Computers and Geotechnics最新文献

A viscoelastic wave propagation approach for dynamic backcalculation of layer properties of asphalt pavements under an impact load 用于动态反算冲击荷载下沥青路面层特性的粘弹性波传播方法

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-09-16 DOI: 10.1016/j.compgeo.2024.106752

{"title":"A viscoelastic wave propagation approach for dynamic backcalculation of layer properties of asphalt pavements under an impact load","authors":"","doi":"10.1016/j.compgeo.2024.106752","DOIUrl":"10.1016/j.compgeo.2024.106752","url":null,"abstract":"<div><p>An accurate and efficient asphalt pavement analytical model is crucial in back-calculating reasonable layer properties from falling weight deflectometer data. This study employs the wave propagation approach to address the cylindrical axisymmetric problem for asphalt pavement under an impact load. Different from traditional spectral element method (SEM), continuous integral transforms (Laplace-Hankel transforms) are used to achieve the response solutions for viscoelastic layered media. The modified Havriliak-Negami (MHN) model is incorporated to characterize the viscoelastic properties of asphalt concrete (AC) layer. The MHN model requires only five coefficients to derive various viscoelastic quantities and provides significant advantages in parameter identification. The proposed procedure is validated against response results from finite element method and SEM with a difference of less than 2%, and particularly, it prevents frequency leakage errors that may occur in SEM caused by discrete Fourier transform. A dynamic backcalculation program is then developed by combining the proposed procedure with a screened optimization algorithm. The difference between actual and backcalculated layer parameters of theoretical pavements is found to be less than 3%. Field measured data are also back-analysed, and both dynamic modulus and phase angle master curves are determined to describe the viscoelastic behaviour of AC layer.</p></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142233615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Seismic resilience assessment of sheet-pile wharves in liquefiable soils using different liquefaction countermeasures 采用不同液化对策对可液化土壤中的钢板桩码头进行抗震评估

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-09-14 DOI: 10.1016/j.compgeo.2024.106750

{"title":"Seismic resilience assessment of sheet-pile wharves in liquefiable soils using different liquefaction countermeasures","authors":"","doi":"10.1016/j.compgeo.2024.106750","DOIUrl":"10.1016/j.compgeo.2024.106750","url":null,"abstract":"<div><p>Seismic resilience assessment is essential for maintaining the functionality of sheet-pile wharves in liquefiable soils, preventing significant damages and minimizing losses during earthquakes. This study delves into the seismic resilience of sheet-pile wharves, focusing specifically on the effectiveness of four different liquefaction countermeasure techniques: anchor lengths, cement deep mixing, stone columns, and soil compaction. As such, an advanced two-dimensional (2D) Finite Element (FE) computational framework is established, motivated by a typical large-scale sheet-pile wharf configuration. Within this framework, a recently developed multi-yield surfaces plasticity model is employed, with the modeling parameters calibrated through undrained stress-controlled cyclic triaxial tests and a centrifuge test. Subsequently, the impacts of these liquefaction countermeasures on the seismic resilience of the sheet-pile wharves are systematically investigated. Additionally, the effectiveness of combining longer anchor lengths with the other three mitigation techniques to enhance the seismic resilience of the sheet-pile wharves are examined. It is demonstrated that the synergistic effects of different liquefaction countermeasures can further reduce the liquefaction potential, thereby improving the seismic resilience. Overall, the FE analysis technique and the resulting insights are highly significant for the seismic resilience assessment of equivalent sheet-pile wharves in liquefiable soils, particularly when implementing such liquefaction mitigation countermeasures.</p></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142228780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Formation mechanisms of different kinds of blast-induced cracks and their extension characteristics in rock mass 岩体中不同类型爆破诱发裂缝的形成机理及其扩展特征

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-09-13 DOI: 10.1016/j.compgeo.2024.106747

