Geomechanics for Energy and the Environment最新文献

{"title":"Effect of multifractal characteristics of pore structure in coal adsorbed by low pressure gas on thermal conductivity and thermal diffusion","authors":"Xiuming Jiang ,&nbsp;Caifang Wu ,&nbsp;Xiaojie Fang ,&nbsp;Yi Cheng","doi":"10.1016/j.gete.2025.100666","DOIUrl":"10.1016/j.gete.2025.100666","url":null,"abstract":"<div><div>Thermal conductivity and thermal diffusivity are critical physical properties influencing safe mining operations, geothermal field studies, and underground coal gasification technologies. This study investigates the pore structure and multifractal characteristics of coal with varying metamorphic degrees in southwest China using low-pressure N₂ and CO₂ adsorption techniques. The thermal conductivity and diffusivity of coal samples were measured using the transient plane source method. Furthermore, we analyzed the relationship between multifractal parameters and the thermal properties of coal. Our results indicate a weak correlation between industrial parameters and the thermal properties of coal. We found that the pore volume and specific surface area of intermediate pores in coal are positively correlated with thermal conductivity and negatively correlated with thermal diffusivity. Both thermal conductivity and diffusivity increase with the pore volume and specific surface area. Multifractal self-similarity analysis reveals that coal samples exhibit strong multifractal characteristics, with micropores displaying stronger multifractal features than intermediate pores. The distribution of pores in coal primarily influences thermal conductivity and diffusivity, whereas the structure and complexity of the pores themselves have a negligible effect compared to pore uniformity.</div></div>","PeriodicalId":56008,"journal":{"name":"Geomechanics for Energy and the Environment","volume":"42 ","pages":"Article 100666"},"PeriodicalIF":3.3,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683855","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":"Three-dimensional elastoplastic modelling for deformation property of sandstone with dilatancy","authors":"Jiacun Liu ,&nbsp;Xing Li ,&nbsp;Ying Xu ,&nbsp;Kaiwen Xia","doi":"10.1016/j.gete.2025.100665","DOIUrl":"10.1016/j.gete.2025.100665","url":null,"abstract":"<div><div>Due to the development of plastic strains, the strain path within the meridian plane deviates from the reference line corresponding to elastic state. Similarly, under true triaxial stress conditions, the strain path within the deviatoric plane deviates from the reference line corresponding to the constant Lode angle. This deviation is attributed to the plastic shear strain associated with the Lode angle. To account for these phenomena, a novel three-dimensional elastoplastic constitutive model incorporating Lode angle is proposed to characterize the deformation behavior of sandstone. The yield and potential functions within this model incorporate parameters that vary with the plastic internal variable, enabling the evolution of the yield and plastic potential surfaces in both the meridian and deviatoric planes. The comparison between experimental data and the analytic solution derived from the constitutive model validates its reliability and accuracy. To examine the differences between yield surface and plastic potential surface, a comparison between the associated and non-associated flow rules is conducted. The results indicate that the associated flow rule tends to overestimate the dilatancy of sandstone. Furthermore, the role of Lode angle dependence in the potential function is explored, highlighting its importance in accurately describing the rock's deformation.</div></div>","PeriodicalId":56008,"journal":{"name":"Geomechanics for Energy and the Environment","volume":"42 ","pages":"Article 100665"},"PeriodicalIF":3.3,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698121","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":"Study on novel alkali-activated cementitious grout for scour control of offshore foundation","authors":"Fei Sha ,&nbsp;Yulong Dong ,&nbsp;Shijiu Gu ,&nbsp;Xiaochen Fan ,&nbsp;Wenwen Xiao","doi":"10.1016/j.gete.2025.100663","DOIUrl":"10.1016/j.gete.2025.100663","url":null,"abstract":"<div><div>To address scour hazards surrounding offshore foundations, a new method employing novel alkali-activated cementitious grout (AACG) has been proposed for improvement of seabed soil. Ground granulated blast-furnace slag (GGBFS) was replaced by fly ash (FA), steel slag (SS) or FA + SS to prepare precursors, the replacement amounts were 10 %, 20 %, 30 % and 40 %. Fresh-state and mechanical properties, minerals and microstructures were investigated. A novel scour simulation test device was developed to simulate engineering conditions of scour and remediation. Flow-soil coupled scour resistance tests were conducted, shear tests and SEM measurements of solidified soil were carried out. The results showed that the optimal ratio of GGBFS:FA:SS was 6:2:2 for AACG. The optimized AACG has better fluidity and lower brittleness, and its 28 d unconfined compressive strength (UCS) achieves 13.5 MPa. For AACG solidified soil, the maximum scour depth was reduced by 33.3 % and the maximum sediment transport amount was decreased by 53.2 %, which were compared to those of cement - sodium silicate (C-S) double slurry. Moreover, the increase degrees of internal friction angle, cohesion and critical shear stress were 700 %, 7.9 % and 786 %, respectively. The scour resistance of AACG solidified soil was superior. The inherent relationship between UCS and critical shear stress was discussed. UCS can be used to rapidly assess the scour resistance of consolidated soil. This study introduced an eco-friendly AACG as an innovative stabilizer for soil reinforcement around offshore structural foundations, offering significant application and environmental values for scour control.