Bulletin of Engineering Geology and the Environment最新文献

{"title":"Study of advanced dewatering and its influence on tunnel in water rich and sandy dolomite stratum","authors":"Yifan Jiang,&nbsp;Jinyi Li,&nbsp;Feicong Zhou,&nbsp;Qi Yongli,&nbsp;Hua Huang,&nbsp;Xiaobing Li,&nbsp;Zhijie Wang,&nbsp;Ping Zhou","doi":"10.1007/s10064-023-03381-3","DOIUrl":"10.1007/s10064-023-03381-3","url":null,"abstract":"<div><p>The influence of groundwater on sandy dolomite stratum renders it highly susceptible to disasters, resulting in frequent water inrush accidents during tunnel construction. Advanced dewatering is crucial in enhancing tunnel face stability. It is found that sandy dolomite comprises a porous permeable medium consisting of dolomite sand and dolomite powder, characterized by low shear resistance and deformation resistance. Through the fluid–solid coupling model test device developed, it has been proven that the release of pore water pressure via advanced dewatering substantially enhances the stability of the tunnel face in water-rich sandy dolomite stratum prone to seepage failure. By conducting fluid–solid coupling analysis, the impact of drainage pipe length on the dewatering effect is investigated, and the improvement in tunnel face stability due to varying drainage pipe lengths is evaluated using the limit equilibrium analysis method. It is observed that drainage pipes reduce the range of slip body in front of the tunnel face and mitigate seepage forces by dissipating pore water pressure, consequently enhancing tunnel face stability and reducing extrusion deformation. However, there exists an efficiency limit regarding drainage pipe length. For initial water levels of 30, 50, 80, and 120 m, it is recommended to employ advanced drainage pipes of 20, 25, 30, and 40 m or more, respectively.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"82 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42374943","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}

{"title":"Risk assessment of the Sedongpu high-altitude and ultra-long-runout landslide in the lower Yarlung Zangbo River, China","authors":"Yang Gao,&nbsp;Bin Li,&nbsp;Haoyuan Gao,&nbsp;Shaohua Gao,&nbsp;Meng Wang,&nbsp;Xiaojie Liu","doi":"10.1007/s10064-023-03374-2","DOIUrl":"10.1007/s10064-023-03374-2","url":null,"abstract":"<div><p>The Tibetan Plateau is an area that is highly prone to high-altitude and ultra-long-runout landslides. The Sedongpu landslide is one very typical case. Aiming at high-altitude and ultra-long-runout landslides, and taking Sedongpu basin as an example, this study tries to establish analytical method through historical interpretation, potential source interpretation, numerical back-analysis, dynamic parameters acquisition, and numerical prediction analysis. The following results were obtained: (1) the high-altitude and ultra-long-runout landslide has obvious vertical and horizontal zoning characteristics, the vertical falling height difference and runout distance are linearly correlated to the complicated dynamic characteristics, which is one of the reasons why this type of disaster cannot be evaluated by conventional risk assessment methods. (2) Based on remote-sensing technology, the historical landslides events in 2018 were interpreted, and five potential high-altitude geo-risk areas were detected. There is still a very high geological disaster risk. (3) Through back- and prediction-analysis in numerical simulations, it was determined that the height of the Sedongpu landslide dam will reach 120 m and 165 m under general condition and extreme condition. The purpose of this study was to propose an alternative risk assessment method, which is of great significance for geo-risk prediction and mitigation.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"82 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43594454","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}