{"title":"Formation mechanisms of different kinds of blast-induced cracks and their extension characteristics in rock mass","authors":"","doi":"10.1016/j.compgeo.2024.106747","DOIUrl":"10.1016/j.compgeo.2024.106747","url":null,"abstract":"<div><p>Different kinds of cracks, including radial cracks, circumferential cracks, and spalling cracks, are formed in rock blasting. Understanding the extension characteristics of these cracks is essential for improving rock fragmentation results. However, few publications have comprehensively focused on various blast-induced cracks, and their formation mechanisms and extension characteristics are still unclear. In this study, the formation mechanisms of different kinds of blast-induced cracks are theoretically analyzed from the viewpoint of inner and outer blasting effects. Numerical models are subsequently developed to study the extension characteristics of different kinds of blast-induced cracks. Finally, based on the tunnel blasting excavation, the extension of cracks induced by cutting and surrounding blastholes is numerically simulated. The results show that rock blasting can be classified into inner and outer blasting effects. Under the inner blasting effect, radial cracks are formed in various stress states, with circumferential cracks occurring specifically in the tensile-tensile state. Under the outer blasting effect, spalling cracks form around the free surface of rock mass. In brittle rocks subjected to blast loading with higher peak values, circumferential cracks occur more frequently. In practice, it is advisable to improve rock fragmentation results by adjusting the formation of different kinds of blast-induced cracks.</p></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142228886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

A phase field model with modified volumetric-deviatoric decomposition for the mixed-mode fracture of rock 岩石混合模式断裂的相场模型与修正的体积-偏差分解法

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-09-13 DOI: 10.1016/j.compgeo.2024.106738

{"title":"A phase field model with modified volumetric-deviatoric decomposition for the mixed-mode fracture of rock","authors":"","doi":"10.1016/j.compgeo.2024.106738","DOIUrl":"10.1016/j.compgeo.2024.106738","url":null,"abstract":"<div><p>Recent attempts of phase field models to simulate rock fracture problems have been regarded as fruitful, owing to their powerful crack characterization capability. However, existing phase field models still exhibit limitations in simulating quasi-coplanar shear cracks and related coalescence patterns that often occur in rock failure. In this study, we propose a novel phase field model to simulate the mixed-mode fracture, in which a modified volumetric-deviatoric decomposition that combines the advantages of the volumetric-deviatoric decomposition and the spectral decomposition is conducted to distinguish between tensile, tensile-shear, and compressive-shear fractures; to reduce unrealistic damage in the area outside the crack trajectory, a threshold parameter is introduced into the degradation function to control whether the related energy participates in damage evolution; and the hybrid formulation is employed to efficiently and robustly solve the displacement and phase fields alternately. The feasibility of the proposed phase field model is first validated by a benchmark example. Next, the application of this model to the simulations of different rock specimens under uniaxial compression reveals a better agreement with experimental observations than previous simulation results, demonstrating an advancement over existing phase field models.</p></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142173440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Modeling obliquely incident seismic wave propagation in rocks via the FDM-DEM coupling scheme: Algorithms and applications 通过 FDM-DEM 耦合方案模拟斜入射地震波在岩石中的传播：算法与应用

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-09-13 DOI: 10.1016/j.compgeo.2024.106745

{"title":"Modeling obliquely incident seismic wave propagation in rocks via the FDM-DEM coupling scheme: Algorithms and applications","authors":"","doi":"10.1016/j.compgeo.2024.106745","DOIUrl":"10.1016/j.compgeo.2024.106745","url":null,"abstract":"<div><p>The incidence angle of seismic waves plays a pivotal role in the stability analysis of structures in near-field zones. Despite its importance, the application of obliquely incident seismic waves within models of discontinuous media has been limited. This study introduces a novel approach that integrates the oblique incidence of seismic waves into a coupled model employing both the Finite Difference Method (FDM) and the Discrete Element Method (DEM). We validate the accuracy of seismic wave propagation under oblique incidence in two FDM-DEM coupling models—overlapping coupling and interface coupling—through comparisons with theoretical solutions. For vertically incident seismic P-waves, both models yield similar results. However, under oblique incidence, the overlapping coupling model demonstrates superior accuracy, with a maximum error of approximately 4.217 %, compared to about 10 % in the interface coupling model. Our findings also show that while the relative sizes of particle diameter and overlap length minimally affect accuracy, the arrangement of particles markedly influences the results. Furthermore, we apply this method to a slope model to investigate the failure process, revealing that the nature of the sliding body shifts from tensile sliding to tensile ejection as the incidence angle increases.</p></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142228885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 role of interface force on the deformation compatibility of fiber optic cable and soil: Perspective from 3D discrete element numerical simulation 界面力对光缆与土壤变形相容性的影响：三维离散元数值模拟的视角

