Journal of Central South University最新文献

{"title":"Case study on the mechanics of NPR anchor cable compensation for large deformation tunnel in soft rock in the Transverse Mountain area, China","authors":"Yong Li, Jing Zheng, Shu-sen Huo, Feng-nian Wang, Man-chao He, Zhi-gang Tao","doi":"10.1007/s11771-024-5638-z","DOIUrl":"https://doi.org/10.1007/s11771-024-5638-z","url":null,"abstract":"<p>A study was conducted to analyze the deformation mechanism of strongly weathered quartz schist in the Daliangshan Tunnel, located in the western Transverse Mountain area. A large deformation problem was experienced during the tunnel construction. To mitigate this problem, a support system was designed incorporating negative Poisson ratio (NPR) anchor cables with negative Poisson ratio effect. Physical model experiments, field experiments, and numerical simulation experiments were conducted to investigate the compensation mechanical behavior of NPR anchor cables. The large deformations of soft rocks in the Daliangshan Tunnel are caused by a high ground stress, a high degree of joint fracture development, and a high degree of surrounding rock fragmentation. A compensation mechanics support system combining long and short NPR anchor cables was suggested to provide sufficient counter-support force (approximately 350 kN) for the surrounding rock inside the tunnel. Comparing the NPR anchor cable support system with the original support system used in the Daliangshan tunnel showed that an NPR anchor cable support system, combining cables of 6.3 m and 10.3 m in length, effectively prevented convergence of surrounding rock deformation, and the integrated settlement convergence value remained below 300 mm. This study provides an effective scientific basis for resolving large deformation problems in deeply buried soft rocks in western transverse mountain areas.</p>","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":"141782957","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}

{"title":"Effect of forging on the microstructure and texture of a high Nb containing γ-TiAl alloy","authors":"Hui Tao, Hui-zhong Li, Li Wang, Rui Zhou, Yi-xuan Che, Yong-hui Chen, Xiao-peng Liang","doi":"10.1007/s11771-024-5677-5","DOIUrl":"https://doi.org/10.1007/s11771-024-5677-5","url":null,"abstract":"<p>The effect of forging on the microstructure and texture evolution of a high Nb containing Ti-45Al-7Nb-0.3W (at.%) alloy was investigated by X-ray diffractometer (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results show that the as-cast alloy is mainly composed of <i>α</i>₂/<i>γ</i> lamellar colonies with a mean size of 70 µm, but the hot-forged pancake displays a near duplex microstructure (DP). Kinking and bending of lamellar colonies, deformation twinning and dynamic recrystallization (DRX) occur during hot forging. Meanwhile, dense dislocations in the <i>β</i> phase after forging suggest that the high-temperature <i>β</i> phase with a disordered structure is favorable for improving the hot-workability of the alloy. Unlike the common TiAl casting texture, the solidification process of the investigated as-cast alloy with high Nb content is completely via the <i>β</i> phase region, resulting in the formation of a &lt;110&gt;_<i>γ</i> fiber texture where the &lt;110&gt;_<i>γ</i> aligns parallel to the heat-flow direction. In comparison, the relatively strong &lt;001&gt; and weak &lt;302&gt; texture components in the as-forged alloy are attributed to the deformation twinning. After annealing, static recrystallization occurs at the twin boundary and intersections, which weakens the deformation texture.</p>","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":"141782894","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}

