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Tien Veny Vera
Universitas Pembangunan Nasional Veteran Yogyakarta
Earth & Planetary Sciences Environmental Science Materials Science & Nanotechnology Mathematics Physics

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Analisis Fraktal Untuk Menentukan Kuat Geser Batuan Sedimen di Kabupaten Ende - Lianunu Provinsi Nusa Tenggara Timur - Indonesia Tien Veny Vera; Sari B Kusumayudha; Singgih Saptono; Kurniawan Kurniawan
Jurnal Geomine Vol 11, No 1 (2023): April 2023
Publisher : Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33536/jg.v11i1.1372

Abstract

Rock surface roughness is an important parameter used in calculating the shear strength of rocks, both of which greatly affect the stability of a slope. In this research, direct shear strength testing was carried out on 5 sedimentary rocks to obtain the value of cohesion and internal friction angle. The research objectives include (1) Calculating the fractal dimension (D), joint roughness coefficient (JRC), and rock shear strength. (2)Analysis of rock shear strength calculation results from rock direct shear test results. To determine the fractal dimension using the box-counting method in ImageJ FracLac software. The factual D and JRC are two interrelated parameters, where the higher of D value, will increase the JRC value, this is influenced by the grain size. In the fine grain size sample, the D values ranged 1.0034-1.0045, medium grain size 1.0057, and coarse grain size 1.0084-1.0085. Calculations with the new equation, the JRC values in the samples S1 (8-10), S2 (12-14), S3 (4-6), S4 (12-14), and S5 (6-8). The comparison of graphs shows a pattern that is almost similar to previous researchers. The difference in the value of shear strength is influenced by the level of rock surface roughness using fractal dimensions provides a higher detail value. By using statistical analysis (RMSE and MAD), it shows a small error value, namely the results of the research which have the lowest RMSE (0.14) and MAD (0.11) values, meaning the results of calculations using fractal dimensions are correlated with the measured data from the laboratory shear test. 
Fractal analysis to determine JRC on sandstones and its correlation to SRF, Ende-Lianunu Regency, East Nusa Tenggara Province, Indonesia Tien Veny Vera; Sari Bahagiarti Kusumayudha; Singgih Saptono; Kurniawan Kurniawan
International Journal of Advances in Applied Sciences Vol 12, No 3: September 2023
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijaas.v12.i3.pp214-225

Abstract

The study area is located in Ende-Lianunu Regency, East Nusa Tenggara Province, Indonesia, with mountainous and hilly morphology, and is part of the Kiro Formation which is composed of tuffaceous sandstones. Discontinuities in the sandstone are in the form of bedding planes and joints, which affect the mechanical properties of the rock mass, reduce its strength, and affect slope stability. The discontinuity condition that affects mechanical behavior is surface roughness. This research aims to define the fractal dimension value of surface roughness using a box-counting method, joint roughness coefficient (JRC), and simulate the strength reduction factor (SRF) value on slopes that have a certain JRC. The fractal dimension of fine-grained samples = 1.0010 and coarse-grained = 1.0056. The average JRC value is 6.25 (Range 4-6). Simulation at JRC 0-20, gives different SRF values. On slopes with JRC = 0, the critical SRF = 1.35. If JRC = 20, the critical SRF = 1.47. It can be inferred, that the fractal dimension of the roughness of the sliding plane correlates with JRC and SRF. As the fractal dimension value increases, so do the JRC and SRF values, resulting in more stable slope conditions.
Co-Authors Kurniawan Kurniawan Kurniawan Kurniawan Sari B Kusumayudha Sari Bahagiarti Kusumayudha Singgih Saptono, Singgih