</div></div>","PeriodicalId":56008,"journal":{"name":"Geomechanics for Energy and the Environment","volume":"42 ","pages":"Article 100663"},"PeriodicalIF":3.3,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143629224","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":"Designing a repository in domal salt: The influence of design variants in different modelling environments","authors":"Jeroen Bartol ,&nbsp;Dirk-Alexander Becker ,&nbsp;Steven Benbow ,&nbsp;Alexander Bond ,&nbsp;Tanja Frank ,&nbsp;Tara LaForce ,&nbsp;Josh Nicholas ,&nbsp;Richard Jayne ,&nbsp;Philip H. Stauffer ,&nbsp;Emily Stein ,&nbsp;Jodie Stone ,&nbsp;Jens Wolf","doi":"10.1016/j.gete.2025.100659","DOIUrl":"10.1016/j.gete.2025.100659","url":null,"abstract":"<div><div>To understand the long-term environmental impact of disposing radioactive waste of in a deep geological repository and to optimise its design, performance assessments are used. In this study, four teams (COVRA, GRS, Quintessa, and DOE) modified the previously developed generic repository of DECOVALEX task F2 to identify commonalities and differences between the teams for specific changes in repository design. The teams tested six design modifications: (1) Replacing concrete abutments with run-of-mine salt; (2) Replacing the salt seal with a concrete abutment and using run-of-mine salt instead for the two concrete abutments in each drift seal; (3) Halving the size of the infrastructure area; (4) Using run-of-mine salt instead of gravel for backfilling the infrastructure area; (5) Disposal of spent nuclear fuel without the POLLUX-10 containers (6); Lower initial saturation of the spent nuclear fuel and vitrified waste disposal drifts. Despite different modelling strategies used, models agreed that a smaller infrastructure area has a limited effect on radionuclide transport. Responses to the absence of the two concrete abutments in each seal, the use of single large concrete abutments (200 m each), or the use of run-of-mine salt in the infrastructure area differ between teams due to differing modelling assumptions. Based on these results, the estimated efficacy of containment depends strongly on the model assumptions of each team. More specifically, it appears to depend on the compaction model used and therefore on the backfill material used in different areas of the repository. However, the drift seal appears to be a critical design element in all models, effectively limiting radionuclide transport by hydrologically disconnecting sections of the repository. Additional beneficial design choices include the use of dry salt in disposal drifts to limit radionuclide transport and reducing the infrastructure area costs and minimizing host rock damage.</div></div>","PeriodicalId":56008,"journal":{"name":"Geomechanics for Energy and the Environment","volume":"42 ","pages":"Article 100659"},"PeriodicalIF":3.3,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143637805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study of evaporation from soil-atmosphere interfaces","authors":"Jaime E. Granados ,&nbsp;Catalina Lozada ,&nbsp;Bernardo Caicedo","doi":"10.1016/j.gete.2025.100658","DOIUrl":"10.1016/j.gete.2025.100658","url":null,"abstract":"<div><div>Experimental evaporation tests on 2–20 mm soil samples were performed under a wide range of atmospheric conditions using a climatic chamber. The relatively thin thickness of the samples was intended to represent the soil-atmosphere interface layer. Atmospheric conditions of wind velocity, air temperature, relative humidity and irradiance were imposed on bare soil surfaces of sand, compacted clay and kaolin slurry. The results of an extensive number of experimental tests show a good correlation between the atmospheric conditions measured near the soil surface and Potential Evaporation (PE) and soil initial evaporation rates. An empirical model based on an inverse sigmoid function is proposed to express the ratio between Actual Evaporation (AE) and Potential Evaporation (AE/PE) rates versus soil suction. The evaporation results of the present study may be used to predict PE and AE rates from soil surfaces of different textures under a broad range of environmental conditions. The empirical model may be used in soil-atmosphere interaction models to estimate water flux across soil-atmosphere boundaries.