International Journal of Mining Science and Technology最新文献

{"title":"Fatigue behaviour characteristics and life prediction of rock under low-cycle loading","authors":"Zehan Liu, Jin Yu, Chonghong Ren, Khalid Elbaz, Defu Zhu, Yanyan Cai","doi":"10.1016/j.ijmst.2025.03.007","DOIUrl":"https://doi.org/10.1016/j.ijmst.2025.03.007","url":null,"abstract":"The fatigue characteristics of rock materials significantly impact the economy and safety of underground structures during construction. Hence, it is essential to conduct further investigation into the progressive damage processes of rocks under cyclic loading conditions. This research utilised both laboratory experiments and discrete element simulations to investigate how confining pressure and fatigue upper limit stress influence the mechanical behaviour and crack development of marble under low-cycle fatigue conditions. By introducing synthetic displacement and reasonable assumptions, the classical damage evolution law was updated, resulting in a fatigue life prediction formula applicable to various rock materials and loading conditions. The results indicate that lower fatigue upper limit stress can delay the accumulation of damage and extend the fatigue life of the rock, but it results in more severe ultimate failure. The damage variable’s correlation with the relative number of loading cycles for different fatigue load upper limits under the same confining pressure can be approximated by the same functional relationship. The modified damage evolution model provides an effective characterisation of this trend. The proposed fatigue life prediction method comprehensively accounts for different rock materials, confining pressures, loading frequencies, and initial damage, showing a close match with actual results.","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"125 1","pages":""},"PeriodicalIF":11.8,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143853607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An improved fluid flow algorithm for hydraulic fracturing: Optimizing domain volume and crack pressure update strategies","authors":"Wei Zhang,&nbsp;Jing Bi,&nbsp;Yu Zhao,&nbsp;Yongfa Zhang,&nbsp;Chaolin Wang,&nbsp;Yang Pan","doi":"10.1016/j.ijmst.2025.03.001","DOIUrl":"10.1016/j.ijmst.2025.03.001","url":null,"abstract":"<div><div>With the widespread adoption of hydraulic fracturing technology in oil and gas resource development, improving the accuracy and efficiency of fracturing simulations has become a critical research focus. This paper proposes an improved fluid flow algorithm, aiming to enhance the computational efficiency of hydraulic fracturing simulations while ensuring computational accuracy. The algorithm optimizes the aperture law and iteration criteria, focusing on improving the domain volume and crack pressure update strategy, thereby enabling precise capture of dynamic borehole pressure variations during injection tests. The effectiveness of the algorithm is verified through three flow-solid coupling cases. The study also analyzes the effects of borehole size, domain volume, and crack pressure update strategy on fracturing behavior. Furthermore, the performance of the improved algorithm in terms of crack propagation rate, micro-crack formation, and fluid pressure distribution was further evaluated. The results indicate that while large-size boreholes delay crack initiation, the cracks propagate more rapidly once formed. Additionally, the optimized domain volume calculation and crack pressure update strategy significantly shorten the pressure propagation stage, promote crack propagation, and improve computational efficiency.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 4","pages":"Pages 639-657"},"PeriodicalIF":11.7,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on rock crack contact model considering linked substances based on particle flow method","authors":"Fukun Xiao ,&nbsp;Kai Xie ,&nbsp;Lei Shan ,&nbsp;Gang Liu ,&nbsp;Lianchong Li ,&nbsp;Fedotova Iuliia","doi":"10.1016/j.ijmst.2025.02.007","DOIUrl":"10.1016/j.ijmst.2025.02.007","url":null,"abstract":"<div><div>The models constructed by particle flow simulation method can effectively simulate the heterogeneous substance characteristics and failure behaviors of rocks. However, existing contact models overlook the rock cracks, and the various simulation methods that do consider cracks still exhibit certain limitations. In this paper, based on Flat-Joint model and Linear Parallel Bond model, a crack contact model considering linked substance in the crack is proposed by splitting the crack contact into two portions: linked portion and unlinked portion for calculation. The new contact model considers the influence of crack closure on the contact force-displacement law. And a better compressive tensile strength ratio (UCS/T) was obtained by limiting the failure of the contact bond to be solely controlled by the contact force and moment of the linked portion. Then, by employing the FISH Model tool within the Particle Flow Code, the contact model was constructed and verified through contact force–displacement experiments and loading-unloading tests with cracked model. Finally, the contact model was tested through simulations of rock mechanics experiments. The results indicate that the contact model can effectively simulate the axial and lateral strain laws of rocks simultaneously and has a relatively good reproduction of the bi-modularity of rocks.