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Progress and prospects of mining with backfill in metal mines in China

International Journal of Minerals,Metallurgy and Materials 2023年第8期30卷 1455-1473页

作者： Gaili Xue Erol yilmaz Yongding Wang College of Mining Technology Taiyuan University of TechnologyTaiyuan030024China Research Center of Green Mining Engineering Technology in Shanxi Province Taiyuan030024China Department of Civil Engineering Geotechnical DivisionRecep Tayyip Erdogan UniversityFenerRizeTR53100Turkey Longshou Mine Jinchuan Group Co.Ltd.Jinchuan737100China

Mining is the foundation of modern industrial *** the context of the“carbon peaking and carbon neutrality”era,countries have put forward the development strategy of“adhering to the harmonious coexistence of humans and nature.”The ongoing progress and improvement of filling mining technology have provided significant advantages,such as“green mining,safe,efficient,and low-carbon emission,”which is crucial to the comprehensive utilization of mining solid waste,environmental protection,and safety of *** review paper describes the development history of metal mine filling mining in China and the characteristics of each *** excitation mechanism and current research status of producing cementitious materials from blast furnace slag and other industrial wastes are then presented,and the concept of developing cementitious materials for backfill based on the whole solid waste is *** advances in the mechanical characteristics of cemented backfill are elaborated on four typical levels:static mechanics,dynamic mechanics,mechanical influencing factors,and multi-scale *** working/rheological characteristics of the filling slurry are presented,given the importance of the filling materials conveying ***,the future perspectives of mining with backfill are discussed based on the features of modern filling concepts to provide the necessary theoretical research value for filling mining.

关键词： mining with backfill cementitious materials mechanical characteristics slurry properties future perspectives

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Microstructural evolution and strengthening mechanism of aligned steel fiber cement-based tail backfills exposed to electromagnetic induction

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International Journal of Minerals,Metallurgy and Materials 2024年第11期31卷 2390-2403页

作者： Xihao Li Shuai Cao Erol yilmaz School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education University of Science and Technology BeijingBeijing 100083China Department of Civil Engineering Geotechnical DivisionRecep Tayyip Erdogan UniversityFener Rize TR53100Turkey

Cemented tailings backfill(CTB)not only boosts mining safety and cuts surface environmental pollution but also recovers ores previously retained as pillars,thereby improving resource *** use of alternative reinforcing products,such as steel fiber(SF),has continuously strengthened CTB into *** approach prevents strength decreases over time and reinforces its long-term durability,especially when mining ore in adjacent underground *** this study,various microstructure and strength tests were performed on SFCTB,considering steel fiber ratio and electromagnetic induction strength *** findings show that combining steel fibers and their distribution dominantly influences the improvement of the fill’s ***’s strength rises by fiber insertion and has an evident correlation with fiber insertion and magnetic induction *** magnetic induction strength is 3×10^(-4) T,peak uniaxial compressive stress reaches 5.73 MPa for a fiber ratio of 2.0vol%.The cracks’expansion mainly started from the specimen’s upper part,which steadily expanded downward by increasing the load until damage *** doping of steel fiber and its directional distribution delayed crack *** the doping of steel fiber was 2.0vol%,SFCTBs showed excellent ductility *** energy required for fills to reach destruction increases when steel-fiber insertion and magnetic induction strength *** study provides notional references for steel fibers as underground filling additives to enhance the fill’s durability in the course of mining operations.

关键词： electromagnetic induction steel fiber cemented tailings backfill strength microstructure

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Effect of layer thickness on the flexural property and microstructure of 3D-printed rhomboid polymer-reinforced cemented tailing composites

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International Journal of Minerals,Metallurgy and Materials 2023年第2期30卷 236-249页

作者： Ziyue Zhao Shuai Cao Erol yilmaz State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education University of Science and Technology BeijingBeijing 100083China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China Department of Civil Engineering Geotechnical DivisionRecep Tayyip Erdoğan UniversityFenerRize TR53100Turkey

For mines with poor ore bodies and surrounding rocks,the general mining method does not allow the ore to be extracted from underground safely and *** these mines,the downward layered filling mining technique is undoubtedly the most suitable mining *** downward filling mining technique may eliminate the troubles relating to poor ore deposit conditions,such as production safety,ore loss rate,and depletion ***,in this technique,the safety of the artificial roof of the next stratum is of paramount *** tailings backfilling(CTB)that is not sufficiently cemented and causes collapses could threaten ore *** paper explores a diamond-shaped composite structure to mimic the stability of a glued false roof in an actual infill mine based on the recently emerged three-dimensional(3D)printing *** means such as three-point bending and digital image correlation(DIC)techniques were used to explore the flexural characteristics of 3D construction specimens and CTB combinations with different cement/tailings weight ratios at diverse layer *** results show that the 3D structure with a 14-mm ply height and CTB has strong flexural characteristics,with a maximum deflection value of 30.1 mm,while the 3D-printed rhomboid polymer(3D-PRP)structure with a 26-mm ply height is slightly worse in terms of flexural strength characteristics,but it has a higher maximum flexural strength of 2.83 MPa.A combination of 3D structure and CTB has more unique mechanical properties than CTB *** research work offers practical knowledge on the artificial roof performance of the downward layered filling mining technique and builds a scientific knowledge base regarding the successful application of CTB material in mines.

