International Journal of Rock Mechanics and Mining Sciences最新文献

{"title":"Influence of stress heterogeneity on shear behavior of rock discontinuities in laboratory experiments: New insights from numerical simulations","authors":"Shupeng Chai ,&nbsp;Yuan Zou ,&nbsp;Huanyu Wu ,&nbsp;Mohammadreza Akbariforouz ,&nbsp;Boyang Su ,&nbsp;Giovanni Grasselli ,&nbsp;Derek Elsworth ,&nbsp;Yossef H. Hatzor ,&nbsp;Qi Zhao","doi":"10.1016/j.ijrmms.2025.106358","DOIUrl":"10.1016/j.ijrmms.2025.106358","url":null,"abstract":"<div><div>Laboratory shear tests are widely used to investigate the evolution of first and second-order frictional behavior and rupture nucleation on rock discontinuities. Average stress across the sample, instead of spatial stress distributions, is typically assumed in analysis. We provide a thorough numerical investigation of eight common laboratory shear test configurations, considering a linear velocity-weakening friction law on a planar sliding surface, to quantify the temporal and spatial nonuniformity of stress both before shear and during stick-slip cycles. Our results indicate that non-uniform stress distribution resulting from the test configuration exists in all laboratory shear tests, with stress concentration occurring at the edges of the shear plane, while the stress in the central portion of laboratory faults remains almost uniform. Stress heterogeneity is more pronounced in direct shear than in inclined and rotary shear configurations. During stick-slip cycles, the local shear stress significantly dropped as the rupture front propagated through, resulting in a more uniform stress distribution in the slip phase than in the stick phase. Stress concentration near the sample edge governs the rupture process and the resulting localization of damage. These findings highlight the importance of considering stress heterogeneity in laboratory investigations of damage evaluation on rock discontinuities. We suggest that test configuration-related stress heterogeneity should be distinguished from surface roughness-induced stress heterogeneity, and utilizing average stress may lead to misinterpretation of the rupture dynamics and damage patterns. Our results provide a guide on quantitative analysis of the shear behavior of rock discontinuities, considering stress heterogeneity in laboratory experiments.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"197 ","pages":"Article 106358"},"PeriodicalIF":7.5,"publicationDate":"2025-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614045","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}

{"title":"FisTopNet: A deep learning framework for automated estimation of evolving rock fracture network topology from image sequences","authors":"Liangchen Zhao ,&nbsp;Yixin Zhao ,&nbsp;Xinze Li ,&nbsp;Zhe Yang ,&nbsp;Jihong Guo ,&nbsp;Hua Bian","doi":"10.1016/j.ijrmms.2025.106361","DOIUrl":"10.1016/j.ijrmms.2025.106361","url":null,"abstract":"<div><div>Rock fracture networks have a major impact on rock mass mechanical behavior, and their accurate characterization is important for various engineering disciplines. However, traditional manual topological analysis of these networks suffers from subjectivity and inefficiency, limiting its application, particularly for dynamic fracture processes. This study bridges this fundamental gap by introducing FisTopNet, a novel deep learning approach for direct and automated estimation of fracture network topology from image sequences. FisTopNet employs a multi-task learning architecture to perform semantic segmentation of fractures, fracture edge detection, and the extraction of the fracture topological graph, including its constituent nodes and connecting branches. Proposed FisTopNet utilizes the temporal information in the image sequences and takes into account the dynamic evolution of the fracture network thereby improving the accuracy of topology estimation. Furthermore, we constructed and meticulously annotated a unique dataset comprising image sequences from uniaxial compression tests on rock samples, featuring ground truth labels for semantic segmentation, edge detection, and evolving fracture network topology. Extensive experiments demonstrate FisTopNet's superior performance over established baseline methods. FisTopNet achieved an Intersection over Union (IoU) of 88.14 % and a Topological Similarity of 96.48 %. The IoU score, which quantifies the overlap between predicted and ground truth areas, represents a 12.74 % improvement over the leading competitor, SegFormer. Furthermore, Topological Similarity, an index evaluating the consistency of network connectivity, represents a 1.63 % improvement over the HRNet. In addition, ablation studies further validate the importance of the multi-task design and the temporal processing module. Moreover, our approach proficiently characterized the three-stage evolution of fracture topology and revealed strong correlations between dynamic topological parameters and macroscopic rock mechanical behavior, such as failure mode and peak stress. By leveraging FisTopNet, we propose a robust and automatic methodology for analyzing dynamic fracture processes, thereby facilitating a greater insight into rock failure mechanisms and enhancing engineering design and hazard assessment, with potential applications in geothermal energy extraction, CO₂ geological sequestration, and stability analysis for underground mining and civil engineering projects.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"197 ","pages":"Article 106361"},"PeriodicalIF":7.5,"publicationDate":"2025-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145611883","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}

