Computers and Geotechnics最新文献

Phase-field modeling of CO2 fracturing: effects of natural fractures and formation interlayer contrast CO2压裂的相场模拟：天然裂缝和地层层间对比的影响

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2025-06-03 DOI: 10.1016/j.compgeo.2025.107386

L. Li , X.L. Yang , T. Yu , N. Guo

{"title":"Phase-field modeling of CO2 fracturing: effects of natural fractures and formation interlayer contrast","authors":"L. Li , X.L. Yang , T. Yu , N. Guo","doi":"10.1016/j.compgeo.2025.107386","DOIUrl":"10.1016/j.compgeo.2025.107386","url":null,"abstract":"<div><div>CO<sub>2</sub> fracturing has been recognized for its significant advantages in enhancing petroleum recovery. In this study, we establish a finite volume method (FVM)-based phase-field model to simulate CO<sub>2</sub> fracturing in poroelastic media, accounting for fluid property variations with temperature and pressure. The porous medium is modeled using classical Biot poroelasticity theory, while fracture behavior is described through a phase-field framework. The phase field acts as an interpolation function to smoothly transition properties between the fracture and reservoir regions. The governing equations are discretized using an implicit cell-centered FVM and solved via an iterative staggered scheme. CO<sub>2</sub> thermophysical properties are updated via the Peng–Robinson equation of state and the Lohrenz–Bray–Clark viscosity model. The framework is verified through a 2D notched specimen subjected to injection of water and CO<sub>2</sub>. It is then applied to investigate fracture propagation in both homogeneous and heterogeneous shale reservoirs. For the homogeneous cases, we analyze the effects of horizontal principal stress differences and natural fracture approach angles. For the heterogeneous reservoirs, we examine how natural fracture orientation and interlayer elastic modulus contrast affect fracture morphology and propagation. This study demonstrates the robustness of the proposed framework in capturing complex fracture behavior, offering insights into optimizing CO<sub>2</sub> fracturing for unconventional gas and oil extraction.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"186 ","pages":"Article 107386"},"PeriodicalIF":5.3,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144195987","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

Theoretical solution for drained cylindrical cavity expansion in sands incorporating fabric anisotropy using the SANISAND-F model 考虑织物各向异性的砂土排水柱腔扩张的SANISAND-F模型理论解

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2025-06-02 DOI: 10.1016/j.compgeo.2025.107380

Cheng Chen , Lei Yan , Xianwei Zhang , Yong Wang , Zhonghua Sun , Mengbing Xu

{"title":"Theoretical solution for drained cylindrical cavity expansion in sands incorporating fabric anisotropy using the SANISAND-F model","authors":"Cheng Chen , Lei Yan , Xianwei Zhang , Yong Wang , Zhonghua Sun , Mengbing Xu","doi":"10.1016/j.compgeo.2025.107380","DOIUrl":"10.1016/j.compgeo.2025.107380","url":null,"abstract":"<div><div>This paper presents a rigorous, semi-analytical solution for the drained cylindrical cavity expansion in transversely isotropic sand. The constitutive model used for the sand is the SANISAND-F model, which is developed within the anisotropic critical state theory framework that can account for the essential fabric anisotropy of soils. By introducing an auxiliary variable, the governing equations of the cylindrical expansion problem are transformed into a system of ten first-order ordinary differential equations. Three of these correspond to the stress components, three are associated with the kinematic hardening tensor, three describe the fabric tensor, and the last one represents the specific volume. The solution is validated through comparison with finite element analysis, using Toyoura sand as the reference material. Parametric analyses and discussion on the impact of initial void ratio, initial mean stress level, at-rest earth pressure coefficient and initial fabric anisotropy intensity are presented. The results demonstrate that the fabric anisotropy of sand significantly influences the distribution of stress components and void ratio around the cavity. When fabric anisotropy is considered, the solution predicts lower values of radial, circumferential and vertical stresses near the cavity wall compared to those obtained without considering fabric anisotropy. The proposed solution is expected to enhance the accuracy of cavity expansion predictions in sand, which will have significant practical applications, including interpreting pressuremeter tests, predicting effects of driven pile installation, and improving the understanding of sand mechanics under complex loading scenarios.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"186 ","pages":"Article 107380"},"PeriodicalIF":5.3,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144189584","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