关键词： tailings cemented fills 3D printed rhomboidal polymer three-point bending test digital image correlation

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Reinforcing effects of polypropylene on energy absorption and fracturing of cement-based tailings backfill under impact loading

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International Journal of Minerals,Metallurgy and Materials 2024年第4期31卷 650-664页

作者： Jiajian Li Shuai Cao Erol yilmaz School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education University of Science and Technology BeijingBeijing 100083China Department of Civil Engineering Geotechnical DivisionRecep Tayyip Erdogan UniversityFenerRize TR53100Turkey

Polypropylene(PP)fiber-reinforced cement-based tailings backfill(FRCTB)is a green compound material with superior crack resistance and has good prospects for application in underground ***,FRCTB exhibits susceptibility to dynamic events,such as impact ground pressure and blast *** paper investigates the energy and crack distribution behavior of FRCTB under dynamic impact,considering the height/diameter(H/D)*** Hopkinson pressure bar,industrial computed tomography scan,and scanning electron microscopy(SEM)experiments were carried out on six types of *** outcomes confirmed fiber aggregation at the bottom of *** H/D was less than 0.8,the proportion of PP fibers distributed along theθangle direction of80°-90°*** the total energy,all samples presented similar energy absorption,reflectance,and ***,a rise in H/D may cause a rise in the energy absorption rate of FRCTB during the peak phase.A positive correlation existed between the average strain rate and absorbed energy per unit *** increase in H/D resulted in a decreased crack volume fraction of *** the H/D was greater than or equal to 0.7,the maximum crack volume fraction of FRCTB was observed close to the incidence *** cracks were present only in the FRCTB with an H/D ratio of *** with H/D ratios of 0.5 and 0.6 showed similar distributions of weakly and heavily damaged *** fibers can limit the emergence and expansion of cracks by influencing their *** observations revealed considerable differences in the bonding strengths between fibers and the *** that adhered particularly well to the substrate were attracted together with the hydration products adhering to *** results show that FRCTB is promising as a sustainable and green backfill for determining the design properties of mining with backfill.

关键词： cement-based tailings fiber-reinforced backfills fracture energy absorption impact loading

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Space-Time Geometry of Quark and Strange Quark Matter

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Chinese Journal of Astronomy and Astrophysics 2007年第6期7卷 757-763页

作者： hsan yilmaz Can Akta■ anakkale Onsekiz Mart University Arts and Sciences FacultyDepartment of PhysicsTerzio■lu Campus17020 anakkaleTurkey anakkale Onsekiz Mart UniversityAstrophysics Research Center17020 anakkaleTurkey anakkale Onsekiz Mart University Arts and Sciences FacultyDepartment of MathematicsTerzio■lu Campus17020 anakkaleTurkey

We study quark and strange quark matter in the context of general relativity. For this purpose, we solve Einstein＇s field equations for quark and strange quark matter in spherical symmetric space-times. We analyze strange quark matter for the different equations of state （EOS） in the spherical symmetric space-times, thus we are able to obtain the space-time geometries of quark and strange quark matter. Also, we discuss the features of the obtained solutions. The obtained solutions are consistent with the results of Brookhaven Laboratory, i.e. the quark-gluon plasma has a vanishing shear （i.e. quark-gluon plasma is perfect）.

关键词： cosmology -- theory early universe

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Principal Congruence Subgroups of Hecke Groups H(q^(1/2))

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Acta Mathematica Sinica,English Series 2006年第2期22卷 383-392页

作者： Nihal yilmaz ZGüR Department of Mathematics Balikesir University

Using the notion of quadratic reciprocity, we discuss the principal congruence subgroups of the Hecke groups H（√q）,q 〉 5 prime number.

关键词： Hecke group Principal congruence subgroup Congruence subgroup

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Effect of acupuncture therapy on fracture healing in rats with femur fractures

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Journal of Traditional Chinese Medicine 2020年第2期40卷 275-283页

作者： Seval yilmaz Emre Kaya Erhan yilmaz Ahmet Kavakli Suleyman Gurbuz Mustafa Ozkaraca Firat University Faculty of Veterinary MedicineDepartment of BiochemistryElazig 23119Turkey Firat University Faculty of MedicineDepartment of Orthopedics and TraumatologyElazig 23119Turkey Firat University Faculty of MedicineDepartment of AnatomyElazig 23119Turkey Ataturk University Faculty of Veterinary MedicineDepartment of PathologyErzurum 25240Turkey