{"title":"Experimental study on triaxial fatigue properties of mudstone interlayers in CAES under synergistic effects of stress amplitude and time interval","authors":"Jinjie Suo ,&nbsp;Jinyang Fan ,&nbsp;Deyi Jiang ,&nbsp;Arezoo Rahimi ,&nbsp;Daniel Nelias ,&nbsp;Zhenyu Yang ,&nbsp;Zongze Li","doi":"10.1016/j.ijrmms.2025.106360","DOIUrl":"10.1016/j.ijrmms.2025.106360","url":null,"abstract":"<div><div>This study investigates the fatigue behavior of mudstone under cyclic triaxial loading conditions, with a focus on the effects of stress amplitude and confining pressure relevant to underground Compressed Air Energy Storage (CAES) operations. Graded triaxial intermittent fatigue tests (GTIF) were conducted to simulate the stress path of intermittent loading. The results show that the fatigue life of mudstone exhibits a non-monotonic dependence on confining pressure: the longest life occurs at 3 MPa, while higher confining pressures (6–12 MPa) cause a pronounced reduction followed by a plateau, indicating a threshold-like confinement effect. The elastic modulus decreases with increasing stress amplitude but, at a given stress ratio, increases with confining pressure, reflecting a trade-off between stress-induced damage and confinement-enhanced stiffness. Residual strain behavior was found to depend on the stress limit interval pattern: upper limit intervals led to reduced residual strain post-rest, whereas lower limit intervals caused strain reversal due to internal stress relaxation. These trends reveal that the loading history significantly influences deformation recovery and potential damage evolution. The damping ratio decreased with increasing confining pressure but increased with stress amplitude, implying that while confining pressure suppresses internal defect activity, higher stress promotes energy dissipation through microcracking. Dissipated energy showed distinct patterns under different loading modes: it increased with stress ratio but decreased with cycle number, highlighting the fatigue softening effect. Interestingly, confining pressure enhanced energy dissipation in upper-limit loading but reduced it under lower-limit conditions. Overall, these results clarify how confining pressure, stress amplitude, and loading intervals jointly govern fatigue life, residual strain, and energy dissipation in mudstone interlayers, and identify measurable damage indicators that can support safer mechanical design and long-term performance assessment of CAES in layered geological formations.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"197 ","pages":"Article 106360"},"PeriodicalIF":7.5,"publicationDate":"2025-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145609208","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}

{"title":"Impact of mineralogical features on the mechanical behaviors of granite: A study using physically informed 3D microstructural model","authors":"Changdi He ,&nbsp;Brijes Mishra ,&nbsp;David Oskar Potyondy","doi":"10.1016/j.ijrmms.2025.106355","DOIUrl":"10.1016/j.ijrmms.2025.106355","url":null,"abstract":"<div><div>Mineralogical features, including mineral spatial distribution, shape, and orientation, are important in determining the mechanical behaviors of granite. This effect was investigated by using the X-ray micro-computed tomography (micro-CT) scan on granite specimens (10 mm diameter and 15 mm height) before and after uniaxial compressive strength (UCS) testing. The X-ray micro-CT scan generated thousands of CT images, which were processed using advanced digital image processing (DIP) techniques. Specifically, the Residual Network–Visual Geometry Group16–UNet (Res–VGG16–UNet) model and the circular threshold segmentation technique were applied to identify and map minerals within the CT images. The coordinate information extracted from these mapped minerals was then used to create 3D Subspring Network Breakable Voronoi (SNBV) microstructural models that incorporate the mineral characteristics of tested granite specimens. The models consist of a mesh (3D Voronoi tessellation) of rigid, breakable, Voronoi blocks. The extracted coordinate information, forming a large dataset, was managed by the <span><math><mi>k</mi></math></span>-Dimensional Tree (KD-Tree) algorithm to facilitate mineral type assignment in SNBV models. The models were calibrated by comparing their results with the experimental data obtained from UCS tests. This study further explored the variations in biotite grain spatial distribution, shape, and orientation within a calibrated SNBV model, and examined their impact on the UCS and fracture behaviors of granite, based on a set of simplified microproperties. The results illustrate that as the SNBV model resolution (defined by the number of rigid blocks contained in models with identical physical dimensions) increases, mechanical properties, including UCS and crack initiation and damage strains and stresses, reach constant values. Additionally, the spatial distribution, shape, and orientation of biotite grain affect the UCS of granite, while their effect on the failure strain is minimal. The aspect ratio of biotite grains affects UCS, with <span><math><mi>z</mi></math></span>-axis elongation (aligned with compression) yielding higher UCS than <span><math><mi>x</mi></math></span>-axis elongation (perpendicular to compression).</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"197 ","pages":"Article 106355"},"PeriodicalIF":7.5,"publicationDate":"2025-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145598600","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}