Automatic simulation of soil-rock mixture seepage using image model directly 直接利用图像模型自动模拟土石混合体渗流

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2025-06-02 DOI: 10.1016/j.compgeo.2025.107341

Xinying Shen , Jie Wu , Zhenzhen Song , Tingshuo Jia

{"title":"Automatic simulation of soil-rock mixture seepage using image model directly","authors":"Xinying Shen , Jie Wu , Zhenzhen Song , Tingshuo Jia","doi":"10.1016/j.compgeo.2025.107341","DOIUrl":"10.1016/j.compgeo.2025.107341","url":null,"abstract":"<div><div>Meso-structures in soil-rock mixtures (SRM) exhibit complex geometries that significantly impact their seepage characteristics. The simulation of these structures through conventional methods, such as the Finite Element Method (FEM), necessitates the development of CAD (computer-aided design) models and the generation of conforming meshes. This process is often labor-intensive and can be cumbersome.</div><div>In this work, a seepage analysis that employs image models and structured grids, thus owning high automatic level, is first developed for SRM. Compared to traditional boundary (2D) or surface models (3D), image models can sincerely and efficiently capture the <em>meso</em>-structure of SRM. Using structured grids significantly alleviates the preprocessing workload associated with generating conforming meshes. The element size of the structured grid is completely independent of the pixel size of the image model, facilitating a flexible trade-off between computational accuracy and time efficiency. Weak discontinuities in the seepage field at the soil-rock interfaces are accurately represented using continuous-discontinuous (C-D) trial functions using the Numerical Manifold Method (NMM), enforced through penalty methods. Numerical examples investigate the computational accuracy and efficacy of the proposed method. More promisingly, the direct use of image models and structured grids in simulating SRM greatly reduces manual intervention, demonstrating the new method’s outstanding automation advantage and providing a methodological foundation for the development of related unmanned hardware devices.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"186 ","pages":"Article 107341"},"PeriodicalIF":5.3,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144189585","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 evaluation of the dynamic performance of recommissioned offshore wind turbines under service life extension and repowering strategies 延长使用寿命和再动力策略下海上风力发电机组动态性能的数值评估

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2025-06-02 DOI: 10.1016/j.compgeo.2025.107370

Yikang Wang , Fayun Liang , Hao Zhang , Hanbo Zheng

{"title":"Numerical evaluation of the dynamic performance of recommissioned offshore wind turbines under service life extension and repowering strategies","authors":"Yikang Wang , Fayun Liang , Hao Zhang , Hanbo Zheng","doi":"10.1016/j.compgeo.2025.107370","DOIUrl":"10.1016/j.compgeo.2025.107370","url":null,"abstract":"<div><div>This study addresses the recommissioning needs of offshore wind farms facing foundation degradation and equipment aging after years of operation. Service Life Extension (SLE) and Repowering, as key strategies to reduce decommissioning costs and enhance asset value, have been successfully applied to multiple wind farms. Based on advanced 3D finite element (FE) simulations, this study systematically analyzes the dynamic response of sand-monopile-offshore wind turbine (OWT) system under long-term service and scour effects, focusing on the impact of recommissioning strategies, including upper structure replacement (Repowering) and cement-solidified soil foundation remediation (SLE). The analysis reveals that long-term service and scour effects significantly reduce the natural frequency of OWTs, increasing the risk of resonance and exacerbating the dynamic response and deformation of the tower. Replacing the upper structure with a lower-power OWT can effectively enhance the tower’s resistance to deformation but may lead to increased dynamic response at the nacelle. When replacing with a higher-power OWT, cement- solidified soil remediation significantly restores the turbine’s service performance by suppressing displacement and strain accumulation in shallow soils, though its effectiveness diminishes as the remediation height increases. These findings provide valuable insights for selecting and evaluating recommissioning strategies for OWTs.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"186 ","pages":"Article 107370"},"PeriodicalIF":5.3,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144195986","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

Probabilistic analysis of tunnel deformation and ground surface settlement induced by surcharge in spatially variable soil 空间变土中堆填土引起隧道变形和地表沉降的概率分析

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2025-05-31 DOI: 10.1016/j.compgeo.2025.107369

