Computers and Geotechnics最新文献_第9页

Coupled vibratory roller and layered unsaturated subgrade model for intelligent compaction 用于智能压实的振动压路机和分层非饱和路基耦合模型

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-10-10 DOI: 10.1016/j.compgeo.2024.106827

Chuxuan Tang , Zheng Lu , Lang Qin , Tingzhou Yan , Jian Li , Yang Zhao , Yu Qiu

{"title":"Coupled vibratory roller and layered unsaturated subgrade model for intelligent compaction","authors":"Chuxuan Tang , Zheng Lu , Lang Qin , Tingzhou Yan , Jian Li , Yang Zhao , Yu Qiu","doi":"10.1016/j.compgeo.2024.106827","DOIUrl":"10.1016/j.compgeo.2024.106827","url":null,"abstract":"<div><div>To provide theoretical guidance for intelligent compaction, this study proposes an efficient analytical model that considers the coupled dynamic interaction between a vibratory roller and a layered subgrade. The vibratory roller is simulated using a lumped parameter model, while the subgrade is characterized as a layered unsaturated poroelastic medium. The governing equations are solved using the double Fourier transform to derive the steady-state solution of this fully coupled model. The correctness of the proposed model is verified by comparing it with published analytical results and field test results. Results indicate that the vertical acceleration response of the roller drum is sensitive to variations in subgrade modulus. However, when evaluating the modulus of the current filling layer, it is crucial to consider the effects of the underlying layer on the acceleration response of the roller drum, especially when the existing subgrade thickness is less than 2 m. The influence of excitation frequency on the sensitivity of vertical acceleration response is found to be significant. For subgrade quality assessment with existing subgrade thickness less than 2 m, a low-frequency excitation load is recommended to maximize sensitivity, while both low and high excitation frequencies can be employed for thicker existing subgrades.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106827"},"PeriodicalIF":5.3,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421141","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 unified soil reaction model for laterally loaded monopiles in soft and stiff clays 软粘土和硬粘土中横向加载单桩的统一土壤反力模型

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-10-09 DOI: 10.1016/j.compgeo.2024.106819

Xiuyang Zhang , Degao Zou , Jingmao Liu , Kai Chen , Fanwei Ning , Tianju Wang

{"title":"A unified soil reaction model for laterally loaded monopiles in soft and stiff clays","authors":"Xiuyang Zhang , Degao Zou , Jingmao Liu , Kai Chen , Fanwei Ning , Tianju Wang","doi":"10.1016/j.compgeo.2024.106819","DOIUrl":"10.1016/j.compgeo.2024.106819","url":null,"abstract":"<div><div>To develop a unified soil reaction model suitable for laterally loaded monopiles in soft and stiff clays, this paper employs an experimentally validated numerical method to analyze the influence of diameter, embedded length (<em>L</em>), and clay types (soft or stiff) on the soil reaction model, proposing a unified model based on hyperbolic soil reaction curve. This model fully considers the contributions of distributed lateral load, base moment, base shear force, and distributed moment to the lateral resistance. The results of the analysis indicate that the ultimate normalized lateral soil resistance (<span><math><mrow><msub><mover><mrow><mi>p</mi></mrow><mrow><mo>¯</mo></mrow></mover><mi>u</mi></msub></mrow></math></span>) of soft and stiff clays in the wedge flow zone increases with depth, reaching a peak in the full flow zone with the peak points located around 0.5 <em>L</em>. The maximum of <span><math><mrow><msub><mover><mrow><mi>p</mi></mrow><mrow><mo>¯</mo></mrow></mover><mi>u</mi></msub></mrow></math></span> between soft and stiff clays is positively correlated with the ratio of effective vertical stress to undrained shear strength (<span><math><mrow><msubsup><mi>σ</mi><mrow><mtext>v</mtext></mrow><mo>′</mo></msubsup><mo>/</mo><msub><mi>s</mi><mi>u</mi></msub></mrow></math></span>) at the current depth. The ultimate base shear force and base moment for monopiles in soft and stiff clays can also be represented by <span><math><mrow><msubsup><mi>σ</mi><mrow><mtext>v</mtext></mrow><mo>′</mo></msubsup><mo>/</mo><msub><mi>s</mi><mi>u</mi></msub></mrow></math></span> at the base. Through rigorous validation with centrifuge and field tests, the unified soil reaction model proposed in this paper can accurately predict the response of monopiles in soft and stiff clays.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106819"},"PeriodicalIF":5.3,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421121","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

