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Logging response prediction of high-lithium coal seam based on K-means clustering algorithm 基于 K-means 聚类算法的高锂度煤层测井响应预测
IF 2.9 3区 地球科学
Frontiers in Earth Science Pub Date : 2024-08-15 DOI: 10.3389/feart.2024.1443458
Xiwei Mu, Yanming Zhu, Kailong Dou, Ying Shi, Manli Huang
{"title":"Logging response prediction of high-lithium coal seam based on K-means clustering algorithm","authors":"Xiwei Mu, Yanming Zhu, Kailong Dou, Ying Shi, Manli Huang","doi":"10.3389/feart.2024.1443458","DOIUrl":"https://doi.org/10.3389/feart.2024.1443458","url":null,"abstract":"Lithium in coal, as a new type of associated mineral resource, has considerable potential for exploration. Exploration of high-lithium coal seams is essential for developing and using the associated lithium resources. To explore the distribution of lithium resources in the early stages of development in coal seams, the relationship between coal seam logging data and lithium content was analyzed by taking Guojiadi Coal Mine (China) as example. By analyzing the correlation between the different logging curves and the lithium content in coal and combining the K-means algorithm to identify the logging characteristics of different lithium-containing coal seams, we finally obtained the logging identification characteristics of high-lithium coal seams. The results reveal differences in the logging curves of coal seams with different lithium contents. The natural gamma and lateral resistivity of high-lithium coal seams are approximately 80 API and 100 Ω.M, respectively. Our study shows that the early identification of high-lithium coal seams can be evaluated from a logging perspective. We propose a preliminary identification method of high-lithium coal seam based on logging curve parameters by clustering analysis of borehole logging data to achieve accurate prediction.","PeriodicalId":12359,"journal":{"name":"Frontiers in Earth Science","volume":"3 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Deep structure of the Wulong goldfield, Liaodong Peninsula, China, revealed by receiver functions: implications for the tectonic and mineralization dynamics 接收函数揭示的中国辽东半岛乌龙金矿区深部结构:对构造和成矿动力学的影响
IF 2.9 3区 地球科学
Frontiers in Earth Science Pub Date : 2024-08-15 DOI: 10.3389/feart.2024.1437605
Fan Zheng, Tao Xu, Yinshuang Ai, Yunping Ge, Qingdong Zeng, Laicheng Miao, Weiyu Dong, José Badal
{"title":"Deep structure of the Wulong goldfield, Liaodong Peninsula, China, revealed by receiver functions: implications for the tectonic and mineralization dynamics","authors":"Fan Zheng, Tao Xu, Yinshuang Ai, Yunping Ge, Qingdong Zeng, Laicheng Miao, Weiyu Dong, José Badal","doi":"10.3389/feart.2024.1437605","DOIUrl":"https://doi.org/10.3389/feart.2024.1437605","url":null,"abstract":"During the Mesozoic, the North China Craton experienced intense tectonic movements that resulted in the formation of numerous gold deposits on the Liaodong and Jiaodong Peninsulas in northeastern China. To investigate the relationship between deep crustal structure and gold mineralization in the Liaodong Peninsula, we deployed 334 dense seismic stations in the Wulong goldfield (WLGF) with the idea of analysing numerous receiver functions at different array stations. The purpose focused on knowing the potential for gold mineralization in the area. The study revealed the following: (1) The WLGF is characterized by a crustal thickness of approximately 32 km and an average Vp/Vs ratio of 1.76. The high value of the Vp/Vs ratio near the Wulong gold deposit suggests that mantle materials have penetrated into the crust and contributed to the mineralization process. (2) A low-velocity layer located at a depth of 10–18 km below the WLGF seems to support the existence of a potentially brittle-ductile transition zone. Also, hydrothermal magma upwelling channels are observed in the upper crust beneath the Wulong gold deposit. (3) The presence of a discontinuous low-velocity layer in the middle crust beneath the Liaodong Peninsula suggests promising prospects for gold ore exploration. The receiver functions method based on a dense seismic array employed in this study can offer valuable references and guidance for the fine exploration and research of ore deposits in other regions globally.","PeriodicalId":12359,"journal":{"name":"Frontiers in Earth Science","volume":"39 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Robustness of characteristics of the Matuyama-Brunhes geomagnetic field reversal found in global models 全球模型中发现的松山-布鲁内斯地磁场反转特征的稳健性
IF 2.9 3区 地球科学
Frontiers in Earth Science Pub Date : 2024-08-15 DOI: 10.3389/feart.2024.1443095
Ahmed Nasser Mahgoub, Monika Korte, Sanja Panovska, Maximilian Schanner
