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Recycled materials in railroad substructure: an energy perspective

Railway engineering Science 2022年第3期30卷 304-322页

作者： Buddhima Indraratna Yujie Qi Rakesh Sai Malisetty Sinniah KNavaratnarajah Fatima Mehmood Miriam Tawk Transport Research Centre School of Civil and Environmental EngineeringFaculty of Engineering and Information TechnologyUniversity of Technology SydneySydneyNSW 2007Australia Department of civil engineering Faculty of EngineeringUniversity of PeradeniyaPeradeniyaSri Lanka school of civil Mining and Environmental EngineeringUniversity of WollongongWollongongNSW 2522Australia College of engineering and Technology American University of the Middle EastEgailaKuwait

Given that the current ballasted tracks in Australia may not be able to support faster and significantly heavier freight trains as planned for the future,the imminent need for innovative and sustainable ballasted tracks for transport infrastructure is *** the past two decades,a number of studies have been conducted by the researchers of Transport Research Centre(TRC)at the university of Technology Sydney(UTS)to investigate the ability of recycled rubber mats,as well as waste tyre cells and granulated rubber to improve the stability of track substructure including ballast and subballast *** paper reviews four applications of these novel methods,including using recycled rubber products such as CWRC mixtures(i.e.,mixtures of coal wash(CW)and rubber crumbs(RC))and SEAL mixtures(i.e.,mixtures of steel furnace slag,CW and RC)to replace subballast/capping materials,tyre cells reinforcements for subballast/capping layer and under ballast mats;and investigates the energy dissipation capacity for each application based on smallscale cyclic triaxial tests and large-scale track model *** has been found that the inclusion of these rubber products increases the energy dissipation effect of the track,hence reducing the ballast degradation efficiently and increasing the track ***,a rheological model is also proposed to investigate the effect of different rubber inclusions on their efficiency to reduce the transient motion of rail track under dynamic *** outcomes elucidated in this paper will lead to a better understanding of the performance of ballast tracks upgraded with resilient rubber products,while promoting environmentally sustainable and more affordable ballasted tracks for greater passenger comfort and increased safety.

关键词： Ballast degradation Recycled rubber Energy dissipation Laboratory testing Rheological model

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civil-GIS incorporated approach for water resource management in a developed catchment for urban-geomorphic sustainability:Tallowa Dam,southeastern Australia

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International Soil and Water Conservation Research 2016年第4期4卷 304-313页

作者： Ali K.M.Al-Nasrawi Brian G.Jones Yasir M.Alyazichi Sarah M.Hamylton Mohammed T.Jameel Ali Faraj Hammadi school of Earth and environmental Sciences University of WollongongNSW 2522Australia school of civil Mining&Environmental EngineeringUniversity of WollongongNSW 2522Australia school of Mechanical Materials and Mechatronics EngineeringUniversity of WollongongNSW 2522Australia

Damming rivers causes two main problems affecting a river's geomorphic ecosystem and its water *** Tallowa Dam on the Shoalhaven River in southeastern NSW,Australia,provides a case study to find the best sustainable solutions to avoid these *** project uses a civil-infrastructure idea to design a grid of collector pipes from the reservoir bottom *** data analysis using ArcGIS 10.2 is used to determine the best grid location for the pipes in the *** and sediment samples have been analysed for grain size,heavy metal and organic matter *** dam has led to a significant decline in sediment transport and water discharge to the lower reaches of the river which has resulted in greater erosion of sediment and higher salinity rates within the lower river and coastal *** quality in the reservoir has been affected by increased sediment accumulation,particularly mud,which has increased the amount of heavy metal and nutrient pollution that could eventually affect the water users.A proposed solution is to use over-storage water to remove accumulated sediment from the base of the dam through a net of collector pipes controlled by automechanical gates,instead of flowing over the top of the *** would maximize the volume of upstream sediment and contained pollutants that can be released from the reservoir into the downstream river ecosystems as well as providing better water quality and a longer water storage time.

