International Journal for Numerical and Analytical Methods in Geomechanics最新文献

An Analysis of Soil–Pipe Interaction in Sand by Photoelastic Approach and an Analytical Approximation

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-03-30 DOI: 10.1002/nag.3977

Gökhan Cevikbilen, Tugba Kuru, Akif Kutlu, Osman Bulut

{"title":"An Analysis of Soil–Pipe Interaction in Sand by Photoelastic Approach and an Analytical Approximation","authors":"Gökhan Cevikbilen, Tugba Kuru, Akif Kutlu, Osman Bulut","doi":"10.1002/nag.3977","DOIUrl":"https://doi.org/10.1002/nag.3977","url":null,"abstract":"In‐situ stress condition is an important aspect of buried unpressurized pipelines. Empirical approaches used for preliminary design are usually based on observations, which may be associated with some errors related to the measurement method. The photoelastic approach represents an alternative, nonintrusive measurement technique to model the plane stress‐strain behavior of buried pipes under different surcharge and groundwater conditions. Based on this approach, two model tests M1 and M2 were conducted to demonstrate the effects of soil arching on a pipe model buried in river sand and manufactured sand, which have similar granulometry but different angularity. In the dry state, the higher arching effect between the round particles of the river sand leads to a lower settlement and a smaller change in the stress and diameter of the pipe in M1 compared to M2. The finite element analysis confirms the experimental results quite well, while Iowa formula is sufficient to represent the diameter changes. However, after a loading and unloading cycle, M1 shows larger settlements at saturation due to the loss of arching effect in contrast to M2. The redistribution of the round particles and the re‐arching in a denser state lead to a huge stress relief in the pipe of M1, while the interlocked angular particles prevent the diameter changes, so that the stresses observed in the pipe are mainly maintained in M2 at unloading and saturation. Finally, a practical analytical model to determine the pipe deformation for the dry condition problem is proposed.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"216 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143736563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 Deformation Characteristics and Failure Mechanism of Gas Extraction Hole Considering Strain Softening

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-03-29 DOI: 10.1002/nag.3975

Xiaochuan Wang, Wei Wang, Zhaolong Ge, Man Wang, Chaoyu Xu

{"title":"Study on Deformation Characteristics and Failure Mechanism of Gas Extraction Hole Considering Strain Softening","authors":"Xiaochuan Wang, Wei Wang, Zhaolong Ge, Man Wang, Chaoyu Xu","doi":"10.1002/nag.3975","DOIUrl":"https://doi.org/10.1002/nag.3975","url":null,"abstract":"To better understand the strain‐softening effect and its implications for coal construction and extraction, this paper utilizes a numerical simulation method to investigate the deformation stability of gas extraction holes with consideration for strain softening. The study further analyzes the strain‐softening effect on effective stress, gas pressure, and plastic failure mode by comparing models with and without considering this effect. The results show that the plastic failure mode in the area close to the hole wall is mainly tensile shear combination failure. Shear failure occurs at the intersection angle of the X‐type shear zone and both the left and right sides, whereas tensile failure more likely occurs on the upper and lower sides due to shrinkage collapse. The displacement of coal increases with extraction time and stabilizes, along with the maximum effective stress concentration area and the plastic damage area. The strain softening process can negatively affect the extraction hole by increasing the displacement of coal, intensifying stress concentration, and exacerbating gas silting near the hole wall, ultimately hindering gas extraction efficiency. Also, faults and weak interbeds can further destabilize the extraction hole.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"216 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143736498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

New Hyperstatic Reaction Method for Design of Subrectangular Tunnel Under Quasi‐Static Loading in Full‐Slip Condition

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-03-28 DOI: 10.1002/nag.3973

