International Journal for Numerical and Analytical Methods in Geomechanics最新文献

Numerical Investigation of Mechanical Response of Sand‐Rubber Mixture by Material Point Method 砂-橡胶混合料力学响应的物质点法数值研究

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-05-31 DOI: 10.1002/nag.4011

Qibo Shi, Weijian Liang, Yin‐Fu Jin, Zhen‐Yu Yin, Xiangsheng Chen

{"title":"Numerical Investigation of Mechanical Response of Sand‐Rubber Mixture by Material Point Method","authors":"Qibo Shi, Weijian Liang, Yin‐Fu Jin, Zhen‐Yu Yin, Xiangsheng Chen","doi":"10.1002/nag.4011","DOIUrl":"https://doi.org/10.1002/nag.4011","url":null,"abstract":"Sand‐rubber mixture (SRM), a composite material made of recycled rubber and sand, is gaining increasing attention in construction engineering due to its lightweight nature, cost‐effectiveness, ease of processing, and other advantages. However, the mechanical behavior of SRM remains a complex issue as the addition of rubber not only increases the types of contacts between grains, but also changes the contact topology with rubber undergoing significant deformation. This study presents a numerical investigation of the intricate mechanical behavior of SRM based on the material point method (MPM) tailored for modeling the assembly of deformable grains. The employed approach introduces multiple meshes for handling the kinetic and deformation of individual grains and a discrete element method (DEM)‐type contact algorithm to directly address the intricate interaction in SRM, being capable of accurately modeling the complex behavior of SRM. Furthermore, rubber membranes in the biaxial shear test are simulated with material points with sufficient deformation capacity to accurately simulate the actual loading boundary. We first validated the accuracy and effectiveness of the proposed method through a series of benchmarks. Subsequently, one‐dimensional compression and biaxial shear simulations were conducted on the SRM to investigate the influence of rubber content (RC) and confining pressures. Both macroscopic deformation and the microstructural characteristics are examined. The results indicate that increasing RC leads to a more uniform contact force distribution, and a more stable force chain network, while higher confining pressure enhances the particle connectivity within the SRM.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"44 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144188859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring the Elastic Properties of Interfacial Transition Zone in Concrete Materials Using an Ensemble Learning Approach 用集成学习方法探索混凝土材料界面过渡区的弹性特性

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-05-30 DOI: 10.1002/nag.4009

Jing Xue, Yajun Cao, Xiaolong Zhao, Jianfu Shao

引用次数: 0

Compacting Effect Study on the Treatment of Collapsible Loess Foundation by the SDDC Method: Numerical and Experimental Analysis SDDC法处理湿陷性黄土地基的压实效果研究：数值与试验分析

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-05-27 DOI: 10.1002/nag.4002

Caihui Zhu, Sen Peng, Xiaosong Zhou, Xiulai Zhu, Jianwei Qiao, Lei Yan, Xinlei Li, Wei Shi

{"title":"Compacting Effect Study on the Treatment of Collapsible Loess Foundation by the SDDC Method: Numerical and Experimental Analysis","authors":"Caihui Zhu, Sen Peng, Xiaosong Zhou, Xiulai Zhu, Jianwei Qiao, Lei Yan, Xinlei Li, Wei Shi","doi":"10.1002/nag.4002","DOIUrl":"https://doi.org/10.1002/nag.4002","url":null,"abstract":"An optimal design scheme is developed for treating collapsible loess foundation by the super down‐hole dynamic compaction method (SDDC) in terms of the loess foundation treatment project. This method involves the application of high‐energy impacts to the soil to achieve a compacting effect (CE), which is defined as the measurable improvement in soil density and reduction in its collapsibility. The compaction effect of loess particles and different SDDC parameters on collapsible loess foundation is simulated by the discrete element method (DEM) based on particle flow PFC software, and the optimization scheme is verified by field test data. The results indicates that the SDDC method is more effective for the foundation with uniform soil particle distribution with fine particle size, while the influence of initial porosity, shear modulus, and Poisson's ratio of soil on foundation CE is not significant. For a single pile, the CE of the foundation can be improved by increasing the compaction energy and the diameter of the hammer head, increasing the compaction energy, and reducing the diameter of the drill hole and the distance between piles. The CE performance of an olivary hammer is better than a pointed hammer. Finally, the design parameters of the SDDC construction method in this site are determined as follows: The down‐hole diameter D0 = 1.2 m, pile spacing L = 2.8–3.2 m, and olivary hammer construction was adopted.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"10 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144153378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Revisiting Undrained Cavity Expansion in Mohr–Coulomb Soils: Consideration of Limited Dilation 莫尔-库仑土不排水孔洞扩展研究：有限膨胀的考虑

