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Andesta Granitio Irwan
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Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology

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PENERAPAN METODE Q-SLOPE DALAM PENILAIAN STABILITAS LERENG ALAMI Andesta Granitio Irwan; Danu Mirza Reky; Singgih Saptono
Prosiding Temu Profesi Tahunan PERHAPI 2020: PROSIDING TEMU PROFESI TAHUNAN PERHAPI
Publisher : PERHAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36986/ptptp.v0i0.138

Abstract

Metode analisis lereng menggunakan Q-slope dalam penilaian stabilitas suatu lereng sudah digunakan dalam lima tahun terakhir untuk memberikan rekomendasi sudut aman penggalian suatu lereng secara cepat dan efisien dengan menggunakan persamaan empirik. Penerapan metode ini dilakukan pada dua lokasi lereng breksi andesit alami dengan kondisi batuan lereng 1 fresh tanpa adanya longsoran dan kondisi lereng 2 sudah mengalami pelapukan serta adanya kenampakan longsoran blok baji.  Metode pengambilan data dilakukan pemetaan diskontinuitas pada lereng menggunakan garis bentangan dan pengambilan sampel batuan untuk pengujian sifat fisik dan mekanik batuan serta penilaian secara deskriptif untuk mendapatkan parameter input persamaan empirik Q-slope dengan validasi nilai faktor keamanan metode elemen hingga. Hasil plotting data pada grafik Q-slope menunjukkan rekomendasi sudut lereng Q-slope pada lokasi 1 lebih curam (85o) dibandingkan lereng aktual (30o) dengan kondisi lereng stabil, sedangkan sudut lereng rekomendasi Q-slope lokasi 2 lebih landai (68o) dibandingkan sudut lereng aktual di lapangan (79o) dengan kondisi lereng semi-stabil dan tidak stabil. Metode kesetimbangan batas dengan simulasi sudut lereng Q-slope dan sudut lereng aktual menunjukkan nilai faktor keamanan (SRF) lereng kedua lokasi penelitian yaitu lokasi 1 dengan sudut lereng aktual yaitu 3,3 dan Q-slope yaitu 2,11, sedangkan faktor keamanan (SRF) lokasi 2 yaitu 1 untuk sudut lereng aktual dan 1,17 untuk Q-slope. Hasil analisis metode Q-slope memberikan hasil yang relatif cepat dalam analisis lereng dengan metode numerik sebagai validasi menunjukkan keselarasan yang lebih kuantitatif dalam analisis faktor keamanan stabilitas suatu lereng.
Effect of Porosity on Uniaxial Compressive Strength in Sedimentary Rocks Andesta Granitio Irwan
PROMINE Vol 8 No 2 (2020): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/promine.v8i2.2057

Abstract

The rock strength parameter is an important factor used in determining the geotechnical design in determining the stability of the underground slope or mine. One of the rock strength tests in the laboratory (intact rock) is the uniaxial compressive strength test. One of the factors that influence rock strength is the porosity of the rock itself, especially in sedimentary rocks. The rock porosity test is carried out by testing the physical properties of the rock, then a regression analysis is carried out to obtain the correlation of the effect of porosity on rock strength and the correlation between porosity and absorption considered in the analysis. The linear regression results obtained between porosity and saturated water content of rocks showed a positive correlation where the increase in porosity, the saturated water content also increased. The correlation between porosity and uniaxial compressive strength obtained a strong correlation with the power regression model as the best model compared to other regression models because it has the lowest error based on the Root Mean Square Error (RMSE). The final result is obtained by comparing the effect of porosity on rock strength, that is the higher the porosity value have the smaller porosity, so that an increase in rock porosity will reduce the strength of the rock.
Perbandingan Perhitungan Sisa Cadangan Batu Granit Menggunakan Metode Cross Section Terhadap Metode Contour Pada PT Aditya Buana Inter Di Kabupaten Bangka Andesta Granitio Irwan; Irvani Irvani; Guskarnali Guskarnali
MINERAL Vol 3 No 1 (2018): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (340.123 KB) | DOI: 10.33019/mineral.v3i1.1573

Abstract

The calculation of the remaining reserves is one of the important things in the world of mining, especially in the mining business of granite. The importance of the calculation of reserves is used to determine the potential of granite stone resources in determining the amount of production of the company and the age of the company. For that many methods of calculating the reserves that can be used according to the type of minerals to be calculated the remaining reserves one of them using Cross Section Method and Contour Method. Field measurement used theodolith which further processing done by making contour map using Software Surpac 6.6.2. Processing using Minescape 4.119 Software for Cross Section Method with contour map iterval 1, 5, and 10 m and in division section with interval section 10, 15, and 20 m so as to obtain the width of field section, while Contour Method used contour elevation map that is 1, 5, and 10 m so as to obtain the area of ​​the field between the same elevation. After obtaining the area of ​​each method, use the frustum equation and mean area to determine the volume of surface reserves and from the volume results can be known the length of the mine life. The results obtained from the processing is the method of Cross Section largest reserve calculation value is at contour 1 m with the interval section 10 m that is equal to 5.662.168,28 m3 or 14.721.637,53 tons, while the Contour Method of the largest reserve value is at a contour interval of 1 m ie 4,871,332,59 m3 or 12,665,464,73 tons and for the age of the mine obtained using the highest reserve value in the Cross Section Method has a longer mine life of 42 years, while in Contour Method is 41 years.
Pengaruh Diskontinuitas Terhadap Kestabilan Lereng Batuan Terkekarkan Studi Kasus Kuari Andesit PT Lola Laut Timur Kabupaten Bogor Andesta Granitio Irwan; S. Koesnaryo; Barlian Dwinagara; Singgih Saptono
PROMINE Vol 9 No 2 (2021): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/promine.v9i2.2433

Abstract

Discontinuity in a rock mass has an influence on the stability of a rock slope because it is one of the controlling factors of slope failure. In this study, an analysis was carried out on the role of discontinuities, namely joints and lithic tuff layers on slope stability and the effect of persistent parameters and joint roughness on the safety factor of safety factor. The analysis used is the effect of changes in the thickness of the lithic tuff, persistence and the value of joint roughness on the value of the safety factor. Processing of slope stability data using Rocscience RS2 Software with Finite Element Method modeling with rock mass modeling used in the analysis, namely the Veneziano Model. The results showed that an increase in the thickness of the lithic tuff layer resulted in a decrease in the safety factor of the slope up to 1.37%. The effect of the persistence parameter on the slope safety factor was found that the higher the persistence value, the lower the slope safety factor value up to 2,9% and changes in the JRC value decreased the safety factor value up to 1,7%.
Co-Authors Barlian Dwinagara Danu Mirza Reky Guskarnali, Guskarnali Irvani Irvani S. Koesnaryo Singgih Saptono, Singgih