Computational Particle Mechanics最新文献_第4页

Study on the microstructural evolution of gangue cemented backfill under uniaxial compression 单轴压缩下矸石胶结充填体微观结构演化研究

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2024-10-05 DOI: 10.1007/s40571-024-00821-z

Dongmei Huang, Xin Pan, Xikun Chang, Shuyu Qiao, Daqian Xing, Xinzhao Wang

引用次数: 0

Digging characteristics of grab based on DEM-MBD simulation and experiment 基于DEM-MBD的抓斗挖掘特性仿真与实验

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2024-10-01 DOI: 10.1007/s40571-024-00823-x

Fangping Ye, Tianye Lu, Chang Xu

{"title":"Digging characteristics of grab based on DEM-MBD simulation and experiment","authors":"Fangping Ye, Tianye Lu, Chang Xu","doi":"10.1007/s40571-024-00823-x","DOIUrl":"10.1007/s40571-024-00823-x","url":null,"abstract":"<div><p>The grab bucket plays an important role in the construction process of dredging, and analyzing the excavation characteristics of the grab is helpful for the mechanical design of the grab bucket. In this investigation, the digging device and the digging mudstone are detailed as a system dynamic process, and a theoretical model for calculating digging resistance is established based on the Rankine theory. Furthermore, the particle shear test is performed to analyze the influence of changes in sand physical parameters on its shear characteristics. The DEM-MBD coupling simulation is adopted to calculate the particle distribution and the digging trajectory, and the influence of digging depth and particle cohesion strength is analyzed on the digging resistance. Moreover, an excavator digging experimental platform is established to validate the feasibility of the experimental results. The results show that the 10% moisture content is the inflection point of the sand particles physical and mechanical properties, and its shear strength decreases with the augment of moisture content; the variation law of the simulation results is consistent with the theoretical calculation, and the digging resistance reduction is proportional to the cohesion strength when the particles are completely sheared; the same key point parameter error of the digging curve obtained by the test and the simulation are consistent.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 1","pages":"573 - 584"},"PeriodicalIF":2.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553704","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

Study on mesoscopic mechanism of water inrush in foundation pit based on discrete element method 基于离散元法的基坑突水细观机理研究

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2024-09-29 DOI: 10.1007/s40571-024-00827-7

Yuqi Li, Yue Wang, Junhao Zhang, Bingbing Ma, Mingyue Zhang

{"title":"Study on mesoscopic mechanism of water inrush in foundation pit based on discrete element method","authors":"Yuqi Li, Yue Wang, Junhao Zhang, Bingbing Ma, Mingyue Zhang","doi":"10.1007/s40571-024-00827-7","DOIUrl":"10.1007/s40571-024-00827-7","url":null,"abstract":"<div><p>With the development of urbanization, a large number of foundation pits have been built. Water inrush is one of the most important causes of foundation pit accidents, and it is of great significance to understand the process and mechanism of water inrush. A laboratory small-scale water inrush test at foundation pit base was established by using discrete element method and numerical simulation was conducted on the water inrush failure of aquitard. The water inrush process of Shanghai clay ⑤<sub>1</sub> was divided into continuous deformation stage, equilibrium stage, and failure stage. The mechanism of water inrush failure was explained from a mesoscopic perspective, and the trend of the development and evolution of cracks was studied. The variation laws of monitoring variables such as porosity, coordination number, and the particle displacement of observation points were analyzed. The influences of vertical weak area in pit base and the thickness and properties of aquitard on water inrush were further discussed. The research work in this paper not only provides a new perspective for the analysis of water inrush failure in foundation pits, but also provides a reference for the simulation of fluid–solid coupling in other geotechnical engineering.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 1","pages":"613 - 630"},"PeriodicalIF":2.8,"publicationDate":"2024-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143554021","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

Improving the tensile strength of reinforced concrete: evaluating the impact of different fiber additives through numerical and experimental analysis 提高钢筋混凝土抗拉强度：通过数值和实验分析评价不同纤维添加剂对混凝土抗拉强度的影响

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2024-09-28 DOI: 10.1007/s40571-024-00839-3

