Geomechanics for Energy and the Environment最新文献

{"title":"An engineering elastoplastic anisotropic model applied to the modelling of deep tunnelling in Opalinus Clay","authors":"Aldo Madaschi ,&nbsp;Julia Leuthold ,&nbsp;Linard Cantieni ,&nbsp;Silvio B. Giger ,&nbsp;Lyesse Laloui","doi":"10.1016/j.gete.2025.100721","DOIUrl":"10.1016/j.gete.2025.100721","url":null,"abstract":"<div><div>This paper introduces the Enhanced Anisotropic Damage Plasticity (eADP) model, a novel engineering constitutive approach tailored for tunnel analyses in Opalinus Clay – the designated host rock for the Swiss radioactive waste repository. The model's key innovations lie in its ability to comprehensively capture the complex behaviour of Opalinus Clay within an extremely efficient computational framework, making it suitable for routine engineering calculations and performance assessments. The eADP model adeptly reproduces Opalinus Clay's highly nonlinear stress-strain responses, accounting for anisotropic characteristics for stiffness, strength, and hardening. Honouring such complexity in material behaviour while keeping an efficient numerical performance was a key aspect of the eADP implementation. The model calibration relies on an extensive dataset derived from undrained triaxial tests performed on Opalinus Clay samples sourced recently from the Swiss candidate repository sites. The enhanced formulation and the multi-level optimisation scheme developed and applied in this work ensures a simple and robust parameter identification, showcasing the model's adaptability across varying loading conditions and confining pressures. The verification through hydromechanical computations at repository depths underscores the model's efficacy in realistic tunnel excavation scenarios.</div></div>","PeriodicalId":56008,"journal":{"name":"Geomechanics for Energy and the Environment","volume":"43 ","pages":"Article 100721"},"PeriodicalIF":3.3,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144680696","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}

{"title":"Creep characteristics and damage mechanisms of rock in the plateau tunnel: Insights from acoustic emission and energy evolution","authors":"Yanzhe Li,&nbsp;Chuanxin Rong,&nbsp;Zhensen Wang,&nbsp;Yang Wang","doi":"10.1016/j.gete.2025.100720","DOIUrl":"10.1016/j.gete.2025.100720","url":null,"abstract":"<div><div>The in-situ stress in plateau tunnels is significantly high and exhibits a complex distribution. Consequently, the long-term creep behavior of deep surrounding rock poses a critical challenge to the stability and integrity of tunnel engineering in plateau mountainous areas. To address this issue, this study performs triaxial creep tests on gneissic granite samples obtained from plateau tunnels under various stress paths. Additionally, the mechanical analysis is enhanced by incorporating acoustic emission characteristics and energy evolution. Two stress paths—continuous loading and confining pressure unloading—were implemented. Key parameters, including AE count, cumulative energy, and energy competition ratio <em>R</em>, were analyzed. The results indicate that: (1) Under the confining pressure unloading path, the accelerated creep stage duration,which just occupied 1.33 % of total loading time, was significantly shorter than that under continuous loading, with a 12.3 % reduction in failure strength, suggesting lower confinement facilitates microcrack propagation and rapid instability; (2) AE parameters and energy release patterns effectively characterized creep stages: steady-state creep exhibited steady AE activity, while abrupt increased in N and ΣE mark accelerated creep, with shear-dominated failure of over 69.9 %; (3) The energy competition ratio <em>R</em> grew exponentially beyond the critical deviatoric stress, though localized energy aggregation still triggered shear failure. This study elucidates how stress paths govern energy distribution and damage evolution, providing theoretical insights for stability assessment and disaster prevention in plateau tunnel engineering.</div></div>","PeriodicalId":56008,"journal":{"name":"Geomechanics for Energy and the Environment","volume":"43 ","pages":"Article 100720"},"PeriodicalIF":3.3,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144634529","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}