</div></div>","PeriodicalId":56008,"journal":{"name":"Geomechanics for Energy and the Environment","volume":"42 ","pages":"Article 100658"},"PeriodicalIF":3.3,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644529","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":"Settlement analysis in the context of underground climate change","authors":"Anjali N. Thota,&nbsp;Alessandro F. Rotta Loria","doi":"10.1016/j.gete.2025.100662","DOIUrl":"10.1016/j.gete.2025.100662","url":null,"abstract":"<div><div>Subsurface urban heat islands are a pressing global issue responsible for an underground climate change beneath cities. Over the past two decades, this phenomenon has been identified as a threat to subsurface ecosystems, hydrogeological systems, transportation systems, and public health. Recently, underground climate change has also been reported as a silent hazard for civil infrastructure due to thermally induced ground deformations. This paper expands the study of the impacts of underground climate change on civil infrastructure by presenting a simplified, one-dimensional settlement analysis that simulates the deformations driven by subsurface urban heat islands as a viscous process driven by thermally accelerated creep. Specifically, this investigation focuses on the vertical displacements of the ground surrounding a caisson foundation supporting a 39-storey building located in the Chicago Loop district under the influence of underground climate change for 100 years. The results reveal that the thermally induced ground displacements caused by underground climate change can be substantial and strongly depend on the ground warming rate and the spatial extent of subterranean temperature variations. The study provides new evidence about the relevance of underground climate change for the serviceability performance of civil infrastructure, motivating future research to identify which types of earth-contact structures and infrastructures may be particularly affected by thermally induced ground deformations caused by this phenomenon.</div></div>","PeriodicalId":56008,"journal":{"name":"Geomechanics for Energy and the Environment","volume":"42 ","pages":"Article 100662"},"PeriodicalIF":3.3,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619897","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":"The influence of hydrating mineral components on wellbore sealing capacity of salt-plugged wells","authors":"Suzanne J.T. Hangx,&nbsp;Timotheus K.T. Wolterbeek ,&nbsp;Max J. Bruggeman ,&nbsp;Oliver Plümper","doi":"10.1016/j.gete.2025.100661","DOIUrl":"10.1016/j.gete.2025.100661","url":null,"abstract":"<div><div>Rock salt forms an important hydrocarbon caprock and a source for salt (solution) mining. With many associated wells approaching the end of their lifetime, effective <em>Plugging &amp; Abandonment</em> strategies are required. At the same time, as the energy transition progresses, many new wells will likely be drilled for specific use during geological CO₂ storage or temporary hydrogen storage. These wells, too, will eventually need to be plugged and abandoned safely. We investigated the sealing effectiveness of a potential alternative for Portland cement as plugging material, consisting of a mixture of metal oxides (CaO, MgO) and salt (NaCl), wherein hydration leads to significant volumetric expansions. In 11 out of 17 flow-through experiments, the apparent plug permeability fell to 10⁻¹⁷–10⁻¹⁸ m² upon hydration, under differential pressures of 0.2–1.8 MPa. One CaO:NaCl sample could withstand up to 2 MPa differential pressure across its 5-cm-length, attaining a minimum apparent permeability of 10⁻²¹ m². Apparent plug permeability correlated closely with the expected final solid volume fraction, i.e., the amount of void space remaining. Upscaling to realistic wellbore dimensions (10–100 m) suggests that expanding metal oxide-salt plugs set in steel casing could withstand differential pressures of 3.6–40 MPa/m. For evaporitic caprocks, this implies that metal oxide-salt plugs can be a potential alternative to conventional Portland cement, ensuring plug closure and potentially sealing within several hours. However, sealing highly depends on the amount of metal oxide available and the volume of void space requiring closure.</div></div>","PeriodicalId":56008,"journal":{"name":"Geomechanics for Energy and the Environment","volume":"42 ","pages":"Article 100661"},"PeriodicalIF":3.3,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143637806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantitative assessment of rock plane replica orientation detection and extraction methods under controlled experimental conditions","authors":"Nirandoal Cheng ,&nbsp;Tan Yon Ken ,&nbsp;Mohd Ashraf Mohamad Ismail ,&nbsp;Fatin Nadhirah Ahmad Pauzi ,&nbsp;Nursyahirah Mohd Saleh ,&nbsp;Yasuhiro Yokota","doi":"10.1016/j.gete.2025.100649","DOIUrl":"10.1016/j.gete.2025.100649","url":null,"abstract":"<div><div>The characterization of discontinuous rock mass properties is essential for understanding the behaviour of rock masses in various engineering applications, such as tunnelling, mining, and slope stability analysis. This study presents an innovative approach for detecting and