SIMULASI PERBAIKAN TANAH LEMPUNG LUNAK DENGAN METODE STONE COLUMN Studi Kasus: Tangki Penyimpanan Kapasitas 10000 m3

Muhamad Akbar Afriandi, - and Herwan Dermawan, - (2025) SIMULASI PERBAIKAN TANAH LEMPUNG LUNAK DENGAN METODE STONE COLUMN Studi Kasus: Tangki Penyimpanan Kapasitas 10000 m3. S1 thesis, Universitas Pendidikan Indonesia.

Abstract

Tanah lempung lunak pada pondasi tangki kerap memicu penurunan total dan diferensial yang melampaui batas layanan, karena itu diperlukan perbaikan tanah yang andal. Studi ini mengevaluasi kinerja stone column pada fondasi tangki 10000 m³ menggunakan pemodelan numerik 3D berbasis data investigasi tanah lokal. Rancangan parametrik mencakup variasi panjang kolom (L 3, 9, 17, 19, 25 m), area replacement ratio (As 25% dan 35%), serta kekakuan kolom (Ec 35 dan 70 MPa). Analisis difokuskan pada kinerja penurunan (settlement performance), pola deformasi, dan distribusi tegangan untuk mengidentifikasi parameter dengan pengaruh signifikan. Hasil menunjukkan konfigurasi optimum L 17 m, As 35%, dan Ec 70 MPa dengan penurunan 0.139 m, lebih kecil dari syarat 0.15 m; dibanding kondisi unimproved 0.45 m, perbaikan ini setara dengan settlement improvement factor reduksi 69%. Secara mekanisme terjadi transisi deformasi dari punching (kolom pendek) menuju kombinasi punching – bulging (L mendekati ketebalan lapisan lunak, 17 m), hingga bulging dominan saat kolom menembus lapisan lunak, pada kondisi ini peran As dan Ec meningkat signifikan melalui tambahan kekangan lateral dan load sharing yang lebih merata antara kolom – tanah. Studi ini menegaskan bahwa penentuan L yang menyamai/lebih besar dari ketebalan lapisan lunak merupakan faktor kunci keberhasilan, sedangkan As dan Ec mengoptimalkan efisiensi perbaikan dan mengurangi risiko penurunan diferensial pada fondasi tangki di atas tanah lempung lunak. Soft clay soil at tank foundations often causes total and differential settlement that exceeds service limits, so reliable soil improvement is needed. This study evaluates the performance of stone columns in 10000 m³ tank foundations using 3D numerical modeling based on local soil investigation data. The parametric design includes variations in column length (L 3, 9, 17, 19, 25 m), area replacement ratio (As 25% and 35%), and column stiffness (Ec 35 and 70 MPa). The analysis focused on settlement performance, deformation patterns, and stress distribution to identify parameters with significant influence. Results indicate the optimal configuration of L 17 m, As 35%, and Ec 70 MPa with a settlement of 0.139 m, smaller than the requirement of 0.15 m; compared to the unimproved condition of 0.450 m, this improvement is equivalent to a settlement improvement factor of reduction 69%. Mechanistically, there is a transition in deformation from punching (short columns) to a combination of punching and bulging (L 17 m), until bulging becomes dominant when the column penetrates the soft layer. Under these conditions, the roles of As and Ec increase significantly through additional lateral restraint and more even load sharing between the column and the soil. This study confirms that determining L to be equal to or greater than the thickness of the soft layer is a key factor for success, while As and Ec optimize repair efficiency and reduce the risk of differential settlement in tank foundations on soft clay soil.

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Item Type:	Thesis (S1)
Additional Information:	https://scholar.google.com/citations?user=IcFO97YAAAAJ&hl=en ID SINTA Dosen Pembimbing: Herwan Dermawan: 6003810
Uncontrolled Keywords:	Area replacement ratio, Panjang kolom, Pola Deformasi, Settlement Improvement Factor, Stone column, Stress Concentration Ratio, Tanah lempung lunak Area replacement ratio, Column length, Deformation pattern, Settlement improvement factor, Soft clay soil, Stone column, Stress concentration ratio
Subjects:	L Education > L Education (General) T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Fakultas Pendidikan Teknik dan Industri > Jurusan Pendidikan Teknik Sipil > Program Studi Teknik Sipil
Depositing User:	Muhamad Akbar Afriandi
Date Deposited:	06 Oct 2025 13:19
Last Modified:	06 Oct 2025 13:19
URI:	http://repository.upi.edu/id/eprint/142122

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