Engineering Geology最新文献

{"title":"Insights from tensile fracture properties and full-field strain evolution of deep coral reef limestone under dynamic loads","authors":"Kai Wu ,&nbsp;Qingshan Meng ,&nbsp;Hongya Li ,&nbsp;Jiajun Deng ,&nbsp;Haifeng Liu ,&nbsp;Chi Wang ,&nbsp;Le Luo ,&nbsp;Tianli Shen","doi":"10.1016/j.enggeo.2024.107738","DOIUrl":"10.1016/j.enggeo.2024.107738","url":null,"abstract":"<div><div>Coral reef limestone (CRL) commonly undergoes dynamic tension when underground structures of island reefs encounter impacts, explosions, or seismic activities. Given the complexity of biological pores, the dynamic tensile fracture characteristics of CRL are poorly understood. Therefore, the dynamic tensile fracture behaviors of deep CRL were systematically observed by Split Hopkinson Pressure Bar tests and digital image techniques. Comparing to traditional rocks, the macro-pores near failure band would significantly change cracking path. The failure patterns are dominated by loading rate. The strongly dependence of dynamic tensile strength and dynamic crack initiation toughness on loading rate suggests the two indices overcome the effect of CRL macro-pores under dynamic impacts. At low loading rates, tensile fractures predominantly follow intergranular cracks, whereas transgranular cracks dominate at higher rates. The fractal dimension of fracture surface decreases with increasing crack propagation velocity, loading rate, and dynamic crack initiation toughness. Due to the unique marine sedimentary environment, the mechanical heterogeneity in multiple scales distinguishes CRL from terrestrial rock materials. The insights into underlying mechanisms of dynamic tension provide support to optimization of blasting scheme and stability assessments for island underground engineering.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"341 ","pages":"Article 107738"},"PeriodicalIF":6.9,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142358063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study on the influence of rock pore structure on pressure stimulated voltage variations based on nuclear magnetic resonance","authors":"Shan He ,&nbsp;Min Li ,&nbsp;Shiliang Shi ,&nbsp;Yi Lu ,&nbsp;Deming Wang","doi":"10.1016/j.enggeo.2024.107736","DOIUrl":"10.1016/j.enggeo.2024.107736","url":null,"abstract":"<div><div>Since rocks will generate voltage under load, studying their voltage characteristics is of prime importance for the prevention and control of mine dynamic disasters and the corresponding secondary disasters. In this study, a pressure stimulated voltage (PSV) test system for rock materials under uniaxial compression was constructed to explore the law of PSV variations of rocks. Meanwhile, a nuclear magnetic resonance test system was employed for investigating the influence mechanism of pore structure changes on PSV variations. The following beneficial results were obtained. A “double-peak” phenomenon is observed on the PSV curves of granite and sandstone, whereas, for marble, the phenomenon only appears under high loading rates. The <em>T</em>₂ spectra of different types of rock differ greatly. After granite fractures under load, some primary micro-pores are converted into meso-pores and macro-pores, accompanied by the generation of substantial new micro-pores. These micro-pores activate more rock defects (dislocation and grain boundary), resulting in a higher average PSV and peak PSV. After marble fractures, numerous primary micro-pores are transformed into meso-pores and macro-pores, and the proportion of new micro-pores falls. Consequently, its electricity generation capacity weakens. In contrast, sandstone contains a higher proportion of micro-pores. After it fractures, despite the conversion of some micro-pores into meso-pores and macro-pores, abundant micro-pores are generated again, bringing about a relatively high voltage. In short, the changes in overall porosity cannot represent the electricity generation capacity of rock, and the changes in bound cracks exert a profoundly influence on it. The key to the electricity generation capacity of rock lies in the increase and connection of micro-cracks.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"341 ","pages":"Article 107736"},"PeriodicalIF":6.9,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142314321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Predicting cyclic liquefaction behavior of saturated granular materials using an updated state evolution model","authors":"Lihong Tong ,&nbsp;Li Fu ,&nbsp;Haibin Ding ,&nbsp;Changjie Xu ,&nbsp;C.W. Lim","doi":"10.1016/j.enggeo.2024.107731","DOIUrl":"10.1016/j.enggeo.2024.107731","url":null,"abstract":"<div><div>Liquefaction and dynamic response of granular materials under dynamic loading has been studied intensively in field and laboratory tests. However, theoretical modeling and analytical solutions on liquefaction are still lagging and investigations are mostly restricted to laboratory observations. To investigate undrained liquefaction shear deformation and fluidity of granular material, the updated state evolution model is proposed by introducing an excess pore water pressure ratio parameter. A series of undrained cyclic triaxial tests and DEM simulations are conducted to verify the proposed model. The result indicates that the liquefaction behavior of granular materials can be captured by the updated state evolution model both at constant and varying loading frequency. Furthermore, the state parameter based on the deviatoric strain and excess pore water pressure ratio is determined to quantify assess the fluidity of granular materials. It facilitates the refinement of the discriminative criteria for cyclic liquefaction of granular materials. This parameter increases slowly at the beginning of loading, followed by a rapid and fluctuating rise, and reaches the peak before the initial liquefaction. Another significant finding is that the turning point of the state parameter range from 0.89 to 0.95 in the <span><math><mi>θ</mi><mo>−</mo><mi>t</mi><mo>/</mo><msub><mi>t</mi><mn>0</mn></msub></math></span> plane and between 0.84 and 0.94 in the <span><math><mi>θ</mi><mo>−</mo><msub><mi>r</mi><mi>u</mi></msub></math></span> plane, as affected by the cyclic loading conditions.