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 4","pages":"Pages 553-571"},"PeriodicalIF":11.7,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydraulic fracture propagation in soft coal composite reservoirs: Mechanical responses and energy dissipation mechanisms","authors":"Aitao Zhou ,&nbsp;Yizheng He ,&nbsp;Kai Wang ,&nbsp;Bo Li ,&nbsp;Yida Wang ,&nbsp;Yuexin Yang","doi":"10.1016/j.ijmst.2025.02.008","DOIUrl":"10.1016/j.ijmst.2025.02.008","url":null,"abstract":"<div><div>The hydraulic fractures induced in soft coal composite reservoirs have complex extension and energy evolution characteristics. In this study, the mechanism whereby gas outbursts can be eliminated by hydraulic fracturing was revealed. The combined fracturing process of a coal seam and its roof under different in situ stress and fracture spacing conditions was analysed through true triaxial physical tests and numerical simulations. The results showed that the pre-fracturing of the roof had a pressure relief effect on the coal seam, and the secondary pressure relief of the coal seam could be completed at a lower fracture initiation pressure. To ensure the continued presence of the stress shadow effect in actual projects, the fracture spacing should be maintained within the critical range influencing the fracture extension. If the vertical stress is high, a call on increasing the fracture spacing can be taken; otherwise, it must be reduced. In the early phase of fracturing, energy is mostly concentrated at the tip and surface of the fracture; however, the proportion of surface energy for subsequent fracturing is gradually reduced, and the energy is mostly used to open the formation and work on the surrounding matrix. Hydraulic fracturing creates new fractures to interconnect originally heterogeneously distributed gas zones, enabling the entire coal seam to first establish interconnected pressure equilibration, then undergo gradient-controlled depressurization. Hydraulic fracturing can homogenize the stress field and gas pressure field in the original coal seam via communication pressure equalization and reduction decompression, reduce the elastic and extension energies, increase the minimum failure energy required for instability; and realize the elimination of gas outbursts. Our findings provide some theoretical support for the efficient development of coalbed methane and the prevention and control of dynamic gas disasters in coal mines.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 4","pages":"Pages 573-588"},"PeriodicalIF":11.7,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Real-time monitoring and analysis of hydraulic fracturing in surface well using microseismic technology: Case insights and methodological advances","authors":"Yanan Qian ,&nbsp;Ting Liu ,&nbsp;Cheng Zhai ,&nbsp;Hongda Wen ,&nbsp;Yuebing Zhang ,&nbsp;Menghao Zheng ,&nbsp;Hexiang Xu ,&nbsp;Dongyong Xing ,&nbsp;Xinke Gan","doi":"10.1016/j.ijmst.2025.02.009","DOIUrl":"10.1016/j.ijmst.2025.02.009","url":null,"abstract":"<div><div>Through a case analysis, this study examines the spatiotemporal evolution of microseismic (MS) events, energy characteristics, volumetric features, and fracture network development in surface well hydraulic fracturing. A total of 349 MS events were analyzed across different fracturing sections, revealing significant heterogeneity in fracture propagation. Energy scanning results showed that cumulative energy values ranged from 240 to 1060 J across the sections, indicating notable differences. Stimulated reservoir volume (SRV) analysis demonstrated well-developed fracture networks in certain sections, with a total SRV exceeding 1540000 m³. The hydraulic fracture network analysis revealed that during the mid-fracturing stage, the density and spatial extent of MS events significantly increased, indicating rapid fracture propagation and the formation of complex networks. In the later stage, the number of secondary fractures near fracture edges decreased, and the fracture network stabilized. By comparing the branching index, fracture length, width, height, and SRV values across different fracturing sections, Sections No. 1 and No. 8 showed the best performance, with high MS event densities, extensive fracture networks, and significant energy release. However, Sections No. 4 and No. 5 exhibited sparse MS activity and poor fracture connectivity, indicating suboptimal stimulation effectiveness.