{"title":"Experimental assessment of mode I fracture toughness and fracture energy in four rock types using the pCT testing method with two notch radii","authors":"Yan Li ,&nbsp;Miguel Herbón-Penabad ,&nbsp;Jorge Castro ,&nbsp;Marina Miranda ,&nbsp;Tonglu Li ,&nbsp;Jordi Delgado-Martín","doi":"10.1016/j.ijrmms.2025.106352","DOIUrl":"10.1016/j.ijrmms.2025.106352","url":null,"abstract":"<div><div>Understanding mode I fracture behavior in rocks is essential for handling geomechanical problems, including tunneling, mining, and hydraulic fracturing. This study investigates the mode I fracture toughness (<em>K</em>_IC) and specific fracture energy (<em>G</em>_c and <em>G</em>_f) in one sandstone, one limestone and two marble lithologies using the pseudo-compact tension (<em>p</em>CT) test. To assess the influence of the notch radius, specimens were prepared with two notch radii: 0.15 mm (thin) and 0.5 mm (thick). The key novelty lies in comparing notch radius effects across multiple lithologies while explicitly accounting for heterogeneity via ultrasonic wave velocities and micro X-ray fluorescence elemental mapping. Results show that, for the limestone and the marbles, the thick notch yields higher values of <em>K</em>_IC, <em>G</em>_c, <em>G</em>_f. In contrast, the sandstone shows the opposite trend, with higher values for thin-notch specimens. This behavior is likely attributed to its high porosity, where stress concentration around pores can generates secondary crack tips near the blunt notch tip, that reduce the fracture toughness and energy dissipation. Across all rocks, <em>G</em>_f &gt; <em>G</em>_c, indicating substantial dissipation by microcracking and grain-boundary processes beyond pure surface-energy creation. In addition, a thinner notch improves repeatability and reduces data dispersion, thereby mitigating heterogeneity effects on measured parameters. These findings provide practical guidance on selection of notch radius and highlight the importance of multiscale heterogeneity characterization for advancing rock mechanics research and refining fracture testing methods, thereby improving accuracy and reducing variability.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"197 ","pages":"Article 106352"},"PeriodicalIF":7.5,"publicationDate":"2025-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145598601","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}

{"title":"Investigation of the time-dependent and dynamic geomechanical behaviors induced by depressurization in natural gas hydrate-bearing sediments based on a poro-elasto-viscoplastic-dynamic model","authors":"Xuyang Guo ,&nbsp;Yan Jin ,&nbsp;Tingting Miu ,&nbsp;Shiming Wei ,&nbsp;Yang Xia ,&nbsp;Jizhou Tang","doi":"10.1016/j.ijrmms.2025.106357","DOIUrl":"10.1016/j.ijrmms.2025.106357","url":null,"abstract":"<div><div>Depressurization-induced gas hydrate dissociation is widely employed for gas hydrate production but simultaneously introduces substantial geomechanical challenges, including sediment deformation, formation damage, and subsidence. Such issues have significantly limited the duration of field production tests worldwide, typically causing production to cease within around one month. The reliance on time-independent and quasi-static geomechanical assumptions in many existing models may lead to significant underestimation of depressurization-induced irreversible deformation and overlook time-dependent creep effects. This study develops a fully coupled poro-elasto-viscoplastic-dynamic model specifically designed to analyze realistic dynamic geomechanical responses induced by depressurization in gas hydrate-bearing sediments. The novelty of this work lies in incorporating both the inertial effects and a validated time-dependent elasto-viscoplastic constitutive relationship within a unified poromechanical framework, representing one of the first numerical efforts to capture these coupled effects and their impact on progressive irreversible deformation. The numerical framework integrates thermal, hydraulic, mechanical, and chemical processes. Comprehensive validations against established benchmarks and experimental data substantiate the accuracy and reliability of the model. Results demonstrate distinctive dynamic behaviors, capturing stress rebound phenomena at hydrate dissociation fronts, characterized by sudden stiffness reductions followed by transient stress recovery. The model identifies significant tertiary creep deformation occurring rapidly consistent with global field observations where production frequently terminates due to severe geomechanical deterioration. Comparative analyses further indicate that conventional quasi-static and time-independent constitutive models underestimate cumulative irreversible plastic deformation, potentially misrepresenting short-term geomechanical risks. Unique stress path evolution patterns captured by the dynamic model also provide quantification of transient yielding, stress redistribution, and progressive deformation mechanisms. This study explains the geomechanical reasons underlying the un-sustained and limited-duration gas hydrate production commonly observed in field operations. It also quantifies risks often overlooked or underestimated by simplified modeling approaches.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"197 ","pages":"Article 106357"},"PeriodicalIF":7.5,"publicationDate":"2025-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145593044","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}