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"342 ","pages":"Article 107731"},"PeriodicalIF":6.9,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142438109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fatigue mechanical properties and Kaiser effect characteristics of the saturated weakly cemented sandstone under different loading rate conditions","authors":"Kui Zhao ,&nbsp;Youbing Liu ,&nbsp;Daoxue Yang ,&nbsp;Bo Li ,&nbsp;Zhen Huang ,&nbsp;Chongjie Huang ,&nbsp;Botan Shen ,&nbsp;Xiongdong Lan","doi":"10.1016/j.enggeo.2024.107732","DOIUrl":"10.1016/j.enggeo.2024.107732","url":null,"abstract":"<div><div>Weakly cemented sandstone (WCS) is a unique rock type widely distributed on the surface. Environmental factors such as groundwater and stress variations easily influence its fatigue mechanical properties and fracture characteristics. To design and evaluate the long-term stability of surrounding rock support in tunnel excavation and underground resource mining projects, investigating the fatigue mechanical properties and acoustic emission (AE) response characteristics of saturated WCS under different loading rates is of great practical and theoretical significance. This study employed experimental techniques such as X-ray diffraction (XRD), nuclear magnetic resonance (NMR), and natural water absorption tests to investigate the mineral composition, pore size, and connectivity characteristics of WCS. The multi-level cyclic loading-unloading tests (MCLU) combined with the AE system were conducted on dry and saturated WCS specimens at different loading rates. The results reveal that the deformation modulus of these specimens initially increases and then decreases under cyclic loading conditions. Water significantly influences the fatigue strength and deformation resistance of sandstone. As the loading rate increases, the range of RA values broadens, accompanied by a marked increase in the number of AE signals with high RA values. Saturated sandstone specimens are more prone to developing macroscopic shear fracture surfaces. Water has a more substantial effect on the stress distribution ranges corresponding to the response of the Kaiser effect in WCS than loading rates. The capacity of the Kaiser effect to indicate the extent of rock damage is intricately linked to the progression of internal micro-cracks. When internal damage surpasses the critical value of the Kaiser effect memory damage, the accelerated propagation of shear cracks becomes pivotal in the internal damage of the sandstone. It seems that the presence of water within the interior of the rock may facilitate the dissolution of K-feldspar in WCS, which could result in the formation of kaolinite, which will be further transformed into illite. The hydration expansion of illite may further exacerbate the deterioration effect of the mechanical properties of WCS.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"341 ","pages":"Article 107732"},"PeriodicalIF":6.9,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142321943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Swelling creep diagenesis damage model for the Callovo-Oxfordian claystone","authors":"Jean-Claude Robinet ,&nbsp;Asterios Valogiannis ,&nbsp;Irini Djeran-Maigre","doi":"10.1016/j.enggeo.2024.107729","DOIUrl":"10.1016/j.enggeo.2024.107729","url":null,"abstract":"<div><div>The French National Agency for Radioactive Waste Management (ANDRA) has been constructing an Underground Research Laboratory (URL) in Meuse/Haute-Marne since 2000 to determine the viability and protection of deep geological formation for hosting industrial nuclear waste repositories. The purpose of this URL is to describe the in situ properties and behavior of the Callovo-Oxfordian (COx) claystone. At the same time, various types of computational models have been developed to reproduce the in situ phenomena.</div><div>This paper presents an elastoviscoplastic model called SC2D: Swelling, Creep, Diagenesis, with anisotropic Damage, taking into account in situ measurements. This phenomenological model was developed to contribute to the understanding of the short- and long-term behavior of the COx claystone around the excavated drift. The model parameters are calibrated using in situ measurements and observations.</div><div>The model assumes that intact COx claystone (around from the excavated drift) exhibits elastic behavior with anisotropic damage in extension as macropores are occupied by calcite fibers. The short-term behavior of damaged COx claystone (near the excavated drift) is also characterized by an elastic mechanism with anisotropic damage. Sampling causes hydromechanical unloading that breaks the calcite fibers. Upon reloading the sample to site mean pressure, the damaged COx claystone first presents elastic behavior and then elastoplastic behavior depending on the load surface. Triaxial tests in axial compression and axial extension are conducted to validate this model with satisfactory results. Its long-term behavior follows an elastoviscoplastic mechanism.