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 4","pages":"Pages 619-638"},"PeriodicalIF":11.7,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reorientation of hydraulic fractures and stress-shadow effect in double-well fracturing of hydrocarbon reservoirs: 3D numerical model and analysis","authors":"Yang Ju ,&nbsp;Yang Li ,&nbsp;Yongming Yang ,&nbsp;Yongliang Wang","doi":"10.1016/j.ijmst.2025.02.011","DOIUrl":"10.1016/j.ijmst.2025.02.011","url":null,"abstract":"<div><div>Multistage fracturing technology has been used to enhance tight hydrocarbon resource recovery. Determining the proper well spacing and fracturing strategy is crucial for generating a complex fracture network that facilitates oil and gas flow in reservoirs. The stress-shadow effect that occurs between multiple wells significantly affects the development of fracture networks in reservoirs. However, the quantification of the stress-shadow effect and its influence on fracture networks has not been satisfactorily resolved because of the difficulties in detecting and identifying fracture propagation and reorientation in reservoirs. In this study, based on the geological information from the Shengli oilfield, we applied a hybrid finite element-discrete element method to analyze engineering-scale three-dimensional fracture propagation and reorientation by altering well spacings and fracturing strategies. The results indicate that the fracturing area generated by the synchronous fracturing scheme is much smaller than those generated by the sequential and alternative schemes. An alternative hydrofracturing scheme is optimal with respect to fracturing area. The stress-blind area was defined to quantify the mechanical disturbance between adjacent wells. Our study improves the understanding of the effect of fracturing schemes on fracture networks and the impact of independent factors contributing to stress-shadow effects.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 4","pages":"Pages 499-517"},"PeriodicalIF":11.7,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Eco-friendly collectors in apatite froth flotation: A review","authors":"Gabriela Budemberg ,&nbsp;Rickard Jolsterå ,&nbsp;Saeed Chehreh Chelgani","doi":"10.1016/j.ijmst.2025.02.010","DOIUrl":"10.1016/j.ijmst.2025.02.010","url":null,"abstract":"<div><div>The global reliance on phosphate rock for agriculture and other industries, coupled with chemical regulations in developed countries, has driven the search for green alternatives in apatite flotation. This review investigates eco-friendly collectors’ effectiveness in promoting sustainable mineral processing, guiding future alternatives to traditional reagents. The manuscript discussed the surface properties of apatite and its interaction with eco-friendly collectors, assessing existing fundamental studies. This study sought to: (1) define, organize, and classify “eco-friendly” collectors; (2) evaluate their effect in IEP and contact angle; (3) provide a better understanding of the adsorption behavior of the different fatty acid chains into apatite surface; (4) assess their ability to reversely and directly float apatite; (5) address gaps to achieve selectivity and process optimization. Outcomes demonstrated that fatty acids are largely applied, but other renewable sources of these reagents have been promisingly evaluated. In addition, other natural reagents have been tested, and new green synthetics have demonstrated synergistic effects when combined with fatty acids, yielding significant improvements in grade and recovery. However, collector effectiveness varies with ore characteristics, like particle size and surface properties, which remain underexplored. Future research should design tailored collectors that align with mineralogical differences to enhance selectivity.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 4","pages":"Pages 539-551"},"PeriodicalIF":11.7,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel permeability calculation model to simultaneously quantify the impacts of pore and fracture with full feature size","authors":"Minghui Li ,&nbsp;Banghong Zhang ,&nbsp;Zhouqian Wu ,&nbsp;Shaochen Luo ,&nbsp;Jun Lu ,&nbsp;Dongming Zhang ,&nbsp;Heping Xie","doi":"10.1016/j.ijmst.2025.03.003","DOIUrl":"10.1016/j.ijmst.2025.03.003","url":null,"abstract":"<div><div>The permeability of rocks is of utmost importance in the exploitation of deep geological resources. Current characterizations of rock permeability typically consider the influence of either pores or fractures alone. However, deep reservoir rock formations are subjected to complex environments with coupling of high temperature and stress. As a result, deep reservoir rocks possess a complex structure comprising of pores and fractures, making it challenging to understand their impact on permeability. Comprehending this relationship is vital for the secure and efficient exploitation of deep geological resources. This study presents a permeability calculation model that enables simultaneously quantify the impacts of pore and fracture with full feature size. The model independently considers large-scale fractures’ fractal properties and tortuosity while also addressing the distribution and