Granular Matter最新文献

{"title":"The influence of water sorption on the microstructure of a hydro-sensitive granular material (couscous) deduced from simultaneous neutron and X-ray tomography","authors":"Ilija Vego,&nbsp;Alessandro Tengattini,&nbsp;Nicolas Lenoir,&nbsp;Gioacchino Viggiani","doi":"10.1007/s10035-023-01356-5","DOIUrl":"10.1007/s10035-023-01356-5","url":null,"abstract":"<p>The effects of water on the behaviour of granular materials can be significant. Besides capillary bridges, several other chemo-hydro-mechanical processes can affect the response of hydro-sensitive granular assemblies, when water sorption critically alters the individual particles properties (i.e., swelling, deterioration of mechanical properties). It is very common to find such materials in food and pharmaceutical industries, where water sorption can often lead to important resources waste while processing or storing the product. It is therefore necessary to understand the phenomena that affect the material’s functionality, often related to particle agglomeration and degradation. However, despite the relevance of the problem, our knowledge about these phenomena is still relatively poor. With this study we aim to explore the link between water content increase and particle, contacts and assembly scale phenomena. Simultaneous neutron and X-ray tomography allows us to investigate respectively the water uptake and microstructure evolution of two couscous assemblies exposed to high relative humidity while subjected to constant stress, a configuration chosen to simulate the conditions in an industrial silo-storage. We acquire a data-set of images, from which we follow and quantify the variations of water content distribution and the resulting volumetric response of thousands of particles through bespoke algorithms. Despite the abundance of water provided, we observe spatial gradients in water content distribution and consequently in particle swelling. We find that the relation between these two variables can be described as (quasi-)linear. The contact area growth also seems to follow a similar trend.</p>","PeriodicalId":582,"journal":{"name":"Granular Matter","volume":"25 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-023-01356-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42973016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Energy transport and dissipation in granular systems","authors":"Kostas Senetakis","doi":"10.1007/s10035-023-01340-z","DOIUrl":"10.1007/s10035-023-01340-z","url":null,"abstract":"&lt;div&gt;&lt;p&gt;The study of energy transport in granular systems can involve a number of different angles to view the problem; for example, one can propagate sinusoidal waves within the granular assembly, which makes the particles vibrate; besides the large wavelength low-amplitude elastic limit, this can be at very large frequencies and medium-large amplitudes, thereby posing the particles in perturbations of different modes, like resulting in cyclic shear, which can be translational and/or rotational as well as oblique collisions between the particles to occur. If these particles are naturally occurring grains, they will have a far from classical “elastic” response and their morphologies will be evolving during these perturbations. If a viscous fluid is added, then the dynamics of these perturbations and the way the energy is transferred among the particles may be substantially different. One may wish to see this problem even at a smaller scale, examining only two perturbating particles in contact, or allowing them to impact each other in the presence of a fluid. If you load the granular system in a cyclic mode, but this time at a very low frequency, some mechanisms will be altered, and the way the energy will be dissipated may also be expected to be altered, thereby the interpretations made from such analysis. Of course, a granular assembly is often part of a larger system that we are interested in to study by stability analysis, as e.g. internal erosion, or the dynamics of a submarine landslide involving an extraordinarily large span of particle sizes and morphologies. Taking as example research works in soil dynamics, the rate of stiffness decrease in a granular system, caused by the nonlinearity of that system, is proportional to the rate of energy dissipation increase as macroscopically measured in medium-frequency torsional shear dynamic excitation. However, if the excitation amplitude is reduced enough to lead to measurements of elastic stiffness, some small dissipation of energy might still be observed, which generally contradicts principles of classic continuum mechanics. These, and many others are interesting and exciting, though challenging areas of research in granular matter, in which scientists from a wide span of expertise are working to provide answers, and perhaps raise more questions about what is happening in a granular system.