Jinwei Fu, Vahab Sarfarazi, Hadi Haeri, Zhihao Wang, Mohammad Fatehi Marji

{"title":"Improving the tensile strength of reinforced concrete: evaluating the impact of different fiber additives through numerical and experimental analysis","authors":"Jinwei Fu, Vahab Sarfarazi, Hadi Haeri, Zhihao Wang, Mohammad Fatehi Marji","doi":"10.1007/s40571-024-00839-3","DOIUrl":"10.1007/s40571-024-00839-3","url":null,"abstract":"<div><p>This research investigates the effect of various fibers on the strength and flexibility of concrete from an educational perspective. In this research, the use of additives including types of fibers (macrosynthetic fibers, polypropylene, and glass fibers) which make up 1% of the volume of hybrid concrete is taught. The combined addition of these fibers to create the hybrid reinforced concrete with high tensile strength and plasticity is discussed in this education. The tensile strength results obtained from direct and indirect methods have significant differences. In the concrete laboratory, multiple experiments were carried out to determine the best fiber composition using two different types of fibers. The experiments included direct tensile testing using the compressive-to-tensile force conversion (CTFC) method, which is a new approach, and indirect tensile testing using the Brazilian disk method. The loading rate for the tests was 1 kg/sec. The average tensile strength was 3.3 MPa, and the average compressive strength was 35 MPa. The Young’s modulus was measured to be 20 GPa. The results showed that macrosynthetic fibers were more effective in increasing the concrete’s tensile strength compared to other combinations. The tests performed on the effects of combining glass fibers with macrosynthetic fibers compared to combining macrosynthetic fibers with polypropylene show a more effective tensile strength. In this article, the direct tensile strength of concrete samples is evaluated by introducing an innovative tensile test device with a ring-shaped sample. The results obtained from this new device have been numerically compared with the uniaxial direct tension method proposed by ISRM. The educational measures of this new knowledge regarding concrete additives and performing innovative tensile strength tests and comparing them with each other provide a detailed understanding of concrete strength evaluation.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 1","pages":"775 - 792"},"PeriodicalIF":2.8,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143554004","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

DEM analysis of load transfer in double-layer geosynthetic-reinforced pile-supported embankments 双层土工合成筋桩支撑路堤荷载传递的DEM分析

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2024-09-25 DOI: 10.1007/s40571-024-00834-8

Rong Sun, Xin Jiang, Lei Zhang, Canyang Cui, Mian Zhang, Zhengxian Li, Yanjun Qiu

{"title":"DEM analysis of load transfer in double-layer geosynthetic-reinforced pile-supported embankments","authors":"Rong Sun, Xin Jiang, Lei Zhang, Canyang Cui, Mian Zhang, Zhengxian Li, Yanjun Qiu","doi":"10.1007/s40571-024-00834-8","DOIUrl":"10.1007/s40571-024-00834-8","url":null,"abstract":"<div><p>In recent years, geosynthetic-reinforced pile-supported (GRPS) embankments have gathered increasing attention in the scientific community for their effectiveness in improving soft ground. This study aims to investigate the load transfer of double-layer GRPS embankments using the discrete element method (DEM), with a focus on soil arching effects and membrane effects. A coefficient, denoted as <i>η</i> and defined as <i>h</i>/<i>H</i>, was introduced to study the influence of the distance between two geosynthetics on load transfer. The results indicated: (1) Double-layer GRPS embankments demonstrated uniform load transmission downwards, thereby reducing the large deformation zone within the embankment fill. (2) Maximum tension in geosynthetics occurred at the edges of pile caps in both single-layer and double-layer GRPS embankments. However, double-layer GRPS embankments effectively mitigated the maximum tension in geosynthetics. (3) Double-layer GRPS embankments minimized soil arching formation within the embankment while enhancing membrane effects. (4) With increasing <i>η</i>, soil arching gradually formed between the two layers of geosynthetics. (5) Above a <i>η</i> threshold of 0.1, the maximum tension in the lower layer of geosynthetics significantly exceeded that in the upper layer.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 1","pages":"721 - 735"},"PeriodicalIF":2.8,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553840","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

Interaction characteristics between rock burst risk region and neighboring fractural plane: a numerical investigation based on moment tensor inversion and Kmeans++ clustering 基于矩张量反演和kmeans++聚类的岩爆危险区与邻近裂缝面相互作用特征数值研究

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2024-09-24 DOI: 10.1007/s40571-024-00825-9

