International Journal of Mining Science and Technology最新文献

{"title":"Damage and fracture law of outburst coal bodies in tectonic zones under impact disturbances","authors":"Lingran Ren, Liping Li, Jupeng Tang, Yishan Pan, Song Yang, Xin Zhang","doi":"10.1016/j.ijmst.2025.08.002","DOIUrl":"https://doi.org/10.1016/j.ijmst.2025.08.002","url":null,"abstract":"The geological tectonic zone is closely related to outburst. Taking the outburst coal bodies in tectonic zones as the research object, combined with DIC and AE monitoring technologies and discrete element simulation, the mechanical response, crack evolution and energy characteristics of coal bodies under different loading rates (impact disturbances) were studied. The results show that both the uniaxial compressive strength and elastic modulus are positively correlated with the loading rate, with a maximum increase in compressive strength of 25.15 %. The uniaxial compressive strength is more sensitive to impact disturbances. The failure modes of coal bodies can be divided into the “slip-crack synchronization (S & C) type” and the “crack-first-then-slip (C & S) type”. The slip in tectonic zones is more severe at high loading rates. At low loading rates, shear cracks dominate (60.01 %), while the proportion of tensile cracks increases significantly (70.52 %) at high loading rates. Additionally, the rate of axial crack growth decreases as the loading rate increases. The peak values of total energy and dissipated energy increase significantly with the loading rate, and the peak energy of the C & S type is greater than that of the S & C type. Energy is preferentially released through the slip of tectonic zones and the propagation of radial cracks.","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"162 1","pages":""},"PeriodicalIF":11.8,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145103411","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 approach to quantify the true flotation recovery of floatable minerals using natural entrainment tracers and particle-based separation modeling","authors":"Ali Hassan ,&nbsp;Martin Rudolph ,&nbsp;Luis Vinnett ,&nbsp;Kerstin Eckert ,&nbsp;Lucas Pereira","doi":"10.1016/j.ijmst.2025.06.012","DOIUrl":"10.1016/j.ijmst.2025.06.012","url":null,"abstract":"<div><div>In froth flotation, overall recovery of the floatable particles consists of true recovery and recovery by entrainment, where entrainment refers to the non-selective recovery of particles in the concentrate. To understand and optimize the flotation process with regard to process conditions, it is essential to distinguish true flotation recovery from overall recovery. The established methods rely on tailored flotation experiments, unrealistic flotation conditions, or using external tracers which can be different in density and crystal structure to the mineral(s) of interest. This study presents an approach to utilize naturally occuring suitable tracers to estimate the entrainment component from overall recovery of individual particles by establishing a relationship between their settling velocity coefficient and recovery probability. Recovery probabilities of individual particles are computed using particle-based separation modelling. The approach is demonstrated for a copper ore, where naturally occurring rutile was used as the tracer to determine the entrained component of the overall recovery of chalcopyrite particles. Laboratory flotation experiments revealed that entrainment accounted for up to 6% of the overall recovery probability of fully liberated chalcopyrite particles in the fine size fractions. This approach provides a practical method for entrainment correction enabling a more accurate evaluation of true flotation recovery.