{"title":"Hydrochemistry process and microweathering behaviour of sandstone heritages in the Nankan Grotto, China: Insights from field micro-observations and water–rock interaction experiments","authors":"Xuening Zhang,&nbsp;Sixiang Ling,&nbsp;Xiyong Wu,&nbsp;Fengrui Wang,&nbsp;Jie Wang,&nbsp;Qiang Teng,&nbsp;Jiawen Xie","doi":"10.1007/s10064-023-03378-y","DOIUrl":"10.1007/s10064-023-03378-y","url":null,"abstract":"<div><p>Geochemical analyses of groundwater samples and water‒rock interaction experiments were conducted to elucidate the hydrochemical process of the water‒rock interactions in the Nankan mountainside. Additionally, the mineralogy and microstructure of field sandstone samples were analysed to explore the microweathering behaviour of minerals in the Nankan Grotto. The results indicated that the cations in the groundwater followed the concentration order of Ca²⁺  &gt; Mg²⁺ ≈ Na⁺  &gt;  &gt; K⁺, while the anion concentrations were in the order of HCO₃⁻  &gt;  &gt; NO₃⁻  &gt; SO₄²⁻ ≈ Cl⁻. The Piper, Gibbs, and ion correlation diagrams suggested that the groundwater was characterized as HCO₃-Ca type. Three stages, the calcite dissolution stage (Stage I), feldspar weathering stage (Stage II), and faint‒weathering stage (Stage III) were observed in the water‒rock interaction experiments. Based on microscopic petrographical analysis, the dissolution of calcite released bulk Ca²⁺ and HCO₃⁻, and this was the primary hydrochemical process that accounted for the HCO₃-Ca type groundwater. The weathering of biotite to chlorite-(Mg) introduced Mg²⁺ and K⁺. The weathering of albite and plagioclase-TIMA to sericite or other clay minerals released Na⁺ and Ca²⁺ into the solution. Slight weathering of K-feldspar released minor amounts of K⁺ into the solution. The abovementioned weathering processes resulted in the poor cementation and loose microstructure of the sandstone, leading to the macroscopic deterioration of the sandstone heritage site. Our research revealed the deterioration mechanisms of the sandstone in the Nankan Grotto, which paves the way for the subsequent conservation of sandstone heritage sites.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"82 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43034686","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}

{"title":"Probabilistic machine learning for predicting desiccation cracks in clayey soils","authors":"Babak Jamhiri,&nbsp;Yongfu Xu,&nbsp;Mahdi Shadabfar,&nbsp;Susanga Costa","doi":"10.1007/s10064-023-03366-2","DOIUrl":"10.1007/s10064-023-03366-2","url":null,"abstract":"<div><p>With frequent heatwaves and drought-downpour cycles, climate change gives rise to severe desiccation cracks. In this research, a probabilistic machine learning (ML) framework is developed to improve the deterministic models. Therefore, a complete set of data-driven soil and environment parameters, including initial water content (IWC), crack water content (CWC), final water content (FWC), soil layer thickness (SLT), temperature (Temp), and relative humidity (RH), is utilized as inputs to predict the crack surface ratio (CSR). Also, a comprehensive set of MLs, including an ensemble of regression trees (i.e., random forests [RF] and regression trees [RT]), gradient-boosted trees (viz. GBT and XGBT), support-vector machines (SVM), and artificial neural network-particle swarm optimization (ANN-PSO), is developed for predictions. Monte Carlo simulation (MCS) is then employed to insert uncertainties in the given models via shuffling and randomizing samples. Two sensitivity analyses, in particular input exclusion and partial dependence-individual conditional expectation plots, are further established to assess the prediction reliability. Results indicate that the performance ranking of developed MLs can be put as SVM &gt; GBT &gt; XGBT &gt; ANN-PSO &gt; RF &gt; RT. However, according to the probabilistic modeling based on the MCS, GBTs are highly capable for predictions with the lowest errors and uncertainties. The performance order of the models in terms of the higher coefficient of determination and lower standard deviation is GBT &gt; SVM &gt; XGBT &gt; RF &gt; ANN-PSO &gt; RT. The sensitivity analyses also categorized the parameter importance in the order of FWC &gt; CWC &gt; SLT &gt; IWC &gt; Temp &gt; RH. These findings demonstrate the immense capabilities of probabilistic MLs under uncertainties by measuring prediction error variances and hence improving performance precision.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"82 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43205673","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}

{"title":"A frozen soil sampling technique for granular soils and thermal modeling","authors":"Mostefa Hani,&nbsp;Burak Evirgen","doi":"10.1007/s10064-023-03372-4","DOIUrl":"10.1007/s10064-023-03372-4","url":null,"abstract":"<div><p>This study uses a new sampling approach to allow undisturbed sampling without damaging the natural conditions of granular soils, thanks to the artificial ground freezing (AGF) method via a double-independent closed-circulation mechanism, over a 48-h period at ? 15 °C. The mechanical properties, textural characteristics, and freezing-thawing observations of three types of granular soils are investigated. The temperature distribution around freezing pipes, the shape of the frost line, and the degree of ice saturation were observed through a thermal simulation by a two-dimensional finite element analysis software, Plaxis 2D. The unconfined compressive strength and strain values of molded and cored specimens are compared. The coring samples are about 2.56 times stronger than the molded ones, depending on the method of soil sampling procedure in the same type of soil. The well-graded sandy samples (SW) achieve up to 1.05 and 2.95 MPa of force values in the molded and coring samples, respectively. Moreover, according to the types of soils, in the SW specimens, 1.57- and 1.39-fold strength values are obtained for poorly graded sand (SP) and well-graded gravel (GW) samples in the molded artificially frozen sampling process, respectively, as well as 1.17- and 1.09-fold strength increments in the coring frozen sampling process within the same order. The results of thermal module simulation nearly match those obtained using laboratory-based tests. The efficiency of the proposed sampling approach has been proven to represent actual on-site behavior. Besides, the strength results are perfect in this method with respect to traditional sampling methods.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"82 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4599424","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}