Yusong Zhao, Chencheng Lin, Anna Ni, Binglei Li, Congcong Chen

{"title":"Interaction characteristics between rock burst risk region and neighboring fractural plane: a numerical investigation based on moment tensor inversion and Kmeans++ clustering","authors":"Yusong Zhao, Chencheng Lin, Anna Ni, Binglei Li, Congcong Chen","doi":"10.1007/s40571-024-00825-9","DOIUrl":"10.1007/s40571-024-00825-9","url":null,"abstract":"<div><p>Traditional rock burst always forms the V-shaped groove in tunnel sidewall, and the interaction characteristics and mechanisms between the original fractural plane and potential V-shaped failure region are not yet clear. We thus carried out the numerical investigation through PFC2D software to explore the interaction features between the above objects. Three sets of post-processing analyses are applied, the moment tensor inversion helps to reveal the quantitative intensity and specific patterns of secondary damage, the events cluster analysis through the Kmeans++ clustering method calibrates the development process of spalling failure at different positions, and the principal stress estimation can predict the extent and maximum depth of the V-shaped groove. Numerical simulations proved that the fractural plane cannot affect the failure process of the intact surrounding rock in left sidewall, and the fractural plane leads to the early appearance of secondary failures in the right sidewall; as the fractural plane moves outward, the size of V-shaped failure region and the dominant mode of secondary failures gradually change; when the fractural plane is outside the potential V-shaped failure zone, the local failure (caused by fractural plane) and spalling failure (started at tunnel free surface) exhibit independent development during majority period of the test.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 2","pages":"841 - 866"},"PeriodicalIF":2.8,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143919249","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 and numerical studies of rock-like specimens with different hole shapes under compressive-shear loading 压剪荷载作用下不同孔形岩石试件的试验与数值研究

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2024-09-24 DOI: 10.1007/s40571-024-00838-4

Qibin Lin, Shenchen Zhang, Huijuan Deng, Zuliang Shao, He Liu, Ming Lan

{"title":"Experimental and numerical studies of rock-like specimens with different hole shapes under compressive-shear loading","authors":"Qibin Lin, Shenchen Zhang, Huijuan Deng, Zuliang Shao, He Liu, Ming Lan","doi":"10.1007/s40571-024-00838-4","DOIUrl":"10.1007/s40571-024-00838-4","url":null,"abstract":"<div><p>This paper investigates the influence of five hole shapes (ellipse, circle, trapezoid, inverted-U, and square) on the mechanical behavior and crack process of rock-like materials under compressive-shear loading. The study employs both laboratory experiments and discrete element method modeling. The results show that the presence and shape of holes significantly reduce load-bearing capacity of rock samples, particularly square holes with sharp corners, which can lead to crack propagation due to stress concentration. The progression of surface deformation, as captured by digital image correlation technology, provides additional insights into the nucleation and propagation of cracks. The numerical simulations show that elliptical hole samples exhibit the highest crack initiation load, while square hole samples exhibit the lowest. The ratio of crack initiation load to peak load remains constant for different hole shapes, ranging from 0.5 to 0.6. The findings of this study provide theoretical insight and practical evidence for rock engineering design and construction in compressive-shear environments.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 2","pages":"889 - 905"},"PeriodicalIF":2.8,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143919248","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

Discrete element method simulation of high-speed vehicle collisions with road barrier systems 离散元法模拟高速车辆与路障系统的碰撞

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2024-09-24 DOI: 10.1007/s40571-024-00833-9

Abinet K. Habtemariam, Luis Brunnabend, Kai Fischer, Alexander Stolz

{"title":"Discrete element method simulation of high-speed vehicle collisions with road barrier systems","authors":"Abinet K. Habtemariam, Luis Brunnabend, Kai Fischer, Alexander Stolz","doi":"10.1007/s40571-024-00833-9","DOIUrl":"10.1007/s40571-024-00833-9","url":null,"abstract":"<div><p>The behavior of road or perimeter protection barriers under vehicle impact are usually investigated based on crash tests and finite element (FE) numerical approaches, which are ether expensive or time-consuming. Several studies have proposed to reduce the computation time of the numerical analysis by substituting the complex FE models of vehicles using simplified mass–spring–damper system models. However, these models have drawbacks since consideration of different vehicle impact angles is difficult and they are unable to correctly simulate the risk of high-speed vehicle collision running over the barrier. In this paper, a new approach is proposed to simulate the collision of vehicles with barriers based on the discrete element method (DEM). Here, to save computation time only a handful of 3D non-spherical particles are used to represent the barrier and vehicle. These particles are generated based on the super-quadric function, which is capable of generating a variety of shapes needed for the model. The contact detection and evaluation are carried out based on discrete function representation of the particles with uniform sampling. The bond between two discrete elements is defined using a nonlinear cohesive beam model since the distance between the elements is relatively large. The simulation results obtained based on this approach are more accurate and complete than the simplified mass–spring models and computationally more efficient than the FE model.\u0000</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 1","pages":"709 - 720"},"PeriodicalIF":2.8,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40571-024-00833-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553835","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