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 8","pages":"Pages 1233-1244"},"PeriodicalIF":13.7,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145229838","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 a dynamic early warning model for gas outbursts using adaptive fractal dimension characterization","authors":"Jie Chen ,&nbsp;Wenhao Shi ,&nbsp;Yichao Rui ,&nbsp;Junsheng Du ,&nbsp;Xiaokang Pan ,&nbsp;Xiang Peng ,&nbsp;Xusheng Zhao ,&nbsp;Qingfeng Wang ,&nbsp;Deping Guo ,&nbsp;Yulin Zou ,&nbsp;Dafa Yin ,&nbsp;Yuanbin Luo","doi":"10.1016/j.ijmst.2025.07.004","DOIUrl":"10.1016/j.ijmst.2025.07.004","url":null,"abstract":"<div><div>To address the issues of single warning indicators, fixed thresholds, and insufficient adaptability in coal and gas outburst early warning models, this study proposes a dynamic early warning model for gas outbursts based on adaptive fractal dimension characterization. By analyzing the nonlinear characteristics of gas concentration data, an adaptive window fractal analysis method is introduced. Combined with box-counting dimension and variation of box dimension metrics, a cross-scale dynamic warning model for disaster prevention is established. The implementation involves three key phases: First, wavelet denoising and interpolation methods are employed for raw data preprocessing, followed by validation of fractal characteristics. Second, an adaptive window cross-scale fractal dimension method is proposed to calculate the box-counting dimension of gas concentration, enabling effective capture of multi-scale complex features. Finally, dynamic threshold partitioning is achieved through membership functions and the 3<em>σ</em> principle, establishing a graded classification standard for the mine gas disaster (<em>M</em>_GD) index. Validated through engineering applications at Shoushan #1 Coal Mine in Henan Province, the results demonstrate that the adaptive window fractal dimension curve exhibits significantly enhanced fluctuation characteristics compared to fixed window methods, with local feature detection capability improved and warning accuracy reaching 86.9%. The research reveals that this model effectively resolves the limitations of traditional methods in capturing local features and dependency on subjective thresholds through multi-indicator fusion and threshold optimization, providing both theoretical foundation and practical tool for coal mine gas outburst early warning.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 8","pages":"Pages 1245-1257"},"PeriodicalIF":13.7,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145229840","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":"Harnessing sediment voids of low-grade salt mines for compressed air energy storage: Experimental and theoretical insights","authors":"Qihang Li ,&nbsp;Wei Liu ,&nbsp;Liangliang Jiang ,&nbsp;Yiwen Ju ,&nbsp;Aliakbar Hassanpouryouzband ,&nbsp;Guimin Zhang ,&nbsp;Xiangzhao Kong ,&nbsp;Jun Xu","doi":"10.1016/j.ijmst.2025.07.001","DOIUrl":"10.1016/j.ijmst.2025.07.001","url":null,"abstract":"<div><div>Renewable energy storage technologies are critical for transitioning to sustainable energy systems, with salt caverns playing a significant role in large-scale solutions. In water-soluble mining of low-grade salt formations, insoluble impurities and interlayers detach during salt dissolution and accumulate as sediment at the cavern base, thereby reducing the storage capacity and economic viability of salt cavern gas storage (SCGS). This study investigates sediment formation mechanisms, void distribution, and voidage in the Huai’an low-grade salt mine, introducing a novel self-developed physical simulation device for two butted-well horizontal (TWH) caverns that replicates compressed air injection and brine discharge. Experiments comparing “one injection and one discharge” and “two injections and one discharge” modes revealed that (1) compressed air effectively displaces brine from sediment voids, (2) a 0.5 MPa injection pressure corresponds to a 10.3 MPa operational lower limit in practice, aligning with field data, and (3) sediment voidage is approximately 46%, validated via air-brine interface theory. The “two injections and one discharge” mode outperformed in both discharge volume and rate. Additionally, a mathematical model for brine displacement via compressed air was established. These results provide foundational insights for optimizing compressed air energy storage (CAES) in low-grade salt mines, advancing their role in renewable energy integration.