{"title":"Experimental study on ultrasonic characteristics of frozen sandstone under uniaxial compression","authors":"Xihao Dong,&nbsp;Shuai Liu,&nbsp;Hailiang Jia","doi":"10.1007/s10064-023-03343-9","DOIUrl":"10.1007/s10064-023-03343-9","url":null,"abstract":"<div><p>As one of the main means of non-destructive testing, ultrasonic waves?can effectively detect damage inside rock, which provides an important basis for the evaluation of rock mechanical properties. This study investigates the ultrasonic characteristics of frozen sandstone during loading and the effect of?different temperatures. Combined with the deformation and failure process of the?frozen sandstone sample, variation in ultrasonic velocity, amplitude, frequency spectrum, quality factor, and energy during loading were analyzed. The results show that (1) the amplitude of ultrasonic first?increased, then decreased, then increased again with the increase in axial stress (<span>(sigma_{1})</span>), and decreased with the decrease in temperature. (2) The amplitude and arrival time of the first wave decreased as the temperature decreased. The amplitude of the first wave increased with the increase in <span>(sigma_{1})</span>, while the arrival time is reversed. (3) The ultrasonic velocity (<span>(v_{p})</span>) increased as the temperature decreased. <span>(v_{p})</span> increased rapidly in the compaction stage and increased slowly in the elastic stage. Before the peak stress, when the stress level of sandstone samples was 0.88–0.93, <span>(v_{p})</span> reached its peak?and then decreased rapidly due to the initiation and expansion of cracks. (4) The spectral peaks increased with the increase in <span>(sigma_{1})</span> and decreased with the decrease in temperature. In addition, the quality factor and accumulated energy of the?ultrasonic increase first and then decrease during loading. The relationship between the?ultrasonic velocity and stress of frozen sandstone at different temperatures was established using logarithmic function?fitting.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"82 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4857519","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}

{"title":"Investigation of the rock failure effect on overcoring stress relief test in deep hard rock","authors":"Minzong Zheng,&nbsp;Shaojun Li,&nbsp;Huaisheng Xu,&nbsp;Zhiqiang Liang,&nbsp;Xingan Lu","doi":"10.1007/s10064-023-03377-z","DOIUrl":"10.1007/s10064-023-03377-z","url":null,"abstract":"<div><p>The failure of a rock core will result in the inaccuracy of in situ stress tests when the overcoring stress relief method is used in deep rock engineering. To investigate the stress test error caused by rock failure, stress test simulations under different loading conditions and post-peak parameters are designed and implemented. The results show that the stress measurement error increases exponentially as the degree of rock core failure increases. The greater the severity of the rock failure, the greater the estimation error of each stress component. The strain test error is the primary cause of stress test error, not the residual stress at the rock core. Based on this, the applicable conditions of the overcoring stress relief method are analyzed. To keep the stress test error within an acceptable range, the test borehole axis should be kept close to the direction of the maximum principal stress. Additionally, the fracture depth should be less than 0.2 times the radius of the pilot hole. This research will provide the basis for the error analysis of stress test results and optimization of a borehole drilling process for the overcoring stress relief method in deep hard rock engineering.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"82 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10064-023-03377-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4561936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Probabilistic slope stability analysis considering the non-stationary and spatially variable permeability under rainfall infiltration-redistribution","authors":"Xueyou Li,&nbsp;Xian Liu,&nbsp;Yadong Liu,&nbsp;Zhiyong Yang,&nbsp;Limin Zhang","doi":"10.1007/s10064-023-03351-9","DOIUrl":"10.1007/s10064-023-03351-9","url":null,"abstract":"<div><p>The non-stationary and spatially variable permeability <i>k</i>_<i>s</i> can have a significant influence on the process of rainwater infiltration and redistribution in a soil slope and further affect the slope stability and the slope failure time after a rain event. However, there has been limited research on the influence of non-stationary and spatially variable <i>k</i>_<i>s</i> on the stability and the failure time of soil slopes. This paper aims to investigate how the non-stationary and spatially variable <i>k</i>_<i>s</i> affects the soil slope stability and the most probable failure time (MPFT) of the slope considering the rainwater infiltration and redistribution. To achieve this purpose, an integrated probabilistic analysis framework is proposed by coupling the non-stationary <i>k</i>_<i>s</i> random field into a slope model for the probabilistic slope seepage analysis based on Monte Carlo simulations. An unsaturated soil slope subjected to rainfall is taken as an illustrative example to demonstrate the influence of non-stationary and spatially variable <i>k</i>_<i>s</i> on the slope stability. The results show that the location of the slip surface with minimum factor of safety continuously changes during the process of the rainwater infiltration-redistribution. Ignoring the effect of decreasing trend of <i>k</i>_<i>s</i> will result in an underestimation of the failure probability of slope even if the spatial variability of<i> k</i>_<i>s</i> is considered. The MPFT of slope will be earlier if the non-stationary characteristics of <i>k</i>_<i>s</i> is considered.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"82 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4787555","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}

