International Journal for Numerical and Analytical Methods in Geomechanics最新文献_第2页

PML‐Based Family of Stretched Coordinate Systems for Wave Propagation in Poroelastic Transversely Isotropic Half‐Space

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-04-12 DOI: 10.1002/nag.3981

Kamal Shaker, Morteza Eskandari‐Ghadi, Soheil Mohammadi

{"title":"PML‐Based Family of Stretched Coordinate Systems for Wave Propagation in Poroelastic Transversely Isotropic Half‐Space","authors":"Kamal Shaker, Morteza Eskandari‐Ghadi, Soheil Mohammadi","doi":"10.1002/nag.3981","DOIUrl":"https://doi.org/10.1002/nag.3981","url":null,"abstract":"Investigating wave propagation in transversely isotropic saturated poroelastic material and introducing a family of stretched coordinate transformations to be used for defining a perfectly matched layer (PML) are the main aims of this paper. To this end, the formulation of Biot is adopted as the governing framework of the porous media. The coupled equations of motion and transport equation are uncoupled by means of the recently proposed two scalar potential functions in cylindrical coordinate system. Two separated families of continuous stretched coordinate transformations are introduced for each of radial and axial coordinates, which allows the whole half‐space to be replaced by a finite cylinder surrounded by an outer cylinder/cube with both finite height and radius. It is shown that the displacements and pore fluid pressure, determined from the analysis of the replaced cylindrical domain, is exactly collapsed on the analytical solution in the inner cylinder, while they are, based on the stretched coordinate transformation, attenuated very fast in the outer cylinder to prevent the reflection from the most exterior boundaries. The results of this study may be used in any wave propagation analysis containing either isotropic or transversely isotropic half‐ or full‐space.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"38 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143824848","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

Cover Image, Volume 49, Issue 6

IF 3.4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-04-08 DOI: 10.1002/nag.3980

Taegu Kim, Tae Sup Yun, Hyoung Suk Suh

引用次数: 0

Working Face Stability Analysis of a Quasi‐Rectangular Pipe‐Jacking Tunnel Considering the Carrying‐Soil Effect

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-04-08 DOI: 10.1002/nag.3982

Fu Huang, Yongtao Wang, Min Zhang, Qiujing Pan

{"title":"Working Face Stability Analysis of a Quasi‐Rectangular Pipe‐Jacking Tunnel Considering the Carrying‐Soil Effect","authors":"Fu Huang, Yongtao Wang, Min Zhang, Qiujing Pan","doi":"10.1002/nag.3982","DOIUrl":"https://doi.org/10.1002/nag.3982","url":null,"abstract":"Compared with circular shield tunnels, quasi‐rectangular pipe‐jacking tunnels have the advantages of smaller construction disturbances and higher space utilization rates, which are widely applied in urban underground engineering. The carrying‐soil effect is a specific phenomenon during the construction of pipe‐jacking tunnels. To study the influence of carrying‐soil effect on the working face stability of a quasi‐rectangular pipe‐jacking tunnel, the collapse and blow‐out failure mechanisms of the working face are established on the basis of spatial discretization technique. By analysing the mechanical mechanism of the carrying‐soil effect, the upper bound solution of the critical chamber pressure of the working face that considers the carrying‐soil effect is obtained in this paper. Based on an actual project, the theoretical results are compared with the numerical results, proving the effectiveness of the proposed method. Furthermore, parametric analysis indicates that the jacking distance of the pipe‐jacking tunnel has a significant influence on the working face stability, while the influence of the frictional force between the soil and the pipe is relatively small.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"16 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143805737","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

Theoretical Analysis of Macroscopic Mechanical Properties of Coexistence Type Methane Hydrate‐Bearing Sediments by Micromechanics‐Based Model

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-04-08 DOI: 10.1002/nag.3978