&lt;/p&gt;&lt;p&gt;The topical collection “Energy transport and dissipation in granular systems” aimed to provide a forum bringing together scientists and engineers from different disciplines to answer some simple, though challenging questions about what the involved mechanisms of energy transport and dissipation in granular systems are, and extending these towards understanding, how micromechanical-based features influence the macroscopic behavior of larger-scale systems involving particles or powders. Finally, we could see very proudly that a total of 18 high-quality articles were contributed and published under this to","PeriodicalId":582,"journal":{"name":"Granular Matter","volume":"25 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44352341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Behavioural responses to horizontal vibrations of quasi-2D ideal granular beds: an experimental approach","authors":"J. Moss,&nbsp;R. Glovnea","doi":"10.1007/s10035-023-01354-7","DOIUrl":"10.1007/s10035-023-01354-7","url":null,"abstract":"<div><p>In this experimental study, granular bed response to horizontal vibrations of various frequencies and amplitudes are examined with high-speed imaging. Ideal granular beds consisting of spherical glass beads are horizontally vibrated in a quasi-two-dimensional arrangement, firstly with homogeneous granular media and then with a ternary mixture to explore how bed response deviates with changes to material composition. Phenomena of note are the tendency for the homogeneous material to subdivide into discrete areas of crystalline lattice structures, bounded by non-crystalline lines of bead contacts, labelled in this paper as ‘shear lines’. Shear line failure arises as neighbouring crystalline areas slide relative to one another along their shared non-crystalline border, combining to form one larger crystalline area. Under vibration conditions where particle agitation and relative movement is high, sloshing occurs in the upper bed and triangular granular-gas regions form in the top corners. The ternary mixture also exhibits sloshing at low frequency and large amplitude, but the inhomogeneity of its composition prevents formation of ordered crystalline regions and shear lines, instead promoting low percolation and a jamming effect underneath the sloshing region. Surprisingly strong convective responses are induced in the inhomogeneous bed with more energetic vibrations. From the analysis of shear lines in the homogeneous beds, and of convection in the inhomogeneous beds, comparisons between homogeneous and inhomogeneous bed behaviour are drawn. Results are used to discuss how behavioural response of non-cohesive granular material to horizontal vibrations is ultimately tied to, and changes with, the geometric complexity of the internal packing structure. The concept of ‘geometric compatibility’ between constituent particle species in an inhomogeneous granular medium is proposed as an explanation for the low percolation and strong convective response to vibration.</p><h3>Graphical abstract</h3>\u0000 <div><figure><div><div><picture><source><img></source></picture></div></div></figure></div>\u0000 </div>","PeriodicalId":582,"journal":{"name":"Granular Matter","volume":"25 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-023-01354-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44475292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"3-D contact and pore network analysis of MICP cemented sands","authors":"N. Roy,&nbsp;J. D. Frost,&nbsp;D. Terzis","doi":"10.1007/s10035-023-01347-6","DOIUrl":"10.1007/s10035-023-01347-6","url":null,"abstract":"<div><p>The study describes a comprehensive methodology to evaluate X-Ray micro-computed tomography data from sand samples and to characterize their 3D microstructural properties. Fine and medium-grained sands are analyzed in their natural and bio-cemented states. While the two materials exhibit similar peak and residual strengths in their untreated state, they yield distinctly different strength improvements in their bio-cemented state, despite similar cementation contents. To understand the underlying mechanisms that govern this behavior, a recently developed approach is presented to gain new insights into the specimen’s micro-architecture. Results capture a series of properties such as the volume distribution of pore bodies, pore throats, particles, interparticle contacts, precipitation bonds, and distribution of tortuous paths. It is found that the intrinsic, i.e., pre-cementation microstructural properties, are crucial in determining the spatial distribution of post-cementation bonds. Furthermore, the volume of bonds at interparticle contacts and in throats governs the overall contact area, directly reflecting interparticle stress transmission. Contact area increases by 180% for the medium-grained sand compared to 120% for the fine-grained. Overall, the methodology introduced in this study forms a new basis for understanding biocementation and can contribute to a more robust formulation of simulation models incorporating pore and contact mechanics in porous media.