Compaction quality assessment of road subgrades using explainable deep graph learning framework 利用可解释深度图学习框架评估路基压实质量

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-10-09 DOI: 10.1016/j.compgeo.2024.106795

Feng Jia, Jie Zhang, Jianjun Shen, Liangfan Wu, Sinuo Ma

{"title":"Compaction quality assessment of road subgrades using explainable deep graph learning framework","authors":"Feng Jia, Jie Zhang, Jianjun Shen, Liangfan Wu, Sinuo Ma","doi":"10.1016/j.compgeo.2024.106795","DOIUrl":"10.1016/j.compgeo.2024.106795","url":null,"abstract":"<div><div>Compaction-quality assessment based on machine learning is an attractive topic in road construction research. However, existing methods do not consider the structural information of data when predicting the compaction degree. Thus, an explainable deep graph learning framework is proposed for the intelligent compaction quality assessment of road subgrades. In this method, a multi-domain analysis is first used to extract different indicators from the vibration signals of a vibratory roller. Second, the indicators for the different sampling points are constructed as graph structure data. Finally, an alternating graph-regularized regression network (AGRN) is developed to learn features from the graph data and aggregate the features using a regressor to predict the compaction degree. Through experimental verification, the proposed method displays an improved generalization ability and a high prediction accuracy when compared with other methods. Moreover, Shapley additive explanations (SHAP) are introduced to measure the marginal contributions of indicators for predicting the compaction degree in compaction quality assessments.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"176 ","pages":"Article 106795"},"PeriodicalIF":5.3,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142420502","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

Spatially mixed implicit–explicit schemes in hydro-mechanically coupled soil dynamics 水力机械耦合土壤动力学中的空间混合隐式-显式方案

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-10-09 DOI: 10.1016/j.compgeo.2024.106811

Patrick Staubach , Jan Machaček

引用次数: 0

CFD-DEM modeling of seepage in foam-conditioned soil 泡沫调节土壤中的 CFD-DEM 渗流模型

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-10-09 DOI: 10.1016/j.compgeo.2024.106818

Rongkai Zeng , Shuying Wang , Yang Zhang , Tongming Qu

{"title":"CFD-DEM modeling of seepage in foam-conditioned soil","authors":"Rongkai Zeng , Shuying Wang , Yang Zhang , Tongming Qu","doi":"10.1016/j.compgeo.2024.106818","DOIUrl":"10.1016/j.compgeo.2024.106818","url":null,"abstract":"<div><div>Soil conditioning with foam agents can reduce the permeability of virgin soils and mitigate the risk of uncontrollable mud gushing during the excavation of Earth Pressure Balanced (EPB) shield machines. This study employs a combined Computational Fluid Dynamics (CFD) − Discrete Element Method model (DEM) method to simulate the seepage process in foam-conditioned excavated soil. Through discovering migration patterns of foam particles and their effects on macroscopic permeability under various hydraulic gradients, this study unveils the micro-mechanisms governing the permeability of foam-modified soil. Results indicate the feasibility of using hydraulic gradient amplification to examine foam particle migration channels and permeability changes. Furthermore, the findings show that the initial stabilization period in the seepage experiment arises from a dynamic equilibrium between the inflow and outflow of foam in the lower layers. In the upper and middle soil layers, foam migration paths show resilience to water pressure during the initial stage of seepage, but become increasingly responsive to the pressure when migration is hindered. The migration paths of the foam particles in the lower layers remain consistent across different water pressures. The migration speed of individual foam particles is determined by both water pressure and pore structure, while the overall migration speed of the foam increases as water pressure rises.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"177 ","pages":"Article 106818"},"PeriodicalIF":5.3,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421219","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

One-dimensional non-isothermal diffusion model for organic pollutant in an unsaturated composite liner considering the degradation effect 考虑降解效应的有机污染物在非饱和复合衬垫中的一维非等温扩散模型

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-10-09 DOI: 10.1016/j.compgeo.2024.106807