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-05-27 DOI: 10.1002/nag.4003

He Yang, Xu Wang, Shengli Chen, Pei‐Zhi Zhuang, Hai‐Sui Yu

{"title":"Revisiting Undrained Cavity Expansion in Mohr–Coulomb Soils: Consideration of Limited Dilation","authors":"He Yang, Xu Wang, Shengli Chen, Pei‐Zhi Zhuang, Hai‐Sui Yu","doi":"10.1002/nag.4003","DOIUrl":"https://doi.org/10.1002/nag.4003","url":null,"abstract":"The effective stresses are found to continually increase for undrained cavity expansion in Mohr–Coulomb soils with unlimited dilation. This paper revisits this problem and presents a new solution with further consideration of limited soil dilation. The soil is modelled as a non‐associated Mohr–Coulomb model, and the limited dilation is controlled by the limited plastic volumetric strain, beyond which the soil dilation angle drops to zero. Both the auxiliary variable approach and total strain approach are leveraged for solution derivation, as the former helps to give more concise solutions while the latter is more efficient in calculating the stresses and deformation at a given time. A series of parametric studies is conducted based on the new solution, with highlighting on the influence of limited soil dilation. When dilation ceases for soils with limited dilation, it is found that the effective stresses remain steady instantly rather than keep increasing, and the excess water pressure and total inner cavity pressure gradually increase to steady states. The limit cavity pressure will be heavily overestimated if the limited soil dilation is neglected.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"133 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144153381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Novel Three‐Dimensional Analytical Model for the Thermomechanical Responses of Energy Piles and the Surrounding Soil Based on Thermoelastic Theory 基于热弹性理论的能量桩及其周围土体热力学响应三维解析模型

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-05-27 DOI: 10.1002/nag.4010

Lei Huang, Zhaowei Ding, Chunyu Song

{"title":"A Novel Three‐Dimensional Analytical Model for the Thermomechanical Responses of Energy Piles and the Surrounding Soil Based on Thermoelastic Theory","authors":"Lei Huang, Zhaowei Ding, Chunyu Song","doi":"10.1002/nag.4010","DOIUrl":"https://doi.org/10.1002/nag.4010","url":null,"abstract":"Owing to their dual role in utilizing geothermal energy and supporting structural loads, energy piles are affected by thermomechanical loads. Moreover, the heating/cooling of energy piles also causes non‐negligible thermal stresses in the soil around the piles. The load transfer method is commonly used to address the thermomechanical response of energy piles. However, this method has problems such as slow convergence speed, difficulty in determining parameters and neglect of the soil coupling effect. Additionally, the method is unable to be used for analysing the thermal stress and strain of the soil around the piles. To overcome the limitations of the load transfer method, in this paper, a novel three‐dimensional analytical model based on thermoelastic theory that couples the thermomechanical coupling effect between energy piles and soil is proposed. The governing equations are derived in axisymmetric coordinates, and solutions to the heat diffusion equation are applied. The Helmholtz equation is solved with undetermined coefficients determined by boundary conditions via separation of variables and recurrence relations of modified Bessel functions. By comparing the results with those of field and centrifuge tests, the solution's validity is verified. Unlike discrete load transfer methods, the continuum mechanics‐based framework eliminates iterative convergence issues and quantitatively evaluates soil thermal stress and displacement. The proposed model provides a theoretical tool for refined energy pile design under mixed geological and thermal boundary conditions, advancing multiphysical field coupling analysis for geothermal structures.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"0 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144153380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Three‐Dimensional Solution for the Semi‐Coupled Thermo‐Mechanical and Thermo‐Hydro‐Mechanical Behaviors of Soils With Groundwater 含地下水土壤热-力学和热-水-力学半耦合特性的三维解

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-05-27 DOI: 10.1002/nag.3996

