ANALISIS KESTABILAN LERENG URUGAN YANG DIPERKUAT DENGAN SISTEM MSE (MECHANICALLY STABILIZED EARTH) TESIS Oleh: YANDA MUFTI NIM: 22120311 (Program Studi Magister Rekayasa Pertambangan) INSTITUT TEKNOLOGI BANDUNG September 2023
]� � ABSTRAK ANALISIS KESTABILAN LERENG URUGAN YANG DIPERKUAT DENGAN SISTEM MSE (MECHANICALLY STABILIZED EARTH) Oleh: YANDA MUFTI NIM: 22120311 (Program Studi Magister Rekayasa Pertambangan) Analisis kestabilan lereng tambang merupakan suatu kegiatan untuk mengevaluasi kondisi kestabilan serta unjuk kerja suatu lereng. Kajian kestabilan lereng pada area penelitian diperlukan untuk menentukan nilai faktor keamanan (FK) lereng dengan sistem perkuatan yang digunakan berupa Mechanically Stabilized Earth (MSE). Dinding tanah yang distabilkan secara mekanis (MSE) biasanya digunakan struktur untuk mempertahankan timbunan atau tanah urugan yang dapat digunakan pada infrastruktur di tambang, jembatan, jalan raya dan berbagai jenis infrastruktur lainnya. Penelitian ini dilakukan pada proyek filtration plant di site Martabe, Dinding-dinding ini dibangun dari bawah ke atas dengan menempatkan bergantian lapisan tanah dan tulangan. Analisis kestabilan dinding atau lereng urugan yang diperkuat menggunakan MSE ini secara konseptual memiliki perhitungan faktor keamanan yaitu FS = {(Resisting Force + Reinforcement Loads)/(Driving Force). Menentukan nilai faktor keamanan lereng urugan dengan sistem MSE dapat dianalisis secara empiris berdasarkan metode numerik dari Finite Element Method (FEM) dan Limit Equilibrium Method (LEM) dengan parameter input material properties, soil properties, reinforcement properties dari hasil pengujian UCS di laboratorium dan dari laporan geoteknik investigasi di area penelitian. Hasil dari analisis data pada penelitian ini diperoleh nilai FK dengan metode bishop yaitu 2.3 dan metode janbu 2.1. Dinding MSE dapat dikategorikan dalam keadaan stabil dengan nilai kritikal SRF yaitu 2.4 dengan nilai horizontal displacement dari hasil pemodelan numerik sebesar 154 mm, dan nilai horizontal displacement dari pengukuran dilapangan yaitu 160 mm. Kata kunci: Faktor keamanan, kestabilan lereng, mechanically stabilized earth, strength reduction factor. � �
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]� � ABSTRACT � ANALYSIS OF REINFORCED SOIL SLOPE WITH MSE (MECHANICALLY STABILIZE EARTH) SYSTEM By: YANDA MUFTI NIM: 22120311 (Magister Program in Mining Engineering) Slope stability analysis involves evaluating the stability condition and performance of a slope. Conducting a slope stability study in the research area is necessary to determine the safety factor (FoS) value of the slope when using the Mechanically Stabilised Earth (MSE) reinforcement system. Mechanically stabilized earth walls (MSE) are typically employed to provide structural support for embankments or earthworks in infrastructure projects such as mines, bridges, and highways. This study was conducted at the filtration plant project on the Martabe site. The walls were constructed using a layering technique, with alternating layers of soil and reinforcement applied from the base upwards. Analysis of the stability of reinforced walls or reinforced slopes using Mechanically Stabilized Earth (MSE) conceptually has a safety factor calculation. This is expressed as FoS = {(Resisting Force + Reinforcement Loads)/(Driving Force)}. Determining the safety factor value for embankment slopes through the MSE system involves empirical analysis using the numerical methods of the Finite Element Method (FEM) and the Limit Equilibrium Method (LEM). Input parameters include material properties, soil properties, and reinforcement properties that were obtained from UCS test findings in the laboratory and from the reports on geotechnical investigations in the research area. The FoS value found from bishop’s method was 2.3 and the Janbu method 2.1 in the data analysis of this study. The MSE wall is deemed stable at a critical SRF value of 2.4 with a displacement of 154 mm from numerical modeling and 160 mm from field measurements horizontally.