</p><h3>Graphic abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":582,"journal":{"name":"Granular Matter","volume":"25 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44870859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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-simulation of thin elastic membranes interacting with a granulate","authors":"Holger Götz,&nbsp;Thorsten Pöschel","doi":"10.1007/s10035-023-01344-9","DOIUrl":"10.1007/s10035-023-01344-9","url":null,"abstract":"<div><p>For a wide range of applications, we need DEM simulations of granular matter in contact with elastic flexible boundaries. We present a novel method to describe the interaction between granular particles and a flexible elastic membrane. Here, the standard mass-spring model approach is supplemented by surface patches given by triangulation of the membrane. In contrast to standard mass-spring models, our simulation method allows for an efficient simulation even for large particle size dispersion. The novel method allows coarsening of the mass-spring system leading to a substantial increase in computation efficiency. The simulation method is demonstrated and benchmarked for a triaxial test.</p></div>","PeriodicalId":582,"journal":{"name":"Granular Matter","volume":"25 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-023-01344-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51844039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Dissipation behavior of granular balls in a rotating closed cylinder","authors":"Yan Chen,&nbsp;Huajia Zhong,&nbsp;Kai Zhang,&nbsp;Meng Chen","doi":"10.1007/s10035-023-01342-x","DOIUrl":"10.1007/s10035-023-01342-x","url":null,"abstract":"<div><p>The discrete element method is used to study the dissipation behavior of the granular balls in a rotating closed cylinder under the Earth gravity environment, and five kinds of particle motion forms with different dissipation characteristics are obtained. These phases are slumping, rolling, cascading, cataracting and centrifuging. Combined with the simulation of the dissipation behavior of the granular system under the Mars and Moon environment, the universality and the mechanism of the high dissipation effect of the cataracting phase is studied. In addition, based on the dissipation behavior of the granular balls in the rotating closed cylinder, the optimization design of the autogenous mill lifter is studied, and finally a design method of the structure parameters of the autogenous mill based on the material dissipation behavior is proposed.</p><h3>Graphical Abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":582,"journal":{"name":"Granular Matter","volume":"25 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4573287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Granular meta-material: response of a bending beam","authors":"Holger Götz,&nbsp;Thorsten Pöschel","doi":"10.1007/s10035-023-01336-9","DOIUrl":"10.1007/s10035-023-01336-9","url":null,"abstract":"<div><p>Jammed granular matter can be considered a meta-material that behaves viscoelastic for small deformations. We characterize the elastic properties of the meta-material through the response of a simply supported bending beam consisting of jammed granular matter under weak load and quasistatic deformation.</p></div>","PeriodicalId":582,"journal":{"name":"Granular Matter","volume":"25 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-023-01336-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4494322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Numerical and experimental estimation of anisotropy in granular soils using multi-orientation shear wave velocity measurements","authors":"Mandeep Singh Basson,&nbsp;Alejandro Martinez","doi":"10.1007/s10035-023-01345-8","DOIUrl":"10.1007/s10035-023-01345-8","url":null,"abstract":"<div><p>Soils can have direction-dependent characteristics reflected in the anisotropy of their responses. Studies have demonstrated the impact of the stress state and history (i.e., stress-induced anisotropy) and the depositional processes and particle arrangements (i.e., fabric-induced anisotropy) on the anisotropy of macroscopic behaviors. However, quantifying the stress- and fabric-induced anisotropies remains a challenge. This study presents two investigations on the effects of stress- and fabric-induced anisotropy on the anisotropy of shear wave velocity (V_S). A framework based on the V_S measurements along various orientations and polarization planes obtained from discrete element method (DEM) simulations and experimental bender element (BE) tests is presented; this framework is tested using the results from specimens of spherical and non-spherical particles under isotropic and 1D compression. The observed trends indicate that the angular distributions of V_S are related to the angular distributions of particle alignment and interparticle contact forces. This framework, when presented in terms of the ratio of V_S measurements along different orientations and polarization planes and of the newly introduced Anisotropy parameter (A_e), can assist in evaluating the stress- and fabric-induced anisotropy of soil specimens. The results also highlight the challenges in discerning the effects of stress and fabric anisotropy when both influence the soil response.