{"title":"Mechanical response and dilatancy characteristics of deep marble under different stress paths: A sight from energy dissipation","authors":"Xiao-hui Liu, Qi-jun Hao, Yu Zheng, Zhao-peng Zhang, Yang Xue","doi":"10.1007/s11771-024-5663-y","DOIUrl":"https://doi.org/10.1007/s11771-024-5663-y","url":null,"abstract":"<p>Dilatancy is a fundamental volumetric growth behavior observed during loading and serves as a key index to comprehending the intricate nonlinear behavior and constitutive equation structure of rock. This study focuses on Jinping marble obtained from the Jinping Underground Laboratory in China at a depth of 2400 m. Various uniaxial and triaxial tests at different strain rates, along with constant confining pressure tests and reduced confining pressure tests under different confining pressures were conducted to analyze the mechanical response and dilatancy characteristics of the marble under four stress paths. Subsequently, a new empirical dilatancy coefficient is proposed based on the energy dissipation method. The results show that brittle failure characteristics of marble under uniaxial compression are more obvious with the strain rate increasing, and plastic failure characteristics of marble under triaxial compression are gradually strengthened. Furthermore, compared to the constant confining pressure, the volume expansion is relatively lower under unloading condition. The energy dissipation is closely linked to the process of dilatancy, with a rapid increase of dissipated energy coinciding with the beginning of dilatancy. A new empirical dilatancy coefficient is defined according to the change trend of energy dissipation rate curve, of which change trend is consistent with the actual dilatancy response in marble under different stress paths. The existing empirical and theoretical dilatancy models are analyzed, which shows that the empirical dilatancy coefficient based on the energy background is more universal.</p>","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":"141782956","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}

{"title":"Solar and wind energy potential assessment for Razavi Khorasan Province in Iran","authors":"Amirpouya Hosseini, Faeze Ramezani, Mojtaba Mirhosseini","doi":"10.1007/s11771-023-5535-x","DOIUrl":"https://doi.org/10.1007/s11771-023-5535-x","url":null,"abstract":"<p>This study aims to evaluate the solar and wind energy potential across Razavi Khorasan Province, Iran, with a specific focus on the Khaf region. A preliminary assessment of mean solar radiation, mean wind speeds, and Weibull distribution parameters was conducted for different towns and zones within the province. The findings showed that Khaf has favorable characteristics for further analysis. The solar and wind energy metrics examined include global horizontal irradiance, clearness index, wind rose patterns, and turbulence intensity. At a height of 40 m, Khaf’s wind power density reached 1650 W/m², indicating exceptional wind energy generation potential. Additionally, Khaf received an average annual solar radiation of 2046 kW·h/m², representing significant solar energy potential. Harnessing these substantial renewable resources in Khaf could allow Razavi Khorasan Province to reduce reliance on fossil fuels, improve energy sustainability, and mitigate climate change impacts. This research contributes an in-depth assessment of Razavi Khorasan’s solar and wind energy potential, particularly for the promising Khaf region. Further work may examine optimal sites for renewable energy projects and grid integration strategies to leverage these resources.</p>","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":"141782955","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}

{"title":"Semi-analytical solution for mechanical analysis of tunnels crossing strike-slip fault zone considering nonuniform fault displacement and uncertain fault plane position","authors":"Heng-hong Yang, Ming-nian Wang, Li Yu, Xiao Zhang","doi":"10.1007/s11771-024-5665-9","DOIUrl":"https://doi.org/10.1007/s11771-024-5665-9","url":null,"abstract":"<p>The tunnel subjected to strike-slip fault dislocation exhibits severe and catastrophic damage. The existing analysis models frequently assume uniform fault displacement and fixed fault plane position. In contrast, post-earthquake observations indicate that the displacement near the fault zone is typically nonuniform, and the fault plane position is uncertain. In this study, we first established a series of improved governing equations to analyze the mechanical response of tunnels under strike-slip fault dislocation. The proposed methodology incorporated key factors such as nonuniform fault displacement and uncertain fault plane position into the governing equations, thereby significantly enhancing the applicability range and accuracy of the model. In contrast to previous analytical models, the maximum computational error has decreased from 57.1% to 1.1%. Subsequently, we conducted a rigorous validation of the proposed methodology by undertaking a comparative analysis with a 3D finite element numerical model, and the results from both approaches exhibited a high degree of qualitative and quantitative agreement with a maximum error of 9.9%. Finally, the proposed methodology was utilized to perform a parametric analysis to explore the effects of various parameters, such as fault displacement, fault zone width, fault zone strength, the ratio of maximum fault displacement of the hanging wall to the footwall, and fault plane position, on the response of tunnels subjected to strike-slip fault dislocation. The findings indicate a progressive increase in the peak internal forces of the tunnel with the rise in fault displacement and fault zone strength. Conversely, an augmentation in fault zone width is found to contribute to a decrease in the peak internal forces. For example, for a fault zone width of 10 m, the peak values of bending moment, shear force, and axial force are approximately 46.9%, 102.4%, and 28.7% higher, respectively, compared to those observed for a fault zone width of 50 m. Furthermore, the position of the peak internal forces is influenced by variations in the ratio of maximum fault displacement of the hanging wall to footwall and the fault plane location, while the peak values of shear force and axial force always align with the fault plane. The maximum peak internal forces are observed when the footwall exclusively bears the entirety of the fault displacement, corresponding to a ratio of 0: 1. The peak values of bending moment, shear force, and axial force for the ratio of 0:1 amount to approximately 123.8%, 148.6%, and 111.1% of those for the ratio of 0.5:0.5, respectively.</p>","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":"141782970","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}