Van‐Vi Pham, Ngoc‐Anh Do, Piotr Osinski, Hoang‐Giang Bui, Daniel Dias

{"title":"New Hyperstatic Reaction Method for Design of Subrectangular Tunnel Under Quasi‐Static Loading in Full‐Slip Condition","authors":"Van‐Vi Pham, Ngoc‐Anh Do, Piotr Osinski, Hoang‐Giang Bui, Daniel Dias","doi":"10.1002/nag.3973","DOIUrl":"https://doi.org/10.1002/nag.3973","url":null,"abstract":"In seismic tunnel lining design, most existing studies have focused on circular and box‐type tunnels, while the response of subrectangular tunnel linings under seismic loading, especially in imperfect soil‐lining conditions, remains underexplored. The present paper aims to address this gap by investigating the behavior of subrectangular tunnel lining subjected to seismic loadings in full‐slip condition using a novel calculation approach based on the hyperstatic reaction method (HRM). The innovation of this study is the introduction of a new quasi‐static loading scheme to characterize the soil‐lining interaction for subrectangular tunnels. New relationships between loading parameters, soil Young's modulus, tunnel lining thickness, tunnel dimension, and maximum horizontal acceleration are established through the back analysis of HRM and finite difference method (FDM) calculations. These relationships are then verified by considering different input parameters affecting subrectangular tunnel behavior under full‐slip conditions. Numerical results indicate that the maximum incremental internal forces computed by the new HRM model are in excellent agreement with those from FDM. Meanwhile, the computational efficiency of HRM is far better than FDM due to 1D meshing and simpler boundary conditions. Therefore, the new HRM model offers an effective alternative to FDM for the preliminary design of the subrectangular tunnels subjected to seismic loading in full‐slip conditions.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"17 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143733952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 Temperature‐ and Rate‐Dependent Behavior of Soft Soils: A Thermo‐Visco‐Hypoplastic Approach

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-03-23 DOI: 10.1002/nag.3976

Merita Tafili

引用次数: 0

Semi‐analytical Solution of a Shallow Buried Lined Tunnel Under Full‐Slip Contact Condition

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-03-19 DOI: 10.1002/nag.3970

Hui Cai, Hongliang Liu, Xin Gao, Xinbo Jiang, Wenfeng Tu

{"title":"Semi‐analytical Solution of a Shallow Buried Lined Tunnel Under Full‐Slip Contact Condition","authors":"Hui Cai, Hongliang Liu, Xin Gao, Xinbo Jiang, Wenfeng Tu","doi":"10.1002/nag.3970","DOIUrl":"https://doi.org/10.1002/nag.3970","url":null,"abstract":"This paper presents a semi‐analytical method for the stress and displacement of a shallow buried lined tunnel based on the complex variable method under the full‐slip contact condition, that is, along the interface between the surrounding rock/soil mass and lining, the radial stresses and radial displacements are continuous, and the shear stresses are equal to zero. In the presented solution, the interaction between the surrounding rock/soil mass and lining, as well as the self‐weight of rock/soil mass are considered. The equations based on the boundary conditions and continuity conditions are put forward in this paper. A comparison of the stresses and displacements obtained by the analytical solution and ANSYS software shows a good agreement between the two solutions. In addition, the results also satisfied the stress boundary condition, stress continuity condition, and displacement continuity condition. A parametric study was conducted to investigate the influence of the key parameters on Young's modulus and buried depth. Finally, the results of two extreme boundary contact conditions cases, full‐slip and no‐slip contact conditions, were compared with each other to discuss the effect of the lining and the difference between the two boundary contact conditions.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"201 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143661410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Correlation Characterization Method for Thermal Parameters of Frozen Soil Under Incomplete Probability Information

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-03-12 DOI: 10.1002/nag.3966

