Granular Matter最新文献

{"title":"Effect of particle breakage on vibration compaction deformation of gap-graded granular mixtures under different fine particle content via DEM simulations","authors":"Chuhan Huang,&nbsp;Xingxin Duan,&nbsp;Zhihong Nie,&nbsp;Chuanfeng Fang,&nbsp;Yufei Huang","doi":"10.1007/s10035-025-01521-y","DOIUrl":"10.1007/s10035-025-01521-y","url":null,"abstract":"<div><p>Particle breakage is an important factor affecting the mechanical properties of granular materials. In this study, the influence of particle breakage under different fine particle content is investigated by DEM. Through 3D scanning and Voronoi tessellations, the breakable particle model with realistic shape is constructed. A series of confined cyclic loading tests were performed at different fine particle content. Then, the particle breakage characteristics, including the degree of breakage and the breakage pattern, were evaluated. In addition, the compaction deformation was analyzed according to the evolution of porosity. Finally, the influence mechanism of particle breakage is explained from two perspectives of particle contact and particle motion. On the one hand, with the increase of fine particle content, the number of contacts on the coarse particles is increasing. Hence, the coarse particles can withstand greater forces without breaking. On the other hand, the displacement of coarse particles and the porosity decrement have very similar evolution curve. This indicates that the Z-axis displacement of coarse particles can directly reflect the variation of sample porosity. In addition, particle breakage has little effect on particle rotation. The effect of particle breakage on porosity is mainly realized through the effect of particle translation rather than particle rotation.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 2","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769908","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":"Effect of particle shape on the discharge from a mono-layer hopper","authors":"Muhammad Ahmed Hanif,&nbsp;Diego Maza,&nbsp;Devaraj van der Meer","doi":"10.1007/s10035-025-01517-8","DOIUrl":"10.1007/s10035-025-01517-8","url":null,"abstract":"<div><p>In this work, we performed experiments with spheres, rice-shaped particles with different aspect ratios, and macaroni-shaped particles in a quasi-two-dimensional hopper, where the thickness was adjusted to the minor dimensions of the particles such that a mono-layered system is created. We quantitatively investigate the vertical velocity and solid fraction profiles at the orifice and determine how these are influenced by the slope of the hopper. Interestingly, where the hopper angle hardly influences the velocity profile for rice-shaped particles, the magnitude of the velocity profile increases for spherical particles and decreases for macaroni particles with the steepness of the hopper. The spheres have flat solid fraction profiles for all hopper angles, but a transition from flat to dome-shaped profiles is observed with decreasing hopper steepness for all non-spherical particles. The discharge rate determined by integrating the product of the velocity and solid fraction profiles has good agreement with the experimentally measured discharge rate for all particle shapes.</p><h3>Graphical Abstract</h3><p>Experimental images of discharge of (a) spheres, (b) rice (a_s), (c) rice (a_l), and (d) macaroni particles. (e) Discharge rate of different particle shapes with hopper angles.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 2","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-025-01517-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749209","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":"The effect of imbrication on the porosity value of non-uniform gravel bed: a case study from the Buëch River, France","authors":"Wenjia Xu,&nbsp;Catrina Brüll,&nbsp;Holger Schüttrumpf,&nbsp;Roy M. Frings","doi":"10.1007/s10035-025-01508-9","DOIUrl":"10.1007/s10035-025-01508-9","url":null,"abstract":"<div><p>Existing porosity predictors for fluvial sediments are mainly derived from laboratory-generated, randomly packed sediment samples. However, such predictors could not adequately describe beds with non-random grain arrangements that occur widely in fluvial deposits. In this work, the effect of grain imbrication on non-uniform gravel-bed porosity has been quantified using fluvial sediment samples showing imbrication and no imbrication collected from the river Buëch, France. The in-situ porosity of the undisturbed samples was directly measured on-site, while the ex-situ porosity was measured by randomly packing the particles of a sample in a cylindrical container in the laboratory. The in-situ porosity and the ex-situ porosity of the same sample were compared. Apart from the porosity measurement, a relatively new and simple