Journal of Central South University最新文献_第6页

Three-dimensional pseudo-dynamic reliability analysis of seismic shield tunnel faces combined with sparse polynomial chaos expansion 结合稀疏多项式混沌展开的抗震盾构隧道面三维伪动态可靠性分析

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-07-23 DOI: 10.1007/s11771-024-5698-0

Feng-qi Guo, Shi-wei Li, Jin-Feng Zou

{"title":"Three-dimensional pseudo-dynamic reliability analysis of seismic shield tunnel faces combined with sparse polynomial chaos expansion","authors":"Feng-qi Guo, Shi-wei Li, Jin-Feng Zou","doi":"10.1007/s11771-024-5698-0","DOIUrl":"https://doi.org/10.1007/s11771-024-5698-0","url":null,"abstract":"To address the seismic face stability challenges encountered in urban and subsea tunnel construction, an efficient probabilistic analysis framework for shield tunnel faces under seismic conditions is proposed. Based on the upper-bound theory of limit analysis, an improved three-dimensional discrete deterministic mechanism, accounting for the heterogeneous nature of soil media, is formulated to evaluate seismic face stability. The metamodel of failure probabilistic assessments for seismic tunnel faces is constructed by integrating the sparse polynomial chaos expansion method (SPCE) with the modified pseudo-dynamic approach (MPD). The improved deterministic model is validated by comparing with published literature and numerical simulations results, and the SPCE-MPD metamodel is examined with the traditional MCS method. Based on the SPCE-MPD metamodels, the seismic effects on face failure probability and reliability index are presented and the global sensitivity analysis (GSA) is involved to reflect the influence order of seismic action parameters. Finally, the proposed approach is tested to be effective by a engineering case of the Chengdu outer ring tunnel. The results show that higher uncertainty of seismic response on face stability should be noticed in areas with intense earthquakes and variation of seismic wave velocity has the most profound influence on tunnel face stability.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical study of directional heat transfer in composite materials via controllable carbon fiber distribution 通过可控碳纤维分布对复合材料中定向传热的数值研究

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-07-23 DOI: 10.1007/s11771-024-5666-8

Lei Shi, Cun-wen Huang, Jian-ling Ye, Shuang Wen, Su-ping Liu, Fen-qiang Li, Tian Zhou, Zhi-qiang Sun

{"title":"Numerical study of directional heat transfer in composite materials via controllable carbon fiber distribution","authors":"Lei Shi, Cun-wen Huang, Jian-ling Ye, Shuang Wen, Su-ping Liu, Fen-qiang Li, Tian Zhou, Zhi-qiang Sun","doi":"10.1007/s11771-024-5666-8","DOIUrl":"https://doi.org/10.1007/s11771-024-5666-8","url":null,"abstract":"Carbon fiber reinforced polyamide 12 (CF/PA12), a new material renowned for its excellent mechanical and thermal properties, has drawn significant industry attention. Using the steady-state research to heat transfer, a series of simulations to investigate the heat transfer properties of CF/PA12 were conducted in this study. Firstly, by building two- and three-dimensional models, the effects of the porosity, carbon fiber content, and arrangement on the heat transfer of CF/PA12 were examined. A validation of the simulation model was carried out and the findings were consistent with those of the experiment. Then, the simulation results using the above models showed that within the volume fraction from 0% to 28%, the thermal conductivity of CF/PA12 increased greatly from 0.0242 W/(m·K) to 10.8848 W/(m·K). The increasing porosity had little influence on heat transfer characteristic of CF/PA12. The direction of the carbon fiber arrangement affects the heat transfer impact, and optimal outcomes were achieved when the heat flow direction was parallel to the carbon fiber. This research contributes to improving the production methods and broadening the application scenarios of composite materials.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing rock fragmentation prediction in mining operations: A Hybrid GWO-RF model with SHAP interpretability 加强采矿作业中的岩石破碎预测：具有 SHAP 可解释性的 GWO-RF 混合模型

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-07-18 DOI: 10.1007/s11771-024-5699-z

