Granular Matter最新文献_第8页

Acoustic emission behaviour at soil–metal interfaces during shearing: micro to macro insights 剪切过程中土壤-金属界面的声发射行为：微观到宏观的见解

IF 2.4 3区工程技术

Granular Matter Pub Date : 2025-02-28 DOI: 10.1007/s10035-025-01516-9

Satyam Dey, Prashanth Vangla

{"title":"Acoustic emission behaviour at soil–metal interfaces during shearing: micro to macro insights","authors":"Satyam Dey, Prashanth Vangla","doi":"10.1007/s10035-025-01516-9","DOIUrl":"10.1007/s10035-025-01516-9","url":null,"abstract":"<div><p>The study of acoustic emissions (AE) at soil-metal interfaces has gained increasing attention in geotechnical engineering due to its potential for developing acoustic-based early warning systems for structural stability and safety monitoring. Existing studies have paid limited attention to the fundamental mechanisms underlying soil-metal interface shearing across micro to macro scales and their associated acoustic emissions (AE). This study investigated the soil-metal interface shear and their AE responses through systematic tests using macromechanical and micromechanical interface shear testing apparatus, critically analyzing the shear response, geotribological aspects, and AE responses in the time and frequency domains to gain deeper insights and understand their interrelationships. The results revealed that soil-metal interface shear response and AE intensity (amplitude and frequency content) increased as normal stress and particle angularity increased. Unlike the shear response, the increase in displacement rate leads to a considerable increase in AE. Furthermore, the analysis of the test results reveal that the AE of soil-metal interfaces are strongly affected by the hardness of the continuum material, which, in turn, governs particle breakage and shear-induced surface changes during shearing. The novel micromechanical shear tests revealed that there is no AE during plowing, strain softening, or hardening; emissions are only observed when asperity breakage occurs, followed by micro-tapping during shearing. The findings of this study significantly advance the understanding of soil-structure interaction from an AE perspective and contribute to the design of efficient AE-based early warning devices.</p></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":"143521784","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}

引用次数: 0

Effect of fabric anisotropy on filtration mechanisms in granular filters 织物各向异性对颗粒过滤器过滤机理的影响

IF 2.4 3区工程技术

Granular Matter Pub Date : 2025-02-17 DOI: 10.1007/s10035-024-01485-5

Ali Abdallah, Eric Vincens, Hélène Magoariec, Christophe Picault

引用次数: 0

A modular hypoplastic constitutive model for granular soils 颗粒土的模量低塑性本构模型

IF 2.4 3区工程技术

Granular Matter Pub Date : 2025-02-14 DOI: 10.1007/s10035-025-01510-1

Tim Pucker

引用次数: 0

Research on the development of a monitoring experimental platform for top coal migration trajectory in longwall top coal caving and optimization of coal drawing process 长壁放顶煤运移轨迹监测实验平台开发及放煤工艺优化研究

IF 2.4 3区工程技术

Granular Matter Pub Date : 2025-02-07 DOI: 10.1007/s10035-025-01507-w

Zhining Zhao, Weidong Pan, Cang Deng, Xinyuan Li, Suyu Liang

{"title":"Research on the development of a monitoring experimental platform for top coal migration trajectory in longwall top coal caving and optimization of coal drawing process","authors":"Zhining Zhao, Weidong Pan, Cang Deng, Xinyuan Li, Suyu Liang","doi":"10.1007/s10035-025-01507-w","DOIUrl":"10.1007/s10035-025-01507-w","url":null,"abstract":"<div><p>Understanding the migration trajectory characteristics of top coal in longwall top coal caving (LTCC) is crucial for studying the flow properties of granular top coal, drawing laws, and optimizing the coal drawing process. To monitor the migration trajectory of top coal during the drawing process, an experimental platform was developed for monitoring the top coal migration trajectory in LTCC. Using this platform, physical simulation experiments of LTCC were conducted. A multi-step experimental procedure was designed, including “model construction, marker point installation, simulated coal drawing, data collection, and trajectory inversion.” The migration trajectories of top coal at different layers during the coal drawing process were obtained, and the drawing body of top coal was inferred. Additionally, a bi-directional top coal drawing body equation was theoretically derived, establishing a quantitative relationship between the gangue content (cumulative and instantaneous) and top coal recovery. Based on this, field process optimization was carried out, adjusting the “four-level” method to a double-opening group coal drawing method. The instantaneous gangue content threshold at the coal drawing openings was set to 35%. The measured top coal recovery at the working face reached 90.12%, an increase of approximately 14.87% points compared to the previous recovery. The cumulative gangue content was controlled at around 9.25%, and the coordination efficiency of coal caving reached 68.2%, which is close to the theoretically derived results. This indicates that the theory can provide certain theoretical guidance for determining relevant process parameters in coal drawing operations.</p><h3>Graphical Abstract</h3><p>Top - Coal Migration Trajectory and Optimization of Coal Caving Technology</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":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143362059","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}