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 8","pages":"Pages 1303-1322"},"PeriodicalIF":13.7,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145229839","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":"Theory and simulation investigations on stability control of gob-side entry retaining with coal pillar-backfill body system","authors":"Dong Zhang ,&nbsp;Qiancheng Zhu ,&nbsp;Jianbiao Bai ,&nbsp;Rui Wang ,&nbsp;Zizheng Zhang ,&nbsp;Hao Fu ,&nbsp;Shuaigang Liu ,&nbsp;Shuai Yan ,&nbsp;Yonghong Guo ,&nbsp;Zhijun Tian ,&nbsp;Wenda Wu","doi":"10.1016/j.ijmst.2025.07.012","DOIUrl":"10.1016/j.ijmst.2025.07.012","url":null,"abstract":"<div><div>Gob-side entry retaining (GER) is widely applied in China. Nevertheless, the stability mechanism of the GER with coal pillar-backfill body (CPBB) under dynamic overburden load remains unexplored. A voussoir beam structure (VBS) model is established to analyze roof structure stability during panel advancement, introducing a VBS stability criterion. Reducing block B length <em>l</em> and immediate roof damage variable <em>D</em>, and increasing coal pillar width <em>x</em>_c, lowers the GER structure instability risk. Reducing <em>l</em> and the GER width <em>w</em> leads to a CPBB system stability upswing. A UDEC model was established to systematically reveal how the <em>l</em>, backfill body width <em>x</em>_b, and strength affect the stability and coupling performance of the CPPB system by monitoring the crack damage <em>D</em>_C. Simulation results indicate that at <em>l</em>=14 m, <em>x</em>_b=2.0 m, water-cement ratio 1.5:1, the coal pillar and backfill body have similar <em>D</em>_C but maintain stability, resulting in CPPB system coupling degree <em>Ϗ</em> better. A novel GER method supported by the CPBB was implemented on-site. Monitoring results indicated that the coal pillar peak stresses were 19.17 MPa (ahead), 16.14 MPa (behind), and the backfill body peak stress was 12.27 MPa (maximum). The floor heave was 380 mm, with a 103 mm backfill body rib.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 8","pages":"Pages 1399-1417"},"PeriodicalIF":13.7,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145229848","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":"Advances in thermo-hydro-mechanical-chemical modelling for CO2 geological storage and utilization","authors":"Nanlin Zhang ,&nbsp;Liangliang Jiang ,&nbsp;Fushen Liu ,&nbsp;Yuhao Luo ,&nbsp;Lele Feng ,&nbsp;Yiwen Ju ,&nbsp;Allegra Hosford Scheirer ,&nbsp;Jiansheng Zhang ,&nbsp;Birol Dindoruk ,&nbsp;S.M. Farouq Ali ,&nbsp;Zhangxin Chen","doi":"10.1016/j.ijmst.2025.07.010","DOIUrl":"10.1016/j.ijmst.2025.07.010","url":null,"abstract":"<div><div>Geological storage and utilization of CO₂ involve complex interactions among Thermo-hydro-mechanical-chemical (THMC) coupling processes, which significantly affect storage integrity and efficiency. To address the challenges in accurately simulating these coupled phenomena, this paper systematically reviews recent advances in the mathematical modeling and numerical solution of THMC coupling in CO₂ geological storage. The study focuses on the derivation and structure of governing and constitutive equations, the classification and comparative performance of fully coupled, iteratively coupled, and explicitly coupled solution methods, and the modeling of dynamic changes in porosity, permeability, and fracture evolution induced by multi-field interactions. Furthermore, the paper evaluates the capabilities, application scenarios, and limitations of major simulation platforms, including TOUGH, CMG-GEM, and COMSOL. By establishing a comparative framework integrating model formulations and solver strategies, this work clarifies the strengths and gaps of current approaches and contributes to the development of robust, scalable, and mechanism-oriented numerical models for long-term prediction of CO₂ behavior in geological formations.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 8","pages":"Pages 1379-1397"},"PeriodicalIF":13.7,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145229847","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":"Depth-dependent mechanical-seepage behavior and safety mining distance of the steeply inclined coal mine underground reservoir","authors":"Ersheng Zha ,&nbsp;Hongfei Duan ,&nbsp;Mingbo Chi ,&nbsp;Jiulin Fan ,&nbsp;Jianjun Hu ,&nbsp;Baoyang Wu ,&nbsp;Cong Yu ,&nbsp;Jiancheng Tong","doi":"10.1016/j.ijmst.2025.07.006","DOIUrl":"10.1016/j.ijmst.2025.07.006","url":null,"abstract":"<div><div>Coal mine underground reservoir (CMUR) technology mitigates water scarcity in China’s coal-rich western regions but lacks tailored solutions for steeply inclined coal seams. This study develops a novel framework of steeply inclined coal mine underground reservoirs (SICMUR), which is a paradigm shift from conventional CMUR that the coal