Yu-lin Zhang, Yin-gui Qin, Danial Jahed Armaghsni, Masoud Monjezi, Jian Zhou

{"title":"Enhancing rock fragmentation prediction in mining operations: A Hybrid GWO-RF model with SHAP interpretability","authors":"Yu-lin Zhang, Yin-gui Qin, Danial Jahed Armaghsni, Masoud Monjezi, Jian Zhou","doi":"10.1007/s11771-024-5699-z","DOIUrl":"https://doi.org/10.1007/s11771-024-5699-z","url":null,"abstract":"In the mining industry, precise forecasting of rock fragmentation is critical for optimising blasting processes. In this study, we address the challenge of enhancing rock fragmentation assessment by developing a novel hybrid predictive model named GWO-RF. This model combines the Grey Wolf Optimization (GWO) algorithm with the Random Forest (RF) technique to predict the D80 value, a critical parameter in evaluating rock fragmentation quality. The study is conducted using a dataset from Sarcheshmeh copper mine, employing six different swarm sizes for the GWO-RF hybrid model construction. The GWO-RF model’s hyperparameters are systematically optimized within established bounds, and its performance is rigorously evaluated using multiple evaluation metrics. The results show that the GWO-RF hybrid model has higher predictive skills, exceeding traditional models in terms of accuracy. Furthermore, the interpretability of the GWO-RF model is enhanced through the utilization of SHapley Additive exPlanations (SHAP) values. The insights gained from this research contribute to optimizing blasting operations and rock fragmentation outcomes in the mining industry.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141737422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessing the range of blasting-induced cracks in the surrounding rock of deeply buried tunnels based on the unified strength theory 基于统一强度理论评估爆破引起的深埋隧道围岩裂缝范围

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-06-29 DOI: 10.1007/s11771-024-5672-x

Liang Li, Jia-jun Chen, Lian-heng Zhao, Ke-pei He, Shi-hong Hu, Hua-long Li

{"title":"Assessing the range of blasting-induced cracks in the surrounding rock of deeply buried tunnels based on the unified strength theory","authors":"Liang Li, Jia-jun Chen, Lian-heng Zhao, Ke-pei He, Shi-hong Hu, Hua-long Li","doi":"10.1007/s11771-024-5672-x","DOIUrl":"https://doi.org/10.1007/s11771-024-5672-x","url":null,"abstract":"Blasting-induced cracks in the rock surrounding deeply buried tunnels can result in water gushing and rock mass collapse, posing significant safety risks. However, previous theoretical studies on the range of blasting-induced cracks often ignore the impact of the in-situ stress, especially that of the intermediate principal stress. The particle displacement−crack radius relationship was established in this paper by utilizing the blasthole cavity expansion equation, and theoretical analytical formulas of the stress−displacement relationship and the crack radius were derived with unified strength theory to accurately assess the range of cracks in deep surrounding rock under a blasting load. Parameter analysis showed that the crushing zone size was positively correlated with in-situ stress, intermediate principal stress, and detonation pressure, whereas negatively correlated with Poisson ratio and decoupling coefficient. The dilatancy angle-crushing zone size relationship exhibited nonmonotonic behavior. The relationships in the crushing zone and the fracture zone exhibited opposite trends under the influence of only in-situ stress or intermediate principal stress. As the in-situ stress increased from 0 to 70 MPa, the rate of change in the crack range and the attenuation rate of the peak vibration velocity gradually slowed.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141509970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental investigation of vibration pretreatment-microwave curing process for carbon fiber reinforced resin matrix composites 碳纤维增强树脂基复合材料振动预处理-微波固化工艺的实验研究

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-06-27 DOI: 10.1007/s11771-024-5664-x

De-chao Zhang, Li-hua Zhan, Bo-lin Ma, Shun-ming Yao, Jin-zhan Guo, Cheng-long Guan, Shu Liu

{"title":"Experimental investigation of vibration pretreatment-microwave curing process for carbon fiber reinforced resin matrix composites","authors":"De-chao Zhang, Li-hua Zhan, Bo-lin Ma, Shun-ming Yao, Jin-zhan Guo, Cheng-long Guan, Shu Liu","doi":"10.1007/s11771-024-5664-x","DOIUrl":"https://doi.org/10.1007/s11771-024-5664-x","url":null,"abstract":"The vibration pretreatment-microwave curing process is an efficient, low energy consumption, and high-quality out-of-autoclave curing process for carbon fiber resin matrix composites. This study aims to investigate the impact of vibration pretreatment temperature on the fiber weight content, microscopic morphology and mechanical properties of the composite laminates by using optical digital microscopy, universal tensile testing machine and thermogravimetric analyzer. Additionally, the combined mode of Bragg fiber grating sensor and temperature measurement fiber was employed to explore the effect of vibration pretreatment on the strain process during microwave curing. The study results revealed that the change in vibration pretreatment temperature had a slight impact on the fiber weight content when the vibration acceleration remained constant. The metallographic and interlaminar strength of the specimen formed at a vibration pretreatment temperature of 80 °C demonstrated a porosity of 0.414% and a 10.69% decrease in interlaminar shear strength compared to autoclave curing. Moreover, the introduction of the vibration energy field during the microwave curing process led to a significant reduction in residual strain in both the 0° and 90° fiber directions, when the laminate was cooled to 60 °.\u0000","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141509971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Excess energy characteristics of true triaxial multi-faceted rapid unloading rockburst 真三轴多面快速卸荷岩爆的过能特性