{"title":"Unified models for water permeability in hydrate-bearing sandy soil considering pore morphology evolution","authors":"Lin-Yong Cui ,&nbsp;Chao Zhou ,&nbsp;Sheng Dai","doi":"10.1016/j.gete.2025.100717","DOIUrl":"10.1016/j.gete.2025.100717","url":null,"abstract":"<div><div>The water permeability of hydrate-bearing sediments is of paramount importance for assessing the exploitation efficiency of methane hydrate from reservoirs. It is largely influenced by the interrelated factors of hydrate morphology and saturation. Experimental results revealed that as hydrate saturation increases, the pore morphology shifts from primarily grain-coating to predominantly pore-filling, but this coupling effect between hydrate morphology and saturation on water permeability is often overlooked in existing models. This study aims to model the water permeability of hydrate-bearing sandy soils, considering the evolution of pore morphology with changing hydrate saturation. An eccentric annulus is used to depict the pore structure of pore-filling hydrate, in contrast to the conventional unrealistic concentric annulus geometry. Two new models to describe water relative permeability were derived, each incorporating only a single parameter, assuming that grain-coating and pore-filling hydrates grow at different rates either sequentially or simultaneously. These models were validated using a dataset comprising 29 hydrate-bearing soils, with the hydrate saturations ranging from approximately 0 to 0.9. Comparison between model predictions and experimental data confirmed the good performance of both water permeability models, with low RMSE, MAE and GMV values of around 0.05, 0.03 and 1.28, respectively. Both models were further improved by correlating the two parameters with porosity data, which could ensure a rapid estimation of relative permeability based solely on porosity data without requiring any fitting parameters. Results in this study provide a novel perspective for understanding the impact of hydrate evolution on permeability reduction in hydrate-bearing soils.</div></div>","PeriodicalId":56008,"journal":{"name":"Geomechanics for Energy and the Environment","volume":"43 ","pages":"Article 100717"},"PeriodicalIF":3.3,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655434","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}

{"title":"Centrifuge modelling of energy geostructures in soil: A review","authors":"Rui Zhao ,&nbsp;Cong Shao ,&nbsp;Jonathan Adam Knappett ,&nbsp;Anthony Kwan Leung ,&nbsp;Teng Liang ,&nbsp;Liangtong Zhan ,&nbsp;Yunmin Chen","doi":"10.1016/j.gete.2025.100719","DOIUrl":"10.1016/j.gete.2025.100719","url":null,"abstract":"<div><div>Energy geostructures integrate heat exchange pipes of ground source heat pump systems within traditional underground structures, serving the dual purpose of extracting geothermal energy and supporting above-ground structures. The interaction between geothermal structures and soil involves heat transfer, pore pressure evolution and soil skeleton deformation, exhibiting a coupled thermo-hydro-mechanical response. Although detailed numerical and analytical models have been developed to analyze the thermo-hydro-mechanical behaviour of energy geostructures in soil, significant challenges remain in validating this coupled response. Centrifuge modelling provides prototype confining stresses in reduced-scale models, providing an alternative to field measurements with more controllable conditions and at lower cost. This paper reviews the current state of the art of centrifuge modelling of energy geostructure–soil interaction, with a particular focus on (i) scaling laws; (ii) evaluations of existing heating and cooling systems; (iii) soil modelling, including material selection and model preparation; and (iv) scale modelling of energy geostructural elements. Each section emphasizes the challenges of centrifuge modelling and presents identified solutions to these challenges. Finally, the prospect for future studies is discussed, highlighting the potential to enhance understanding of the underlying mechanisms controlling thermo-hydro-mechanical behaviour of geothermal structures in soil.</div></div>","PeriodicalId":56008,"journal":{"name":"Geomechanics for Energy and the Environment","volume":"43 ","pages":"Article 100719"},"PeriodicalIF":3.3,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144703677","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}