Jiazeng Cao, Tao Wang, Yonglin Feng, Jin Wu, Zhiyang Wang, Guoqing Zhou

{"title":"Correlation Characterization Method for Thermal Parameters of Frozen Soil Under Incomplete Probability Information","authors":"Jiazeng Cao, Tao Wang, Yonglin Feng, Jin Wu, Zhiyang Wang, Guoqing Zhou","doi":"10.1002/nag.3966","DOIUrl":"https://doi.org/10.1002/nag.3966","url":null,"abstract":"In the construction process of the artificial ground freezing (AGF), the utilization of the temperature field to determine the freezing time is crucial for the safe construction. While the thermal parameter is the core parameter of the temperature field calculation. How to obtain the joint probability distribution of thermal parameters of frozen soil under limited test data is essential to improve the accuracy of the stochastic temperature field and guide safe construction. In this study, based on the sample of frozen soil in Mengtie railway station of Anhui metro line, the statistical characteristics of the thermal conductivity, volumetric heat capacity, and thermal conductivity at various temperatures were obtained. Then multidimensional Gaussian copula models at different temperatures were constructed using three construction methods to characterize the correlations among the thermal parameters. Additionally, the correlation coefficients under three methods were simulated using Monte Carlo simulation (MCS) and the fitting errors were calculated. Finally, the Sobol indices of thermal parameters were calculated by a simple one‐dimensional heat conduction model. The results show that the frozen soil thermal parameters have obvious correlation variability at various temperatures. The Pearson method presents the most favorable fitting capability in the construction of the joint distribution model of frozen soil thermal variables. The error of the simulation results is the smallest when the construction method and correlation coefficient are identical. The Sobol indices calculated by different methods have significant differences, with the Sobol indices using the Kendall method exhibiting a higher sensitivity to the nonlinearity of the parameters.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"4 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143608346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Prediction of Unconfined Compressive Strength of Cemented Tailings Backfill Containing Coarse Aggregate Using a Hybrid Model Based on Extreme Gradient Boosting

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-03-12 DOI: 10.1002/nag.3972

Jinping Guo, Zechen Li, Xiaolin Wang, Qinghua Gu, Ming Zhang, Haiqiang Jiang, Caiwu Lu

{"title":"Prediction of Unconfined Compressive Strength of Cemented Tailings Backfill Containing Coarse Aggregate Using a Hybrid Model Based on Extreme Gradient Boosting","authors":"Jinping Guo, Zechen Li, Xiaolin Wang, Qinghua Gu, Ming Zhang, Haiqiang Jiang, Caiwu Lu","doi":"10.1002/nag.3972","DOIUrl":"https://doi.org/10.1002/nag.3972","url":null,"abstract":"The utilization of cemented tailings backfill (CTB) presents distinct advantages in managing tailings and underground mining voids, occasionally incorporating coarse aggregate. In this study, the particle swarm optimization (PSO) algorithm was employed to optimize the extreme gradient boosting (XGBoost) model for predicting the unconfined compressive strength (UCS) of CTB containing coarse aggregate (CTBCA). Additionally, feature importance was compared and analyzed. The findings indicate that the PSO‐XGBoost model exhibits high accuracy on the test set, with a root mean square error (RMSE) of 0.091, a mean square error (MSE) of 0.008, and a coefficient of determination (R2) of 0.999. The predicted values demonstrate a high degree of consistency with the actual results, exhibiting minimal errors that follow a normal distribution. The feature importance analysis reveals that the cement‐sand ratio holds the highest importance score and exerts a significant influence on the UCS prediction. In descending order of impact, the next most significant factors are curing age, slurry concentration, and the coarse aggregate ratio. The proposed PSO‐XGBoost model effectively reduces the UCS measurement cycle while maintaining prediction accuracy. Thus, this model has the potential to provide a fast and efficient method for predicting the UCS of CTBCA.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"49 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143607953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 Simulation of Debris Flow Impact on Pier With Different Cross‐Sectional Shapes Based on Coupled CFD‐DEM

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-03-12 DOI: 10.1002/nag.3971

Zhuhong Wang, Hang Zhou, Yunzhou Li, Zengliang Wang

{"title":"Numerical Simulation of Debris Flow Impact on Pier With Different Cross‐Sectional Shapes Based on Coupled CFD‐DEM","authors":"Zhuhong Wang, Hang Zhou, Yunzhou Li, Zengliang Wang","doi":"10.1002/nag.3971","DOIUrl":"https://doi.org/10.1002/nag.3971","url":null,"abstract":"Concrete piers located in steep mountainous regions are highly susceptible to damage from debris flows. Existing studies often oversimplify debris flows as particle flows or equivalent fluids, neglecting their multiphase characteristics. In this paper, a three‐dimensional numerical model of debris flow‐bridge piers interaction is established based on the coupled CFD‐DEM approach. The Hertz–Mindlin (no‐slip) model and the Navier–Stokes equations are employed to describe the behavior of particle contacts and the fluid phase, respectively. An interface program compiled using user‐defined functions (UDFs) facilitates the transfer of information (drag, buoyancy, and viscous forces) between the fluid and particles. The accuracy of the model is validated by the simulation results of single‐particle settlement and underwater granular collapse. This study conducts a detailed investigation into the interaction mechanisms between the debris flow—bridge piers, considering the cross‐sectional shape of the piers and the solid volume fraction. It has been discovered that the shape of the bridge piers significantly influences the behavior of debris flows and the separation points. A power function effectively describes the relationship between the solid volume fraction and the peak impact force coefficient, Cd. Simplifying debris flows to dry granular flows or equivalent fluids may lead to an underestimation of the impact pressure.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"14 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143607951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Multiphase and Multiphysics Modelling of Rainfall Induced Failure in an Experimental Hillslope