Han Han , Wengang Zhang , Zhihao Wu , Weixin Sun

{"title":"Probabilistic analysis of tunnel deformation and ground surface settlement induced by surcharge in spatially variable soil","authors":"Han Han , Wengang Zhang , Zhihao Wu , Weixin Sun","doi":"10.1016/j.compgeo.2025.107369","DOIUrl":"10.1016/j.compgeo.2025.107369","url":null,"abstract":"<div><div>Existing tunnels are inevitably influenced by surrounding environments, with ground surface surcharge being one of the most significant factors affecting tunnel deformations and ground surface settlement. At the same time, the spatial variability of soils also plays a crucial role in these outcomes. However, many studies rely on deterministic analyses that overlook the spatial variability of soils, which can lead to inaccurate predictions of tunnel behavior and surface settlement. Furthermore, there is limited research that simultaneously considers the effects of both surcharge and the spatial variability of soil on these responses in a three-dimensional space. In this study, the impact of surcharge and uncertain soil properties on surface settlement and tunnel deformations was investigated based on random fields combined with the finite element method. The influence of surcharge positions <em>L</em>, eccentricities <em>e</em>, heights <em>h</em>, as well as the coefficient of variation of Young's modulus (<em>COV<sub>E</sub></em>) and scales of fluctuation (SOF) of Young's modulus on surface settlement and tunnel deformations were investigated. As <em>L</em> increases, with the surcharge shifting from the center towards the boundaries, the maximum tunnel deformations and surface settlement, along with the corresponding probability of failure (<em>P<sub>f</sub></em>) intensify, due to the limited space for dissipation of the surcharge. As <em>e</em> increases, these effects decrease. In contrast, an increase in <em>h</em> amplifies them. The larger the <em>COV<sub>E</sub></em>, the greater the impact of the surcharge on tunnel deformations, surface settlement, and the corresponding <em>P<sub>f</sub></em>. This is because a larger <em>COV<sub>E</sub></em> increases the probability of extreme realizations. Similar to the effect of <em>COV<sub>E</sub></em>, a larger SOF increases the impact of soil spatial variability.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"186 ","pages":"Article 107369"},"PeriodicalIF":5.3,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144185504","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 implicit nodal integration-based three-dimensional particle finite element model for simulating dynamic saturated porous media 基于隐式节点积分的动态饱和多孔介质三维颗粒有限元模型

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2025-05-31 DOI: 10.1016/j.compgeo.2025.107372

Liang Wang , Qiang Xue , Yong Wan , Jingjing Meng , Xiang Sun , Tao Zhao , Houzhen Wei , Xue Zhang

{"title":"An implicit nodal integration-based three-dimensional particle finite element model for simulating dynamic saturated porous media","authors":"Liang Wang , Qiang Xue , Yong Wan , Jingjing Meng , Xiang Sun , Tao Zhao , Houzhen Wei , Xue Zhang","doi":"10.1016/j.compgeo.2025.107372","DOIUrl":"10.1016/j.compgeo.2025.107372","url":null,"abstract":"<div><div>Large deformation analysis of dynamic saturated porous media holds significant importance in accurately describing the life of various geotechnical and geological applications, since they can seamlessly capture the continuous variation of geomaterials with extreme changes in configurations and properties. Many numerical models have been developed, while most of them are limited to two-dimensional scenarios and explicit time integration schemes, which therefore compromise their accuracy and efficiency in studying low- and medium-frequency practical problems. In addition, different stabilisation techniques with tunable parameters are often required when using the efficient linear elements for dynamic analysis. To overcome these hurdles, this work introduces an implicit three-dimensional nodal integration-based particle finite element method (N-PFEM) that combines the advantages of a mixed variational principle, a nodal-based strain smoothing technique, mathematical programming, and the particle finite element method, ensuring the accuracy and robustness in analysing dynamic saturated media. The three-dimensional N-PFEM is thoroughly examined against four numerical benchmarks, for which numerical solutions agree well with reference solutions or experimental data. The model is further applied to simulate earthquake-induced slope failures, which characterises the effect of material property on the initiation and propagation of landslides in a three-dimensional space. The developed model holds important implications for developing numerical approaches and demonstrates strong potential as an effective and practical tool in analysing the hydro-mechanical behaviour of geomaterials in real applications.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"186 ","pages":"Article 107372"},"PeriodicalIF":5.3,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144185423","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 novel meshless method for solving steady seepage problems with free surface based on physics-informed neural networks 一种基于物理信息神经网络求解自由面稳定渗流问题的无网格新方法