引用次数: 0

Liquefaction mechanisms of sand deposits with silt interlayer 粉砂夹层砂体液化机理研究

IF 2.4 3区工程技术

Granular Matter Pub Date : 2025-02-05 DOI: 10.1007/s10035-024-01494-4

Ye Yang, Mincai Jia

{"title":"Liquefaction mechanisms of sand deposits with silt interlayer","authors":"Ye Yang, Mincai Jia","doi":"10.1007/s10035-024-01494-4","DOIUrl":"10.1007/s10035-024-01494-4","url":null,"abstract":"<div><p>Liquefaction behaviors of sand deposits with impervious stratum are quite different from that of homogeneous geological conditions. However, the micro- liquefaction behaviors of the interlayered deposits have been infrequently documented. This study introduces a novel experimental methodology aimed at examining the influence of silt interlayer on the liquefaction mechanisms of sand deposits from both macro and micro perspectives. In the experiments, the Excess Pore Water Pressure (EPWP) was analyzed in conjunction with recorded micro liquefaction images. The migration mechanism of fine sand particles beneath the silt interlayer was revealed. The existence of low permeability interlayer leads to prolonged retention of EPWP beneath the silt interlayer. Substantially, the water film on the base of the interlayer is demonstrated to be the mixture of pore water and silt particles flowing with high velocity under seismic motions, thereby resulting in significant strain localization. An agminated zone of loose fine sand particles is usually generated beneath the silt interlayer after the dissipation of EPWP.</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":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184787","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}

引用次数: 0

The study of motion characteristics of detectors based on magnetic localization technology in a soft granule system 软颗粒系统中基于磁定位技术的探测器运动特性研究

IF 2.4 3区工程技术

Granular Matter Pub Date : 2025-01-31 DOI: 10.1007/s10035-024-01491-7

Yu Pan, Quan Chen, Ran Li, Tongtong Mu, Haijun Gui, Ping Kong

{"title":"The study of motion characteristics of detectors based on magnetic localization technology in a soft granule system","authors":"Yu Pan, Quan Chen, Ran Li, Tongtong Mu, Haijun Gui, Ping Kong","doi":"10.1007/s10035-024-01491-7","DOIUrl":"10.1007/s10035-024-01491-7","url":null,"abstract":"<div><p>The motion of wireless capsule endoscopes (WCE) in the gastrointestinal tract is complex and variable. Measuring its motion patterns accurately is crucial for optimizing diagnostic, therapeutic procedures and improving diagnostic accuracy. To gain a deeper understanding of the motion patterns of WCE in the gastrointestinal tract, particularly its behavior in different regions. A simulation measurement system based on magnetic localization technology is proposed in a laboratory environment. We designed a cylindrical-conical-cylindrical structure simulation device. The free fall motion of soft hydrogel granules is designed to mimic fluid motion in the gastrointestinal tract. A hard-targeted pellet with a permanent magnet simulated the WCE. It measured parameters such as trajectory, vertical velocity, vertical acceleration, and attitude angle of the targeted pellet during its drop at different initial positions in a silo during unloading in a soft granules environment were measured. The experimental results reveal the motion characteristics of a hard pellet in a silo during unloading in a soft granules environment, in the specific wide channel region, as well as in the transition region from the wide channel to the narrow channel. These findings are valuable for understanding the complexity of flow behaviours in different regions of the soft granules environment. And, these findings provide data references for understanding the dynamic behavior of WCE in the gastrointestinal tract, thereby aiding in optimizing WCE design and enhancing its clinical efficacy.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143110168","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}

引用次数: 0

Development and performance assessment of a novel mechatronic assisted air pluviation system for reconstitution of cohesionless soils 一种用于无黏性土壤重构的新型机电辅助通风系统的开发与性能评价

IF 2.4 3区工程技术

Granular Matter Pub Date : 2025-01-28 DOI: 10.1007/s10035-025-01505-y

Punit Bhanwar, A. Sandeep Reddy, Trudeep N. Dave

{"title":"Development and performance assessment of a novel mechatronic assisted air pluviation system for reconstitution of cohesionless soils","authors":"Punit Bhanwar, A. Sandeep Reddy, Trudeep N. Dave","doi":"10.1007/s10035-025-01505-y","DOIUrl":"10.1007/s10035-025-01505-y","url":null,"abstract":"<div><p>Analyzing geotechnical problems associated with granular material like cohesionless soil typically necessitate constitution of a physical model exhibiting a homogenous soil structure. Such well-conditioned model aids in reliable and reasonable interpretation of soil’s in-situ behavior under controlled conditions. However, such well-conditioned model needs to be reconstituted multiple times with a high degree of consistency. To this motive, the present study aims at the development and performance assessment of a novel mechatronic assisted air pluviation system (MAPS). The modular design of MAPS and the user commanded mechatronics integrated within its operational ecosystem were smartly used to facilitate a uniform and controlled reconstitution of specimen from a cohesionless soil. The reconstitution performance of MAPS was assessed by conducting several air pluviation trails with a poorly graded fine sand (D<sub>50</sub> = 0.22 mm), and further examining the effect of pluviation control parameter such as height of fall, sieve porosity, number of diffuser sieve, and diffuser ratio on characteristics of reconstituted sand. A wide range of relative density, ranging from 12 to 90% was achieved for reconstituted specimen upon utilizing the developed MAPS. Further, the mean coefficient of variation in relative density in horizontal and vertical direction of specimen was found to be well within acceptable limit of 5% and 7% respectively.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109370","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}