size of small-scale pores. A tortuosity expression that incorporates the effects of thermal damage has been developed using the pore geometric elasticity method. Considering the distinct contributions of pores and fractures to rock permeability, a comprehensive rock permeability calculation model is established. This model has two main strengths: it thoroughly characterizes the influence of pore structures on permeability at multiple scales and precisely details how fractal attributes of fractures affect permeability. To validate the applicability of the model, this study conducted seepage experiments and microscopic observations, capturing the variations in permeability under thermo-mechanical coupling, while quantifying the geometric characteristics and spatial distribution of pores and fractures within the rock. By comparing the measured permeability results, the theoretical values demonstrated a commendable fit. In comparison to previous models, this innovative approach more accurately captures various flow characteristics of the rock under the influence of thermo-mechanical coupling.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 4","pages":"Pages 609-618"},"PeriodicalIF":11.7,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic impact simulation tests of deep roadways affected by high stress and fault slip","authors":"Qi Wang ,&nbsp;Yuncai Wang ,&nbsp;Zhenhua Jiang ,&nbsp;Hongpu Kang ,&nbsp;Chong Zhang ,&nbsp;Bei Jiang","doi":"10.1016/j.ijmst.2025.03.005","DOIUrl":"10.1016/j.ijmst.2025.03.005","url":null,"abstract":"<div><div>As coal mining depth increases, the combined effects of high stress, mining stress, and fault structures make dynamic impact hazards more frequent. The reproduction of dynamic impact phenomena is basis for studying their occurrence patterns and control mechanisms. Physical simulation test represents an efficacious methodology. However, there is currently a lack of simulation devices that can effectively simulate two types of dynamic impact phenomena, including high stress and fault slip dynamic impact. To solve aforementioned issues, the physical simulation test system for dynamic impact in deep roadways developed by authors is employed to carry out comparative tests of high stress and fault slip dynamic impact. The phenomena of high stress and fault slip dynamic impact are reproduced successfully. A comparative analysis is conducted on dynamic phenomena, stress evolution, roadway deformation, and support force. The high stress dynamic impact roadway instability mode, which is characterized by the release of high energy accompanied by symmetric damage, and the fault slip dynamic impact roadway instability mode, which is characterized by the propagation of unilateral stress waves accompanied by asymmetric damage, are clarified. On the basis, the differentiated control concepts for different types of dynamic impact in deep roadways are proposed.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 4","pages":"Pages 519-537"},"PeriodicalIF":11.7,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Key techniques for precise measuring gas content in deep coal mine: In-situ pressure- and gas-preserved coring","authors":"Ju Li ,&nbsp;Jianan Li ,&nbsp;Tianyu Wang ,&nbsp;Guikang Liu ,&nbsp;Zhiqiang He ,&nbsp;Cong Li ,&nbsp;Heping Xie","doi":"10.1016/j.ijmst.2025.03.004","DOIUrl":"10.1016/j.ijmst.2025.03.004","url":null,"abstract":"<div><div>Gas content serves as a critical indicator for assessing the resource potential of deep coal mines and forecasting coal mine gas outburst risks. However, existing sampling technologies face challenges in maintaining the integrity of gas content within samples and are often constrained by estimation errors inherent in empirical formulas, which results in inaccurate gas content measurements. This study introduces a lightweight, in-situ pressure- and gas-preserved corer designed to collect coal samples under the pressure conditions at the sampling point, effectively preventing gas loss during transfer and significantly improving measurement accuracy. Additionally, a gas migration model for deep coal mines was developed to elucidate gas migration characteristics under pressure-preserved coring conditions. The model offers valuable insights for optimizing coring parameters, demonstrating that both minimizing the coring hole diameter and reducing the pressure difference between the coring-point pressure and the original pore pressure can effectively improve the precision of gas content measurements. Coring tests conducted at an experimental base validated the performance of the corer and its effectiveness in sample collection. Furthermore, successful horizontal coring tests conducted in an underground coal mine roadway demonstrated that the measured gas content using pressure-preserved coring was 34% higher than that obtained through open sampling methods.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 4","pages":"Pages 589-607"},"PeriodicalIF":11.7,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}