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Potential evaluation of acid mine drainage production by coal washing wastes: A case study of Mehmandoost plant, NW Damghan
Ms Najmeh Mohammadi, Dr. Giti Forghani Tehrani, Dr. Afshin Qishlaqi,
Volume 16, Issue 4 (Winter 2022)
Abstract 






Acid mine drainage (AMD) as the most important environmental issue in mining sites is considered a significant source of environmental pollution.  AMD is typically produced by the oxidation of sulphide minerals, especially pyrite. The present study aims to investigate the acid production potential of the wastes of Mehmandoost coal washing plant located in NE Damghan. For this purpose, mineralogical, geochemical, and statistic tests were carried out on 7 representative coal washing waste samples. The obtained results show that although coal washing wastes are not enriched in Cu and Mn, they are moderately enriched in Ni and Co, significantly enriched in Cr, Sb and Zn, strongly enriched in Cd and As, and extremely enriched in Pb and Mo. The main mineral phases presented in the studied samples include quartz, muscovite, clinochlore, kaolinite, illite, montmorillonite, calcite and pyrite. In most of the studied samples, the pH and electrical conductivity (EC) of the saturated paste is <3 and > 2000 μm/cm, respectively. Moreover, in most samples the Net Neutralization Potential (NNP) is < -20. Also, in most of the samples, the Net Acid Production Potential (NAPP) is positive and the Neutralization Potential ratio (NPR) is < 3. The pH of Net Acid Formation (NAG pH) of these samples is < 4.5 and the ratio of Acid Neutralization Capacity to Maximum Acid Potential Acidity (ANC/MPA) is < 1. According to the results of static tests, there is a possibility of production of acidic drainage by the studied samples, therefore, taking suitable management measures to control acid production in the area is of crucial importance.





 


				

				

				



				

				

				Shear Strength Study of Sand Reinforced by Waste Concrete
				

				

					Dr Masoud Amelsakhi, Eng Elham Tehrani, 
Volume 17, Issue 4 (Winter 2023)
				





    Abstract




				

					
This research is a laboratory study to improve the geotechnical properties of sandy soils. Concrete waste with a grain size of 1.2 to 1 inch was used for this purpose. The effect of using concrete waste at 0, 10, 20 and 30 weight percent on dry sandy soil in two loose and dense states was investigated. Based on the results of the direct cutting test, the addition of concrete waste has increased the shear strength and the internal friction angle of the soil; The loose samples made with ٪30 of concrete waste had the greatest effect, so adding ٪30 of concrete waste to loose sand increased the internal friction angle of the soil by ٪32 and the shear strength by ٪42 Similarly, adding ٪10 of concrete waste to dense sand increased the internal angle of friction of the soil by ٪4 and the shear strength by ٪6.


				

				

				



				

				

				3D modeling to determine the geomechanical parameters of the Asmari reservoir and the principal stresses in one of the fields in southwestern Iran
				

				

					 Mohammad Reza Haddad Tehrani,  Mehdi Talkhablou,  Mohammad Reza Asef,  Mehdi Ostad Hasan, 
Volume 19, Issue 6 (Accepted Articles 2025)
				





    Abstract




				

					
For a detailed study of the geomechanical behavior of a hydrocarbon field, the existence of a three-dimensional numerical model that can describe the geomechanical properties and characteristics of the reservoir is necessary. In this study, equations related to geomechanical modeling have been used to estimate some parameters such as effective stresses. This examination, using available data and information, studies and analyzes the elastic behavior of the Asmari reservoir in one of the fields in southwestern Iran and eventually addresses the construction of its three-dimensional geomechanical model. For modeling, the characteristics of effective porosity, absolute permeability, and water saturation were used from the well survey data related to that characteristic in all the wells, which were recalibrated by the core data. In this regard, variogram-based geostatistical methods were used. Also, in this research, the stress state is determined based on the theories and assumptions related to the well. For the three-dimensional modeling of lithostatic pressure or vertical stress, this stress was calculated and modeled in three dimensions by using the data of the density of the overlying rocks of the reservoir (from the ground level to the top of the Asmari formation) and also using the topography data of the ground surface. According to the prepared model, the maximum vertical stress was calculated to be 87 MPa, and the maximum horizontal stress values were up to 127 MPa. Meanwhile, the three-dimensional Gaussian simulation modeling method, as an efficient method, shows over 95% agreement between the real data and the modeled data for rock mechanics parameters such as Young's and shear moduli, and also over 88% agreement for the stress values modeled in three dimensions with the stress values obtained from one-dimensional geomechanical models.


				

				

				







			

			

				

				  
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