关键词： Water quality Geomorphology Pollutants civil-infrastructure GIS-detection

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A multi-step approach for block-cave production scheduling optimization

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International Journal of mining Science and Technology 2013年第5期23卷 739-750页

作者： Yashar Pourrahimian Hooman Askari-Nasab Dwayne D.Tannant Department of civil and environmental engineering School of Mining and Petroleum EngineeringUniversity of Alberta school of engineering University of British Columbia

Production schedules that provide optimal operating strategies while meeting practical,technical,and environmental constraints are an inseparable part of mining *** only on manual planning methods or computer software based on heuristic algorithms will lead to mine schedules that are not the optimal global *** mine planning models have been proved to be very effective in supporting decisions on sequencing the extraction of material in *** objective of this paper is to develop a practical optimization framework for caving operations’production *** overcome the size problem of mathematical programming models and to generate a robust practical near-optimal schedule,a multi-step method for long-term production scheduling of block caving is presented.A mixed-integer linear programming(MILP)formulation is used for each *** formulations are developed,implemented,and verifed in the TOMLAB/CPLEX *** production scheduler aims to maximize the net present value of the mining operation while the mine planner has control over defned *** and comparison of the models for production scheduling using 298 drawpoints over 15 periods are presented.

关键词： Block caving Aggregation Production scheduling MILP CPLEX

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CO2 sequestration characteristics in the cementitious material based on gangue backfilling mining method

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International Journal of mining Science and Technology 2019年第5期29卷 721-729页

作者： Peng Wang Xianbiao Mao Shen-En Chen school of Mechanics and civil engineering China University of Mining&TechnologyXuzhou 221116China school of civil and environmental engineering University of North Carolina at CharlotteCharlotteNC 28262USA

The increasing anthropogenic CO2 emission and global warming has challenged the China and other countries to seek new and better ways to meet the world’s increasing need for energy while reducing greenhouse gas *** overall proposition of this research is to develop a brand-new CO2 physical and chemical sequestration method by using solid waste of coal mining and cementitious material which are widely used for goaf backfilling in coal *** research developed a new testing system(constant temperature pressurized reaction chamber(CTPRC))to study the effects of different initial parameters on mineral carbonation such as different initial water-binder ratio,initial sample porosity and initial carbon dioxide *** experimental results show that the CO2 consumption ratio is 15%,10%and 7%higher with relatively high initial water-binder ratio,initial sample porosity and initial CO2 pressure within 48 *** addition,some physical and chemical evidence was found through the electron microscope scanning and XRD test to further explain the above test *** proposed research will provide critical parameters for optimizing CO2 sequestration capacity in this cementitious backfilling material with forming agent.

关键词： Gangue backfilling Goaf Carbon dioxide sequestration Mineral carbonation Cementious material

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Biodesulfurization of vanadium-bearing titanomagnetite concentrates and pH control of bioleaching solution

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International Journal of Minerals,Metallurgy and Materials 2013年第10期20卷 925-930页

作者： Xiao-rong Liu Sheng-cai Jiang Yan-jun Liu Hui Li Hua-jun Wang school of Materials Science and engineering Shanghai Institute of Technology China Metallurgical mining Corporation civil and environmental engineering school University of Science and Technology Beijing

Vanadium-bearing titanomagnetite concentrates were desulfurized with Acidithiobacillus ferrooxidans （A. ferrooxidans）. The sulfur content of the concentrates was reduced from 0.69wt% to 0.14wt% after bioleaching for 15 d with a 10% pulp density at 30℃. Maintaining a stable pH value during biodesulfurization was critical because of high acid consumption, resulting from a combination of nonoxidative and oxidative dissolution of pyrrhotite in acid solution. It is discovered that the citric acid-disodium hydrogen phosphate buffer of pH 2.0 can control the solution pH value smoothly in the optimal range of 2.0-3.0 for A. ferrooxidans growth. Using the buffer in the volume fraction range of 5.0%-15.0% stimulates A. ferooxidans growth and improves the biodesulfurization efficiency. Compared with the buffer-free control case, the maximum increase of biodesulfurization rate is 29.7% using a 10.0vol% buffer. Bioleaching provides an alternative process for desulfurization of vanadium-bearing titanomagnetite ores.