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2025-05-31 DOI: 10.1016/j.compgeo.2025.107348

Zhenhua Huang , Binghan Xue , Manjun Li , Jianwei Lei , Hongyuan Fang

{"title":"A novel meshless method for solving steady seepage problems with free surface based on physics-informed neural networks","authors":"Zhenhua Huang , Binghan Xue , Manjun Li , Jianwei Lei , Hongyuan Fang","doi":"10.1016/j.compgeo.2025.107348","DOIUrl":"10.1016/j.compgeo.2025.107348","url":null,"abstract":"<div><div>Accurate computation of steady seepage fields with free surfaces is crucial in various engineering disciplines, including hydraulic engineering, geotechnical engineering, and petroleum extraction. However, existing computational methods often face challenges related to insufficient accuracy and strong dependence on mesh quality. To address these limitations, this paper proposes a novel meshless computational approach based on PINNs for solving steady seepage fields with free surfaces. The proposed method transforms the free surface steady seepage problem into a fixed boundary problem, which is then solved iteratively using PINNs. This approach effectively eliminates the reliance on mesh quality inherent in traditional FEM while possessing the advantage of fixed-mesh methods, which do not require mesh adjustments during the iterative process. Numerical experiments demonstrate that the proposed method achieves high solution accuracy and is applicable to three-dimensional problems. Furthermore, the proposed method’s performance is unaffected by the initial setting of the free surface. Compared to FEM, the proposed method demonstrates superior computational accuracy and stability, particularly under conditions of low-density mesh nodes, and avoids interpolation-related errors. Notably, the proposed method maintains its computational accuracy even when dealing with distorted meshes, whereas FEM fails to converge under such conditions. The proposed method offers a promising alternative for analysing steady seepage fields with free surfaces and holds significant potential for addressing seepage-related challenges in practical engineering applications.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"186 ","pages":"Article 107348"},"PeriodicalIF":5.3,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144185422","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

Nonlinear seismic soil-structure interaction analysis of shallow-founded structure: centrifuge test, numerical analysis, and deep learning approach 浅基础结构非线性地震土-结构相互作用分析：离心试验、数值分析和深度学习方法

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2025-05-31 DOI: 10.1016/j.compgeo.2025.107382

Dong Van Nguyen , YunWook Choo , Phong Hung Nguyen , Dookie Kim

{"title":"Nonlinear seismic soil-structure interaction analysis of shallow-founded structure: centrifuge test, numerical analysis, and deep learning approach","authors":"Dong Van Nguyen , YunWook Choo , Phong Hung Nguyen , Dookie Kim","doi":"10.1016/j.compgeo.2025.107382","DOIUrl":"10.1016/j.compgeo.2025.107382","url":null,"abstract":"<div><div>This study pioneers the application of deep learning-based approaches to predict nonlinear seismic time history responses of above-ground structures with shallow foundations considering soil-structure interaction (SSI). Long short-term memory (LSTM) and gated recurrent unit (GRU) models are selected for training. The training data are generated through numerical simulations validated by a centrifuge test. Nonlinear materials for both soil and structure, as well as nonlinear contact, are fully considered. The seismic response of the structure is calculated using two types of models: (i) an advanced SSI system, integrating soil and structure in one model, and (ii) a fixed-base structure, a simplified model commonly used in practice. A limited number of real earthquakes with a wide range of properties are chosen to demonstrate the predictive ability of the deep learning models. Hyper-parameters of the models are carefully investigated in terms of validation loss and training time. The effectiveness of the models is demonstrated through representations of time history responses and response spectra. The results are discussed and compared between the LSTM and GRU models, as well as between the SSI system and the fixed-base structure.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"186 ","pages":"Article 107382"},"PeriodicalIF":5.3,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144178400","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

Modified unified hardening model for breakable coarse-grained soils with nonlinear critical state behavior under low confining pressure 低围压下具有非线性临界态特性的破碎粗粒土的修正统一硬化模型

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2025-05-30 DOI: 10.1016/j.compgeo.2025.107376

