International Journal of Mining Science and Technology最新文献

{"title":"Intermittent disturbance mechanical behavior and fractional deterioration mechanical model of rock under complex true triaxial stress paths","authors":"Zhi Zheng ,&nbsp;Hongyu Xu ,&nbsp;Kai Zhang ,&nbsp;Guangliang Feng ,&nbsp;Qiang Zhang ,&nbsp;Yufei Zhao","doi":"10.1016/j.ijmst.2023.11.007","DOIUrl":"10.1016/j.ijmst.2023.11.007","url":null,"abstract":"<div><p>Mechanical excavation, blasting, adjacent rockburst and fracture slip that occur during mining excavation impose dynamic loads on the rock mass, leading to further fracture of damaged surrounding rock in three-dimensional high-stress and even causing disasters. Therefore, a novel complex true triaxial static-dynamic combined loading method reflecting underground excavation damage and then frequent intermittent disturbance failure is proposed. True triaxial static compression and intermittent disturbance tests are carried out on monzogabbro. The effects of intermediate principal stress and amplitude on the strength characteristics, deformation characteristics, failure characteristics, and precursors of monzogabbro are analyzed, intermediate principal stress and amplitude increase monzogabbro strength and tensile fracture mechanism. Rapid increases in microseismic parameters during rock loading can be precursors for intermittent rock disturbance. Based on the experimental result, the new damage fractional elements and method with considering crack initiation stress and crack unstable stress as initiation and acceleration condition of intermittent disturbance irreversible deformation are proposed. A novel three-dimensional disturbance fractional deterioration model considering the intermediate principal stress effect and intermittent disturbance damage effect is established, and the model predicted results align well with the experimental results. The sensitivity of stress states and model parameters is further explored, and the intermittent disturbance behaviors at different <em>f</em> are predicted. This study provides valuable theoretical bases for the stability analysis of deep mining engineering under dynamic loads.</p></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 1","pages":"Pages 117-136"},"PeriodicalIF":11.8,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2095268623001611/pdfft?md5=3228423215622c25e302110c4b354829&pid=1-s2.0-S2095268623001611-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139435382","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":"Preliminary research and scheme design of deep underground in situ geo-information detection experiment for Geology in Time","authors":"Heping Xie ,&nbsp;Ru Zhang ,&nbsp;Zetian Zhang ,&nbsp;Yinshuang Ai ,&nbsp;Jianhui Deng ,&nbsp;Yun Chen ,&nbsp;Yong Zhou ,&nbsp;Mingchuan Li ,&nbsp;Liqiang Liu ,&nbsp;Mingzhong Gao ,&nbsp;Zeqian Yang ,&nbsp;Weiqiang Ling ,&nbsp;Heng Gao ,&nbsp;Qijun Hao ,&nbsp;Kun Xiao ,&nbsp;Chendi Lou","doi":"10.1016/j.ijmst.2023.12.004","DOIUrl":"10.1016/j.ijmst.2023.12.004","url":null,"abstract":"<div><p>The deep earth, deep sea, and deep space are the main parts of the national “three deep” strategy, which is in the forefront of the strategic deployment clearly defined in China’s 14th Five-Year Plan (2021–2025) and the Long-Range Objectives Through the Year 2035. It is important to reveal the evolutionary process and mechanism of deep tectonics to understand the earth’s past, present and future. The academic connotation of Geology in Time has been given for the first time, which refers to the multi-field evolution response process of geological bodies at different time and spatial scales caused by geological processes inside and outside the Earth. Based on the deep in situ detection space and the unique geological environment of China Jinping Underground Laboratory, the scientific issue of the correlation mechanism and law between deep internal time-varying and shallow geological response is given attention. Innovative research and frontier exploration on deep underground in situ geo-information detection experiments for Geology in Time are designed to be carried out, which will have the potential to explore the driving force of Geology in Time, reveal essential laws of deep earth science, and explore innovative technologies in deep underground engineering.</p></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 1","pages":"Pages 1-13"},"PeriodicalIF":11.8,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2095268624000016/pdfft?md5=09f0b39da291feca453bd920f8752918&pid=1-s2.0-S2095268624000016-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139420077","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":"Creep constitutive model considering nonlinear creep degradation of fractured rock","authors":"Wang Chunping ,&nbsp;Liu Jianfeng ,&nbsp;Chen Liang ,&nbsp;Liu Jian ,&nbsp;Wang Lu ,&nbsp;Liao Yilin","doi":"10.1016/j.ijmst.2023.11.008","DOIUrl":"10.1016/j.ijmst.2023.11.008","url":null,"abstract":"<div><p>Stability analysis of underground constructions requires a model study of rock masses’ long-term performance. Creep tests under different stress conditions was