Engineering Geology最新文献

{"title":"An improved rock damage model from a cyclic temperature – triaxial loading experiment for compressed air energy storage caverns","authors":"Zhongyu Yu ,&nbsp;Shiwei Shen ,&nbsp;Miao Li ,&nbsp;Min Zhang ,&nbsp;Lupeng Tian ,&nbsp;Guowen Hua","doi":"10.1016/j.enggeo.2024.107857","DOIUrl":"10.1016/j.enggeo.2024.107857","url":null,"abstract":"<div><div>While studies on rock damage have mostly examined cyclic mechanical loading, or addressed thermal and mechanical loadings separately, compressed air energy storage (CAES) projects require the coupling of both effects. Granite was used to demonstrate a systematic experimental procedure in which cyclic temperature effects was incorporated into fatigue damage study of rocks subject to cyclic mechanical loading. Granite specimens were pre-treated with cyclic temperatures up to 200 °C, 400 °C, and 600 °C, with the P-wave velocity tested after each cycle. Subsequently, the treated specimens went through triaxial cyclic loading. The upper limit of the triaxial cyclic loading was 200 MPa, and the confining pressures were 5 MPa, 10 MPa, and 15 MPa. Granite exhibited hardened and weakened behaviour. The specimens were weakened if the deviatoric stress exceeded the fatigue threshold, which was determined by the cyclic temperature and the confining pressure in this study. A damage model was derived to quantify the degree of hardening and weakening. The model improved the existing damage models by incorporating the cyclic temperature effect. This study lays a foundation for safe operation of CAES projects.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"344 ","pages":"Article 107857"},"PeriodicalIF":6.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Decoding microstructural evolution and mechanical degradation of micaceous granite residual soils as marginal geomaterials in tropical climates","authors":"Haodong Gao ,&nbsp;Xianwei Zhang ,&nbsp;Ran An ,&nbsp;Gang Wang ,&nbsp;Xinyu Liu ,&nbsp;Huicheng Fu","doi":"10.1016/j.enggeo.2024.107899","DOIUrl":"10.1016/j.enggeo.2024.107899","url":null,"abstract":"<div><div>Micaceous residual soil (MRS), a marginal geomaterial commonly found in tropical regions, is often used in low-grade construction projects due to budget constraints. However, little is currently known about its geotechnical properties, especially its long-term environmental response and microstructural variations. Investigated here is how mica content and climate-induced wetting–drying (WD) cycles affect the physical and mechanical properties of MRS. Reconstituted MRS samples with varying mica contents were prepared by mixing muscovite powder with plain residual soil, from which the original mica was removed. These samples were subjected to WD cycles to simulate tropical climate conditions. Geotechnical properties and microstructural changes were analyzed through systematic experimental tests and microscopic observations. The degradation observed during the WD cycles included crack propagation, volumetric swelling, reduced strength, and increased disintegration, all of which were positively correlated with mica content. Notably, for MRS with high mica content, the WD cycles ameliorated the soil brittleness, altering previous perceptions of uniformly low performance for MRS. The effect of mica on MRS under long-term environmental changes is attributed to both the inherent properties of mica and the particle packing structure in the soil. This study enhances the understanding of MRS behavior in tropical climate and provides technical recommendations for further improvement and effective application of this marginal geomaterial.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"346 ","pages":"Article 107899"},"PeriodicalIF":6.9,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929280","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":"Impact of subgrade cross-sectional forms on the thermo-mechanical stability of high-speed railway subgrades in cold regions","authors":"Chunqing Ma ,&nbsp;Bowen Tai ,&nbsp;Zurun Yue","doi":"10.1016/j.enggeo.2024.107898","DOIUrl":"10.1016/j.enggeo.2024.107898","url":null,"abstract":"<div><div>This study investigates the impact of subgrade cross-section configurations on the thermal-hydraulic-mechanical stability of anti-frost heave subgrade structures, essential for the safe operation of high-speed railways in cold regions. Focusing on the Mudanjiang-Jiamusi high-speed railway in China's deep seasonal frozen soil region, we analyzed typical subgrade cross-sections using a combination of field measurements and field-based analyses. The objectives are as follows: (1) to examine temporal and spatial temperature variations in the anti-frost heave subgrade structure across different cross-sections, with frost depths reaching 2.4–2.8 m; (2) to analyze changes in water content with depth and temperature, noting a 15 % drop in unfrozen water content near 0 °C in winter and a 10 % increase during thaw; (3) to characterize layered deformation evolution and its dynamics in relation to temperature and water content; and (4) to evaluate how the shady-sunny slope phenomenon and cross-sectional form affect subgrade stability. Key findings reveal that: (a) cross-section configuration strongly influences thermal state and water distribution within the subgrade; (b) the peak frost heave, ranging from 1.49 mm in embankments to 2.56 mm in cuttings, varies significantly with cross-section form; and (c) frost heave is affected by both frost penetration depth and the subgrade's hydrological conditions. These results provide a critical foundation for optimizing anti-frost heave subgrade design for high-speed railways in cold regions.