Zhenming Shi, Qing Wang, Yong Zhi Zhao, Chengzhi Xia, Shaoqiang Meng

{"title":"A Three‐Dimensional Solution for the Semi‐Coupled Thermo‐Mechanical and Thermo‐Hydro‐Mechanical Behaviors of Soils With Groundwater","authors":"Zhenming Shi, Qing Wang, Yong Zhi Zhao, Chengzhi Xia, Shaoqiang Meng","doi":"10.1002/nag.3996","DOIUrl":"https://doi.org/10.1002/nag.3996","url":null,"abstract":"This study proposes a three‐dimensional transformed differential quadrature solution for the thermo‐mechanical (TM) and thermo‐hydro‐mechanical (THM) coupling of transversely isotropic soils considering groundwater. Initially, the governing equations for TH coupling above the water table and THM coupling below the water table are introduced. Subsequently, two‐dimensional Fourier integral transform and Laplace integral transform are applied, and a series of equations are discretized along the depth according to the discrete rules of the transformed differential quadrature method. Then, the boundary conditions for stress, displacement, and temperature are introduced through integral transforms and stress‐strain relationships. By solving the matrix equation, the solution for transversely isotropic soils is obtained. After verifying the theory in this study, continuity conditions, the water table depth, anisotropy of thermal diffusion coefficients, and seepage are analyzed, contributing to the design of radioactive waste disposal sites, energy piles, and other projects.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"16 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144153382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Limitations of a Standard Phase‐Field Model in Reproducing Jointing in Sedimentary Rock Layers 标准相场模型在再现沉积岩节理中的局限性

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-05-23 DOI: 10.1002/nag.4006

Edoardo Pezzulli, Patrick Zulian, Alena Kopaničáková, Rolf Krause, Thomas Driesner

{"title":"The Limitations of a Standard Phase‐Field Model in Reproducing Jointing in Sedimentary Rock Layers","authors":"Edoardo Pezzulli, Patrick Zulian, Alena Kopaničáková, Rolf Krause, Thomas Driesner","doi":"10.1002/nag.4006","DOIUrl":"https://doi.org/10.1002/nag.4006","url":null,"abstract":"Geological applications of phase‐field methods for fracture are notably scarce. This work conducts a numerical examination of the applicability of standard phase‐field models in reproducing jointing within sedimentary layers. We explore how the volumetric‐deviatoric split alongside the AT1 and AT2 phase‐field formulations has several advantages in simulating jointing, but also has intrinsic limitations that prevent a reliable quantitative analysis of rock fracture. The formulations qualitatively reproduce the process of joint saturation, along with the negative correlation between joint spacing and the height of the sedimentary layer. However, in quantitative comparison to alternative numerical methods and outcrop observations, the phase‐field method overestimates joint spacings by a factor of 2 and induces unrealistic compressive fractures in the AT1 model, alongside premature shearing at layer interfaces for the AT2 model. The causes are identified to be intrinsic to the phase‐field lengthscale and the unsuitable strength envelope arising from the Volumetric‐Deviatoric split. Finally, our analysis elucidates the phase‐field lengthscale's distortion of the stress field around dilating fractures, causing the sedimentary layer to reach joint saturation prematurely, thereby stopping the nucleation of new fractures and leading to larger joint spacings than in natural examples. Decreasing the lengthscale results in gradual improvement but becomes prohibitively computationally expensive for very small lengthscales such that the limit of ‘natural’ behaviour was not reached in this study. Overall, our results motivate the development of constitutive phase‐field models that are more suitable for geological applications and their benchmarking against geological observations.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"137 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144122488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","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 on the Thermo‐Hydro‐Mechanical Behavior of Energy Micropiles in Hypoplastic Soft Clay Under Cyclic Thermal Loading 循环热荷载作用下低塑性软粘土中能量微桩热-水-力学行为的数值研究

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-05-23 DOI: 10.1002/nag.4007

Giovanni Ciardi, Claudio Tamagnini

{"title":"Numerical Study on the Thermo‐Hydro‐Mechanical Behavior of Energy Micropiles in Hypoplastic Soft Clay Under Cyclic Thermal Loading","authors":"Giovanni Ciardi, Claudio Tamagnini","doi":"10.1002/nag.4007","DOIUrl":"https://doi.org/10.1002/nag.4007","url":null,"abstract":"Coupled nonlinear thermo‐hydro‐mechanical finite element simulations were carried out to investigate the behavior of energy micropiles subjected to thermal loading cycles. Two kinds of problems were analyzed: The case of an isolated micropile, for which comparison with previous research on medium‐size isolated energy pile is provided, and the case of large groups of micropiles, with the aim of investigating the interaction effects. In both problems, micropiles were considered installed in a thick layer of very soft, saturated clay, characterized by isotropic or anisotropic hydraulic conductivity. Two advanced existing hypoplastic models, one incorporating the thermal softening feature, were used to describe the clay behavior in both problems. The settlements of the micropile head were found to increase during thermal cycles under constant mechanical load, showing a sort of ratcheting. For micropile groups, the settlement increase rate was faster as the spacing between micropiles was reduced. The excess pore water pressures developed at the micropile‐soil interface played a significant role on the deformation and displacement fields of the soil‐micropile systems, especially in the case of micropile groups, affecting the shear strength developed at the micropile‐soil interface. The consolidation process was faster when the hydraulic conductivity was anisotropic, meaning that the development of excess pore water pressure was reduced in this case. As the spacing between the micropiles increased, i.e., as thermal interaction decreased, the heat flux exchanged by a micropile of the group during one cycle approached the heat flux exchanged by an isolated micropile in the same period.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"31 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144130306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Closed‐Form Solutions of Translatory Coal Seam Bumps Considering the Intermediate Principal Stress and Gas Pressure 考虑中间主应力和瓦斯压力的平移煤层凸起闭合解

