International Journal of Mining Science and Technology最新文献

{"title":"Quantitative principles of dynamic interaction between rock support and surrounding rock in rockburst roadways","authors":"Lianpeng Dai ,&nbsp;Dingjie Feng ,&nbsp;Yishan Pan ,&nbsp;Aiwen Wang ,&nbsp;Ying Ma ,&nbsp;Yonghui Xiao ,&nbsp;Jianzhuo Zhang","doi":"10.1016/j.ijmst.2024.12.009","DOIUrl":"10.1016/j.ijmst.2024.12.009","url":null,"abstract":"<div><div>Rockbursts, which mainly affect mining roadways, are dynamic disasters arising from the surrounding rock under high stress. Understanding the interaction between supports and the surrounding rock is necessary for effective rockburst control. In this study, the squeezing behavior of the surrounding rock is analyzed in rockburst roadways, and a mechanical model of rockbursts is established considering the dynamic support stress, thus deriving formulas and providing characteristic curves for describing the interaction between the support and surrounding rock. Design principles and parameters of supports for rockburst control are proposed. The results show that only when the geostress magnitude exceeds a critical value can it drive the formation of rockburst conditions. The main factors influencing the convergence response and rockburst occurrence around roadways are geostress, rock brittleness, uniaxial compressive strength, and roadway excavation size. Roadway support devices can play a role in controlling rockburst by suppressing the squeezing evolution of the surrounding rock towards instability points of rockburst. Further, the higher the strength and the longer the impact stroke of support devices with constant resistance, the more easily multiple balance points can be formed with the surrounding rock to control rockburst occurrence. Supports with long impact stroke allow adaptation to varying geostress levels around the roadway, aiding in rockburst control. The results offer a quantitative method for designing support systems for rockburst-prone roadways. The design criterion of supports is determined by the intersection between the convergence curve of the surrounding rock and the squeezing deformation curve of the support devices.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 1","pages":"Pages 41-55"},"PeriodicalIF":11.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143418601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Theoretical and experimental study on high-entropy flotation of micro-fine cassiterite","authors":"Shuming Wen,&nbsp;Yongchao Miao,&nbsp;Yanyu Tang,&nbsp;Zhengyong Song,&nbsp;Qicheng Feng","doi":"10.1016/j.ijmst.2024.12.012","DOIUrl":"10.1016/j.ijmst.2024.12.012","url":null,"abstract":"<div><div>Tin is a critical metal for various industries, making its recovery from low-grade cassiterite ores crucial. This study aimed to optimize the flotation recovery of cassiterite using multi-component collector systems. Several collectors were initially selected through micro-flotation tests, leading to the identification of optimal proportions for a four-component collector system (SHA-OHA-SPA-DBIA in a 4:3:2:1 ratio). Molecular dynamics simulations and surface tension tests were used to investigate the micellar behavior of these collectors in aqueous solution. The adsorption characteristics were quantified using microcalorimetry, enabling the determination of collection entropy and changes in Gibbs free energy. The four-component collector system showed the highest entropy change and the most favorable Gibbs free energy, leading to a cassiterite recovery of above 90% at a concentration of 8.0×10⁻⁵ mol/L. Various analytical techniques were employed to systematically characterize the adsorption mechanism. The findings revealed a positive correlation between the adsorption products formed by the multi-component collectors on the cassiterite surface and the entropy changes. Industrial-scale testing of the high-entropy collector system produced a tin concentrate with an Sn grade of 6.17% and an Sn recovery of 82.43%, demonstrating its substantial potential for practical applications in cassiterite flotation.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 1","pages":"Pages 19-39"},"PeriodicalIF":11.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143418602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Life cycle dynamic formation temperature response and thermal energy extraction of mine geothermal system considering groundwater flow","authors":"Xibing Li ,&nbsp;Zhiying Chen ,&nbsp;Linqi Huang ,&nbsp;Botao Li ,&nbsp;Jingyi Yan ,&nbsp;Peilei Zhang ,&nbsp;Zhixiang Liu","doi":"10.1016/j.ijmst.2024.12.011","DOIUrl":"10.1016/j.ijmst.2024.12.011","url":null,"abstract":"<div><div>As mining activities expand deeper, deep high-temperature formations seriously threaten the future safe exploitation, while deep geothermal energy has great potential for development. Combining the formation cooling and geothermal mining in mines to establish a thermos-hydraulic coupling numerical model for fractured formation. The study investigates the formation heat transfer behaviour, heat recovery