seam itself serves as the reservoir floor, challenging conventional designs due to depth-dependent permeability and mechanical constraints. Triaxial mechanical-seepage tests on Xinjiang Wudong coal samples (100, 200, 300 m depths) revealed a 3.5 MPa triaxial strength increase per 100 m depth and a 58-fold post-peak permeability surge at 300 versus 100 m. Similar model simulations revealed mining-induced stress redistribution and significant deformation effects, particularly subsidence and water-conducting fractures during lower coal seam mining. Results indicate a minimum 40 m safety distance between reservoirs and lower coal seams. Critical construction parameters were investigated for Wudong mine SICMUR as collapse zone heights (9.9–12.31 m) and water-conducting fracture zone heights (31.96–37.40 m). This work systematically bridges SICMUR concepts to field implementation, offering a framework for water preservation in steeply inclined mining while addressing safety concerns, providing a new approach for water reservation in steeply inclined coal mining.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 8","pages":"Pages 1341-1355"},"PeriodicalIF":13.7,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145229843","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":"Fault reactivation and seismic risks induced by deep reservoir fracturing: Mechanisms, prediction and perspectives","authors":"Yang Ju ,&nbsp;Guoming Fu ,&nbsp;Hongwei Zhou ,&nbsp;Shirong Ge ,&nbsp;Suping Peng","doi":"10.1016/j.ijmst.2025.06.005","DOIUrl":"10.1016/j.ijmst.2025.06.005","url":null,"abstract":"<div><div>With the advancement of fracturing technologies in deeper and more geologically complex formations, fault reactivation and induced seismicity have attracted increasing attention. The increasing frequency and magnitude of these events underscore the need for a robust understanding of the governing physical mechanisms. Elevated pore pressure, modified fault-loading conditions, and aseismic slip are widely acknowledged as the primary drivers. Recent studies have explored these mechanisms under varying factors, including fluid properties, rock ductility, poroelastic responses, and evolving fault stress states, thereby offering critical insights into model refinement. Probabilistic forecasting approaches, which combine statistical analyses of historical data with real-time monitoring, are being increasingly adopted in seismic risk assessments. In parallel, machine learning techniques are employed to process large seismic datasets and identify key patterns. However, their predictive capabilities remain limited by geological heterogeneity, subsurface complexity, and scarce observational data. Moreover, fluid–rock interactions further complicate the development of universally applicable models, thereby constraining the generalizability of mitigation strategies. This review synthesizes the current understanding of induced seismicity mechanisms, evaluates the prevailing prediction and mitigation methods, and identifies major challenges and future research directions. Advancements in these areas are essential to enhancing seismic risk management and ensuring the safe, sustainable development of deep-subsurface energy resources.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 8","pages":"Pages 1211-1232"},"PeriodicalIF":13.7,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145230067","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":"Depression of pyrrhotite superstructures in copper flotation: A synchrotron X-ray powder diffraction and DFT study","authors":"Alireza Rezvani ,&nbsp;Foad Raji ,&nbsp;Rong Fan ,&nbsp;R. Kappes ,&nbsp;Zhiyong Gao ,&nbsp;Yongjun Peng","doi":"10.1016/j.ijmst.2025.07.002","DOIUrl":"10.1016/j.ijmst.2025.07.002","url":null,"abstract":"<div><div>Pyrrhotite naturally occurs in various superstructures including magnetic (4C) and non-magnetic (5C, 6C) types, each with distinct physicochemical properties and flotation behaviors. Challenges in accurately identifying and quantifying these superstructures hinder the optimization of pyrrhotite depression in flotation processes. To address this critical issue, synchrotron X-ray powder diffraction (S-XRPD) with Rietveld refinement was employed to quantify the distribution of superstructures in the feed and flotation concentrates of a copper–gold ore. To elucidate the mechanisms