OBJECTIVE: To investigate the effect of acupuncture therapy on fracture healing in rats with femur ***: A total of 10 groups were formed;control group, groups sacrificed on 7 th, 14 th, and 21 st days of fracture formation, groups to which acupuncture was applied for 7, 14, and 21 d, groups to which fracture and acupuncture were applied for 7,14, and 21 d. A transverse fracture line was formed in femurs of rats by using a Gigli saw. The Kirschner wire was driven retrograde down from the fracture line to proximal part of the bone and then, the fracture was fixed towards distal part. Acupuncture was applied to the rats for 7, 14, and 21 d as 4 sessions per week after formation of the ***: Malondialdehyde(MDA), reduced glutathione(GSH) levels, catalase(CAT), glutathione-Stransferase(GST), superoxide dismutase(SOD), and glucose-6-phosphate dehydrogenase(G6 PD) activities were measured. Despite the increased MDA levels, G6 PD and SOD activities reduced during the fracture healing. There was a statistically significant increase in MDA, GSH levels, and G6 PD activity in fracture groups compared to control group, but CAT, GST, and SOD activities decreased. The use of acupuncture enhanced callus development and bone mineralization during bone ***: The acupuncture therapy can affect suppression of the effects of free oxygen radicals and regulation of the antioxidant enzyme activity in fracture healing. Thus, it is suggested that acupuncture treatment would be beneficial for fracture healing in order to eliminate the negative effects induced by oxygen free radicals.

关键词： Femur Fracture healing Acupuncture Malondialdehyde Antioxidants

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Metabolic-associated Fatty Liver Disease(MAFLD):A Multi-systemic Disease Beyond the Liver

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Journal of Clinical and Translational Hepatology 2022年第2期10卷 329-338页

作者： Eda Kaya Yusuf yilmaz Department of Internal Medicine Ruhr University BochumUniversity Hospital Knappschaftskrankenhaus BochumBochumGermany Department of Gastroenterology School of MedicineMarmara UniversityIstanbulTurkey Liver Research Unit Institute of GastroenterologyMarmara UniversityIstanbulTurkey

Nonalcoholic fatty liver disease(NAFLD)is a multisystemic clinical condition that presents with a wide spectrum of extrahepatic manifestations,such as obesity,type 2 diabetes mellitus,metabolic syndrome,cardiovascular diseases,chronic kidney disease,extrahepatic malignancies,cogni-tive disorders,and polycystic ovarian *** NAFLD patients,the most common mortality etiology is cardiovascular disorders,followed by extrahepatic malignancies,diabetes mellitus,and liver-related ***,the severity of extrahepatic diseases is parallel to the severity of *** clinical practice,awareness of the associations of concomitant diseases is of major importance for initiating prompt and timely screening and multidisciplinary management of the disease *** 2020,a consensus from 22 countries redefined the disease as metabolic(dysfunction)-associated fatty liver disease(MAFLD),which resulted in the redefinition of the corre-sponding *** the patients diagnosed with MAFLD and NAFLD mostly overlap,the MAFLD and NAFLD populations are not *** this review,we compared the associations of key extrahepatic diseases between NAFLD and MAFLD.

关键词： Metabolic diseases Fatty liver Liver fibrosis Diabetes mellitus,type 2 Cardiometabolic risk factors

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Structural and superconducting properties in Y_(0.6)Gd_(0.4)Ba_2(Nb)Cu_3O_(7-y) cuprates doped with niobium

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Journal of Rare Earths 2012年第3期30卷 241-244页

作者： M. yilmaz O. Dogan A. K. Education Faculty Department of Physics Konya University

Polycrystalline YBa2Cu3O7-y （YBCO） and Y0.6Gd0.4Ba2-xNbxCu3O7-y （YGBNCO） compounds with 0≤x≤0.225 were synthesized using standard solid state reaction technique. The structure for all samples was characterized by X-ray difference （XRD） and scanning electron microscopy （SEM）. The transport properties were measured by the （FPP） method in the temperature range from 70 to 130 K. As the Nb content in the samples increased, a diffused phase indicating a niobium perovskite phase and a small amount of unidentified phase appeared. With the increase of Nb content, the superconducting transition temperature Tconset increased slowly with x≤0.125, and then it remained unchanged or slowly decreased with 0.125≤x≤0.225. It could be found that there was a slow decrease of zero-resistance temperature, Tcoffset, with the increase of Nb content. The larger transition width might result from the YBa2NbO6 phase, impurity and unidentified phases of the sample due to the Nb doping.

关键词： Y0.6Gd0.4Ba2Cu3O7-y cuprates Gd and Nb co-doping structural and superconducting properties rare earths

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Construction of a Quadratic Model for Predicted and Measured Global Solar Radiation in Chile

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Chinese Physics Letters 2007年第1期24卷 291-293页

作者： Ercan yilmaz Beatriz CANCINO Edmundo LOPEZ Department of Physics Mustafa Kemal University 31040 Antakya Turkey Department of Food Engineering Pontificia Universidad Catdlica de Valparaiso Chile Department of Electrical Engineering Pontificia Universidad Cat61ica de Valparaiso Chile

Global solar radiation data for sites in Chile are analysed and presented in a form suitable for their use in engineering. A new model for monthly average data is developed to predict monthly average global radiation with acceptable accuracy by using actinographic data due to scarcing of pyranometer data. Use of the new quadratic model is proposed because of its relatively wider spectrum of values for Angstrom coefficients ao, al, and a2.

关键词： SOLAR radiation ENGINEERING RADIATION ELECTROMAGNETIC waves

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