performance and thermal economic benefits influenced during the life cycle. The results show that the accumulation of cold energy during the cold storage phase induces a decline in formation temperature. The heat recovery phase is determined by the extent of the initial cold domain, which contracts inward from the edge and decelerates the heat recovery rate gradually. With groundwater velocity increases, the thermal regulation efficiency gradually increases, the production temperature decreases, while the effective radius and thermal power increase first and then decrease. The injected volume and temperature significantly affect, with higher injection temperatures slowing thermal recovery, and the thermal regulation efficiency is more sensitive to changes in formation permeability and thermal conductivity. The heat extraction performance is positively correlated with all factors. The levelized cost of electricity is estimated at 0.1203 $/(kW·h) during the cold storage. During the heat recovery, annual profit is primarily driven by cooling benefits.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 1","pages":"Pages 1-17"},"PeriodicalIF":11.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143418604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deformation energy of tectonic coal under hydrostatic conditions: A new calculation model based on critical state theory","authors":"Chenghao Wang ,&nbsp;Haisong Liu ,&nbsp;Yuanping Cheng ,&nbsp;Liang Wang ,&nbsp;Jingyu Jiang","doi":"10.1016/j.ijmst.2024.12.010","DOIUrl":"10.1016/j.ijmst.2024.12.010","url":null,"abstract":"<div><div>The deformation energy (<em>W</em>_d) of soil-like tectonic coal is crucial for investigating the mechanism of coal and gas outbursts. Tectonic coal has a significant nonlinear constitutive relationship, which makes traditional elastic-based models for computing <em>W</em>_d unsuitable. Inspired by critical state soil mechanics, this study theoretically established a new calculation model of <em>W</em>_d suitable for the coal with nonlinear deformation characteristics. In the new model, the relationship between energy and stress no longer follows the square law (observed in traditional linear elastic models) but exhibits a power function, with the theoretical value of the power exponent ranging between 1 and 2. Hydrostatic cyclic loading and unloading experiments were conducted on four groups of tectonic coal samples and one group of intact coal samples. The results indicated that the relationship between <em>W</em>_d and stress for both intact and tectonic coal follows a power law. The exponents for intact and tectonic coal are close to 2 and 1, respectively. The stress-strain curve of intact coal exhibits small deformation and linear characteristics, whereas the stress-strain curves of tectonic coal show large deformation and nonlinear characteristics. The study specifically investigates the role of coal viscosity in the cyclic loading/unloading process. The downward bending in the unloading curves can be attributed to the time-dependent characteristics of coal, particularly its viscoelastic behavior. Based on experimental statistics, the calculation model of <em>W</em>_d was further simplified. The simplified model involves only one unknown parameter, which is the power exponent between <em>W</em>_d and stress. The measured <em>W</em>_d of the coal samples increases with the number of load cycles. This phenomenon is attributed to coal’s viscoelastic deformation. Within the same stress, the <em>W</em>_d of tectonic coal is an order of magnitude greater than that of intact coal. The calculation model of <em>W</em>_d proposed in this paper provides a new tool for studying the energy principle of coal and gas outbursts.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 1","pages":"Pages 87-100"},"PeriodicalIF":11.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143418603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geostatistics-block-based characterization of the relationship between rock mass quality and powder factor and its application on open-pit limit optimization","authors":"Jinduo Li ,&nbsp;Tianhong Yang ,&nbsp;Feiyue Liu ,&nbsp;Shigui Du ,&nbsp;Wenxue Deng ,&nbsp;Yong Zhao ,&nbsp;Honglei Liu ,&nbsp;Leilei Niu ,&nbsp;Zhiqiang Xu","doi":"10.1016/j.ijmst.2024.12.002","DOIUrl":"10.1016/j.ijmst.2024.12.002","url":null,"abstract":"<div><div>Accurately predicting the powder factor during blasting is essential for sustainable production planning in low-grade mines. This research presents a method for predicting powder factor based on the heterogeneity of rock mass rating (RMR). Considering a low-grade metal mine as an example, this study exploited geostatistical methods to obtain independent RMR for each block unit. A three-dimensional spatial distribution model for the powder factor was developed on the basis of the relationships between the RMR and the powder factor. Subsequently, models for blasting cost and mining value were built and employed to optimize the open-pit limit. The multi-variable model based on the RMR performed well in