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Scaling granular material with polygonal particles in discrete element modeling

Particuology 2023年第4期75卷 151-164页

作者： Alireza Ahmadi stefan larsson Carl Wersall KTH Royal Institute of Technology Division of Soil and Rock MechanicsBrinellvagen 2310044StockholmSweden

Despite advancements in computational resources,the discrete element method(DEM)still requires considerable computational time to solve detailed problems,especially when it comes to the large-scale *** addition to the geometry scale of the problem,the particle shape has a dramatic effect on the computational cost of ***,many studies have been performed with simplified spherical particles or *** scaling is an approach to increase the particle size to reduce the number of particles in the *** several particle scaling methods have been introduced,there are still some disagreements regarding their applicability to certain aspects of *** this study,the effect of particle scalping on the shear behavior of granular material is *** granular particles were scanned and imported as polygonal particles in the direct shear *** effect of particle size distri-bution,particle angularity,and the amount of scalping were *** results show that particle scalping can simulate the correct shear behavior of the model with significant improvement in computational ***,the accuracy of the scalping method depends on the particle angularity and particle size range.

关键词： Particle scaling Direct shear test Discrete element method PFC Polygonal shape Granular material

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Spatial distribution modeling of subsurface bedrock using a developed automated intelligence deep learning procedure:A case study in Sweden

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第6期13卷 1300-1310页

作者： Abbas Abbaszadeh Shahri Chunling Shan Emma Zall stefan larsson Division of Rock Engineering Tyréns ABStockholmSweden Johan Lundberg AB UppsalaSweden Division of Soil and Rock Mechanics KTH Royal Institute of TechnologyStockholmSweden

Due to associated uncertainties,modelling the spatial distribution of depth to bedrock(DTB) is an important and challenging concern in many geo-engineering *** association between DTB,the safety and economy of design structures implies that generating more precise predictive models can be of vital *** the present study,the challenge of applying an optimally predictive threedimensional(3D) spatial DTB model for an area in Stockholm,Sweden was addressed using an automated intelligent computing design *** process was developed and programmed in both C++and Python to track their performance in specified tasks and also to cover a wide variety of diffe rent internal characteristics and *** comparison to the ordinary Kriging(OK) geostatistical tool,the superiority of the developed automated intelligence system was demonstrated through the analysis of confusion matrices and the ranked accuracies of different statistical *** re sults showed that in the absence of measured data,the intelligence models as a flexible and efficient alternative approach can account for associated uncertainties,thus creating more accurate spatial 3D models and providing an appropriate prediction at any point in the subsurface of the study area.

关键词： Automated intelligence system Predictive depth to bedrock(DTB)model Three-dimensional(3D)spatial distribution

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Effects of spatial variation in cohesion over the concrete-rock interface on dam sliding stability

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Journal of Rock Mechanics and Geotechnical Engineering 2015年第6期7卷 659-667页

作者： Alexandra Krounis Fredrik Johansson stefan larsson Division of Soil and Rock Mechanics KTH Royal Institute of Technology

The limit equilibrium method （LEM） is widely used for sliding stability evaluation of concrete gravitydams. Failure is then commonly assumed to occur along the entire sliding surface ***, the brittle behaviour of bonded concrete-rock contacts, in combination with the varying stressover the interface, implies that the failure of bonded dam-foundation interfaces occurs progressively. Inaddition, the spatial variation in cohesion may introduce weak spots where failure can be ***, the combined effect of brittle failure and spatial variation in cohesion on the overall shearstrength of the interface has not been studied previously. In this paper, numerical analyses are used toinvestigate the effect of brittle failure in combination with spatial variation in cohesion that is taken intoaccount by random fields with different correlation lengths. The study concludes that a possible existenceof weak spots along the interface has to be considered since it significantly reduces the overallshear strength of the interface, and implications for doing so are discussed.

关键词： Concrete gravity dam Sliding stability Cohesion Brittle failure Spatial variation

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连续五年随访探索性分析:前交叉韧带断裂后关节液与血清中炎性细胞因子和蛋白多糖ARGS新生抗原表位及尿液中Ⅱ型胶原羧基端交联端肽和Ⅰ型胶原氨基端交联端肽的浓度变化

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实用骨科杂志 2015年第10期21卷 868-868页

作者： André Struglics Staffan larsson Nobuyuki Kumahashi Richard Frobell L.stefan Lohmander 李盛春卫小春魏垒山西医科大学第二医院骨科

随着国际交流的不断深入,越来越多的优秀稿件投往海外,为了更好地帮助中国骨科医生阅读外文文献,将最新的学术成果与国内同道一起分享,从本期开始,我们将陆续刊登介绍一些最新的外文文献,使中国骨科医生从中受益并及时了解国外的骨科动... 详细信息

随着国际交流的不断深入,越来越多的优秀稿件投往海外,为了更好地帮助中国骨科医生阅读外文文献,将最新的学术成果与国内同道一起分享,从本期开始,我们将陆续刊登介绍一些最新的外文文献,使中国骨科医生从中受益并及时了解国外的骨科动态,敬请关注。

关键词：抗原表位交叉韧带断裂关节液探索性分析骨科医生 ARGS 蛋白多糖炎性细胞因子外文文献羧基端

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