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-09-13 DOI: 10.1016/j.compgeo.2024.106723

{"title":"The role of interface force on the deformation compatibility of fiber optic cable and soil: Perspective from 3D discrete element numerical simulation","authors":"","doi":"10.1016/j.compgeo.2024.106723","DOIUrl":"10.1016/j.compgeo.2024.106723","url":null,"abstract":"<div><p>In the application of distributed fiber optic sensing technology to obtain soil deformation, the deformation coordination between the sensing fiber optic (FO) cable and the soil medium is crucial. In this study, a three-dimensional numerical model for pullout test of a sensing cable in sand was constructed utilizing the discrete element method. The results indicate that, with the continuous increase in pullout displacement, the interface forces between the FO cable and soil particles steadily rise. After complete interface failure, these forces rapidly decrease. Throughout the pullout process along the distribution of the FO cable, the magnitude of interface forces undergoes significant changes depending on the contact state of the interface. As the confining pressure increases 0 MPa to 0.4 MPa, the effective contact between the FO cable and soil particles increases by approximately 0.4 times. The micro-anchors installed on the FO cable can generate anchoring forces. The anchoring forces initiate only after interface failure at their respective locations, restricting the development of strain at subsequent positions. We suggest defining the critical strain value, which corresponds to the maximum interface forces during the pullout process, and provides a basis for determining the interface strength between the FO cable and the soil.</p></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142228778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Numerical framework for coupling SPH with image-based DEM for irregular particles 将不规则颗粒的 SPH 与基于图像的 DEM 相结合的数值框架

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-09-13 DOI: 10.1016/j.compgeo.2024.106751

{"title":"Numerical framework for coupling SPH with image-based DEM for irregular particles","authors":"","doi":"10.1016/j.compgeo.2024.106751","DOIUrl":"10.1016/j.compgeo.2024.106751","url":null,"abstract":"<div><p>Understanding fluid-particle interactions is crucial due to their occurrence in both natural phenomena and engineering applications, but accurately capturing these interactions presents considerable challenges. The complexity escalates when accounting for the natural shape of particles, prompting the development of numerical solutions to address these complexities. Here, we propose a numerical framework that combines Smoothed Particle Hydrodynamics (SPH) with the Imaged-based Discrete Element Method (iDEM) to model the fluid and particle components, respectively, while considering the actual shape of particles. Initially, we validated our approach by simulating sphere and cube water entry cases, confirming the method’s accuracy. Later, we applied the coupling scheme to a more complex scenario of a dam break, involving irregular and cubic grains of equivalent mass and volume. Our results demonstrate the effectiveness of the proposed scheme in capturing the actual shape of grains and elucidate the influence of particle shape on various fluid parameters. We found that fluid movement is facilitated more in cubic packs due to reduced interlocking and increased surface area, resulting in higher fluid and particle velocities and enhanced displacement in cube-shaped grains. These findings deepen our understanding of fluid-particle interactions in complex systems and the significance of particle shape in such analyses.</p></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0266352X24006906/pdfft?md5=e68e956e6ba6734ec6c08287ae6f4930&pid=1-s2.0-S0266352X24006906-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142228779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 evaluation of the mobilization of mechanisms governing the geogrid-aggregate interaction 对土工格栅--集料相互作用机制动员的 DEM 评估

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-09-12 DOI: 10.1016/j.compgeo.2024.106742