{"title":"DEM investigation of the mechanical behavior of frozen soil along various stress paths","authors":"Ruohan Sun,&nbsp;Run Liu,&nbsp;Huan Zhang,&nbsp;Chun Liu,&nbsp;Chengfeng Li","doi":"10.1007/s10064-023-03367-1","DOIUrl":"10.1007/s10064-023-03367-1","url":null,"abstract":"<div><p>Understanding the mechanical characteristics of frozen soil is critical for engineering projects in cold regions. A series of case studies were conducted to explore the macroscopic and microscopic mechanical behavior of frozen soil during four different stress paths, i.e., isotropic, constant stress ratio, conventional triaxial, and true triaxial compression tests, using the distinct element method (DEM). The particle-scale mechanism and temperature effect of frozen soil are also taken into account in the DEM simulation. The results indicate that the peak stress/yield stress of frozen soil decreases with the increase of temperature or decrease of stress ratio or decrease of intermediate principal stress ratio <i>b</i>, which is related to the evolutions of bond breakage, bond stress, mechanical coordination number, and deviatoric fabric. When 0.25?≤?<i>b</i>?≤?0.75, the direction of strain increment deviates from the direction of stress. In addition, the relationship between the damage variable <i>B</i> and the volumetric strain ε_<i>v</i> or shear stain ε_<i>s</i> can be expressed as <span>(B=1-mathrm{exp}(-acdot {varepsilon }_{v}^{n}))</span> or <span>(B=1-mathrm{exp}(-acdot {varepsilon }_{s}^{n}))</span> under different stress paths. The simulation results and revealed microscopic mechanism will be valuable in developing breakage-mechanics-based constitutive models for frozen soil.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"82 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10064-023-03367-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4787554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Shear strength-dilation characteristics of coral sand contained fines","authors":"Xue Li,&nbsp;Jiankun Liu,&nbsp;Zhaohui Sun","doi":"10.1007/s10064-023-03349-3","DOIUrl":"10.1007/s10064-023-03349-3","url":null,"abstract":"<div><p>Coral sand (CS) always contain different contents of fines and consequently cause some changes to shear behavior which is distinct from the regular silicious sand. To examine the effects of stress level (<i>σ</i>₃), fines (FS), and relative density (<i>D</i>_<i>r</i>) on shear strength-dilation behaviors of CS, a series of consolidated drained tests and gray correlation analysis were conducted. Results show that peak strength of sandy soil improved by increasing <i>σ</i>₃ and <i>D</i>_<i>r</i> but reduced as increasing FS content. However, the peak strength loss rate <i>η</i> increased with an increase of <i>D</i>_<i>r</i> or FS content but decreased as increasing <i>σ</i>₃. In addition, strain softening of mixture was aggravated by increasing <i>σ</i>₃, <i>D</i>_<i>r</i>, and FS percentage. Particularly, the shear dilatancy of mixture transformed to shear contraction as <i>σ</i>₃ increased from 200 to 400 kPa. Maximum angle of dilation has an approximate linear relation with peak-state friction angle. Gray correlation analysis indicated that the influence of stress level and FS content on peak strength and strain-softening of sandy soil is more prominent than <i>D</i>_<i>r</i>. Furthermore, when <i>D</i>_<i>r</i> increased or FS content decreased, the internal friction angle of mixture increased linearly. The cohesion force of mixture has a positive linear relation with <i>D</i>_<i>r</i> while appears a hyperbolic relation with FS content. Based on the concept of equivalent void ratio, the grain contact and mixture phase were discussed. Finally, the modified Mohr-Coulomb criterion of mixture was proposed considering <i>D</i>_<i>r</i> and FS content.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"82 9","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4787562","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}