workflow was applied to quantify the degree of bed imbrication based on the X-Ray Computed Tomography images of frozen sediment samples. For samples showing no imbrication, the in-situ and the ex-situ porosity showed similar values, indicating that sediment samples randomly packed in the laboratory (with shaking) are well representative of the fluvial sediment with random grain orientation formed under natural conditions. For samples showing imbrication, the in-situ porosity values were about 30% lower than their ex-situ porosity values, indicating denser packing structure due to imbrication. This increase in structural compactness is believed to stem from the ordered arrangement of sediment particles, thereby reducing the formation of large pores.</p><h3>Graphical Abstract</h3><p>(<b>a</b>) Comparison of the n_in-situ and n_ex-situ of samples showing imbrication and no imbrication, (<b>b</b>) Dip direction distribution, (<b>c</b>) Imbricated particles</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 2","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-025-01508-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594508","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":"An adaptative discretization to model boundary value problems with discrete element method","authors":"Sébastien H. E. Volcy,&nbsp;Luc Sibille,&nbsp;Bruno Chareyre,&nbsp;Christophe Dano,&nbsp;Hamid Hosseini-Sadrabadi","doi":"10.1007/s10035-024-01503-6","DOIUrl":"10.1007/s10035-024-01503-6","url":null,"abstract":"<div><p>An adaptive discretization method is introduced to develop numerical models for boundary value problems using the Discrete Element Method. This method involves discretizing a domain, with smaller particles in regions of interest—where the material undergoes large displacements and irreversible deformations—while continuously increasing particle sizes elsewhere, as distance from these regions of interest increases. While maintaining uniform mechanical properties within the whole simulation domain through appropriate scaling of contact model parameters, this approach presents the main benefit to substantially reduce the number of particles in the model, thereby lowering computational costs, without making the numerical method itself more cumbersome. This method is applied and assessed in the context of modeling a Cone Penetration Test within a calibration chamber.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 2","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594663","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":"Investigating peak strength of gap-graded soils through discrete element method: mechanisms and prediction","authors":"Shanlin Xu,&nbsp;Lingkai Hu,&nbsp;Honglei Sun,&nbsp;Bo Wang,&nbsp;Feng Gao,&nbsp;Mingyuan Wang","doi":"10.1007/s10035-025-01511-0","DOIUrl":"10.1007/s10035-025-01511-0","url":null,"abstract":"<div><p>Gap-graded soils, extensively utilized in geotechnical and hydraulic engineering, exhibit diverse strength characteristics governed by their distinctive particle size distribution (PSD). To investigate the influence of PSD on the shear strength of gap-graded soils, this study utilizes the Discrete Element Method (DEM) to reproduce drained conventional triaxial tests of gap-graded soils across a wide range of fine particle content (FC = 1-40%) and particle size ratio (SR = 2.5-6.0). The simulation results reveal that the peak shear strength follows a characteristic unimodal curve versus FC, attaining its maximum value at about FC = 25%. SR governs peak strength through critical FC thresholds: negligible impact at FC &lt; 10%, whereas significant enhancement occurs at FC = 25%. Micromechanical analysis reveals that branch anisotropy evolution controls strength behaviour. Shear strength inversely correlates with peak branch anisotropy as reduced branch anisotropy promotes homogenized contact force distribution. FC and SR collectively regulate macroscopic strength through coupled control of branch anisotropy evolution, where their synergistic interaction governs force chain reorganization and stress distribution homogeneity. Based on these insights, a novel predictive formula for peak strength incorporating both SR and FC were proposed, providing guidance for optimized deployment of gap-graded soils in engineering practice.