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-06-24 DOI: 10.1007/s11771-024-5658-8

Jie-yu Li, Dong-qiao Liu, Man-chao He, Jin-song Yang

{"title":"Excess energy characteristics of true triaxial multi-faceted rapid unloading rockburst","authors":"Jie-yu Li, Dong-qiao Liu, Man-chao He, Jin-song Yang","doi":"10.1007/s11771-024-5658-8","DOIUrl":"https://doi.org/10.1007/s11771-024-5658-8","url":null,"abstract":"Delayed rockburst experiments with different numbers of unloading surfaces (DNUS) were performed using an independently developed true triaxial multisurface unloading rockburst experimental system. Based on the rockburst excess energy theory, the energy storage characteristics, excess energy, excess energy release rate (EERR), and crack evolution characteristics of rockbursts with DNUS were studied, and the following main conclusions were obtained. The occurrence of rockbursts is mainly due to the generation of an excess energy ΔE. ΔE depends on the elastic strain energy stored in the rock before the rockburst, the energy input by the equipment after the peak, and the residual elastic strain energy. As the DNUS increases, ΔE gradually decreases, but the EERR value increases, and the rockburst becomes increasingly severe; Rapid unloading of the specimen under true triaxial high-pressure loading will produce an unloading platform in the stress–strain curve, causing unloading damage. The damage is mainly concentrated near the free surface in the form of tension failure, and the unloading damage gradually increases with increasing DNUS; Tensile cracks play a dominant role in the damage and destruction of sandstone. In the final rockburst stage, the slope of the shear crack curve was greater than that of the tensile cracks, indicating that shear cracks were a critical factor affecting the instability and failure of the specimen.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141510030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Leaching of copper slags by direct photooxidation mechanism using ultraviolet light 利用紫外线的直接光氧化机制沥滤铜渣

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-06-24 DOI: 10.1007/s11771-023-5534-y

Zeynel Abidin Sari, M. Deniz Turan

{"title":"Leaching of copper slags by direct photooxidation mechanism using ultraviolet light","authors":"Zeynel Abidin Sari, M. Deniz Turan","doi":"10.1007/s11771-023-5534-y","DOIUrl":"https://doi.org/10.1007/s11771-023-5534-y","url":null,"abstract":"The dissolution behaviors of Cu and Fe from copper slags were investigated with photochemical reactions. Experiments were run intermittently with a quartz glass jacket in a glass reactor, by submerging ultraviolet (UV) lamps and using glass tube as an air supply distributed under the reactor. The behaviors of UVA (365 nm), UVB (311 nm), UVC (254 nm), and vacuum-UV (VUV) (185 nm) light at different wavelengths in a leaching solution were examined. All experiments were conducted comparatively in the presence and absence of UV lamps under identical conditions. The adaptation of the radical formation mechanism to the leaching environment and its usability in leaching by creating an oxidative solution medium were investigated. In the experiments in the UV light (185 nm) and non-UV light environments under optimum conditions, the copper extraction rates were obtained as 85.1% and 70.7%, respectively. In conclusion, the metal dissolution (Cu) behaviors at optimum conditions during leaching from copper slags in the photoreactor systems with UV (185 nm) light were more efficient than those without UV light. Moreover, photochemical reactor is a new approach to adapt them to hydrometallurgy applications and examine the process.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141510018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparing Fe-Cr-Ni alloy by utilization of limonitic nickel laterite sinter 利用褐铁矿红土镍烧结矿制备铁铬镍合金

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-06-24 DOI: 10.1007/s11771-024-5573-z