influencing depression, density functional theory (DFT) calculations were conducted to explore the electronic structures and surface reactivity of the pyrrhotite superstructures toward the adsorption of water, oxygen and hydroxyl ions (OH⁻) as dominant species present in the flotation process. S-XRPD analysis revealed that flotation recovery rates of pyrrhotite followed the order of 4C&lt;6C&lt;5C. DFT calculations indicated that the Fe 3d and S 3p orbital band centers exhibited a similar trend relative to the Fermi level with 4C being the closest. The Fe 3d band center suggested that the 4C structure possessed a more reactive surface toward the oxygen reduction reaction, promoting the formation of hydrophilic Fe-OH sites. The S 3p band center order also implied that xanthate on the non-magnetic 5C and 6C surfaces could oxidize to dixanthogen, increasing hydrophobicity and floatability, while 4C formed less hydrophobic metal-xanthate complexes. Adsorption energy and charge transfer analyses of water, hydroxyl ions and molecular oxygen further supported the high reactivity and hydrophilic nature of 4C pyrrhotite. The strong bonding with hydroxyl ions indicated enhanced surface passivation by hydrophilic Fe–OOH complexes, aligning with the experimentally observed flotation order (4C&lt;6C&lt;5C). These findings provide a compelling correlation between experimental flotation results and electronic structure calculations, delivering crucial insights for optimizing flotation processes and improving pyrrhotite depression. This breakthrough opens up new opportunities to enhance the efficiency of flotation processes in the mining industry.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 8","pages":"Pages 1259-1270"},"PeriodicalIF":13.7,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145229841","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 multi-dimensional percussion method for efficient drilling in HDR formations: Rock fragmentation mechanism, drilling energy analysis, and performance optimization","authors":"Zhaowei Sun ,&nbsp;Xiaoguang Wu ,&nbsp;Zhongwei Huang ,&nbsp;Gensheng Li ,&nbsp;Xianzhi Song ,&nbsp;Zongjie Mu ,&nbsp;Huaizhong Shi ,&nbsp;Wenhao He ,&nbsp;Berdiev Alisher","doi":"10.1016/j.ijmst.2025.07.005","DOIUrl":"10.1016/j.ijmst.2025.07.005","url":null,"abstract":"<div><div>Percussion drilling is a promising approach for hot dry rock (HDR) fragmentation. However, understanding of HDR fragmentation mechanism under multi-dimensional percussion remains limited and hinders the corresponding drilling performance. Herein, an innovative true triaxial multi-dimensional percussion device was developed for the study of HDR fragmentation mechanism under in-situ temperature and stress conditions. Multi-dimensional percussion, involving both axial and torsional components, was applied to drilling in granite and carbonatite rocks sampled from the typical HDR target areas. Multi-scale visualization techniques and a whale optimization-variational mode decomposition algorithm were employed to investigate the rock failure patterns and drilling energy characteristics. Results indicated that multi-dimensional percussion enhances brittle-ductile mixed failure in granite, characterized by transgranular, intergranular, and combined fracture patterns that promote rock cracking. In contrast, carbonatite drillhole displays enhanced brittle fragmentation and tortuous failure surface dominated by transgranular fracture pattern. Frequency-domain characteristics of penetration force signals for multi-dimensional percussion, especially the significant dominant frequency, amplitude, and high-frequency dissipation, indicate an increase in net energy for drilling into HDR and intensified rock fragmentation. Further, the effect of impact frequency on rock fragmentation performance was emphasized to maximize drilling efficiency. The optimal regulation schemes between axial and torsional impact frequencies are identified as 15 Hz + 15 Hz for granite and 30 Hz + 15 Hz for carbonatite. The reliability of the optimization approach was validated through a field test that employed a novel impactor in the geothermal well Fushen-1.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 8","pages":"Pages 1271-1301"},"PeriodicalIF":13.7,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145229842","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}