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 2","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594507","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":"Multi-scale morphological quantification of particle based on altitude-to-chord ratio","authors":"Huayu Qi,&nbsp;Wei Liu,&nbsp;Da Yang,&nbsp;Fuyuan Qin","doi":"10.1007/s10035-025-01512-z","DOIUrl":"10.1007/s10035-025-01512-z","url":null,"abstract":"<div><p>Quantification of particle morphology plays a crucial role in studying the physical properties of materials. Current methods for quantifying particle morphology using image analysis technology have many limitations. To address this issue, we propose a morphology quantization approach based on the principle of altitude-to-chord ratio, referred to as the ACR morphology quantization approach. This approach calculates corresponding descriptors for particle surface texture, angularity, and form across three different scales of morphological characteristics. It has established a multi-scale quantitative method to describe particle morphology. The surface texture descriptor calculated therein is unaffected by macroscopic scale variations and exhibits strong stability. Utilization of angularity descriptor results in sorting outcomes that are completely identical with manual visual assessments when applied to Krumbein’s standard particle chart and Powers’ angularity grading chart. It can also distinguish particles with different levels of angular grades within these charts quite distinctly. The form descriptors focus on how close the particles approximate to a circle along with the macroscopic scale of the particles. And it is possible to measure the distance between the concave boundary and the opposite edge in concave particles, which is a piece of information that is often overlooked in existing descriptors. Through the calculation of actual particles, it was demonstrated that the ACR quantification approach provides a complete and objective characterization of particles and the quantified results are consistent with human subjective perceptions.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 2","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594662","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":"Effect of confining stress and lateral boundary conditions on the drained instability response of sand: a DEM based assessment across the length scales","authors":"Madhu Sudan Negi,&nbsp;Mousumi Mukherjee","doi":"10.1007/s10035-025-01509-8","DOIUrl":"10.1007/s10035-025-01509-8","url":null,"abstract":"<div><p>Instabilities in geomaterials significantly influence its strength mobilization and often act as a precursor to failure in geotechnical structures. Such instabilities in a granular assembly can vary drastically from localized to a diffused mode owing to the changes in density state, i.e. from a dense to a loose one. The present study elucidates the effect of confining stress and lateral boundary conditions on the mechanisms associated with these instability modes through particle-scale observations and relates it to the macro-scale shearing response of the specimen with a particular focus on the density state. In this regard, 2D DEM simulations of drained biaxial test have been carried out for the dense and loose sand specimens at different initial confining stress, and under both flexible and rigid lateral boundary conditions. Analysis of force chain network indicates that the formation of higher number of elongated strong force chains increases the susceptibility of local buckling of strong force chain in dense specimen, resulting emergence of shear bands. Conversely, buckling of a large number of strong force chains of smaller lengths, distributed across the loose specimen, causes diffused instability as can be perceived from the scattered large particle rotation and relative displacement field. Assessment on fabric anisotropy reveals that, with increasing confinement, the weak force chain network provides enhanced lateral support to the strong force chain network and retards the force chain buckling process, resulting in a reduction in the shear band thickness and delayed peaks in the macro-scale strength response. Shear band thickness and inclinations are noticed to be higher for rigid lateral boundaries, which due to constraint kinematics leads to a constant shear band inclination regardless of the level of confinement.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 2","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143564368","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":"Theoretical study on the inherently anisotropic MICP-cemented sand by micromechanics-based model","authors":"Zhihao Zhou,&nbsp;Huaning Wang,&nbsp;Mingjing Jiang","doi":"10.1007/s10035-025-01514-x","DOIUrl":"10.1007/s10035-025-01514-x","url":null,"abstract":"<div><p>Microbially induced calcite precipitation (MICP) is a promising technology for soil improvement, where the treated soil can be regarded as the structural one. In this study, a micromechanics-based model is proposed to investigate the mechanical behaviors of inherently anisotropic MICP-cemented sand, which consists of a hexagonal close-packed (HCP) particle assembly (2D) composed of bonded elliptical particles with same size. A size-dependent bond failure criterion is adopted to define the microscopic mechanical reactions between the particles to model the nonlinear characteristics of the soil. Based on the homogenization theory and lattice model, the stress–strain relationship, strength criteria, and corresponding macroscopic mechanical parameters with respect to microscopic parameters for MICP-cemented sand are derived and verified by DEM simulation based on the regularly arranged particle assembly. The effects of key parameters, including cement content, initial void ratio, inherent anisotropy, and confining pressure, on the mechanical behaviors of MICP-cemented sand is investigated in detail, and the good agreement between the theoretical solution and laboratory test results validates the applicability of the theoretical solution for analyzing MICP-cemented sand.