predicting the powder factor, achieving a correlation coefficient of 0.88 (root mean square error of 4.3) and considerably outperforming the uniaxial compressive strength model. After model optimization, the mean size and standard deviation of the fragments in the blast pile decreased by 8.5% and 35.1%, respectively, whereas the boulder yield and its standard deviation decreased by 33.3% and 58.8%, respectively. Additionally, optimizing the open-pit limit using this method reduced the amount of rock, increased the amount of ore, and lowered blasting costs, thereby enhancing the economic efficiency of the mine. This study provides valuable insights for blasting design and mining decisions, demonstrating the advantages and potential applications of powder factor prediction based on the heterogeneity of rock mass quality.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 1","pages":"Pages 135-147"},"PeriodicalIF":11.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143421096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fatigue properties and constitutive model of Jintan salt rock subjected to complex cyclic loading","authors":"Qingchuan He ,&nbsp;Jianfeng Liu ,&nbsp;Fei Wu ,&nbsp;Cunbao Li ,&nbsp;Jie Chen ,&nbsp;Renbo Gao ,&nbsp;Chunfeng Ye ,&nbsp;Shijie Zhu","doi":"10.1016/j.ijmst.2024.12.007","DOIUrl":"10.1016/j.ijmst.2024.12.007","url":null,"abstract":"<div><div>Salt cavern energy storage technology contributes to energy reserves and renewable energy scale-up. This study focuses on salt cavern gas storage in Jintan to assess the long-term stability of its surrounding rock under frequent operation. The fatigue test results indicate that stress holding significantly reduces fatigue life, with the magnitude of stress level outweighing the duration of holding time in determining peak strain. Employing a machine learning approach, the impact of various factors on fatigue life and peak strain was quantified, revealing that higher stress limits and stress holding adversely impact the fatigue index, whereas lower stress limits and rate exhibit a positive effect. A novel fatigue-creep composite damage constitutive model is constructed, which is able to consider stress magnitude, rate, and stress holding. The model, validated through multi-path tests, accurately captures the elasto-viscous behavior of salt rock during loading, unloading, and stress holding. Sensitivity analysis further reveals the time- and stress-dependent behavior of model parameters, clarifying that strain changes stem not only from stress variations but are also influenced by alterations in elasto-viscous parameters. This study provides a new method for the mechanical assessment of salt cavern gas storage surrounding rocks.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 1","pages":"Pages 121-133"},"PeriodicalIF":11.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143421095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Uncovering the oxidation mechanism of sphalerite (ZnS) in the absence and presence of water: A first-principles investigation","authors":"Yuanjia Luo,&nbsp;Wei Sun,&nbsp;Haisheng Han,&nbsp;Jian Peng,&nbsp;Feng Jiang","doi":"10.1016/j.ijmst.2024.12.004","DOIUrl":"10.1016/j.ijmst.2024.12.004","url":null,"abstract":"<div><div>Herein, a first-principles investigation was innovatively conducted to research the surface oxidation of ZnS-like sphalerite in the absence and presence of H₂O. The findings showed that single O₂ was preferred to be dissociated adsorption on sphalerite surface by generating S<img>O and Zn<img>O bonds, and the S atom on the surface was the most energy-supported site for O₂ adsorption, on which a <img>Zn<img>O<img>S<img>O<img>Zn<img> structure will be formed. However, dissociated adsorption of single H₂O will not happen. It was preferred to be adsorbed on the top Zn atom on sphalerite surface in molecular form through Zn<img>O bond. Besides, sphalerite oxidation can occur as if O₂ was present regardless of the presence of H₂O, and when H₂O and O₂ coexisted, the formation of sulfur oxide (SO₂) needed a lower energy barrier and it was easier to form on sphalerite surface than that only O₂ existed. In the absence of H₂O, when SO₂ was generated, further oxidation of which would form neutral zinc sulfate. In the presence of H₂O, the formation of SO₂ on sphalerite surface was easier and the rate of further oxidation to form sulfate was also greater. Consequently, the occurrence of sphalerite oxidation was accelerated.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 1","pages":"Pages 149-157"},"PeriodicalIF":11.