Zhihao Zhou, Huaning Wang, Mingjing Jiang

{"title":"Theoretical Analysis of Macroscopic Mechanical Properties of Coexistence Type Methane Hydrate‐Bearing Sediments by Micromechanics‐Based Model","authors":"Zhihao Zhou, Huaning Wang, Mingjing Jiang","doi":"10.1002/nag.3978","DOIUrl":"https://doi.org/10.1002/nag.3978","url":null,"abstract":"The impacts of different types of methane hydrates (e.g., pore‐filling, load‐bearing, grain‐coating, and cementing types) on the mechanical properties of methane hydrate‐bearing sediments (MHBS) exhibit significant variations. However, the quantitative distinctions remain largely unexplored. Following the framework of the classical micromechanics‐based model, a simplified physical model of regularly arranged particle assembly is proposed for the coexistent‐type MHBS (the MHBS containing two or more types of hydrates) to derive the macroscopic constitutive relations, strength criteria, and corresponding macro–micro quantitative correlation of elastic and strength parameters. The obtained theoretical solutions are verified by comparison with indoor test results, and the influence of environmental factors and hydrate saturation, especially different types of hydrates, on the macroscopic mechanical properties of MHBS under various initial planar void ratios of sediments is investigated in detail. The results show that there are significant differences in the micromechanisms that affect the macroscopic mechanical properties of different hydrate types. Specifically, the load‐bearing hydrate has almost no contribution to the improvement of the elastic modulus and peak strength, while the cementing type plays a dominant role in the macroscopic mechanical properties of MHBS, and the influence of the hydrate with the grain‐coating type is between the load‐bearing and cementing types.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"6 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143805736","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

Jacking Force Prediction for Box Jacking Tunnel Considering the Soil Arching Effect

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-04-07 DOI: 10.1002/nag.3979

Da Hu, Junjie Huang, Xuejuan Xiang, Pengpeng Ni, Yongsuo Li, Xiaoqiang Liang, Jing Liu

{"title":"Jacking Force Prediction for Box Jacking Tunnel Considering the Soil Arching Effect","authors":"Da Hu, Junjie Huang, Xuejuan Xiang, Pengpeng Ni, Yongsuo Li, Xiaoqiang Liang, Jing Liu","doi":"10.1002/nag.3979","DOIUrl":"https://doi.org/10.1002/nag.3979","url":null,"abstract":"During the construction of box jacking tunnel, stress transfer caused by the soil arching effect is an important factor, affecting the jacking force. This study proposes a jacking force prediction method for box jacking tunnels under the complete and incomplete soil arching effect in sandy soils, which is divided into three soil domains, i.e., an external stable region, an elastic arch, and an internal loosened body. Three‐dimensional numerical analyses for box jacking tunnel at various cover depths are also investigated to show the stress changes in the soil around the tunnel and the evolution of soil arch formation. Finally, through theoretical derivation and case analysis, the ratio between the influence range of soil arching and the width of loosened soil, , is found to increase with increasing the tunnel size and internal friction angle of soil. The coefficient can be preliminarily determined to be approximately 1.4, with a marginal difference of 6.7% compared with the Terzaghi's proposal of 1.5. Results show that in sandy and silty soil strata, the proposed method outperforms the other methods, in terms of accuracy and adaptability. This study can serve as a theoretical reference for the design and construction of box jacking tunnels.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"4 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143789754","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

A Framework for Estimating Matric Suction in Compacted Fine‐Grained Soils Based on a Machine Learning‐Assisted Conceptual Model 基于机器学习辅助概念模型的压实细粒土母吸力估算框架

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-04-05 DOI: 10.1002/nag.3974

Junjie Wang, Sai Vanapalli

{"title":"A Framework for Estimating Matric Suction in Compacted Fine‐Grained Soils Based on a Machine Learning‐Assisted Conceptual Model","authors":"Junjie Wang, Sai Vanapalli","doi":"10.1002/nag.3974","DOIUrl":"https://doi.org/10.1002/nag.3974","url":null,"abstract":"In this study, a hybrid black‐ and white‐box machine learning (ML) framework is proposed for matric suction estimation in compacted fine‐grained soils, utilizing ML techniques, namely, particle swarm optimized support vector regression (PSO‐SVR) and multi‐gene genetic programming (MGGP). This objective is achieved through developing a novel ML‐based method for designing requisite soil parameters, including a new parameter, the “effective degree of aggregation”. This parameter captures the influence of varying soil structures associated with different initial water content conditions in compacted fine‐grained soils for estimating matric suction. Additionally, sensitivity analyses are performed to better understand the significance of the effective degree of aggregation and other critical soil properties. Explicit equations are derived from the MGGP models, enabling their use for matric suction estimation using spreadsheets and alleviating the reliance on complex programming tools. The proposed models are promising for use in the prediction of hydro‐mechanical behavior and other related compacted fine‐grained soil properties, facilitating their application in conventional geotechnical engineering practice.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"47 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143782636","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

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