{"title":"Robustness of characteristics of the Matuyama-Brunhes geomagnetic field reversal found in global models","authors":"Ahmed Nasser Mahgoub, Monika Korte, Sanja Panovska, Maximilian Schanner","doi":"10.3389/feart.2024.1443095","DOIUrl":"https://doi.org/10.3389/feart.2024.1443095","url":null,"abstract":"Paleomagnetic data enables the global reconstruction of the geomagnetic field, allowing the investigation of significant events like polarity reversals and excursions. When compared to prior polarity reversals, the most recent one, the Matuyama-Brunhes (MB), is the best recorded reversal in terms of number of available paleomagnetic data. Nevertheless, several of these data have poor age control, and they are not distributed equally worldwide. Few global models have been presented for the MB; the most recent is the GGFMB (Global Geomagnetic Field Model for the MB reversal). Limitations imposed by input data and subjective assumptions about the data that are made in modelling restrict the resolution and reliability of these models. This study presents a suite of eight additional global models that reconstruct the magnetic field during the interval 700–900 ka ago, including the MB reversal and Kamikatsura (KKT) excursion. Through model comparisons, the robustness of the models in resolving MB reversal characteristics is assessed. The majority of models indicate that the reversal was mainly driven by the axial dipole field contribution gradually decreasing, while non-dipole parts slightly increased. At the core-mantle boundary, two high-latitude reverse flux patches appear at the beginning of the reversal, and it seems like a few precursors in the form of regionally seen transitional field occurred, related to variations in the decaying dipole moment. The main global polarity change occurred close to 778 ka, with the axial dipole quickly strengthening in the opposite direction in the following, completing the full polarity transition. All the models confirm the previously reported asymmetry of slow dipole decay and fast recovery, and indicate that the dipole moment was clearly lower in the late Matuyama than the early Brunhes. The whole reversal process occurred on average between 800 and 770 ka, with a duration of approximately 30 kyr. Out of four apparent excursions discovered in some of the models between 900 and 800 ka, the KKT excursion (890–884 ka), can be confirmed as a robust magnetic field feature. Additional, well dated paleomagnetic records in particular from the southern hemisphere are required to confirm several details suggested by the models that should only be interpreted with caution so far.","PeriodicalId":12359,"journal":{"name":"Frontiers in Earth Science","volume":"5 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142223641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigating the dynamics of water and sediment disruption due to impeller action in silt-rich reservoir zones of inland waterways in China 中国内河富淤泥库区叶轮作用引起的水流和泥沙扰动动态研究
IF 2.9 3区 地球科学
Frontiers in Earth Science Pub Date : 2024-08-15 DOI: 10.3389/feart.2024.1427707
Hao Wang, Yu Wang, Kaiqing Liu, Tianfeng Luo, Jinping Li, Ying Zhang, Tian Miao, Miao Tian, Zhehui Wang, Xiaolong Zhang
{"title":"Investigating the dynamics of water and sediment disruption due to impeller action in silt-rich reservoir zones of inland waterways in China","authors":"Hao Wang, Yu Wang, Kaiqing Liu, Tianfeng Luo, Jinping Li, Ying Zhang, Tian Miao, Miao Tian, Zhehui Wang, Xiaolong Zhang","doi":"10.3389/feart.2024.1427707","DOIUrl":"https://doi.org/10.3389/feart.2024.1427707","url":null,"abstract":"Introduction: This study investigates the characteristics of sediment disturbance caused by impeller rotation in reservoirs of inland rivers with high sediment content in China. A scaled experimental model, reflecting typical environmental conditions of inland water reservoirs in Northwest China, was established in Lanzhou, Gansu Province, following the principle of similarity.Methods: The study integrates numerical simulations using Ansys Fluent software and corroborates the findings through hydraulic experiments. Computational Fluid Dynamics (CFD) and the κ–ε Realizable model were employed to simulate the solid-liquid mixing process, which was verified against the experimental model.Results: The results indicate that increasing the impeller velocity from 2 rad/s to 8 rad/s, while submerged at a depth of 1000 mm in the flow field, enhances the rate of bottom sediment suspension. Furthermore, the rate of suspended sediment discharge from the model outlet increased with inflow velocity ranging from 0.1 m/s to 0.8 m/s. A decrease in the impeller’s submersion depth from 600 mm to 1200 mm was found to reduce the maximum disturbance radius affecting the bottom sediment.Discussion: The reliability of the simulation was confirmed by comparing the software results with experimental data. This study provides insights into the mechanisms of sediment-laden flow disturbance in the reservoir areas of inland rivers in China and lays the groundwork for more comprehensive investigations into sediment discharge in these environments.","PeriodicalId":12359,"journal":{"name":"Frontiers in Earth Science","volume":"18 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142223644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Tephra fall impacts to buildings: the 2017–2018 Manaro Voui eruption, Vanuatu 火山碎屑落下对建筑物的影响:瓦努阿图 2017-2018 年马纳罗-武伊火山爆发