Yu-xiao Xue, De-qing Zhu, Jian Pan, Zhi-xiong You, Xue-wei Lyu

引用次数: 0

Strength and fracture properties of coral concrete under impact of coral aggregate type and fiber hybridization 珊瑚骨料类型和纤维杂化影响下的珊瑚混凝土强度和断裂性能

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-06-24 DOI: 10.1007/s11771-024-5654-z

Zhen-bo Wang, Wei-kang Liu, Jian-ping Zuo, Yu-dong Han, Peng-fei Li, Ru-sheng Hao

{"title":"Strength and fracture properties of coral concrete under impact of coral aggregate type and fiber hybridization","authors":"Zhen-bo Wang, Wei-kang Liu, Jian-ping Zuo, Yu-dong Han, Peng-fei Li, Ru-sheng Hao","doi":"10.1007/s11771-024-5654-z","DOIUrl":"https://doi.org/10.1007/s11771-024-5654-z","url":null,"abstract":"Seawater coral aggregate concrete (SCAC) has demonstrated advantages in reducing material cost and energy consumption of marine infrastructure on reefs and islands. However, SCAC exhibits increased brittleness and higher dependency on coral aggregate type as its strength increases. In this study, two types of coral aggregates are used to compare their influence on SCAC performance. Flexible fiber and rigid fiber are blended to improve the strength, toughness, and fracture properties of SCAC. The results show that the compressive strength of SCAC incorporating low-strength coral aggregate is reduced by 30.8% when comparing to that containing high-strength coral aggregate (from 55.6 to 38.5 MPa). Fiber incorporation could mitigate the strength reduction that originated from weaker coral aggregates. A novel constitutive model is proposed to describe the stress-deformation curves of SCAC. Good agreement between the model prediction and test data is observed. Relative to reference group, the fracture energies of SCAC adding 0.1%, 0.2%, and 0.3% polyvinyl alcohol fibers are increased by 10%, 49%, and 88% respectively. The fracture energies of hybrid fiber groups are 46% higher than that of mono fiber groups with the same fiber dosage.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141510024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative thermodynamic analysis of gold dissolution in four organic carboxylic acid-catalyzed thiosulfate systems using Eh–pH and species distribution diagrams 利用 Eh-pH 和物种分布图对金在四种有机羧酸催化的硫代硫酸盐体系中的溶解进行热力学比较分析

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-06-24 DOI: 10.1007/s11771-024-5572-0

Jun-nan Chen, Feng Xie, Wei Wang, Yun-long Bai

{"title":"Comparative thermodynamic analysis of gold dissolution in four organic carboxylic acid-catalyzed thiosulfate systems using Eh–pH and species distribution diagrams","authors":"Jun-nan Chen, Feng Xie, Wei Wang, Yun-long Bai","doi":"10.1007/s11771-024-5572-0","DOIUrl":"https://doi.org/10.1007/s11771-024-5572-0","url":null,"abstract":"The non-ammonia thiosulfate leaching system is considered to be an attractive and eco-friendly route for gold leaching without the usage of cyanide or ammonia. In this paper, the role of four organic carboxylic acids, named oxalic acid (Ox), malic acid (Mal), citric acid (Cit), and tartaric acid (Tart) in copper-thiosulfate system has been studied comparatively. Based on the available thermodynamic data, a series of Eh–pH and species distribution diagrams for copper-Ox/Mal/Cit/Tart-thiosulfate system under various conditions have been constructed from thermodynamic calculation. The results show that thiosulfate is the only effective complexing agent for aurous ions, while the organic carboxylic acids work as a copper ligand. The copper-Mal/Cit/Tart-thiosulfate system exhibits potential advantages over the traditional copper-ammonia-thiosulfate system, such as wider pH range and lower thiosulfate consumption. The calculation also indicates the redox potentials of Cu(II)/Cu(I) for the leaching systems are in the subsequence of E0[Cu(Ox)22−/Cu(S2O3)35−] >E0[Cu(NH3)42+/Cu(S2O3)35−] >E0[Cu2(Mal)2H−22−/Cu(S2O3)35−] ≈E0[Cu2(Cit)2H−24−/Cu(S2O3)35−] > E0[Cu(Tart)2H−46−/Cu(S2O3)35−]. Increasing thiosulfate concentration leads to a sharp decline in the content of copper-Ox/Mal/Cit/Tart complex, and the stability of the formed cupric complex follows the descending order of tartaric acid>citric acid>malic acid>oxalic acid.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141510019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0