conducted on intact granite and granite samples fractured at 30° and 45° angles. The experimental results indicate that the steady creep strain rates of intact and fractured rock present an exponential increase trend with the increase of stress level. A nonlinear creep model is developed based on the experimental results, in which the initial damage caused by fracture together with the damage caused by constant load have been taken into consideration. The fitting analysis results indicated that the model proposed is more accurate at identifying the full creep regions in fractured granite, especially the accelerated stage of creep deformation. The least-square fit error of the proposed creep model is significantly lower than that of Nishihara model by almost an order of magnitude. An analysis of the effects of elastic modulus, viscosity coefficient, and damage factors on fractured rock strain rate and creep strain is conducted. If no consideration is given to the effects of the damage, the proposed nonlinear creep model can degenerate into to the classical Nishihara model.</p></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 1","pages":"Pages 105-116"},"PeriodicalIF":11.8,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2095268623001623/pdfft?md5=23a670b6790015ee2329e0f47d535423&pid=1-s2.0-S2095268623001623-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139494762","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":"Heat transfer and temperature evolution in underground mining-induced overburden fracture and ground fissures: Optimal time window of UAV infrared monitoring","authors":"Yixin Zhao ,&nbsp;Kangning Zhang ,&nbsp;Bo Sun ,&nbsp;Chunwei Ling ,&nbsp;Jihong Guo","doi":"10.1016/j.ijmst.2023.11.006","DOIUrl":"10.1016/j.ijmst.2023.11.006","url":null,"abstract":"<div><p>Heat transfer and temperature evolution in overburden fracture and ground fissures are one of the essential topics for the identification of ground fissures via unmanned aerial vehicle (UAV) infrared imager. In this study, discrete element software UDEC was employed to investigate the overburden fracture field under different mining conditions. Multiphysics software COMSOL were employed to investigate heat transfer and temperature evolution of overburden fracture and ground fissures under the influence of mining condition, fissure depth, fissure width, and month alternation. The UAV infrared field measurements also provided a calibration for numerical simulation. The results showed that for ground fissures connected to underground goaf (Fissure I), the temperature difference increased with larger mining height and shallow buried depth. In addition, Fissure I located in the boundary of the goaf have a greater temperature difference and is easier to be identified than fissures located above the mining goaf. For ground fissures having no connection to underground goaf (Fissure II), the heat transfer is affected by the internal resistance of the overlying strata fracture when the depth of Fissure II is greater than 10 m, the temperature of Fissure II gradually equals to the ground temperature as the fissures’ depth increases, and the fissures are difficult to be identified. The identification effect is most obvious for fissures larger than 16 cm under the same depth. In spring and summer, UAV infrared identification of mining fissures should be carried out during nighttime. This study provides the basis for the optimal time and season for the UAV infrared identification of different types of mining ground fissures.</p></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 1","pages":"Pages 31-50"},"PeriodicalIF":11.8,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S209526862300160X/pdfft?md5=cc2290e81eaf3971d47eaf82c74efe30&pid=1-s2.0-S209526862300160X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139400741","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":"IFC: Editorial","authors":"","doi":"10.1016/s2095-2686(23)00155-6","DOIUrl":"https://doi.org/10.1016/s2095-2686(23)00155-6","url":null,"abstract":"Abstract not available","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"28 1","pages":""},"PeriodicalIF":11.8,"publicationDate":"2023-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139059966","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":"Morphological evolution and flow conduction characteristics of fracture channels in fractured sandstone under cyclic loading and unloading","authors":"Quanle Zou, Zihan Chen, Jinfei Zhan, Chunmei Chen, Shikang Gao, Fanjie Kong, Xiaofeng Xia","doi":"10.1016/j.ijmst.2023.11.003","DOIUrl":"https://doi.org/10.1016/j.ijmst.2023.11.003","url":null,"abstract":"<p>In coal mining, rock strata are fractured under cyclic loading and unloading to form fracture channels. Fracture channels are the main flow narrows for gas. Therefore, expounding the flow conductivity of fracture channels in rocks on fluids is significant for gas flow in rock strata. In this regard, graded incremental cyclic loading and unloading experiments were conducted on sandstones with different initial stress levels. Then, the three-dimensional models for fracture channels in sandstones