{"title":"Preparation and interface state of phosphate tailing-based geopolymers","authors":"Shou-xun Zhang, Xian Xie, Rui-qi Xie, Xiong Tong, Yu-yao Wu, Jia-wen Li, Yue Li","doi":"10.1007/s11771-024-5669-5","DOIUrl":"https://doi.org/10.1007/s11771-024-5669-5","url":null,"abstract":"<p>The long-term storage of phosphate tailings will occupy a large amount of land, pollute soil and groundwater, thus, it is crucial to achieve the harmless disposal of phosphate tailings. In this study, high-performance geopolymers with compressive strength of 38.8 MPa were prepared by using phosphate tailings as the main raw material, fly ash as the active silicon-aluminum material, and water glass as the alkaline activator. The solid content of phosphate tailings and fly ash was 60% and 40%, respectively, and the water-cement ratio was 0.22. The results of XRD, FTIR, SEM-EDS and XPS show that the reactivity of phosphate tailings with alkaline activator is weak, and the silicon-aluminum material can react with alkaline activator to form zeolite and gel, and encapsulate/cover the phosphate tailings to form a dense phosphate tailings-based geopolymer. During the formation of geopolymers, part of the aluminum-oxygen tetrahedron replaced the silicon-oxygen tetrahedron, causing the polycondensation reaction between geopolymers and increasing the strength of geopolymers. The leaching toxicity test results show that the geopolymer has a good solid sealing effect on heavy metal ions. The preparation of geopolymer from phosphate tailings is an important way to alleviate the storage pressure and realize the resource utilization of phosphate tailings.</p>","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":"141782948","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}

{"title":"Effect of annealing temperature on microstructure and mechanical properties of Mg-Zn-Zr-Nd alloy with large final rolling deformation","authors":"Jin-hai Zhang, Kai-bo Nie, Jin-hua Zhang, Kun-kun Deng, Zhi-long Liu","doi":"10.1007/s11771-024-5675-7","DOIUrl":"https://doi.org/10.1007/s11771-024-5675-7","url":null,"abstract":"<p>In this study, the Mg-3Zn-0.5Zr-<i>χ</i>Nd (<i>χ</i>=0, 0.6) alloys were subjected to final rolling treatment with large deformation of 50%. The impact of annealing temperatures on the microstructure and mechanical properties was investigated. The rolled Mg-3Zn-0.5Zr-0.6Nd alloy exhibited an ultimate tensile strength of 386 MPa, a yield strength of 361 MPa, and an elongation of 7.1%. Annealing at different temperatures resulted in reduced strength and obviously increased elongation for both alloys. Optimal mechanical properties for the Mg-3Zn-0.5Zr-0.6Nd alloy were achieved after annealing at 200 °C, with an ultimate tensile strength of 287 MPa, a yield strength of 235 MPa, and an elongation of 26.1%. The numerous deformed microstructures, twins, and precipitated phases in the rolled alloy could impede the deformation at room temperature and increase the work hardening rate. After annealing, a decrease in the work hardening effect and an increase in the dynamic recovery effect were obtained due to the formation of fine equiaxed grains, and the increased volume fraction of precipitated phases, which significantly improved the elongation of the alloy. Additionally, the addition of Nd element could enhance the annealing recrystallization rate, reduce the Schmid factor difference between basal and prismatic slip systems, facilitate multi-system slip initiation and improve the alloy plasticity.</p>","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":"141782899","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}