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"341 ","pages":"Article 107729"},"PeriodicalIF":6.9,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of bedding on fracture toughness and failure patterns of anisotropic shale","authors":"Yanyan Li,&nbsp;Yifeng Hu,&nbsp;Hong Zheng","doi":"10.1016/j.enggeo.2024.107730","DOIUrl":"10.1016/j.enggeo.2024.107730","url":null,"abstract":"<div><div>The initiation and propagation of hydraulic fractures are closely related to the fracture ability of rocks. Such processes in shale reservoirs are, to a certain extent, controlled by bedding. However, the control mechanism of bedding on the anisotropy of fracture toughness and fracturing behavior remains unclear. In this study, a series of numerical notched semi-circular bend (NSCB) tests are conducted using the discrete element method (DEM) to investigate the influence of bedding properties on the anisotropy of fracture toughness and fracture patterns. Based on the DEM framework, a novel simulation method is proposed to accurately identify two key fracture indicators, the fracture process zone (FPZ) and crack tip opening displacement (CTOD), to reveal the fracture driving mechanism. The results show that the fracture toughness of shale is negatively correlated with bedding angles <em>β</em> but positively correlated with bedding spacing and bedding strength. Both the bedding strength and spacing significantly influence the fracture pattern of the specimens with <em>β</em> = 0°–60°, whereas the specimen with <em>β</em> = 90° is scarcely affected by the bedding planes. The evolution of the CTOD and FPZ in shale exhibits distinct phased characteristics. Due to the strong suppression effect of low-angle bedding planes on pre-peak crack deflection, the CTOD and FPZ exhibit opposite trends with respect to bedding angles before and after the peak load. This study facilitates the understanding of the fracture propagation process of anisotropic shale and could provide guidance for hydraulic fracturing design in shale reservoirs.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"341 ","pages":"Article 107730"},"PeriodicalIF":6.9,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Permeability characteristics, structural failure characteristics, and triggering process of loess landslides in two typical strata structures","authors":"Zekun Li ,&nbsp;Penghui Ma ,&nbsp;Jianqi Zhuang ,&nbsp;Qingyi Mu ,&nbsp;Jiaxu Kong ,&nbsp;Luqing Zhao ,&nbsp;Jianbing Peng","doi":"10.1016/j.enggeo.2024.107728","DOIUrl":"10.1016/j.enggeo.2024.107728","url":null,"abstract":"<div><div>Landslides occurring at the interface of strata are among the most common forms of loess landslides in China. Statistics indicate that significant loess-red silty clay interface landslides induced by irrigation in the Heifangtai Platform than loess-paleosol interface landslides in the South Jingyang Platform. To uncover the permeability characteristics, structural failure patterns, and triggering processes of two typical strata structures. This study employs Nuclear Magnetic Resonance (NMR) and Scanning Electron Microscopy (SEM) techniques to investigate the permeability and structural failure of two soil combination types: loess-red silty clay and loess-paleosol. The results revealed a positive correlation between the stagnant water effect and flow rate, but a negative correlation with the initial water content. Notably, these two typical strata exhibited distinct differences in the stagnant water effect. In loess-red silty clay, continuous filling of mesopores and macropores by fine clay particles, while at the same time the agglomerates disintegration at the interface, thereby enhancing the stagnant water effect. In contrast, loess-paleosol exhibited good connectivity between the mosaic pores at the interface. This facilitated the formation of several elongated microcracks, which acted as dominant channels for infiltration and weakened the stagnant water effect. However, the macroscopic triggering mechanism for loess landslides in both loess-red silty clay and loess-paleosol combination strata remains similar. Irrigation water stagnates within the relatively impermeable layers, saturating and structurally damaging the bottom of loess layer, ultimately inducing landslides. These findings provide a scientific basis for the future study of loess landslide hazards in different strata structures, which is of great significance.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"341 ","pages":"Article 107728"},"PeriodicalIF":6.9,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advanced multi-scale characterization of loess microstructure: Integrating μXCT and FIB-SEM for detailed fabric analysis and geotechnical implications","authors":"B. Yu ,&nbsp;T.A. Dijkstra ,&nbsp;W. Fan ,&nbsp;I.J. Smalley ,&nbsp;Y.N. Wei ,&nbsp;L.S. Deng","doi":"10.1016/j.enggeo.2024.107727","DOIUrl":"10.1016/j.enggeo.2024.107727","url":null,"abstract":"<div><p>Loess, a Quaternary wind-blown deposit, is a problem soil that gives rise to frequent geohazards such as landslides and water-induced subsidence. The behaviour of loess is controlled by its microstructure, consisting of silt-sized skeleton particles and complex bonding structures formed by clay-sized particles. Achieving a deep understanding and precise modelling