Yunhao Chen , Ling Zhang , Wengui Cao , Biao Luo , Jingpeng Tan

{"title":"Modified unified hardening model for breakable coarse-grained soils with nonlinear critical state behavior under low confining pressure","authors":"Yunhao Chen , Ling Zhang , Wengui Cao , Biao Luo , Jingpeng Tan","doi":"10.1016/j.compgeo.2025.107376","DOIUrl":"10.1016/j.compgeo.2025.107376","url":null,"abstract":"<div><div>This investigation develops a nonlinear Unified Hardening constitutive model (N-UH-L) for brittle coarse-grained soils (CGSs), e.g., siliceous mudstone coarse-grained soils (SMCGSs), that incorporates the nonlinear behavior of the critical state line (CSL) in the mean stress − deviatoric stress (<em>p − q</em>) space at low confining pressures. In detail, an improved modified Cam-Clay (MCC) strength criterion is integrated with the model, and a nonlinear exponent (<em>δ</em>) is introduced to capture the evolution of the CSL. Then, the effect mechanism of particle breakage on the nonlinear behavior of CSL in <em>p − q</em> space is clarified. Meanwhile, the empirical expressions for the <em>δ</em> were provided for both non-cohesive and cohesive coarse-grained soils (CGSs), respectively, anchored in the relationship between the weighted average improved relative breakage potential and the input plastic work. Furthermore, the model’s predictive capability was confirmed through three cases of consolidated drained triaxial tests (i.e., tests on basalt ballast with Group A and B, latite basalt ballast in New South Wales, and penetrating eroded SMCGS), and one case of Consolidated undrained triaxial test (i.e., test on rockfill materials of Changhe Dam). The results show that the N-UH-L model effectively describes dilatancy, hardening/softening, and their dependence on the initial state of CGSs. Moreover, the nonlinear exponent has minimal impact on the deviatoric stress at the early and late stages of shear strain, but induces significant deviations in deviatoric stress during the mid-stage. Additionally, as the initial void ratio increases, the sensitive zone of deviatoric stress shifts towards earlier stages of strain, while the effect of nonlinear exponent on deviatoric stress decreases with higher confining pressure.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"185 ","pages":"Article 107376"},"PeriodicalIF":5.3,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144169276","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

Permeability of marine gas hydrate-bearing sediments considering effective stress and particle size distribution: A theoretical model 考虑有效应力和粒径分布的海相天然气水合物沉积物渗透率理论模型

IF 5.3 1区工程技术

Computers and Geotechnics Pub Date : 2025-05-30 DOI: 10.1016/j.compgeo.2025.107367

Yihan Shang , Gang Lei , Jiadi Tang , Jiangtao Qu , Fulong Ning

{"title":"Permeability of marine gas hydrate-bearing sediments considering effective stress and particle size distribution: A theoretical model","authors":"Yihan Shang , Gang Lei , Jiadi Tang , Jiangtao Qu , Fulong Ning","doi":"10.1016/j.compgeo.2025.107367","DOIUrl":"10.1016/j.compgeo.2025.107367","url":null,"abstract":"<div><div>Due to heterogeneity of solid particle size, occurrence of gas hydrates in pore space, evolution of pore structures influenced by the changes in effective stress and temperature, the accurate determination of permeability of gas hydrate-bearing sediments (GHBS) remains a great challenge, leading to the unclear flow law in marine gas hydrate reservoirs. In this work, a theoretical permeability model considering effective stress, local thermal stimulation, hydrate saturation, and its occurrence pattern is proposed to predict the permeability for GHBS with heterogeneous particle size distribution. Specifically, by inputting the particle size distribution curve, initial hydrate saturation and relative density of GHBS, the natural-state pore diameter distribution curves of GHBS can be calculated. Then, by combining the calculated pore diameter distribution curve, thermal expansion theory, Hooke’s law and bi-fractal theory, the theoretical permeability model for GHBS is established. Subsequently, the proposed permeability model is thoroughly validated against groups of available experimental data, which indicates the validity of this model. Furthermore, effects of several crucial parameters (e.g., particle size distribution, hydrate saturation, initial porosity, effective stress, and temperature increment, etc.) on the permeability of GHBS are quantitatively revealed through parameter sensitivity analysis. Compared with former permeability models, the permeability prediction accuracy of the proposed model is improved by 5–13%. This model can not only provide accurate permeability predictions of GHBS with heterogeneous particle size distribution, but also reveal more mechanisms affecting the process of fluid flow in GHBS, helping to promote the safe, efficient and stable exploitation of hydrate resources.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"185 ","pages":"Article 107367"},"PeriodicalIF":5.3,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144169293","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