{"title":"Heat and mass transfer of a circular porous moist object located in a triangular shaped vented cavity","authors":"Fatih Selimefendigil, Seda Özcan Çoban, Hakan F. Öztop","doi":"10.1007/s11771-023-5335-3","DOIUrl":"https://doi.org/10.1007/s11771-023-5335-3","url":null,"abstract":"<p>Heat and mass transfer of a circular-shaped porous moist object inside a two-dimensional triangle cavity is investigated by using finite element method. The porous object is considered to be a moist food sample, located in the middle of the cavity with inlet and outlet ports with different configurations of inlet/outlet ports. Convective drying performance is numerically assessed for different values of Reynolds numbers (between 50 and 250), dry air inlet temperature (between 40 and 80 °C) and different locations of the port. It is observed that changing the port locations has significant impacts on the flow recirculaitons inside the triangular chamber while convective drying performance is highly affected. The moisture content reduces with longer time and for higher Reynolds number (<i>Re</i>) values. Case P4 where inlet and outlet ports are in the middle of the walls provides the most effective configuration in terms of convective drying performance while the worst case is seen for P1 case where inlet and outlet are closer to the corners of the chamber. There is a 192% difference between the moisture reduction of these two cases at <i>Re</i>=250, <i>T</i>=80 °C and <i>t</i>=120 min.</p>","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":"141782950","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}

{"title":"Fabrication of a novel electrochemical sensor based on MnFe2O4/graphene modified glassy carbon electrode for the sensitive detection of bisphenol A","authors":"Si-lei Gao, Jian-she Tang, Li Xiang, Jin-wei Long","doi":"10.1007/s11771-024-5689-1","DOIUrl":"https://doi.org/10.1007/s11771-024-5689-1","url":null,"abstract":"<p>Manganese ferrite (MnFe₂O₄) has the advantages of simple preparation, high resistivity, and high crystal symmetry. Herein, we have developed an electrochemical sensor utilizing graphene and MnFe₂O₄ nanocomposites modified glassy carbon electrode (GCE), which is very efficient and sensitive to detect bisphenol A (BPA). MnFe₂O₄/graphene (GR) was synthesized by immobilizing the MnFe₂O₄ microspheres on the graphene nanosheets via a simple one-pot solvothermal method. The morphology and structure of the MnFe₂O₄/GR nanocomposite have been characterized through scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). In addition, electrochemical properties of the modified materials are comparably explored by means of cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV). Under the optimal conditions, the proposed electrochemical sensor for the detection of BPA has a linear range of 0.8–400 µmol/L and a detection limit of 0.0235 µmol/L (S/N=3) with high sensitivity, good selectivity and high stability. In addition, the proposed sensor was used to measure the content of BPA in real water samples with a recovery rate of 97.94%–104.56%. At present, the synthesis of MnFe₂O₄/GR provides more opportunities for the electrochemical detection of BPA in practical applications.</p>","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":"141782951","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}

{"title":"Numerical investigation on MHD Jeffery-Hamel nanofluid flow with different nanoparticles using fuzzy extension of generalized dual parametric homotopy algorithm","authors":"Verma Lalchand, Meher Ramakanta","doi":"10.1007/s11771-023-5494-2","DOIUrl":"https://doi.org/10.1007/s11771-023-5494-2","url":null,"abstract":"<p>This study considers an MHD Jeffery-Hamel nanofluid flow with distinct nanoparticles such as copper, Al₂O₃ and SiO₂ between two rigid non-parallel plane walls with the fuzzy extension of the generalized dual parametric homotopy algorithm. The nanofluids have been formulated to enhance the thermophysical characteristics of fluids, including thermal diffusivity, conductivity, convective heat transfer coefficients and viscosity. Due to the presence of distinct nanofluids, a change in the value of volume fraction occurs that influences the velocity profiles of the flow. The short value of nanoparticles volume fraction is considered an uncertain parameter and represented in a triangular fuzzy number range among [0.0, 0.1, 0.2]. A novel generalized dual parametric homotopy algorithm with fuzzy extension is used here to study the fuzzy velocities at various channel positions. Finally, the effectiveness of the proposed approach has been demonstrated through a comparison with the available results in the crisp case.</p>","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":"141782897","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}