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-03-11 DOI: 10.1002/nag.3963

Maria Lazari, Matteo Camporese, Lorenzo Sanavia

{"title":"Multiphase and Multiphysics Modelling of Rainfall Induced Failure in an Experimental Hillslope","authors":"Maria Lazari, Matteo Camporese, Lorenzo Sanavia","doi":"10.1002/nag.3963","DOIUrl":"https://doi.org/10.1002/nag.3963","url":null,"abstract":"Annual precipitation and its intensity have increased worldwide since the start of the 20th century and represent two weather and climate change indicators related to rainfall‐induced landslides. Although these landslides can occur in a very short time, the hydro‐mechanical conditions that precede them can take several hours or days to develop. In this context, understanding the mechanisms of rainfall‐induced landslides and their numerical modelling is topical for reducing risks to human life, facilities and infrastructure and economic loss.In this work, a large‐scale experimental hillslope subjected to a controlled rainfall is studied numerically. Sensors and optical fibres were placed in the slope to monitor water pressure and moisture content in the failure layer, as well as axial strain and temperature in the failure surface. The outflow at the toe of the slope was also measured. The experimental hillslope is modelled as a fully coupled variably saturated hydro‐thermo‐mechanical problem in dynamics. A general geometrically linear finite element model based on Hybrid Mixture Theory and enhanced with Taylor‐Hood finite elements is used. The soil response is modelled with the Bolzon–Schrefler model for non‐isothermal variably saturated soils. The failure mechanism is further assessed using the global second‐order work criterion. The comparison between the experimental and numerical results is analysed using the KGE indicator, showing that the model is capable to correctly reproduce both the hydrological dynamics leading to failure and the strain along the failure surface. The global second‐order work criterion proved to predict the proneness to failure.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"60 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143599378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Transient Analysis of a Poroelastic Soil Layer Due to Horizontal Movement of a Rigid Disk Attached on the Layer With a Relaxed Boundary Condition

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-03-11 DOI: 10.1002/nag.3967

Xinjun Zou, Zijian Yang, Minhua Zhou, Lanyi Huang

{"title":"Transient Analysis of a Poroelastic Soil Layer Due to Horizontal Movement of a Rigid Disk Attached on the Layer With a Relaxed Boundary Condition","authors":"Xinjun Zou, Zijian Yang, Minhua Zhou, Lanyi Huang","doi":"10.1002/nag.3967","DOIUrl":"https://doi.org/10.1002/nag.3967","url":null,"abstract":"This paper is concerned with the study of a poroelastic soil layer under impulsive horizontal loading. Building upon Biot's general theory of poroelasticity, a comprehensive set of governing equations addressing three‐dimensional transient wave propagation problem are established. Explicit general solutions for displacements and pore‐pressures are derived by employing a sophisticated mathematical approach, incorporating decoupling transformation, Fourier series expansion, and Laplace–Hankel integral transform techniques. Subsequently, physical‐domain components are numerically obtained by an enhanced Durbin method coupled with inverse Hankel transform. Comparisons the existing transient solutions for the ideal elastic half‐space are made to validate the proposed formulations' reliability and precision. Through representative analyses for time‐domain results, it is illustrated to study the influence of the soil thickness and types of loading pulse on the transient dynamic response of finite‐thickness poroelastic soil layers. The results in comparative analysis show that the magnitudes of the horizontal displacement and pore water pressure can be affected and become more fluctuant when the thickness of the poroelastic soil layer decreases. The basic solutions may be attributed to a variety of wave propagation problems due to transient dynamic loading and illustrate the corresponding distinct wave features elegantly.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"56 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143599379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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