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143421097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study and application of the influence of inclination angle on the cross-fusion mechanism of high gas thick coal seam","authors":"Pengxiang Zhao ,&nbsp;Zechen Chang ,&nbsp;Shugang Li ,&nbsp;Risheng Zhuo ,&nbsp;Yongyong Jia ,&nbsp;Qiudong Shao ,&nbsp;Wen Lei","doi":"10.1016/j.ijmst.2024.12.003","DOIUrl":"10.1016/j.ijmst.2024.12.003","url":null,"abstract":"<div><div>In this study, to better decide the effect of coal seam dip angle upon the dynamic change of the cross-fusion in gas transport and storage areas during the progress of working face in the high gas thick coal seam, a two-dimensional physical simulation experiment regarded as the theoretical research was conducted to properly explore the variation law of overburden fracture. The results demonstrated that the boundary of the gas transport zone was located in the region of fracture separation. The boundary of the gas storage area was located in the abrupt penetration zone. Also, according to the information theory, the state of the gas transport and storage areas was determined by the changing trend of the fracture rate and fracture entropy. The mathematical representation model of the dip effect in gas transport and storage areas was established. The criteria upon which the regional location of the gas transport area and gas storage area can be based were put forward. The cross-fusion evolution process of the dip effect in gas transport and storage areas was revealed as well. The research results could provide guidance for realising directional and accurate gas extraction.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 1","pages":"Pages 69-85"},"PeriodicalIF":11.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143035218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic damage characteristics and control mechanism of rocks anchored by constant resistance and energy absorption material","authors":"Bei Jiang ,&nbsp;Kunbo Wu ,&nbsp;Qi Wang ,&nbsp;Yetai Wang ,&nbsp;Wenrui Wu ,&nbsp;Yaoxia Feng ,&nbsp;Yanbo Zhang","doi":"10.1016/j.ijmst.2024.12.005","DOIUrl":"10.1016/j.ijmst.2024.12.005","url":null,"abstract":"<div><div>With resource exploitation and engineering construction gradually going deeper, the surrounding rock dynamic disaster becomes frequent and violent. The anchorage support is a common control method of surrounding rock in underground engineering. To study the dynamic damage characteristics of anchored rock and the energy absorption control mechanism of dynamic disasters, a new type of constant resistance and energy absorption (CREA) material with high strength, high elongation and high energy absorption characteristics is developed. A contrast test of rockbursts in anchored rock with different support materials is conducted. The test results show that the surface damage rates and energy release degree of anchored rock with common bolt (CB) and CREA are lower than those of unanchored rock, respectively. The total energy, average energy and maximum energy released by CREA anchored rock are 30.9%, 94.3% and 84.4% lower than those of CB anchored rock. Compared with unanchored rock, the rockburst peak stress in the CREA anchored rock is increased by 39.9%, and the rockburst time is delayed by 53.2%. Based on the rockburst energy calculation model, the evolution law of rockburst peak stress and energy release is investigated. The control mechanism of CREA support units on rock dynamic failure is clarified.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 1","pages":"Pages 57-67"},"PeriodicalIF":11.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143418552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Yielding performance of compact yielding anchor cable in working state: Analytical theory and experimental evaluation of yielding resistance enhancement effect","authors":"Zhenyu Wang ,&nbsp;Bo Wang ,&nbsp;Xinxin Guo ,&nbsp;Jinjin Li ,&nbsp;Zhenwang Ma","doi":"10.1016/j.ijmst.2024.12.008","DOIUrl":"10.1016/j.ijmst.2024.12.008","url":null,"abstract":"<div><div>To elucidate the yielding performance of compact yielding anchor cables in working state, a yielding mechanical model incorporating extrusion friction and fastening rotation under confining pressure is constructed. The yielding resistance enhancement effect (<em>ω</em>) caused by working environment constraints is evaluated through multi-layer composite sleeve hole expansion analysis, forming a theoretical framework for calculating the working yielding force. Laboratory and in-situ pull-out tests are conducted to determine the yielding performance and validate the analytical theory. The main conclusions are: (1) Yielding force and energy-release capacity increase with <em>ω</em>, significantly outperforming the unconfined state. (2) In-situ tests under varying rockmass and geostress conditions (F1–F3) determine the yielding force increases to 183.4–290.1, 204.0–290.8, and 235.0–327.1 kN. (3) The slight deviation (–12.5% to 6.2%) between the theoretical and measured yielding force confirms that the analytical theory effectively describes the working yielding performance. (4) <em>ω</em> increases with higher geostress and improved rock mechanical properties, with initial geostress (<em>σ</em>₀) and elastic modulus of surrounding rock (<em>E</em>₃) identified as critical parameters.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 1","pages":"Pages 101-120"},"PeriodicalIF":11.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143418605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}