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 2","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143564444","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":"Evaluating the plate compactor frequency effect on compaction efficiency: numerical study with discrete element method","authors":"Karol Brzeziński","doi":"10.1007/s10035-025-01515-w","DOIUrl":"10.1007/s10035-025-01515-w","url":null,"abstract":"<div><p>The operating frequency of the compaction equipment plays a pivotal role in the efficiency of the compaction process. However, it is not clear whether it is only the result of the frequency-dependent load amplitude or the frequency itself (affecting the dynamics of soil structure). This problem is difficult to solve experimentally since the operating frequency is strictly related to the load amplitude for specific equipment. In this paper, a numerical DEM simulation is conducted that allows compaction to be simulated with a centrifugal force independent of the compaction frequency. First, the material model is calibrated by taking into account particle size distribution, shapes, and mechanical behaviour. Next, the model is utilised in the simulation of compaction with a plate compactor at the operating frequency range of 50–90 Hz. The results obtained correspond well to the physical experiment and allow for additional conclusions to be drawn. The only advantage of compaction with higher frequency is the increased force amplitude. If the force amplitude is maintained, the same void ratio can be obtained for lower frequencies.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 2","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521783","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":"A DEM study on the effects of specimen and particle sizes on direct simple shear tests","authors":"Mohammad Zeraati-Shamsabadi,&nbsp;Abouzar Sadrekarimi","doi":"10.1007/s10035-025-01513-y","DOIUrl":"10.1007/s10035-025-01513-y","url":null,"abstract":"<div><p>The direct simple shear (DSS) test serves as a vital method in geotechnics, allowing the measurement of peak and post-liquefaction shear strengths, along with the critical state friction angle of soils. Additionally, the simple shearing mode applied in a DSS test is the predominant failure mode in many geotechnical engineering problems. Although the DSS test is widely used to determine soil strength, a significant challenge with the DSS device is the non-uniformity of stress and strain distributions at the specimen boundaries. This non-uniformity depends on not only the specimen size but also the size of soil particles. The influence of specimen size on boundary effects is typically evaluated using the ratio of specimen diameter (<i>D</i>) to height (<i>H</i>). The median particle diameter (<i>D</i>_<i>50</i>), as an indicator of a soil’s particle size, could be another influential factor affecting the non-uniformities of stress and strain on specimen boundaries in a DSS test. Through three-dimensional discrete element method (DEM) simulations, this research explores these factors. Specimens were generated with a particle size distribution (PSD) scaled from a coarse sand sample. Laboratory monotonic DSS testing results on the coarse sand were employed to calibrate the DEM model and ascertain the modeling parameters. Boundary displacements were regulated to maintain a constant-volume condition which represents undrained shearing behavior. Various specimen diameters were simulated with identical void ratios to investigate the influence of <i>D/H</i> on stress path, peak and post-peak shear strengths, and critical state behavior. DEM simulations allowed the generation of several particle size distributions through different scaling factors applied to the sand gradation to determine the combined effect <i>D</i>_<i>50</i> and <i>D/H</i>. Limiting <i>D/H</i> and <i>D</i>_<i>50</i><i>/D</i> ratios are subsequently proposed to mitigate specimen boundary effects.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 2","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521782","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}