were established. Finally, the fracture channel percentages were used to reflect the flow conductivity of fracture channels. The study revealed how the particle size distribution of fractured sandstone affects the formation and expansion of fracture channels. It was found that a smaller proportion of large blocks and a higher proportion of small blocks after sandstone fails contribute more to the formation of fracture channels. The proportion of fracture channels in fractured rock can indicate the flow conductivity of those channels. When the proportion of fracture channels varies gently, fluids flow evenly through those channels. However, if the proportion of fracture channels varies significantly, it can greatly affect the flow rate of fluids. The research results contribute to revealing the morphological evolution and flow conductivity of fracture channels in sandstone and then provide a theoretical basis for clarifying the gas flow pattern in the rock strata of coal mines.</p>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"29 1","pages":""},"PeriodicalIF":11.8,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138582935","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":"Mechanical response and microscopic damage mechanism of pre-flawed sandstone subjected to monotonic and multilevel cyclic loading: A laboratory-scale investigation","authors":"Kesheng Li, Shengqi Yang, Chuanxiao Liu, Yun Chen, Guanglei Zhang, Qing Ma","doi":"10.1016/j.ijmst.2023.11.002","DOIUrl":"https://doi.org/10.1016/j.ijmst.2023.11.002","url":null,"abstract":"<p>This study aims to investigate the mechanical response and acoustic emission (AE) characteristic of pre-flawed sandstone under both monotonic and multilevel constant-amplitude cyclic loads. Specifically, we explored how coplanar flaw angle and load type impact the strength and deformation behavior and microscopic damage mechanism. Results indicated that being fluctuated before rising with increasing fissure angle under monotonic loading, the peak strength of the specimen first increased slowly and then steeply under cyclic loading. The effect of multilevel cyclic loading on the mechanical parameters was more significant. For a single fatigue stage, the specimen underwent greater deformation in early cycles, which subsequently stabilized. Similar variation pattern was also reflected by AE count/energy/<em>b</em>-value. Crack behaviors were dominated by the fissure angle and load type and medium-scale crack accounted for 74.83%–86.44% of total crack. Compared with monotonic loading, crack distribution of specimen under cyclic loading was more complicated. Meanwhile, a simple model was proposed to describe the damage evolution of sandstone under cyclic loading. Finally, SEM images revealed that the microstructures at the fracture were mainly composed of intergranular fracture, and percentage of transgranular fracture jumped under cyclic loading due to the rapid release of elastic energy caused by high loading rate.</p>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"21 1","pages":""},"PeriodicalIF":11.8,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138679307","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":"3D forward modeling and response characteristics of low-resistivity overburden of the CFS-PML absorbing boundary for ground-well transient electromagnetic method","authors":"Lijuan Zhao, Mingzhong Gao, Nengzhong Lei, Hongfei Duan, Weizhong Qiu, Zhaoying Chen","doi":"10.1016/j.ijmst.2023.10.005","DOIUrl":"https://doi.org/10.1016/j.ijmst.2023.10.005","url":null,"abstract":"<p>This study used the stable and convergent Dufort-Frankel method to differentially discretize the diffusion equation of the ground-well transient electromagnetic secondary field. The absorption boundary condition of complex frequency-shifted perfectly matched layer (CFS-PML) was used for truncation so that the low-frequency electromagnetic wave can be better absorbed at the model boundary. A typical three-dimensional (3D) homogeneous half-space model was established and a low-resistivity cube model was analyzed under the half-space condition. The response patterns and drivers of the low-resistivity cube model were discussed under the influence of a low-resistivity overburden. The absorption boundary conditions of CFS-PML significantly affected the low-frequency electromagnetic waves. For a low-resistivity cube around the borehole, its response curve exhibited a single-peak, and the extreme point of the curve corresponded to the center of the low-resistivity body. When the low-resistivity cube was directly below the borehole, the response curve showed three extreme values (two high and one low), with the low corresponding to the center of the low-resistivity body. The total field response of the low-resistivity overburden was stronger than that of the uniform half-space model due to the low-resistivity shielding effect of electromagnetic waves. When the receiving-transmitting distance gradually increased, the effect of the low-resistivity overburden was gradually weakened, and the response of the low-resistivity cube was strengthened. It was affected by the ratio of the overburden resistivity to the resistivity of the low-resistivity body.