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All Journal Journals Mining Engineering : Bina Tambang
Ilep Prengki
Universitas Negeri Padang
Earth & Planetary Sciences

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Analisis Beban Runtuh dan Evaluasi Lubang Bukaan Berdasarkan Metode Rock Mass Rating dan Q-System pada Tambang Bawah Tanah CV. Bara Mitra Kencana, Kota Sawahlunto, Sumatera Barat Ilep Prengki; Bambang Heriyadi
Journals Mining Engineering : Bina Tambang Vol 3, No 4 (2018): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (967.222 KB) | DOI: 10.24036/bt.v3i4.102293

Abstract

Abstract.The excavation of a underground rock mass resulting a change in the balance of rock conditions such as the occurrence of rock collapse and changes in the dimensions of tunnel as a result of the displacement of the voltage distribution. It is desirable to have a good geotechnical analysis to provide an appropriate treatment of rocks excavated. This research was conducted to determine rock mass class, rock strength at BMK 34 CV Bara Mitra Kencana. Classification of  rocks mass with RMR system And Q-System FK potential of wedge  using unwedge software. From the measurement of several parameters of RMR method,  RMR value of  48 ( Coal) and  60 (Sillstone) is obtained where as rock mass class III (fair rock), based on  the Q-System obtained a value of 14 in class II for coal and 4 Class III for Sillstone. Based on the RMR-system classification, the value for span maximum is 3 m with a collapse time of 110 hours and the value of the load collapses is 1,56 tons / m2. Based on the Undwedge Software processing, there was an increase in FK values for both methods, Based  on Support RMR Ground from 1,907 to 2,939 and Based on Ground Support Q-System from 1,907 to 2,078.Keywords : Underground, Rock Mass Ratting, Q-System, Safety Factor, Ground Support
Hubungan Kuat Tekan Uniaksial dan Kuat Tarik Tidak Langsung Pada Batuan Sedimen Dengan Nilai Kuat Tekan Rendah Rizto Salia Zakri; Ilep Prengki; Tri Gamela Saldy
Journals Mining Engineering : Bina Tambang Vol 5, No 3 (2020): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (479.605 KB) | DOI: 10.24036/bt.v5i3.108638

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Abstract. Soil and rock material has less strength to tension, compared to pressure and shear. Tensile strength has an important role in the stability of mining activities such as drilling, blasting and making slopes and mine tunnels. Determination of the tensile strength value is currently done by testing the indirect tensile strength (Brazillian Test). In the field commonly, to prediction tension strength value used rule of thumb which is the result of analysis from previous tests, but for this case, the prediction results using rule of thumb are inaccurate. The sample used in this research is sedimentary rock taken from several coal mining locations in the Jambi province. This sample is then tested using a compressive machine to get the uniaxial compressive strength and tensile strength values. Descriptive statistical methods and linear regression methods are used in this study to obtain an accurate prediction of tensile strength based on compressive strength data. According to the descriptive statistical method the tensile strength value is 0.41 times the compressive strength value, while if it is linear regression, the result of the tensile strength value is equal to 0.2079 σc + 0.1917. Both of these methods are able to predict the value of the tensile strength better than the existing rule of thumb, but more advanced research with more samples is needed to get the better equation.Keywords: Sedimentary Rock, Brazilian Test, Tensile Strength, Compressive Strength, Prediction
Co-Authors Bambang Heriyadi Rizto Salia Zakri Saldy, Tri Gamela