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"346 ","pages":"Article 107898"},"PeriodicalIF":6.9,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929282","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":"Ancient very large and giant landslides on the eastern margin of the Qinghai–Tibet Plateau, China","authors":"Tianjun Qi,&nbsp;Xingmin Meng,&nbsp;Yan Zhao,&nbsp;Yajun Li","doi":"10.1016/j.enggeo.2024.107889","DOIUrl":"10.1016/j.enggeo.2024.107889","url":null,"abstract":"<div><div>The migration of massifs on the eastern margin of the Qinghai–Tibet Plateau (QTP) in the middle to late Cenozoic and the collision with stable blocks on the northwestern margin of the Yangtze Plate governed the rapid rock uplift and erosion of local surfaces, leading to the widespread occurrence of various types of large-scale landslides. An anomalously high concentration of very large and giant landslides (VLGLs) is found around the Bailongjiang block on the eastern margin of the QTP. While these landslides are commonly attributed to active faults, the diversity of landslide types and complex spatial relationships prompt further investigation into the tectonic mechanisms influencing their formation and evolution. In this study, we identify and validate 140 ancient VLGLs, each with an area ≥ 1 km², in the Bailong River Basin. We analyse the spatial distributions, geomorphological characteristics, and necessary controlling and triggering factors of various landslide types in the region. On the basis of limited chronological data, we infer potential periods of landslide formation by examining these controlling and triggering conditions. The results suggest that the primary driver of VLGLs development was the collision between the Bailongjiang block and the Bikou massif. Earthflows along the eastern margin of the Bailongjiang block are influenced mainly by faults, lithology, uplift, and river downcutting and are induced by rainfalls. The current landslide landscapes likely formed during the last interglacial period, following the onset of the Gonghe movement. The southern margin of the Bailongjiang block is characterized by compression uplift and degradation of the rock mass strength, and earthquakes act as triggers for debris slides. The coupling of these three factors indicates the potential for periodic patterns in landslide development within this region.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"346 ","pages":"Article 107889"},"PeriodicalIF":6.9,"publicationDate":"2024-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929302","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":"Elastoplastic model of statistical mechanics of rock masses (SMRM): Theory and verification","authors":"Tianmin Wang ,&nbsp;Jianhong Ye ,&nbsp;Faquan Wu ,&nbsp;Yongshuang Zhang ,&nbsp;Jianbing Peng","doi":"10.1016/j.enggeo.2024.107897","DOIUrl":"10.1016/j.enggeo.2024.107897","url":null,"abstract":"<div><div>The prediction of the deformation of jointed rock masses is one of the critical problems in the discipline of rock mechanics. Reasonably describing the effect of joint sets on the deformation of jointed rock masses within the framework of continuum mechanics has always been a goal pursued by scientists and engineers. An equivalent elastic constitutive model, named the statistical mechanics of rock masses (SMRM), had been developed to achieve the goal. However, since this model of SMRM initially did not consider the plastic deformation of rock masses, its application in rock engineering had always been constrained. In this study, an elastoplastic theory of the SMRM model is established by combining the classical elastic theory of SMRM and the classical Mohr-Coulomb strength criterion. Then, the reliability of the proposed elastoplastic SMRM model is extensively verified through a series of analytical solutions and experimental tests for jointed rock masses. It is indicated that the proposed elastoplastic SMRM model can effectively consider the spatial, mechanical and geometric characteristics of joint planes, and it can also effectively describe the influence of the density and orientation of joints on the strength and deformation of jointed rock masses. The elastoplastic SMRM model proposed in this study could potentially provide a new solution for some rock engineering problems.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"346 ","pages":"Article 107897"},"PeriodicalIF":6.9,"publicationDate":"2024-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929283","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":"Failure evolution and precursor prediction of fissured sandstone based on power-law behavior of electric potential","authors":"Tiancheng Shan ,&nbsp;Zhonghui Li ,&nbsp;Enyuan Wang ,&nbsp;Xin Zhang ,&nbsp;Haishan Jia ,&nbsp;Xiaoran Wang ,&nbsp;Enlai Zhao ,&nbsp;Yue Niu ,&nbsp;Dong Chen","doi":"10.1016/j.enggeo.2024.107896","DOIUrl":"10.1016/j.enggeo.2024.107896","url":null,"abstract":"<div><div>The engineering rock with defects is prone to induce serious geological disasters such as rockbursts under stress disturbance. Exploring the power-law failure prediction method of electric potential (EP) signals is effective and has great potential. In this study, the EP monitoring tests of the fissured red sandstone samples with variable crack angles under uniaxial compression were carried out. Spatiotemporal response, The Hurst statistical feature and Benioff-type power law of EPs were adopted to analyze the scale invariance of EPs and their