</p><h3>Graphical abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":582,"journal":{"name":"Granular Matter","volume":"25 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4461683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic sublevel caving technology for thick seams with large dip angle in longwall top coal caving (LTCC)","authors":"Wei Weijie,&nbsp;Pan Weidong,&nbsp;Zhang Jinwang,&nbsp;Zhao Zhining,&nbsp;Yang Liu,&nbsp;Zhang Xiangyang","doi":"10.1007/s10035-023-01351-w","DOIUrl":"10.1007/s10035-023-01351-w","url":null,"abstract":"<div><p>Dynamic sublevel caving technology (DSCT) proposed by the researchers is one of effective methods to solve the problems of low top coal recovery, poor drawing balance and support stability in longwall top coal caving (LTCC) with large dip angle. To investigate the reasonable number of supports in a sublevel (<i>N</i>) and the top coal drawing mechanisms under DSCT, this research takes Panel 7401 in Zouzhuang Coal Mine as the geological background. Firstly, the optimal threshold value of <i>N</i> is theoretically analyzed, and the numerical simulations of drawing experiments under different <i>N</i>s are calculated. The results show that when <i>N</i> = 3, the top coal recovery is the highest, the number of excessive drawing top coal at the upper end is relatively small, and the drawing balance is great, which is conducive to improving the resource recovery and safety management. With increasing <i>N</i>, the over-development of right top coal boundary towards the upper end increases, the range of coal ridge in the lower sublevel also gradually increases, while the strong force chain area at the upper end gradually decreases, resulting in the support stability becoming worse. In addition, the displacement of top coal at the upper end gradually increases with increasing <i>N</i>, and the permanent loss feature of residual top coal exists in the upper sublevel. The field top coal recovery under DSCT was measured finally, obtaining that DSCT can improve the top coal recovery by about 5% and promote the stability and working efficiency of the support. The research results have great theoretical and guiding significance for the high yield and high efficiency LTCC technology for thick coal seam with large dip angle.\u0000</p><h3>Graphical Abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":582,"journal":{"name":"Granular Matter","volume":"25 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-023-01351-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4464826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Continuous bidirectional shear moduli monitoring and micro X-ray CT to evaluate fabric evolution under different stress paths","authors":"Kazem Fakharian,&nbsp;Farzad Kaviani-Hamedani,&nbsp;Ali Sooraki,&nbsp;Mostafa Amindehghan,&nbsp;Ali Lashkari","doi":"10.1007/s10035-023-01339-6","DOIUrl":"10.1007/s10035-023-01339-6","url":null,"abstract":"<div><p>Fabric evolution monitoring of sandy specimens during shearing up to critical state is characterized by continuous, bidirectional shear wave velocity measurements along the vertical and horizontal directions <i>(V&amp;H).</i> The specimens are prepared by water sedimentation methods and then subjected to drained compression and extension loading paths. The results exhibit a significant differences between shear wave velocities in two orthogonal directions, and subsequently shear moduli, as shear develops. Not only do the differences between shear wave velocities in V and H directions illuminate a severe and increasing soil anisotropy during the shearing, but the results also signify promising information related to the current fabric and stress state. Comparison between compression and extension results highlight different fabric evolution trends and consequently dissimilar fabric states at the critical state. Considering the conforming results with recent findings on the basis of the discrete element method (DEM), the proposed method can be used as an experimental method facilitating the macroscopic investigation of the effects of fabric anisotropy on the soil elastic response. The fabric anisotropy and its evolution are assessed consecutively using three methods, including quantitative evaluation of shear moduli, proposing a fabric function to account for the soil fabric, and 3D microscopic inspection of Micro-CT slices<i>.</i> The findings of the mentioned methods agree on the importance of fabric anisotropy in shear wave propagation and microscopic variations towards the critical state evolving from the initial state to dissimilar anisotropic states at the critical state under different shear modes.</p></div>","PeriodicalId":582,"journal":{"name":"Granular Matter","volume":"25 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5121673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}