Wenhao Jiang , Shangqi Ge , Jiangshan Li

{"title":"One-dimensional non-isothermal diffusion model for organic pollutant in an unsaturated composite liner considering the degradation effect","authors":"Wenhao Jiang , Shangqi Ge , Jiangshan Li","doi":"10.1016/j.compgeo.2024.106807","DOIUrl":"10.1016/j.compgeo.2024.106807","url":null,"abstract":"<div><div>In this article, a one-dimensional non-isothermal diffusion model for organic pollutant in an unsaturated composite liner (comprising a geomembrane and an unsaturated compacted clay liner (CCL)) considering the degradation effect is established, which also includes the impacts of temperature on diffusion-related parameters, and employs a water content and pore-water pressure head relationship equation that better matches the experimental results. Subsequently, this model is addressed through a finite-difference technique, and its reasonableness is proved by comparing with the experiment measurements and two other calculation approaches. Following this, the analyses suggest that the diffusion coefficients’ change induced by a rising temperature accelerates the diffusion rate, whereas such an alteration on partitioning coefficients has an opposite effect. Furthermore, the evaluation reveals that the non-isothermal state caused by an increasing upper temperature overall lowers the anti-fouling performance. The unsaturated composite liner’s barrier function is weakened by an increment in residual water content of CCL, but enhanced by unsaturated layer thickness. It is also detected that the degradation effect should be considered if the degradation half-life ≤ 100 years. Lastly, a simplified approach for assessing the unsaturated composite liner’s barrier performance is presented, which can provide guidance for its engineering design in a non-isothermal scenario.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"176 ","pages":"Article 106807"},"PeriodicalIF":5.3,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142420501","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

APD: An automated parameter determination system based on in-situ tests APD：基于现场测试的自动参数确定系统

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-10-07 DOI: 10.1016/j.compgeo.2024.106799

Islam Marzouk , Ronald Brinkgreve , Arny Lengkeek , Franz Tschuchnigg

{"title":"APD: An automated parameter determination system based on in-situ tests","authors":"Islam Marzouk , Ronald Brinkgreve , Arny Lengkeek , Franz Tschuchnigg","doi":"10.1016/j.compgeo.2024.106799","DOIUrl":"10.1016/j.compgeo.2024.106799","url":null,"abstract":"<div><div>In-situ testing has numerous applications in geotechnical engineering. The interpretation of in-situ test results includes soil stratification and determination of soil parameters. This paper presents an automated parameter determination framework that aims to determine constitutive model parameters based on in-situ tests. The ongoing research project relies on a graph-based approach for determining the parameters. The framework has two main attributes: transparency and adaptability. Transparency is achieved by illustrating how a certain parameter was computed. Adaptability is ensured by allowing users to incorporate their expertise into the framework. The system currently determines parameters based on three main workflows that utilize the results of cone penetration tests, dilatometer tests, and shear wave velocity measurements. This study employs the three main workflows to determine soil parameters for one of the Norwegian GeoTest Sites. Additionally, the connection between the parameter determination system and finite element analysis is discussed, where the parameters for the Modified Cam Clay model are evaluated. The framework is valuable in the early stages of projects, providing detailed soil information when soil data is limited. Ongoing research aims to assess the accuracy of the derived soil and constitutive model parameters and to expand the system’s capabilities by including additional in-situ tests.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"176 ","pages":"Article 106799"},"PeriodicalIF":5.3,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142420500","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

Physics-guided neural network-based framework for 3D modeling of slope stability 基于物理引导神经网络的斜坡稳定性三维建模框架

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-10-05 DOI: 10.1016/j.compgeo.2024.106801

Zilong Zhang , Bowen Wang , Zhengwei Li , Xinyu Ye , Zhibin Sun , Daniel Dias

{"title":"Physics-guided neural network-based framework for 3D modeling of slope stability","authors":"Zilong Zhang , Bowen Wang , Zhengwei Li , Xinyu Ye , Zhibin Sun , Daniel Dias","doi":"10.1016/j.compgeo.2024.106801","DOIUrl":"10.1016/j.compgeo.2024.106801","url":null,"abstract":"<div><div>Physics-informed neural networks (PINN) have gradually attracted attention in the field of geotechnical engineering. This paper proposes a novel PINN-based framework for the three-dimensional (3D) stability analysis of soil slopes. Based on the fundamental theorem of plasticity and limit analysis, the partial differential equations (PDE) with regard to slope collapse are derived and integrated into the physics-guided loss function. A kinematically admissible failure mechanism that rigorously satisfies the Mohr-Coulomb associated flow rule is obtained by minimizing the loss function, thereby circumventing complex mathematical calculations. The discrete points generated by PINN are selected and refined through a series of procedures to represent the failure block of slopes using a two-dimensional matrix. The entire training process of the PINN-based framework is conducted without the need for any labeled data. The resulting discretized failure mechanism is meshfree and capable of accommodating spatially discrete data. A validation exercise is performed to verify the proposed framework by comparing it with the classical 3D rotational failure mechanism. To further consider the impact of external excitation on slope stability, a hybrid PINN framework is developed to assess the stability of slopes subjected to complex external environments. In addition to the PINN to generate a failure mechanism, a parallel PINN is employed to acquire the corresponding spatially discrete data of specified external excitations. The hybrid PINN framework for seismic stability assessment of slopes is demonstrated by way of example, indicating favorable feasibility and applicability of the developed approach. The proposed PINN-based framework provides innovative and promising avenues for 3D slope stability analysis.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"176 ","pages":"Article 106801"},"PeriodicalIF":5.3,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142420597","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 hybrid approach combining UD and GA-CV-SVM to evaluate shear performance in high asphalt concrete core 结合 UD 和 GA-CV-SVM 的混合方法评估高沥青混凝土芯材的剪切性能