IF 2.9 3区 地球科学
Frontiers in Earth Science Pub Date : 2024-08-15 DOI: 10.3389/feart.2024.1392098
Susanna F. Jenkins, Ame McSporran, Thomas M. Wilson, Carol Stewart, Graham Leonard, Sandrine Cevuard, Esline Garaebiti
{"title":"Tephra fall impacts to buildings: the 2017–2018 Manaro Voui eruption, Vanuatu","authors":"Susanna F. Jenkins, Ame McSporran, Thomas M. Wilson, Carol Stewart, Graham Leonard, Sandrine Cevuard, Esline Garaebiti","doi":"10.3389/feart.2024.1392098","DOIUrl":"https://doi.org/10.3389/feart.2024.1392098","url":null,"abstract":"Building damage from tephra falls can have a substantial impact on exposed communities around erupting volcanoes. There are limited empirical studies of tephra fall impacts on buildings, with none on tephra falls impacting traditional thatched timber buildings, despite their prevalence across South Pacific island nations and parts of Asia. The 2017/2018 explosive eruption of Manaro Voui, Ambae Island, Vanuatu, resulted in damage to traditional (thatched timber), non-traditional (masonry), and hybrid buildings from tephra falls in March/April and July 2018. Field and photographic surveys were conducted across three separate field studies with building characteristics and damage recorded for a total of 589 buildings. Buildings were classified using a damage state framework customised for this study. Overall, increasing tephra thicknesses were related to increasing severity of building damage, corroborating previous damage surveys and vulnerability estimates. Traditional buildings were found to be less resistant to tephra loading than non-traditional buildings, although there was variation in resistance within each building type. For example, some traditional buildings collapsed under ∼40 mm thickness while others sustained no damage when exposed to >200 mm. We attribute this to differences in the pre-eruption condition of the building and the implementation of mitigation strategies. Mitigation strategies included covering thatched roofs with tarpaulins, which helped shed tephra and consequently reduced loading, and providing an internal prop to the main roof beam, which aided structural resistance. As is typical of post-event building damage surveys, we had limited time and access to the exposed communities, and we note the limitations this had for our findings. Our results contribute to the limited empirical data available for tephra fall building damage and can be used to calibrate existing fragility functions, improving our evidence base for forecasting future impacts for similar construction types globally.","PeriodicalId":12359,"journal":{"name":"Frontiers in Earth Science","volume":"28 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on InSAR deformation information extraction and stress state assessment in a railway tunnel in a plateau area 高原铁路隧道 InSAR 变形信息提取与应力状态评估研究
IF 2.9 3区 地球科学
Frontiers in Earth Science Pub Date : 2024-08-07 DOI: 10.3389/feart.2024.1367978
Baihang Lyu, Bo Liu, Binfu Xie, Hairong Xiao, Xing Liu, Ziwen Zhang, Yang Li, Xiameng Huang, Fangzhe Shi
{"title":"Study on InSAR deformation information extraction and stress state assessment in a railway tunnel in a plateau area","authors":"Baihang Lyu, Bo Liu, Binfu Xie, Hairong Xiao, Xing Liu, Ziwen Zhang, Yang Li, Xiameng Huang, Fangzhe Shi","doi":"10.3389/feart.2024.1367978","DOIUrl":"https://doi.org/10.3389/feart.2024.1367978","url":null,"abstract":"Introduction: The study proposes a method for evaluating stress distribution in high-altitude Tibetan Plateau railway tunnels using high-precision radar satellite time-series interferometric synthetic aperture radar technology.Methods: To effectively monitor and prevent geological hazards during the construction process, this method i employed, as it serves as a component of advanced geological prediction and surrounding rock deformation monitoring technology for high-altitude tunnels, particularly in the Dongelu Tunnel of the China–Tibet Railway. The study utilizes time-series interferometric synthetic aperture radar to obtain deformation information for Dongelu Tunnel area between 2022 and 2023 from Sentinel- 1A orbit images. This quantitatively investigates the upper mountain body and line-of-sight direction along the tunnel. The deformation characteristics are correlated with high-frequency and high-precision automated vertical displacement monitoring results, determining the spatiotemporal distribution of tunnel deformation. In this study, a model that determines the vertical stress state of the Dongelu Tunnel under loading near the