relationship with damage evolution during rock failure. The failure prediction method based on Benioff potential and early warming assessment system were further proposed to predict the failure time range of potential rock instability in real time. The results show that with increasing crack angle, the mechanical strength and macroscopic crack number of samples reduce, and the power rate growth trend of EPs is delayed. The EP intensity increases closer to the crack propagation path, which is associated with the local damage and moving charged dislocations. Benioff potential of all samples shows power-law properties and is closely related to the internal damage evolution. With decreasing the remaining failure time, the variable power exponent <em>m</em>_<em>t</em> in the local temporal window gradually increases and approaches the upper limit of 1, indicating an increased possibility of potential catastrophic failure in rocks. The failure time range is predicted in real time through Benioff power behaviors with the upper and lower limits of <em>m</em>_<em>t</em>, and the prediction accuracy improves as the rock failure approaches.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"346 ","pages":"Article 107896"},"PeriodicalIF":6.9,"publicationDate":"2024-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929301","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":"Anisotropic hydration-induced cracking behavior of compacted bentonite","authors":"Yuhong Meng ,&nbsp;Qiong Wang ,&nbsp;Wei Su ,&nbsp;Weimin Ye ,&nbsp;Yonggui Chen","doi":"10.1016/j.enggeo.2024.107894","DOIUrl":"10.1016/j.enggeo.2024.107894","url":null,"abstract":"<div><div>In deep geological repositories, compacted bentonite subjected to hydration in the self-sealing process is prone to cracking due to uneven swelling deformation. In this paper, a series of hydration tests were carried out on compacted bentonite samples to investigate whether the anisotropy has an impact on the cracking behavior. The evolutionary process of hydration cracks was recorded by real-time image acquisition during the tests, while scanning electron microscopy (SEM) was performed after the tests to characterize the microstructure of compacted bentonite. Experiments show that there existed two distinctly different crack networks in the directions perpendicular and parallel to the compaction, respectively following a radial and a grid pattern of distribution. The complexity of the latter was obviously higher than that of the former, which was derived from the analysis of various quantitative parameters. SEM results indicate that the micromorphology of compacted bentonite was loose and rough in the perpendicular direction, but flat and smooth in the parallel direction. Conclusions thus can be drawn that the anisotropy exerted a significant effect on both the cracking pattern and cracking degree, which was the response of macroscopic cracking behavior to the microscopic structure characteristic. The stratified structure caused by uniaxial compaction highly affected the crack initiation and propagation, which determined the distribution and development of crack networks by influencing the cracking path and the energy consumption thereof. This paper provides a new insight into the anisotropy of compacted bentonite and has a practical significance to the barrier design of repositories in controlling the incidence of hydration cracks.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"346 ","pages":"Article 107894"},"PeriodicalIF":6.9,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142901783","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":"Formation mechanism of metastable internal support microstructure in Malan Loess and its implications for collapsibility","authors":"Jinduo Yang ,&nbsp;Xi-An Li ,&nbsp;Lincui Li ,&nbsp;Zhang Jing ,&nbsp;Weiping Wang","doi":"10.1016/j.enggeo.2024.107892","DOIUrl":"10.1016/j.enggeo.2024.107892","url":null,"abstract":"<div><div>Loess is formed from dust through wind transportation, sedimentation, and pedogenesis. Studying its initial sedimentary structure can elucidate the origin of loess microstructures and various engineering geological properties closely related to them. This study conducted wind tunnel experiments, scanning electron microscopy (SEM), and numerical simulations to analyze the microstructures of deposited dust and intact loess. The results revealed the following: (1) A novel internal support structure was widely observed in both deposited dust and intact loess, characterized by coarse silt particles as the skeleton and fine silt and adhesive components as the supporting elements. The former exhibited minimal adhesive components and was classified as “unstable,” whereas the latter possessed some adhesive components and was classified as “metastable.” (2) During pedogenesis, adhesive particles form bonding components under the influence of water, causing deposited dust to gradually evolve into intact loess without significant disturbance to the internal support structure. (3) The collapsibility of loess was primarily due to the breakdown of the bonding components in the metastable internal support structure of intact loess upon exposure to water. The metastable internal support structure identified in this study can be used to describe the collapse of loess from both macro- and micro-perspectives, providing new insights into the loess microstructure and the relationship between loess structure and engineering geological properties.