DEM simulation on the AE characteristics and mechanical behaviour of soft-hard composite rock-like materials with parallel fissures subjected to uniaxial compression 含平行裂隙的软硬复合岩石材料单轴压缩声发射特征及力学行为的DEM模拟

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2024-09-23 DOI: 10.1007/s40571-024-00831-x

Xinyang Luo, Xinrong Liu, Hang Lin, Su Li, Lojain Suliman

{"title":"DEM simulation on the AE characteristics and mechanical behaviour of soft-hard composite rock-like materials with parallel fissures subjected to uniaxial compression","authors":"Xinyang Luo, Xinrong Liu, Hang Lin, Su Li, Lojain Suliman","doi":"10.1007/s40571-024-00831-x","DOIUrl":"10.1007/s40571-024-00831-x","url":null,"abstract":"<div><p>The mechanical behaviour of the multi fractured soft-hard composite rock mass is not clear, which may bring certain difficulties to engineering management. Understanding the crack behaviour and acoustic emission characteristics of the fractured soft-hard composite rock mass will provide some help for engineering practice. In this paper, DEM simulation was used to study the influence of the fissure dip angle (<i>α</i>) and the rock bridge dip angle (<i>β</i>) on the acoustic emission characteristics, crack behaviour, displacement field, and stress field evolution of the soft-hard composite rock mass with three parallel fissures. The results show that the peak stress and elastic modulus of S group are always smaller than that of H group. As <i>α</i> increases, the ratio of shear AE events both before and after the peak gradually increases. Samples with larger <i>α</i> exhibit more intense acoustic emission activity. The <i>b </i>value of the S group is always lower than those of the H group. The <i>b</i> value of both samples groups increases and then decreases with the increase of <i>α</i>, reaching the minimum value when <i>α</i> is 45°. The <i>b </i>value of the H group fluctuates in an S-shape as <i>β</i> increases. In contrast, the <i>b </i>value of the S group first increases and then decreases with the increase of <i>β</i>, peaking at 90° for <i>β</i>. Due to the limitations on the direction and magnitude of particle displacement, there are differences in the types of rock bridge cracks in the S and H group samples. Larger <i>α</i> and <i>β</i> tend to mitigate the concentration of tensile stress, leading to an expanded area of tensile stress coverage. The S group samples are more sensitive to this mitigating effect.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 2","pages":"867 - 887"},"PeriodicalIF":2.8,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143919018","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

Delay failure and fast fracturing of notched bedding rock under shear test condition: physical test and discrete element simulation 剪切试验条件下缺口层理岩的延迟破坏与快速破裂：物理试验与离散元模拟

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2024-09-23 DOI: 10.1007/s40571-024-00830-y

Seyed Davoud Mohammadi, Rahim Mortezaei, Vahab Sarfarazi, Parastou Salehipor

{"title":"Delay failure and fast fracturing of notched bedding rock under shear test condition: physical test and discrete element simulation","authors":"Seyed Davoud Mohammadi, Rahim Mortezaei, Vahab Sarfarazi, Parastou Salehipor","doi":"10.1007/s40571-024-00830-y","DOIUrl":"10.1007/s40571-024-00830-y","url":null,"abstract":"<div><p>This research investigates the impact of the brittleness of bedding, bedding angel, and the notch length on the delayed failure and rapid fracturing of notched bedding rock under shear conditions subjected to punch tests. Also, this paper analyzed the acoustic emission events throughout the entire process of rock bridge failure. For this purpose, rectangular two layered samples containing both hard- and soft-rock layers were employed. Each model included two vertical edge notches in a single direction, with notch lengths of 20, 40, and 60 mm. The bedding layers were varied from 90° to − 75° with increments of 15°. The results demonstrate that smooth cracks originated from the notch tip and propagated vertically until coalescing with the upper boundary of the model. The occurrence of acoustic emission in hard, ductile gypsum is considerably greater than that in soft, brittle gypsum. The shear stiffness of bedded rock is maximized when a higher percentage of shear surfaces is occupied by hard and ductile gypsum. Delay failure occurs in the hard, ductile layer, while fast fracturing occurs in the soft, brittle layer. In models with constant notch length, delay failure was occurred in models with a positive layer, whereas fast fracturing was observed in models with a negative layer angle. Additionally, delay failure changes to fast fracturing with an increase in the notch length. Failure patterns, shear stiffness, and shear strengths of the notched bedding models are similar to those of notched physical samples.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 1","pages":"673 - 691"},"PeriodicalIF":2.8,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553770","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