extracting the orientations of discontinuous rock plane replicas using image analysis techniques. The image analysis technique employed in this research involves the use of advanced algorithms in Agisoft Metashape to process digital dense point clouds, enabling the identification of discontinuities and the extraction of dip and dip direction in CloudCompare software. The performance of the image analysis technique was evaluated using the Root Mean Square Error (RMSE) for dip and dip direction measurements. The RMSE values were 1.97 for dip and 2.34 for dip direction, indicating high accuracy and reliability in-plane detection. Additionally, the range of differences observed was within 5 degrees for dip and within 13 degrees for dip direction. These results support the interpretation of RMSE, highlighting the sensitivity of dip direction in image analysis.</div></div>","PeriodicalId":56008,"journal":{"name":"Geomechanics for Energy and the Environment","volume":"42 ","pages":"Article 100649"},"PeriodicalIF":3.3,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143600524","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":"Impact of flow direction and soil characteristics on suffusion susceptibility: Analyzing soil resistance and filtration effects","authors":"Dinh Minh Tran ,&nbsp;Didier Marot ,&nbsp;Fateh Bendahmane ,&nbsp;Rachel Gelet","doi":"10.1016/j.gete.2025.100657","DOIUrl":"10.1016/j.gete.2025.100657","url":null,"abstract":"<div><div>Most suffusion tests described in the literature are performed by applying a vertical flow to homogenous specimens, whereas on site, the flow can be in another direction and the soil may display local variations of density and grain size distribution. A series of suffusion tests are performed with a multi-direction flow device, under vertical or horizontal flow. Two cohesionless soils which slightly differ by their grain size distribution and density are tested. Specimens are either composed of a single soil or bi-layered, i.e. a layer of each soil. The suffusion susceptibility is characterized by two critical hydraulic gradients and an erosion resistance index. With the current testing procedure, the influence of the local density variations on the suffusion susceptibility is not significant. The results show that under horizontal flow, each tested soil becomes more heterogeneous, but also slightly more resistant towards suffusion. When considering bi-layered specimens and a flow parallel to the soil interface, the suffusion susceptibility is mainly controlled by the most erodible soil. On the other hand, when the flow is perpendicular to the soil interface, the suffusion susceptibility is mainly controlled by the most resistant soil. The results also highlight the influence of pore opening on the filtration and the selection of the pore opening of the downstream filter is discussed<strong>.</strong></div></div>","PeriodicalId":56008,"journal":{"name":"Geomechanics for Energy and the Environment","volume":"42 ","pages":"Article 100657"},"PeriodicalIF":3.3,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143600523","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":"Analysis of short- and long-term coupled THM behaviours in argillaceous rock for nuclear waste disposal","authors":"Fei Song ,&nbsp;Antonio Gens ,&nbsp;Stefano Collico ,&nbsp;Carlos Plúa ,&nbsp;Gilles Armand ,&nbsp;Huaning Wang","doi":"10.1016/j.gete.2025.100660","DOIUrl":"10.1016/j.gete.2025.100660","url":null,"abstract":"<div><div>Deep geological disposal is recognised as the most feasible method for the management of High-level Nuclear Waste (HLW). This study involved the performance of numerical analyses to evaluate the short- and long-term Thermo-Hydro-Mechanical (THM) behaviour of HLW disposals at the repository scale. A far-field numerical model is analysed, considering geological profiles 1000 m deep from the surface. In the analyses, an elasto-viscoplastic constitutive model is employed to characterize the behaviour of the argillaceous host rock, taking into account hardening-softening behaviour, anisotropy of THM properties, as well as permeability variation due to damage. Generalized Darcy’s law and Fourier’s law are utilized to represent the liquid and heat fluxes, respectively. Wide-ranging parametric analyses are performed to investigate the effect of spacing between parallel microtunnels and of different multi-physics interactions on the evolution of THM behaviour at the repository scale. Variations in spacing significantly impact the temperature and pore pressure fields, which in turn influence the development of potential damage zones. An enhanced understanding of the THM mechanisms associated with the short-term and long-term stability of nuclear waste disposals has been achieved in this study, therefore, providing valuable insights for the design and optimization of the geological repositories.</div></div>","PeriodicalId":56008,"journal":{"name":"Geomechanics for Energy and the Environment","volume":"42 ","pages":"Article 100660"},"PeriodicalIF":3.3,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610035","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}