Yazar "Jamshidi, Amin" seçeneğine göre listele

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    A comparative analysis data mining tools for predicting strength parameters of rocks by point load index
    (University of Tehran, 2025) Jamshidi, Amin; Akbay, Deniz
    The most important criteria needed for the investigation and characterization of a rock mass on site in a geotechnical project are its uniaxial compressive strength (UCS) and tensile strength (TS). The UCS and TS of rocks are determined directly by complex laboratory or field tests that require specialized prepared samples and equipment. Therefore, the UCS and TS of rocks are estimated through several index parameters via regression analysis. The point load index (PLI) due to its simplicity and quickness is a common parameter for estimating the UCS and TS of rocks. In this study, data mining tools are used to estimate the UCS and TS [determined through the Brazilian tensile strength (BTS) test] of rock using PLI. The statistical parameters, including mean absolute error (MAE), root mean squared error (RMSE), and correlation coefficient (r), are used to evaluate the performance of each data mining tool. The validity and accuracy of platforms' data mining tools were verified according to the statistical parameters. The results indicated that all three platforms' data mining tools exhibited remarkable ability to predict UCS and BTS using PLI. Finally, using platforms' data mining tools obviates the need to perform the UCS and BTS tests as time-consuming and laborious efforts. This article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license.
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    A Comparative Investigation on the Brazilian Tensile Strength (BTS) of the Various Rocks and Development a BTS-Based Rock Classification
    (Shahrood Univ Technology, 2025) Jamshidi, Amin; Akbay, Deniz
    Brazilian tensile strength (BTS) is an important parameter in mining activities, particularly in conditions that rocks are under tensile stresses. This test measures the indirect tensile strength of rocks, which is crucial for understanding the mechanical behavior and quality of rocks in the mining context, including slope stability analysis, blast design, rock support systems, excavation and equipment selection, fracture propagation, and hydraulic fracturing and drilling. So far, no classification of tensile strength of rock for mining applications has been presented. In the present study, a new rock classification based on BTS for the various rocks was proposed. To achieve this purpose, by a reviewing previous studies, uniaxial compressive strength (UCS) and BTS of various rock classes, including igneous, sedimentary, and metamorphic were collected. For each rock class, the correlation equations between UCS and BTS were developed using simple regression analysis. Using data analyses, the rocks was categorized into to seven BTS classes. The findings revealed that igneous, sedimentary, and metamorphic rocks have a wide range of BTS values, and subsequent fall into the different BTS classes. The validity of BTS classification was verified using data of BTS and UCS of various rock classes published in the literature, and results showed that BT S can be as a suitable indicator for preliminary assessment of rock quality. This can lead to a better understand from the strength behavior of the rock under tensile stresses in site a mining activity, and therefore, a more accurate design of a mining project.
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    Öğe
    Effect of organic carbon on the physico-mechanical characteristics and durability of the Gohareh limestone subjected to a heating-cooling process
    (Springer Heidelberg, 2025) Shahrokhi, Seyede Samiye; Jamshidi, Amin; Hashemi, Morteza; Akbay, Deniz
    The Gohareh limestone is the most common building stone used in buildings under construction in the Lorestan Province, Iran. Limestone contains organic carbon (OC), which can affect its inherent characteristics and durability against environmental deterioration processes. Any change in the inherent characteristics and durability can lead to a loss of quality of limestone and thus its service life in a building. In the present study, the effects of OC on the physico-mechanical characteristics and durability of the limestone subjected to a heating-cooling (HC) process, a temperature up to 70 degrees C, were investigated. The porosity (n), uniaxial compressive strength (UCS), Brazilian tensile strength (BTS), and P-wave velocity (Vp) of the limestone with different OC contents were determined. These characteristics were also determined after every 10 cycles of HC test for up to 60 cycles. The changes in the appearance and pore space of deteriorated limestone due to the effects of HC were investigated via visual inspection and scanning electron microscopy, respectively. The findings indicate a loss in the physico-mechanical characteristics of the limestone with increasing OC. Moreover, it was found that limestone specimens with higher OC showed greater loss in their physico-mechanical characteristic during HC. These results were consistent with the findings of appearance damage and pore space modification in the limestone specimens after the HC process. The results of the present study can be applied to OC-containing limestones from other regions of the world whose OC and physico-mechanical characteristics are within the range of values obtained for the studied limestone.