{"title":"Effect of particle size on mechanical properties of bio-cemented sand using enzyme-induced calcite precipitation","authors":"Qi-Wu Jiang ,&nbsp;Ming Huang ,&nbsp;Kai Xu ,&nbsp;Ming-Juan Cui ,&nbsp;Gui-Xiao Jin ,&nbsp;Xiao-Ping Zhang","doi":"10.1016/j.gete.2025.100718","DOIUrl":"10.1016/j.gete.2025.100718","url":null,"abstract":"<div><div>Enzyme-induced carbonate precipitation (EICP) has emerged as a promising eco-friendly biotechnology for soil stabilization. The mechanical properties of bio-cemented sands are largely determined by particle size characteristics. However, the influencing mechanism of particle size characteristics on bio-cemented sands remains unclear. In this study, a series of bio-cemented sand column tests were conducted to explore particle size effects. Different particle size (coarse, medium, fine) were treated with different numbers of cycles (6, 8, 10). Multiple key parameters of the bio-cemented sands were measured, including permeability, unconfined compressive strength (<em>UCS</em>), calcium carbonate content (<em>CCC</em>), and wave velocity. The SEM imaging technique was employed to demonstrate the impact of sand particle size on cementation effect in bio-cemented specimens. Linear relationships were established between wave velocity, permeability, <em>UCS</em>, and <em>CCC</em> with different particle size. The results showed that particle size significantly influences the <em>CCC</em>, <em>UCS</em>, wave velocity, and permeability of EICP-treated sands. Medium-grained sands exhibited the highest <em>UCS</em> and wave velocity under EICP treatment. This is attributed to medium sands can achieve a good balance between the efficiency of pore-filling by calcium carbonate crystals and the infiltration of the EICP solution. Fine sands suffered from inhomogeneous CaCO₃ distribution due to the clogging of pores, which hindered the uniform penetration of the EICP solution. Coarse sands showed limited cementation owing to oversized pores, which impeded the effective interparticle bonding mediated by precipitated calcium carbonate. These findings establish particle size thresholds for EICP efficacy, providing critical guidelines for particle size selection in field-scale biocementation projects.</div></div>","PeriodicalId":56008,"journal":{"name":"Geomechanics for Energy and the Environment","volume":"43 ","pages":"Article 100718"},"PeriodicalIF":3.3,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144662254","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}

{"title":"Thermal influence zone of energy tunnels in sandy soils under the hydrostatic condition","authors":"Alaaeldin Magdy ,&nbsp;Alice Di Donna ,&nbsp;Hussein Mroueh","doi":"10.1016/j.gete.2025.100716","DOIUrl":"10.1016/j.gete.2025.100716","url":null,"abstract":"<div><div>Energy geostructures are more and more considered as a possible solution to cover heating and cooling needs. They function according to the principle of shallow geothermal energy, exchanging heat with the ground. This results in a zone underground where the temperature of the ground is affected by the presence of the geothermal system, which is called thermal influence zone. As the number of energy geostructures increases, determining their thermal influence zone becomes crucial, especially in environments where adjacent energy geostructures or other geothermal systems coexist. Indeed, avoid or minimize the overlap between the thermal influence zones of different geothermal installations is important to ensure their efficiency. This study investigates the effects of groundwater level, thermal operation period, and ground permeability, in both heating and cooling modes, on the thermal influence zone generated around an energy tunnel. The results indicate that the thermal induced change in groundwater density and viscosity due to geothermal operations generates groundwater circular flows. These flows play a major role in shaping the thermal influence zone. In the heating mode (winter), when the groundwater is within the vicinity of the tunnel, i.e., above, at or just below the tunnel, the thermal influence zone takes an oval shape elongated below the tunnel invert. In the cooling mode (summer), the thermal influence zone does not follow a specific shape, and it is remarkably changed by the groundwater level. For instance, when the groundwater level is shallow, the thermal influence zone extends significantly upward, potentially overlapping with the surface layer affected by atmospheric air temperature. However, when the groundwater level at the tunnel centreline, the thermal influence zone takes a horizontal oval shape, which might interfere with adjacent similar installations. The expansion of the thermal influence zone is highly dependent on the operation duration. In winter, the downward elongation after 6 months operation reaches around 1.5 times that after 3 months.</div></div>","PeriodicalId":56008,"journal":{"name":"Geomechanics for Energy and the Environment","volume":"43 ","pages":"Article 100716"},"PeriodicalIF":3.3,"publicationDate":"2025-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144670356","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}