of loess behaviour necessitates comprehensive knowledge of the realistic 3D microstructure. In this paper, a correlative investigation of the 3D loess microstructure is performed using X-ray micro-computed tomography (μXCT) and focused ion beam scanning electron microscope (FIB-SEM). Details of clay structures in loess, such as clay coatings, clay bridges and clay buttresses, are visualized and characterized in 3D based on FIB-SEM images with a voxel size of 10 × 10 × 10 nm³. The clay structures exhibit a diverse degree of complexity and their impact on the mechanical properties of loess is highlighted. Statistical analysis of the skeleton particles, including size, shape and orientation, are derived from μXCT images with a voxel size of 0.7 × 0.7 × 0.7 μm³. The findings provide insights into the collapse mechanism and particle-scale modelling of loess. The combination of μXCT and FIB-SEM proves to be a powerful approach for characterizing the intricate micro-structures of loess, as well as other geomaterials.</p></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"341 ","pages":"Article 107727"},"PeriodicalIF":6.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142270900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Undrained triaxial compression tests on normally consolidated bentonite considering temperature/confining pressure dependency","authors":"Peng Peng ,&nbsp;Xiaohua Bao ,&nbsp;Keigo Takagi ,&nbsp;Ryuhei Urata ,&nbsp;Yonglin Xiong ,&nbsp;Feng Zhang","doi":"10.1016/j.enggeo.2024.107726","DOIUrl":"10.1016/j.enggeo.2024.107726","url":null,"abstract":"<div><div>In the geological repository of high-level radioactive wastes (HLRW), one of the most important issues is the stability of artificial barrier basically using bentonite. However, due to the exist gaps between bentonite block and surround rock mass, the bentonite can swell relatively freely, whose constraining condition is quite different from the normal swelling pressure test. As an extreme case, the bentonite may engage completely into the surrounding ground and become a complete normal consolidated state. Therefore, in order to investigate the thermo-mechanical behavior of saturated bentonite at normally consolidated state, a newly proposed static compaction method for preparing specimen of saturated normally consolidated bentonite was proposed first. Then, a series of undrained triaxial compression tests were conducted under different confining pressure and temperature, by which the thermo-mechanical behavior of bentonite, used as an artificial barrier of geological repository of HLRW, is investigated systematically. The tests results reveal that the specimen prepared by the proposed method is confirmed to have sufficient saturation (&gt; 0.92), meanwhile the prepared specimen is at slightly overconsolidated state that roughly equal to a K0-line consolidation. The deformation of the bentonite in undrained triaxial compression tests changes from plastic to brittle as the temperature increases. Simulation based on a sophisticated constitutive model considering water compressibility at high confining pressure was also discussed. The results are useful for assessing the mechanical behavior of bentonite after hundreds years of geological repository of HLRW.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"341 ","pages":"Article 107726"},"PeriodicalIF":6.9,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydromechanics based prediction of suffusion development in spatially random soil structures","authors":"Zhe Huang,&nbsp;Haijue Xu,&nbsp;Yuchuan Bai,&nbsp;Baolong Zhang,&nbsp;Jie Liu","doi":"10.1016/j.enggeo.2024.107725","DOIUrl":"10.1016/j.enggeo.2024.107725","url":null,"abstract":"<div><p>As a typical mechanism of internal erosion, suffusion has led to geological disasters in engineering structures worldwide. A slight deviation in soil structures, also known as the spatial randomness of soil parameters, determines the significant differences in this erosion process. However, owing to the lack of absolute quantitative prediction models for suffusion, this issue has not been effectively evaluated. This paper introduces initial random fields of soil properties into a hydromechanical model to quantitatively predict the possibility of suffusion, considering the random deviations in soil gradation, porosity, and permeability. Through the prediction of 50 sets of random fields, certain trends and uncertain deviations of suffusion are discovered. This certainty and uncertainty constitute the possible range of suffusion, which surrounds the prediction of the homogeneous model and will be temporally widened to larger deviations, indicating the unpredictability of the later stage of suffusion. Statistical analysis revealed that soils with more compacted porosity, more movable particles and less permeability at the seepage outlet are prone to suffusion, and this advantage gradually increases to form the upper envelope of the possible range. This phenomenon is attributed to the larger additional forces acting on the movable particles and the abundant movable particles. The hydromechanics-based model of random soil structures can theoretically estimate the possible development of suffusion and effectively assess the uncertainty of internal erosion risk in hydraulic engineering.</p></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"341 ","pages":"Article 107725"},"PeriodicalIF":6.9,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142270901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}