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-10-05 DOI: 10.1016/j.compgeo.2024.106812

Yong Li , Yanlong Li , Lifeng Wen , Weimei Li , Ye Zhang , Peng Bu , Xinjian Sun

{"title":"A hybrid approach combining UD and GA-CV-SVM to evaluate shear performance in high asphalt concrete core","authors":"Yong Li , Yanlong Li , Lifeng Wen , Weimei Li , Ye Zhang , Peng Bu , Xinjian Sun","doi":"10.1016/j.compgeo.2024.106812","DOIUrl":"10.1016/j.compgeo.2024.106812","url":null,"abstract":"<div><div>The shear effect on high asphalt concrete core is significant. However, studies on the reliability of 100-meter-scale cores against shear damage remain limited. A key challenge in this research field is establishing the control criteria for the core and improving the computational efficiency of implicit limit state function (LSF). Additionally, the impact of material parameter uncertainty on the shear failure reliability of the core during the dam construction and impoundment stages remains unclear. To address this, a safety evaluation method based on time discretization was proposed, combining uniform design (UD), K-fold cross-validation (K-CV), and genetic algorithm (GA) to optimize the support vector machines (SVM). The core parameters of 52 asphalt concrete-core rockfill dams (ACCRDs) were analyzed, with the statistical values of the basic variables considered in determining the reliability index. The theoretical derivation of the critical shear failure safety index established a stability formula to assess the safety state of the dam core. The significance parameters were identified, and the sample points were generated at each stage using UD, and the Support Vector Regression (SVR) was applied to reconstruct the LSF, and reliability was calculated through the checking point method.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"176 ","pages":"Article 106812"},"PeriodicalIF":5.3,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142420498","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

An efficient nonlocal integral method based on the octree algorithm 基于八叉树算法的高效非局部积分法

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2024-10-05 DOI: 10.1016/j.compgeo.2024.106796

Dechun Lu , Yaning Zhang , Xin Zhou , Fanping Meng , Cancan Su , Xiuli Du

{"title":"An efficient nonlocal integral method based on the octree algorithm","authors":"Dechun Lu , Yaning Zhang , Xin Zhou , Fanping Meng , Cancan Su , Xiuli Du","doi":"10.1016/j.compgeo.2024.106796","DOIUrl":"10.1016/j.compgeo.2024.106796","url":null,"abstract":"<div><div>The nonlocal integral method typically requires a very high computing cost to search neighborhood integration points for calculating the nonlocal variable, which limits its application in large-scale problems. This paper proposes an efficient nonlocal integral method based on the octree algorithm, in which the integration point information is stored in the tree data structure to accelerate the search task. Firstly, the fundamental principles and implementation details of using the octree algorithm to search neighborhood integration points are described in detail. Subsequently, a Mohr-Coulomb nonlocal damage plastic model is presented as the application object of the proposed method. The model is implemented further in the ABAQUS using the octree-based nonlocal method and the return mapping algorithm enhanced by a line search method. Finally, two typical boundary value problems are simulated to verify the effectiveness and to assess the computational efficiency of the proposed nonlocal method. For the given test environment, the octree algorithm can achieve up to 100 times speedup at the integration point level compared to the traversal algorithm, and the developed efficient nonlocal method can achieve up to 7.9 times speedup at the boundary value problem level compared to the original nonlocal method.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"176 ","pages":"Article 106796"},"PeriodicalIF":5.3,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142420503","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