</p>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"20 1","pages":""},"PeriodicalIF":11.8,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138657741","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":"Mechanism of gas pressure action during the initial failure of coal containing gas and its application for an outburst inoculation","authors":"Chaojie Wang, Lutan Liu, Xiaowei Li, Changhang Xu, Kai Li","doi":"10.1016/j.ijmst.2023.11.001","DOIUrl":"https://doi.org/10.1016/j.ijmst.2023.11.001","url":null,"abstract":"<p>Faced with the continuous occurrence of coal and gas outburst (hereinafter referred to as “outburst”) disasters, as a main controlling factor in the evolution process of an outburst, for gas pressure, it is still unclear about the phased characteristics of the coupling process with in situ stress, which induce coal damage and instability. Therefore, in the work based on the mining stress paths induced by typical outburst accidents, the gradual and sudden change of three-dimensional stress is taken as the background for the mechanical reconstruction of the disaster process. Then the true triaxial physical experiments are conducted on the damage and instability of coal containing gas under multiple stress paths. Finally, the response characterization between coal damage and gas pressure has been clarified, revealing the mechanism of action of gas pressure during the initial failure of coals. And the main controlling mechanism during the outburst process is elucidated in the coupling process of in situ stress with gas pressure. The results show that during the process of stress loading and unloading, the original gas pressure enters the processes of strengthening and weakening the action ability successively. And the strengthening effect continues to the period of large-scale destruction of coals. The mechanical process of gas pressure during the initial failure of coals can be divided into three stages: the enhancement of strengthening action ability, the decrease of strengthening action ability, and the weakening action ability. The entire process is implemented by changing the dominant action of in situ stress into the dominant action of gas pressure. The failure strength of coals is not only affected by its original mechanical strength, but also by the stress loading and unloading paths, showing a particularly significant effect. Three stages can be divided during outburst inoculation process. That is, firstly, the coals suffer from initial damage through the dominant action of in situ stress with synergy of gas pressure; secondly, the coals with spallation of structural division are generated through the dominant action of gas pressure with synergy of in situ stress, accompanied by further fragmentation; and finally, the fractured coals suffer from fragmentation and pulverization with the gas pressure action. Accordingly, the final broken coals are ejected out with the gas action, initiating an outburst. The research results can provide a new perspective for deepening the understanding of coal and gas outburst mechanism, laying a theoretical foundation for the innovation of outburst prevention and control technologies.</p>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"455 1","pages":""},"PeriodicalIF":11.8,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138583036","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":"Extraction and imaging of indicator elements for non-destructive, in-situ, fast identification of adverse geology in tunnels","authors":"Fumin Liu, Peng Lin, Zhenhao Xu, Ruiqi Shao, Tao Han","doi":"10.1016/j.ijmst.2023.10.006","DOIUrl":"https://doi.org/10.1016/j.ijmst.2023.10.006","url":null,"abstract":"<p>The lag in quantitative methods and detection techniques for geologic information has resulted in time-consuming and human-experienced geologic analysis in tunnels. Geochemical indicators of rocks can be used to identify adverse geology and to explain the intrinsic causes of damage to normal rocks. This study proposes a method to identify adverse geology by extracting and imaging the indicator elements. The mapping relationship between rock components and geologic bodies is quickly determined by indicator element extraction based on factor analysis, and then the data are gridded for image output. The location and size of the target adverse geology are visually identified through the distribution images of the indicator elements, thus reducing data dimensions and analysis time. A non-destructive, in-situ and fast element detection technique in tunnels was adopted to speed up the process of geology identification. The accuracy of the detection was validated by comparing field and laboratory test results. This study further confirms and refines the previous research, and the results provide references for geological, mining and underground projects.</p>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"6 1","pages":""},"PeriodicalIF":11.8,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138582961","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}