entrance and evaluates its health status was established.Results: The results show that the surface deformation of the mountain above the tunnel axis develops slowly and is relatively small, with a maximum vertical deformation rate of 1–3 mm/year. The average stress on the tunnel arch is 5.54 MPa, with a fluctuation range of 0.01 MPa. Temporal Q9 changes in various parts of the tunnel are periodic, with maximum fluctuations observed in December 2022. The study reveals inconsistent surface settlement of the tunnel arch and mountain above it, causing minor vertical stress changes. As the tunnel construction progresses, vertical stress variation shows periodicity because of an initial imbalance in internal stress within the mountain. Stress fluctuations near the tunnel entrance occur during the initial excavation phase, gradually diminishing as the project progresses and internal stress stabilizes.Discussion: The proposed tunnel monitoring and stability assessment method can reduce its impact on engineering construction and provide guidance for advanced geological prediction.","PeriodicalId":12359,"journal":{"name":"Frontiers in Earth Science","volume":"56 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Converged ensemble simulations of climate: possible trends in total solar irradiance cannot explain global warming alone 气候集合模拟:太阳总辐照度的可能趋势无法单独解释全球变暖问题
IF 2.9 3区 地球科学
Frontiers in Earth Science Pub Date : 2024-08-06 DOI: 10.3389/feart.2024.1240784
Gábor Drótos, Mátyás Herein, Tímea Haszpra, Imre M. Jánosi
{"title":"Converged ensemble simulations of climate: possible trends in total solar irradiance cannot explain global warming alone","authors":"Gábor Drótos, Mátyás Herein, Tímea Haszpra, Imre M. Jánosi","doi":"10.3389/feart.2024.1240784","DOIUrl":"https://doi.org/10.3389/feart.2024.1240784","url":null,"abstract":"We address the hypothetical question of whether an increasing total solar irradiance (TSI) trend, without anthropogenic contributions, could be sufficient to explain the ongoing global warming. To this end, the intermediate-complexity climate model PlaSim is used. To consider the total internal variability, we present a set of ensemble simulations, with different forcing histories in TSI and CO<jats:sub>2</jats:sub> concentration, that have converged sufficiently tightly to the relevant probability distributions to provide a satisfactory bound on any spurious trend possibly arising from a sampling bias; similar bounds on any other unforced contributions to ensemble mean trends are also estimated. A key point is the consideration, among the forcing histories, the steepest increasing trend in TSI that is still consistent with observations according to a recent study; thereby, we essentially revisit corresponding TSI reconstructions, more than 20 years after their last modeling-based evaluation, by improving the analysis through taking care of all possible sources of error or uncertainty and incorporating data that have become available since then. Without any change in CO<jats:sub>2</jats:sub> concentration, our TSI trend (i.e., and upper bound on actual TSI trends) is found to be insufficient to produce outcomes compatible with the observational record in global mean surface temperature (GMST) with a nonnegligible probability. We formalize our statement for quantifiers of GMST trends through evaluating their distributions over the ensemble, and we speculate that the hypothesis about the exclusive role of an increasing TSI remains implausible even beyond our particular model setup. At the same time, if we consider a constant TSI, and the observational record in CO<jats:sub>2</jats:sub> concentration is applied as forcing, the simulation results and the recorded GMST match well. While we currently need to leave the question of a precise attribution open, we conclude by pointing out that an attribution of the ongoing global warming to an increasing TSI alone could be made plausible only if a bias in the set of land-based instrumental temperature measurements were increasing more rapidly than commonly estimated; an assessment of the latter possibility is out of the scope of our study, as well as addressing solar forcing mechanisms beyond the effect of TSI.","PeriodicalId":12359,"journal":{"name":"Frontiers in Earth Science","volume":"18 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of the sedimentary environment of the Wufeng-Longmaxi shale on organic matter accumulation in the Dingshan area, Sichuan Basin 四川盆地顶山地区五峰-龙马溪页岩沉积环境对有机质积累的影响
IF 2.9 3区 地球科学
Frontiers in Earth Science Pub Date : 2024-08-06 DOI: 10.3389/feart.2024.1457377
Qiang Wang, Yue Feng, Ping Gao, Guangming Meng, Chengang Lu, Qizhang Fan, Gang Li, Yineng Tan, Xianming Xiao
