ES+Opt.C)+40%SS) pada kemiringan 1:2 terbukti aman hingga ketinggian 8,0 m dengan nilai SF > 1,5, sementara pada kemiringan 1:1 hanya aman hingga ketinggian 2,0 m. Penelitian ini menetapkan komposisi (ES+Opt.C)+40%SS sebagai campuran optimum yang secara signifikan memperbaiki properti teknis tanah melalui mekanisme interlocking mekanis butiran slag baja. Meskipun nilai CBR akhir belum mencapai target 6% yang disyaratkan Bina Marga, material ini layak digunakan untuk seluruh ketinggian yang diuji pada kemiringan landai (1:2).
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The construction of the Serang–Panimbang Toll Road Section III is facing a critical geotechnical and environmental challenges. This study is motivated by a surplus of excavation material exceeding one million cubic meters, predominantly composed of clay shale from the Bojong Formation, while simultaneously facing a deficit of approximately 1.2 million cubic meters of embankment material. This imbalance has necessitated the opening of new borrow areas, resulting in compounded environmental degradation. The primary objective of this research is to evaluate the utilization of excavated soil as a reliable embankment material through chemical stabilization using a combination of steel slag and lime, as well as to analyze its behavior when applied under field conditions. The research methodology consists of laboratory experiments followed by numerical simulations. The determination of the optimum mixture was conducted in two stages. First, the optimum CaCO₃ content was evaluated at variations of 6%, 7%, and 8%. Second, the optimum mixture was identified by varying the steel slag proportion relative to the optimum soil–CaCO₃ mixture at 10%, 25%, and 40%. Each mixture was tested using the Standard Proctor and CBR tests to determine the most effective composition. The final optimum mixture was further evaluated through Unconfined Compressive Strength (UCS) testing and physical property characterization. The resulting parameters were then used to model and analyze embankment applications and slope stability using PLAXIS 2D. The results indicate that the natural soil is classified as high-plasticity clay (CH), exhibiting a very low soaked CBR value of 0.541% and a high Plasticity Index of 61.18%. In the first stage, a CaCO₃ content of 6% was identified as optimum, increasing the CBR value to 1.901%. In the second stage, a steel slag ratio of 40% provided the best performance, increasing the CBR value to 2.560% and the maximum dry density to 1.641 g/cm³. Stability analysis revealed that the embankment constructed from untreated soil (100ES) experienced premature failure under self-weight loading alone. In contrast, the stabilized embankment with the Optimum Mixture Composition ((ES + Opt.C) + 40%SS) at a slope inclination of 1:2 remained stable up to a height of 8.0 m with a safety factor (SF) greater than 1.5, whereas at a slope inclination of 1:1, stability was only maintained up to a height of 2.0 m. This study establishes the (ES + Opt.C) + 40%SS composition as the optimum mixture, which significantly improves the technical properties of the soil through mechanical interlocking mechanisms provided by steel slag particles. Although the final CBR value did not reach the 6% requirement stipulated by Bina Marga, the stabilized material is considered suitable for use across the tested embankment heights under gentle slope conditions (1:2).

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	CaCO₃, Clay shale, PLAXIS 2D, Stabilisasi Kimia Tanah, Slag Baja, Stabilitas Lereng CaCO₃, Chemical Soil Stabilization, Clay Shale, PLAXIS 2D, Slope Stability, Steel Slag
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA418.16 Materials--Testing. T Technology > TA Engineering (General). Civil engineering (General) > TA455.S6 Soil (Materials of engineering and construction) T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	Muhammad Fachrurrokhman Dika
Date Deposited:	23 Jan 2026 09:39
Last Modified:	23 Jan 2026 09:39
URI:	http://repository.its.ac.id/id/eprint/130276

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