{"title":"Coupled hydro–mechanical simulation of the interaction between adjacent lined rock caverns subject to internal gas pressurisation","authors":"Chenxi Zhao ,&nbsp;Zixin Zhang ,&nbsp;Qinghua Lei","doi":"10.1016/j.gete.2025.100701","DOIUrl":"10.1016/j.gete.2025.100701","url":null,"abstract":"<div><div>We develop a two-dimensional (2D) fully-coupled hydro–mechanical model to study the performance of gas pressurised adjacent lined rock caverns (LRCs) in water-saturated fractured rock masses. The 2D model represents the horizontal cross-section of LRCs and their surrounding rock masses subjected to various in-situ stress and pore pressure conditions. We explore different LRC operational scenarios, including a double cavern configuration with one cavern or both caverns under gas filling. We analyse the evolution of damage in both the rock mass and concrete lining, as well as tangential strain in the concrete and steel linings. Our simulation results indicate that damage in the rock mass develops in the form of wing cracks from pre-existing fracture tips while damage in the concrete lining is primarily induced by tensile cracking under cavern pressurisation. Pore pressure varies significantly in the surrounding rock mass during the cavern pressurisation, leading to pronounced damages. Among the different operational conditions explored in this study, we find that the configuration with one cavern under pressurisation while the other at a low initial/residual gas pressure can reach a higher gas infilling pressure, due to the higher compliance of the system. The insights gained from our study have important implications for optimising the design and performance of LRCs for sustainable underground hydrogen storage.</div></div>","PeriodicalId":56008,"journal":{"name":"Geomechanics for Energy and the Environment","volume":"43 ","pages":"Article 100701"},"PeriodicalIF":3.3,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144605871","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}

{"title":"Hydromechanical simulation of argillaceous rocks: From laboratory tests to drift excavation","authors":"Davood Yazdani Cherati ,&nbsp;Jean Vaunat ,&nbsp;Antonio Gens Solé ,&nbsp;Carlos Plua ,&nbsp;Minh Ngoc Vu ,&nbsp;Gilles Armand","doi":"10.1016/j.gete.2025.100714","DOIUrl":"10.1016/j.gete.2025.100714","url":null,"abstract":"<div><div>This study aims to evaluate the role of the pre-peak hardening regime in an elasto- viscoplastic model for argillaceous rocks, called the argillite model, use the model to replicate the hydromechanical response of argillaceous rocks observed in both laboratory and field tests, and investigate the interactions between excavation supports and these geomaterials. Initially, the impacts of the pre-peak strain hardening regime on behavior of argillaceous rocks are investigated through modeling a series of theoretical biaxial tests. Afterward, the model is validated by simulating biaxial and triaxial tests conducted on Beaucaire marl and Callovo-Oxfordian (COx) clay samples, respectively. Additionally, the role of the hardening regime in capturing the dependence of strain at peak strength on confining pressure is demonstrated using the triaxial models. Next, the effects of the hardening regime on the hydromechanical response of argillaceous rocks to drift excavations are demonstrated by modeling GCS drift, excavated within the Meuse/Haute-Marne Underground Research Laboratory (MHM URL). Subsequently, the argillite model is employed to simulate three other supported and unsupported drifts, excavated within the MHM URL. Finally, the long-term failure pattern of the concrete lining is predicted. Results indicate that incorporating the hardening regime and support effects can significantly enhance the accuracy of the model predictions.</div></div>","PeriodicalId":56008,"journal":{"name":"Geomechanics for Energy and the Environment","volume":"43 ","pages":"Article 100714"},"PeriodicalIF":3.3,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655435","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}