关键词： titanomagnetite vanadium biodesulfurization Acidithiobacillus ferrooxidans citric acid disodium hydrogenphosphate

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Optimization and mechanism of gold-bearing sulfide flotation

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Rare Metals 2014年第3期33卷 363-368页

作者： Zhong-Mei Sun Chun-Bao Sun Ji-Zhen Wang Wan-Zhong Yin school of civil and environmental engineering University of Science and Technology Beijing Zijin Research Institute of mining and Metallurgy school of Materials & Metallurgy Northeastern University College of Zi Jin mining Fuzhou University

In order to overcome the difficulty of extracting gold from gold-bearing sulfide ore by cyanide process flotation was adopted based on mineralogical analysis Mineralogy shows that gold particles are of superfine structure and mainly enclosed by sulfide ores. Primary gold-bearing sulfide ore is fine-grained pyrite and arsenopyrite. The paper describes the effects of ratios and dosage of activators and collectors on the recovery and grade of gold concentrate. A proper flotation flowsheet was then proposed based on experimental condition and closedcircuit test. The gold concentrate with the gold grade of25.14 g ton-1and the recovery of 86.94 % is obtained after one rougher, three cleaners, and four scavengers from fine grinding flotation process. Furthermore, the mechanisms of combined activators and combined collectors were studied by thermodynamic calculation, and structure-activity relationship of flotation reagent was also explained

关键词： Gold Pyrite Arsenopyrite Activator Combined reagent Flotation

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Fracture features of brittle coal under uniaxial and cyclic compression loads

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International Journal of Coal Science & Technology 2023年第1期10卷 60-72页

作者： Shikang Song Ting Ren Linming Dou Jian Sun Xiaohan Yang Lihai Tan Shaanxi Zhengtong Coal Industry Co. Ltd.Xianyang 713600China school of civil Mining and Environmental EngineeringUniversity of WollongongWollongong 2522Australia State Key Laboratory of Coal Resources and Safemining China University of Mining and TechnologyXuzhou 221116China school of Energy and Safety engineering Anhui Universityof Science and TechnologyHuainan 232001China school of civil engineering The University of QueenslandBrisbane 4072Australia

Under the efects of complex geological and stress environments,burst hazards continue to be a major challenge for underground space utilization and deep resources exploration as its occurrence can lead to personnel causalities,equipment damage and structural *** the stress path experienced by in-situ coal body,cyclic loading appears in quite various forms for instance shearer cutting,overlying strata breakage,hydro-fracturing and blasting,during tunnel,mining and underground space utilizing *** stability of the underground coal body subject to periodic loading/unloading stress is extremely important for maintain the function of designed engineering structure for waste storage,safe mining,roadway development,gas recovery,carbon sequestration and so *** mechanical properties of hard rock subject to cyclic fatigue loads has been intensively investigated by many researchers as the rock burst induced by supercritical loads has long been a safety risk and engineering problems for civil and tunneling engineering under deep *** recently,the mechanical properties of coal samples under cyclic fatigue loads is investigated from the aspect of hysteresis,energy dissipation and irreversible damage as the burst hazards of brittle coal is rising in many ***,the crack propagation and fracture pattern of brittle coal need more research to understand the micro mechanism of burst incubation subject to cyclic fatigue loads as brittle coal can store more elastic strain energy and rapidly release the energy when its ultimate strength once *** research studied the internal crack status corresponding to diferent cyclic fatigue loading stage of brittle coal *** AE monitoring was applied during the uniaxial and cyclic loading process of brittle coal samples to record the crack intensity of samples at diferent loading *** damage evolution curve corresponding to loading status was then *** fracture pattern

关键词： Fracture Crack Coal burst Acoustic emission Computed tomography

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Mechanics and safety issues in tailing-based backfill:A review