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-05-23 DOI: 10.1002/nag.4004

Changguang Zhang, Mohan Shi, Sirui Wang, Hongfei Cao, Tianbin Li

{"title":"Closed‐Form Solutions of Translatory Coal Seam Bumps Considering the Intermediate Principal Stress and Gas Pressure","authors":"Changguang Zhang, Mohan Shi, Sirui Wang, Hongfei Cao, Tianbin Li","doi":"10.1002/nag.4004","DOIUrl":"https://doi.org/10.1002/nag.4004","url":null,"abstract":"Translatory bumps are becoming a major challenge in the excavation of coal seams. This study presents closed‐form solutions of stress and plastic zone width for translatory coal seam bumps within the framework of the Lippmann theory. The strength of coal seam taken as an elastic−perfectly plastic material and the friction force at the coal−rock interface are evaluated by the generalized effective stress with consideration of gas pressure. The Unified Strength Theory is adopted to address the contributions of intermediate principal stress on the strength improvements of the coal seam. The orderly serialized solution obtained in this study is formatted into three sets in accordance with linear, exponential, and sinusoidal profiles of gas pressure, and its validity is demonstrated by comparing it with both published theoretical solutions and numerical simulations. In addition, discussions are conducted between the results from three profiles of gas pressure and varying influencing extents of intermediate principal stress. Parametric studies highlight that the effect of gas pressure is significant, especially for the exponential profile with a weaker effect of intermediate principal stress; the translatory bump tendency is high for the coal seam with great depth and thin thickness; the internal friction angle of coal seam has a more pronounced impact than the cohesion of coal seam.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"44 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144122487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bidirectional Conformal Mapping for Over‐Break and Under‐Break Tunnelling and Its Application in Complex Variable Method 过破和欠破隧道的双向保角映射及其在复变法中的应用

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-05-21 DOI: 10.1002/nag.4008

Luo‐bin Lin, Fu‐quan Chen, Chang‐jie Zheng, Shang‐shun Lin

{"title":"Bidirectional Conformal Mapping for Over‐Break and Under‐Break Tunnelling and Its Application in Complex Variable Method","authors":"Luo‐bin Lin, Fu‐quan Chen, Chang‐jie Zheng, Shang‐shun Lin","doi":"10.1002/nag.4008","DOIUrl":"https://doi.org/10.1002/nag.4008","url":null,"abstract":"Over‐break and under‐break excavation is very common in practical tunnel engineering with asymmetrical cavity contour, while existing conformal mapping schemes of complex variable method generally focus on tunnelling with theoretical and symmetrical cavity contour. Besides, the solution strategies of existing conformal mapping schemes for non‐circular tunnel generally apply optimization theory and are thereby mathematically complicated. This paper proposes a new bidirectional conformal mapping for over‐break and under‐break tunnels of asymmetrical contours by incorporating Charge Simulation Method, which only involves a pair of forward and backward linear systems, and is therefore logically straightforward, computationally efficient and practically easy in coding. New numerical strategies are developed to deal with possible sharp corners of cavity by small arc simulation and densified collocation points. Several numerical examples are presented to illustrate the geometrical usage of the new bidirectional conformal mapping. Furthermore, the new bidirectional conformal mapping is embedded into two complex variable solutions of under‐break shallow tunnelling in gravitational geomaterial with reasonable far‐field displacement. The respective result comparisons with finite element solution and existing analytical solution show good agreements, indicating that the new bidirectional conformal mapping would extend the mechanical application range of the complex variable method in practical over‐break and under‐break tunnelling.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"19 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144113680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0