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"346 ","pages":"Article 107892"},"PeriodicalIF":6.9,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889008","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":"Comparison between the Neo-deterministic Seismic Hazard and FEM approach to assessing 2D local seismic response at Chieti's city site (Abruzzo, Italy)","authors":"A. Ricci ,&nbsp;F. Romanelli ,&nbsp;F. Vaccari ,&nbsp;P. Boncio ,&nbsp;N. Venisti ,&nbsp;C. Faraone ,&nbsp;G. Vessia ,&nbsp;G.F. Panza","doi":"10.1016/j.enggeo.2024.107891","DOIUrl":"10.1016/j.enggeo.2024.107891","url":null,"abstract":"<div><div>A new application of the Neo-Deterministic Seismic Hazard Assessment (NDSHA) to free field seismic hazard at the site is illustrated. This physics-based scenario approach is used to assess the seismic response at Chieti's city center (Abruzzo, Italy) along a laterally varying representative section. The results are compared with those obtained through the AlgoShake2D Finite Element Method (from now on simply FEM) in the same section. Both methods employ a viscous-elastic rock and soil dynamic behavior. In addition, non-linear analyses are performed with FEM method. NDSHA models the directivity and the dispersion due to the medium anelasticity along the propagation path of P and S seismic waves incoming from the bedrock of the section, while FEM uses the popular but very simplified assumption of vertical upward propagation to the surface of only SH waves. FEM implements the equivalent linear approach to simulate the non-linear behavior of soil material under seismic wave solicitations. In Chieti's case study, both FEM and NDSHA results underline how much the stratigraphy contributes to the distortion (amplification/reduction) of the propagating perturbation compared to the reference regional average propagation (1D), as opposed to the topography. FEM acceleration response spectra (both viscous-elastic and equivalent-linear) are naturally enveloped by NDSHA 95% percentile spectrum although the median spectrum and the FEM mean spectrum show similar shapes. The NDSHA amplification functions are larger than the FEM ones, especially for periods lower than 0.5 s. This result can be attributed to the too-simplistic body wave propagation simulated by the FEM approach. The most amplified zone is located at the foothill and the amplification is 3.5 on average below 0.5 s. Although both methods predict a secondary role of the topographic effect, the NDSHA causal signals that consider the directivity of the wavefield, its complex refraction within the propagation medium (Chieti's vertical section), and some possible complexities of the earthquake source indicate that higher amplifications than FEM's ones should be accounted for when more realistic simulations are available. Based on the precautionary principle, given the complexity of real earthquakes, it is therefore natural to recommend the routine use of NDSHA.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"347 ","pages":"Article 107891"},"PeriodicalIF":6.9,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prediction of slope failure probability based on machine learning with genetic-ADASYN algorithm","authors":"Kai Zhong,&nbsp;Xiaohui Tan,&nbsp;Shanwei Liu,&nbsp;Zhitang Lu,&nbsp;Xiaoliang Hou,&nbsp;Qiao Wang","doi":"10.1016/j.enggeo.2024.107885","DOIUrl":"10.1016/j.enggeo.2024.107885","url":null,"abstract":"<div><div>In geotechnical engineering, precise probabilistic assessment of slope stability is crucial for risk management and the safe operation of engineering projects. To perform probabilistic assessments of slopes accurately and efficiently, six machine learning (ML) algorithms, including Logistic Regression (LR), Support Vector Machine (SVM), Decision Tree (DT), Random Forest (RF), Extremely Randomized Tree (ERT), and Gradient Boosting Tree (GBT), are adopted to establish surrogate models for the relationship between a slope's safety factor and soil's shear parameters. Latin Hypercube Sampling (LHS) is employed to generate training samples for constructing surrogate models using ML algorithms. Adaptive Synthetic Sampling (ADASYN) is used to balance the number of samples of failure and safety classes by generating synthetic samples for the failure sample set, and a Genetic algorithm (GA) is used to optimize the hyper-parameters of ML and ADASYN algorithms to improve the accuracy of the surrogate models. Two criteria are proposed to measure the accuracy of surrogate models built using ML with Genetic-ADASYN algorithms, and a formula is presented to estimate the optimal number of samples for the training set. Based on the surrogate models, reliability indices and failure probabilities of slopes can be readily estimated using the Monte Carlo Simulation Method (MCSM). Case studies of five slopes with different complexities are adopted to illustrate the proposed method for the probabilistic analysis of slope stability and to compare the accuracy of surrogate models built using different ML algorithms. Results show that the Genetic-ADASYN algorithm can significantly improve the accuracy of surrogate models built using ML algorithms, and among the six ML algorithms, GBT is the best ML algorithm due to its generalizability and accuracy in slope stability prediction problems. The research findings can provide a reference for risk assessment of slope engineering and help to improve the accuracy and efficiency of probabilistic slope stability analysis.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"346 ","pages":"Article 107885"},"PeriodicalIF":6.9,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889010","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}