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International Journal of Minerals,Metallurgy and Materials 2020年第9期27卷 1165-1178页

作者： Xu Zhao Andy Fourie Chong-chong Qi school of civil Environmental and Mining EngineeringUniversity of Western AustraliaPerth 6009Australia school of Resources and Safety engineering Central South UniversityChangsha 410083China

Voids(referred to as "stopes") are generally created during underground mining activities and can lead to both local and regional geotechnical instabilities. To assist in managing the stability of mining-related voids and improving the recovery of orebodies, tailing-based backfill technology has been widely used around the world. In the design of tailing-based backfill strategy, the specific function and engineering requirements of the filling are intimately dependent on the stress distribution within the backfilled stope. In this paper, the main mechanics involved in tailing-based backfill in underground mines, which include arching, consolidation, hydration process, and movement of surrounding rocks, are reviewed. Research on the safety of a barricade and stability of an exposed fill face are also presented. In conclusion, the backfilling process should be performed on the basis of a better understanding of the complicated interactions of the mechanisms of filling, consolidation, and hydration process(when cement is added).

关键词： tailing-based backfill arching consolidation barricade safety

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Method for visualizing the shear process of rock joints using 3D laser scanning and 3D printing techniques

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Journal of Rock Mechanics and Geotechnical engineering 2023年第1期15卷 204-215页

作者： Man Huang Chenjie Hong Peng Sha Shigui Du Zhanyou Luo Zhigang Tao school of civil engineering Shaoxing UniversityShaoxing312000China school of Mechanics and civil engineering China University of Mining and TechnologyBeijing100083China school of civil and environmental engineering Ningbo UniversityNingbo315000China

This study presents a visualized approach for tracking joint surface ***-dimensional laser scanning(3DLS)and 3D printing(3DP)techniques are adopted to record progressive failure during rock joint *** 3DP resin is used to create transparent specimens to reproduce the surface morphology of a natural joint *** freezing method is employed to enhance the mechanical properties of the 3DP specimens to reproduce the properties of hard rock more accurately.A video camera containing a charge-coupled device(CCD)camera is utilized to record the evolution of damaged area of joint surface during the direct shear *** optimal shooting distance and shooting angle are recommended to be 800 mm and 40?,*** images captured by the CCD camera are corrected to quantitatively describe the damaged area on the joint *** indicates that this method can accurately describe the total sheared areas at different shear *** findings may contribute to elucidating the shear behavior of rock joints.

关键词： Rock joint Shear test Three-dimensional printing(3DP) Three-dimensional laser scanning(3DLS) Visualization approach

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Breakage and shape analysis of ballast aggregates with different size distributions

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Particuology 2017年第6期15卷 84-92页

作者： Yifei Sun Changjie Zheng Key Laboratory ofMinistryof Education for Geomechanics and Embankment engineering College of Civil and Transportation Engineering Hohai University Nanjing 210098 China school of civil Mining and Environmental Engineering University ofWollongong Wollongong NSW2522 Australia Key Laboratory of New Technology for Consgruction of Cities in Mountain Area Ministry of Education School of Civil Engineering Chongqing University Chongqing 400045 China

Particle breakage usually alters the size and shape of ballast aggregates, which significantly influences the long-term performance of rail tracks. This study reports an investigation on the breakage and shape characteristics of ballast aggregates subjected to monotonic and cyclic triaxial tests with two different load frequencies. The results show that particle breakage is not only influenced by the particle size distribution but also by the relative density. Breakage indices defined by breakage potential and grading entropy fail to characterize the breakage extent of ballast with multiple initial particle size distributions, while the Marsal breakage index exhibits a general decrease with increasing coefficient of uniformity for ballast with similar relative densities. Higher breakage extent is observed in ballast subjected to a higher load frequency. Particle shape varies with load frequency because of breakage. A slightly higher value of each shape index is observed for ballast subjected to a higher load frequency, implying that ballast aggregates become increasingly regular with the increase of load frequency,

关键词： Breakage Breakage potentia Grading entropy Particle shape Ballast

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