引用次数: 0

Experimental exploration of geometric cohesion and solid fraction in columns of highly non-convex Platonic polypods 高度非凸柏拉图多面体柱的几何内聚力和固体分数的实验探索

IF 2.4 3区工程技术

Granular Matter Pub Date : 2025-01-17 DOI: 10.1007/s10035-024-01490-8

David Aponte, Jonathan Barés, Mathieu Renouf, Emilien Azéma, Nicolas Estrada

{"title":"Experimental exploration of geometric cohesion and solid fraction in columns of highly non-convex Platonic polypods","authors":"David Aponte, Jonathan Barés, Mathieu Renouf, Emilien Azéma, Nicolas Estrada","doi":"10.1007/s10035-024-01490-8","DOIUrl":"10.1007/s10035-024-01490-8","url":null,"abstract":"<div><p>In this study, we investigate the stability and solid fraction of columns comprised of highly non-convex particles. These particles are constructed by extruding arms onto the faces of Platonic solids, a configuration we term <i>Platonic polypods</i>. We explore the emergence and disappearance of solid-like behavior in the absence of adhesive forces between the particles, referred to as <i>geometric cohesion</i>. This investigation is conducted by varying the number of arms of the particles and the thickness of these arms. To accomplish this, columns are assembled by depositing particles within a cylindrical container, followed by the removal of the container to evaluate the stability of the resulting structures. Experiments were carried out using three distinct materials to assess the influence of the friction coefficient between the grains. Our findings reveal that certain granular systems exhibit geometric cohesion, depending on their geometrical and contact properties. Furthermore, we analyze the initial solid fraction of the columns, demonstrating that these arrangements can achieve stability even at highly loose states, which contrasts with traditional granular materials.</p><h3>Graphical Abstract</h3><p>The particles were Platonic polypods with varying arm thickness and different numbers ofarms. Depending on their shape and friction characteristics, these systems can exhibit either frictional or cohesivebehavior.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994946","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}

引用次数: 0

Evolution of a contact force network in a 2D granular assembly: II—the impact of particle plasticity 二维颗粒装配中接触力网络的演化：ii -颗粒塑性的影响

IF 2.4 3区工程技术

Granular Matter Pub Date : 2025-01-17 DOI: 10.1007/s10035-025-01504-z

O. Kirstein, C. M. Wensrich

引用次数: 0

Particulate behaviour of soft granular materials: a case study on lentils 软颗粒材料的颗粒行为：小扁豆的案例研究

IF 2.4 3区工程技术

Granular Matter Pub Date : 2025-01-17 DOI: 10.1007/s10035-025-01506-x

Saurabh Singh, Beatrice Anne Baudet, Matthew Richard Coop

{"title":"Particulate behaviour of soft granular materials: a case study on lentils","authors":"Saurabh Singh, Beatrice Anne Baudet, Matthew Richard Coop","doi":"10.1007/s10035-025-01506-x","DOIUrl":"10.1007/s10035-025-01506-x","url":null,"abstract":"<div><p>In this article, lentils are used as a case study to characterise the particulate behaviour of soft granular materials. Experiments were carried out on a single lentil particle or a pair of lentils. The single particle or a pair of particles in contact were compressed vertically to crushing or to a fixed vertical load. Then, in inter-particle tests, pairs of particles were slid over each other at a constant vertical load, and the tangential stiffness and coefficient of friction were estimated. The pairs of lentil particles in contact were also subjected to repeated normal and tangential loading. The presence or absence of the cover of lentil particles (shell) was found to affect their behaviour significantly under these loading conditions. The lentil particles have a very compliant shell and stiff core in normal loading; the stiffness of the shell is constant, and the core follows Hertz contact law. The lentil particles show less variability in their crushing strength, with high Weibull modulus (~ 10), in comparison to other natural granular materials like sand. With repeated cycles of vertical loading, the contact between a lentil pairs of particles becomes more stiff and less damp. In tangential loading, the coefficient of friction between lentil particles decreases with normal force while the contact stiffness increases. Further, in cyclic tangential loading, the coefficient of friction decreases and the contact stiffness increases with cycles. A simple contact model is also proposed to use in discrete element simulations.</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 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-025-01506-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995009","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}

引用次数: 0