{"title":"Influence of the sedimentary environment of the Wufeng-Longmaxi shale on organic matter accumulation in the Dingshan area, Sichuan Basin","authors":"Qiang Wang, Yue Feng, Ping Gao, Guangming Meng, Chengang Lu, Qizhang Fan, Gang Li, Yineng Tan, Xianming Xiao","doi":"10.3389/feart.2024.1457377","DOIUrl":"https://doi.org/10.3389/feart.2024.1457377","url":null,"abstract":"The sedimentary environment and organic matter (OM) accumulation are vital indicators for shale gas exploration. However, research on deep shale gas systems is relatively limited; moreover, the exploration of deep shale gas in the southeastern Sichuan Basin has entered a period of stagnation. In this study, systematic geochemical analysis of Wufeng (WF) and the first member of the Longmaxi (Long-1) deep shale samples from the recently drilled DY7 well in the Dingshan area of the Sichuan Basin is carried out, and the longitudinal variations in major and trace elements are revealed. The differences in the WF, lower section of the Long-1 (Long-1<jats:sub>1</jats:sub>) and upper section of the Long-1 (Long-1<jats:sub>2</jats:sub>) shales are studied in terms of redox conditions, paleoproductivity, terrigenous detrital input, sedimentation rate and paleoclimate, and the different main controlling factors of OM accumulation for these three layers are discussed. The WF shale has a higher TOC content (mean: 5.73%), the Long-1<jats:sub>1</jats:sub> shale has a high TOC content (mean: 2.89%), while the Long-1<jats:sub>2</jats:sub> shale has a low TOC content (mean: 1.44%). For the WF shale, due to complex geological events and large fluctuations in element contents, its TOC content is poorly correlated with these indices, redox and paleoproductivity proxies have a positive association with the Long-1<jats:sub>1</jats:sub> shale’s TOC content, but negatively correlated with terrigenous input and sedimentation rate indices. The formation of these two sets of organic-rich shales (TOC &amp;gt; 2%) is jointly controlled by good preservation conditions. In contrast, the TOC content of the WF shale is higher than that of the Long-1<jats:sub>1</jats:sub> shale as the result that terrigenous input and sedimentation rate of the Long-1<jats:sub>1</jats:sub> shale represent the dilution and destruction of OM, which is different from the former. During the Long-1<jats:sub>2</jats:sub> depositional period, the water column experienced weak reducing conditions and low productivity, and its high terrigenous debris input further diluted the OM, leading to a low TOC content.","PeriodicalId":12359,"journal":{"name":"Frontiers in Earth Science","volume":"159 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Multifactor-coupled study on freeze-thaw forces of rocks in cold regions 寒冷地区岩石冻融力的多因素耦合研究
IF 2.9 3区 地球科学
Frontiers in Earth Science Pub Date : 2024-08-06 DOI: 10.3389/feart.2024.1404153
Yonghui Zhao, Kun Hu, Deming Han, Yongxian Lang, Lin Zhang
{"title":"Multifactor-coupled study on freeze-thaw forces of rocks in cold regions","authors":"Yonghui Zhao, Kun Hu, Deming Han, Yongxian Lang, Lin Zhang","doi":"10.3389/feart.2024.1404153","DOIUrl":"https://doi.org/10.3389/feart.2024.1404153","url":null,"abstract":"This study delves into the mechanical properties of steep and rocky slopes subjected to long-term freeze-thaw actions. Considering the unique climatic conditions in cold regions, especially the significant impact of seasonal and diurnal temperature variations on slope excavation, the research focuses on a high-cold region iron ore mine. Four types of rocks commonly found in the mining area are thoroughly examined, taking into account the hydrogeological conditions of the mining area. The study systematically analyzes the mechanisms of various factors such as weathering, freeze-thaw cycles, and ice-water phase changes on the stability of cold region fractured rock masses. The research reveals that under prolonged freeze-thaw actions, crack water within the rock continuously undergoes ice-water phase changes, generating substantial freeze expansion forces that result in structural damage to the rock mass. This damage is evident not only in the development of existing microcracks but also leads to the generation of new fractures, ultimately causing deterioration in the rock mass structure. The study of the evolution patterns of freeze-thaw forces contributes to a better understanding of slope stability issues in cold region mineral resource extraction, offering crucial insights for the design, construction, and operation of related engineering projects.","PeriodicalId":12359,"journal":{"name":"Frontiers in Earth Science","volume":"107 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Maximising the value of hyperspectral drill core scanning through real-time processing and analysis 通过实时处理和分析最大化高光谱钻芯扫描的价值
IF 2.9 3区 地球科学
Frontiers in Earth Science Pub Date : 2024-08-06 DOI: 10.3389/feart.2024.1433662
Samuel T. Thiele, Moritz Kirsch, Sandra Lorenz, Houda Saffi, Safia El Alami, Isabel Cecilia Contreras Acosta, Yuleika Madriz, Richard Gloaguen
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