{"title":"Stability analysis of compressed air energy storage in underground space: A comparative research of coal mine roadway and salt cavern","authors":"Jinyang Fan ,&nbsp;Pengyu Guo ,&nbsp;Yifan Wang ,&nbsp;Zongze Li ,&nbsp;Yang Zou ,&nbsp;Deyi Jiang ,&nbsp;Daniel Nelias","doi":"10.1016/j.gete.2025.100715","DOIUrl":"10.1016/j.gete.2025.100715","url":null,"abstract":"<div><div>The application of Compressed Air Energy Storage (CAES) in large-scale projects offers a promising solution for mitigating fluctuations in renewable energy generation. Focusing on the CAES project in Yungang coal mine, Datong, Shanxi, this study qualitatively and quantitatively investigated the impact of creep and cyclic loading on the roadway under various CAES operating frequencies. Stability indicators for Compressed Air Energy Storage Roadways (CAES-R), including displacement contours, roof subsidence, volume shrinkage, etc., were compared at different CAES operating frequencies, and the stability of CAES-R was compared to salt cavern CAES. Results reveal that higher CAES operating frequencies correspond to lower roadway deformation and plastic damage. After ten years of simulation with daily operation frequency, roof subsidence reaches approximately 20 mm, with a volume shrinkage of 0.76 %. Under the reduced frequency of once every 10 days, roof subsidence reaches 33 mm and volume shrinkage 1.05 % after ten years. Junction sections exhibited greater deformation than non-junction sections, demonstrating higher susceptibility to structural failure. Most deformation and damage occur rapidly during early operation stages, accumulating more slowly thereafter. A novel comparative analysis between CAES-R and traditional salt cavern CAES indicates CAES-R reservoirs exhibit significantly lower volumetric shrinkage rates and smaller plastic zones than the comparative study. Taking various factors into consideration, CAES-R also has better prospects than salt cavern CAES. It should be noted that the general applicability of these findings requires further site-specific evaluation due to geological heterogeneity and operational constraints.</div></div>","PeriodicalId":56008,"journal":{"name":"Geomechanics for Energy and the Environment","volume":"43 ","pages":"Article 100715"},"PeriodicalIF":3.3,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144605870","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}

{"title":"Surface–subsurface flow effect on earthen dikes geomechanical stability during overtopping event","authors":"Nathan Delpierre,&nbsp;Hadrien Rattez,&nbsp;Sandra Soares-Frazão","doi":"10.1016/j.gete.2025.100709","DOIUrl":"10.1016/j.gete.2025.100709","url":null,"abstract":"<div><div>Droughts and extreme precipitation events, exacerbated by climate change, are causing growing threats to earthen dams. The increasing frequency of extreme events, which were not always considered when these earthen structures were built means that these factors may not have been fully accounted for in their design. The risk of overtopping flow is therefore increased and the initial soil’s saturation level has a significant impact on the structure’s strength that should not be overlooked during the assessment of the dike risk of failure when overtopped. In this paper, we present a novel numerical framework that consists in a physically-based approach which allows to study the effects of combined surface–subsurface flows on the slope stability evolution, using an effective stress formulation for the mechanical analysis. The surface flows are described using a one-dimensional shallow-water equations solver and are coupled in a conservative way with the subsurface flow, through a two-dimensional Richards equation solver. The shear strength reduction method is employed, in combination with an effective stress approach, to assess the longitudinal and lateral slope safety factor evolution taking into account the pore-pressure and saturation degree changes in time during overtopping.</div></div>","PeriodicalId":56008,"journal":{"name":"Geomechanics for Energy and the Environment","volume":"43 ","pages":"Article 100709"},"PeriodicalIF":3.3,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144563911","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}