{"title":"DEM evaluation of the mobilization of mechanisms governing the geogrid-aggregate interaction","authors":"","doi":"10.1016/j.compgeo.2024.106742","DOIUrl":"10.1016/j.compgeo.2024.106742","url":null,"abstract":"<div><p>Pullout tests of geogrids embedded in a single clean aggregate type were conducted and subsequently simulated to investigate the geogrid-aggregate interaction mechanisms. The Discrete Element Method (DEM) model, which was carefully calibrated and validated against the experimental results, was adopted for the simulations. The three-dimensional deformation behavior of geogrids and the shear behavior of aggregates with complex particle shapes were successfully predicted. Analysis of the particle displacement distribution and contact force distribution allowed determination of the particle-scale interaction mechanisms of the geogrid-aggregate system. In particular, the mobilization of pullout resistance components was tracked based on the contact identification method and the influence of geogrid stiffness on the mobilization of pullout resistance components could be evaluated. The results indicate that the activation of the different geogrid resistance components that develop during pullout are not synchronized. During the pullout process, DEM predictions indicate that the frictional resistance of the geogrid is activated first, peaking rapidly and being followed by the development of passive resistance of the transverse ribs. Also, an increased geogrid stiffness was found to enhance the passive resistance of the transverse ribs but to influence only negligibly the frictional resistance.</p></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142173437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Investigation of nonlinear flow in discrete fracture networks during shear based on XFEM method 基于 XFEM 方法的离散断裂网络剪切过程中的非线性流动研究

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-09-12 DOI: 10.1016/j.compgeo.2024.106744

{"title":"Investigation of nonlinear flow in discrete fracture networks during shear based on XFEM method","authors":"","doi":"10.1016/j.compgeo.2024.106744","DOIUrl":"10.1016/j.compgeo.2024.106744","url":null,"abstract":"<div><p>To characterize fractured rock masses, self-developed programs are utilized to generate fracture networks. A nonlinear flow model considering the shear dilatancy effect is established, and a numerical solution method for modelling nonlinear flow in fractured rock masses during shear is proposed on the basis of extended finite element analysis. The contour plots reveal distinct patterns in the water pressure and flow distributions within fractures. The reduction in the lateral pressure coefficient and increase in the shear stiffness of the joints facilitate a more homogeneous distribution of the water pressure gradient. Under the same vertical stress, increasing the lateral pressure coefficient or decreasing the shear stiffness leads to a more pronounced shear dilatancy effect on fractures. Consequently, an increase in fracture aperture and permeability occurs, and the flow of the fractured rock mass is enhanced. With the same vertical stress, an increase in horizontal stress and a decrease in shear stiffness lead to a gradual reduction in the linear and nonlinear coefficients of Forchheimer’s law. Specifically, the influence of the lateral pressure coefficient on the linear coefficient is greater than that on the nonlinear coefficient.</p></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142173439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Gravity effects on a bio-inspired self-burrowing probe in granular soils 重力对生物启发的粒状土壤自生长探针的影响

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-09-12 DOI: 10.1016/j.compgeo.2024.106748

{"title":"Gravity effects on a bio-inspired self-burrowing probe in granular soils","authors":"","doi":"10.1016/j.compgeo.2024.106748","DOIUrl":"10.1016/j.compgeo.2024.106748","url":null,"abstract":"<div><p>In recent years, self-burrowing probes have been studied since they can be suitable for soil monitoring in locations with limited access such as outer space bodies and underneath existing structures. We study the performance of a self-burrowing probe under different gravity conditions, from low gravity (i.e., 1/6<em>g</em>, 1/3<em>g</em> and 1<em>g</em>) to high gravity (i.e., 5<em>g</em>, 10<em>g</em> and 15<em>g</em>), specifically in terms of penetration distance and energy consumption. Results show that the probe reaches efficient penetration in all gravity conditions and that it achieves larger penetration distances in high gravity conditions. However, the penetration efficiency, shown as unit energy per meter, is higher in low gravity. Additionally, we prove that a simple dimensional analysis provides reasonable scaling factors for first order effects in forces, velocities and energy. The findings in this study give confidence to the potential use of self-burrowing probes in campaigns of soil testing and sensor deployment in outer space or centrifuges in which the gravity conditions can differ from Earth.</p></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":null,"pages":null},"PeriodicalIF":5.3,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0266352X24006876/pdfft?md5=8ff66205a35f8dec2edb744aaa7c0552&pid=1-s2.0-S0266352X24006876-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142173438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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