{"title":"Characteristics of fault slip, energy budget, and precursory stress drop revealed by fluid-induced fault instability experiments with varied injection rates","authors":"Lishan Zhang ,&nbsp;Chongyuan Zhang ,&nbsp;Yifan Wu ,&nbsp;Manchao He ,&nbsp;Mohua Bu","doi":"10.1016/j.ijrmms.2025.106344","DOIUrl":"10.1016/j.ijrmms.2025.106344","url":null,"abstract":"<div><div>Understanding the mechanisms underlying fluid-induced fault instability is essential for mitigating the risk of triggered seismicity. This study integrates laboratory experiments on granite samples containing a pre-cut fault zone and field data from the Gonghe Enhanced Geothermal System (EGS) to examine how injection rate and confining pressure govern fault slip modes, energy partitioning, and precursor signals. Experimental results demonstrate that injection rate critically modulates slip behavior: low injection rates promote cascades of small, low-energy slip events, whereas high rates induce a three-stage evolution (initiation-creep-instability) that culminates in larger seismic energy release. For stably slipping faults, total hydraulic energy shows a linear correlation with shear displacement. An interesting finding is the identification of a precursory stress drop, marked by a nonlinear transition in the pore pressure growth curve. A precursory time window exists between macro-slip initiation and catastrophic stick-slip. This precursor window shortens with increasing injection rate, underscoring that injection rate control is a primary strategy for seismic hazard management. Field observations from the Gonghe EGS confirm that higher injection rates are associated with reduced hydraulic diffusivity and increased seismic energy release, consistent with the mechanism identified in the laboratory.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"197 ","pages":"Article 106344"},"PeriodicalIF":7.5,"publicationDate":"2025-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145593046","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}

{"title":"Effect of excavation damaged zone on the long-term coupled thermo-hydro-mechanical behaviors of deep geological repositories in granitic rock masses","authors":"Kwang-Il Kim ,&nbsp;Changsoo Lee ,&nbsp;Dongkeun Cho ,&nbsp;Jin-Seop Kim ,&nbsp;Jonny Rutqvist","doi":"10.1016/j.ijrmms.2025.106353","DOIUrl":"10.1016/j.ijrmms.2025.106353","url":null,"abstract":"<div><div>This study numerically investigates the influence of the excavation damaged zone (EDZ) on the long-term coupled thermo-hydro-mechanical (THM) behaviors of the Korean deep geological repository (DGR) concepts in granitic rock masses. Using the extent and properties of the EDZ derived from Korean Atomic Energy Research Institute (KAERI) Underground Research Tunnel (KURT), numerical results reveal that the EDZ exerts a minor influence on thermal behavior but accelerates the resaturation of the buffer and backfill due to its increased permeability. Notably, the EDZ leads to a smaller extent of potential rock failure compared to simulation cases without the EDZ. This is attributed to a more pronounced reduction in thermal stresses relative to the decrease in rock mass strengths. A sensitivity analysis reveals that uncertainties in the rock mass stiffness within the EDZ have a more pronounced effect on the predicted rock failure volume than variations in thermal conductivity and permeability have on the temperature and saturation evolutions. Reducing disposal spacing to increase disposal density defined as the amount of disposed uranium per unit area significantly raises thermal loading and the risk of rock mass failure, potentially inducing continuous failure zones connecting neighboring deposition holes and disposal tunnels under relatively weak rock conditions. These findings suggest that while the EDZ may not be a critical factor in determining disposal spacing, DGR designs to enhance the disposal density necessitate careful consideration of the rock mass strength to ensure long-term safety.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"197 ","pages":"Article 106353"},"PeriodicalIF":7.5,"publicationDate":"2025-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145567443","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}

{"title":"Multiscale analysis of mechanical properties of sandstone: Integrating advanced microscopic characterizations and shape-factor-modified upscaling approach","authors":"Tian-Ya Zhai ,&nbsp;Xiao-Ping Zhou","doi":"10.1016/j.ijrmms.2025.106354","DOIUrl":"10.1016/j.ijrmms.2025.106354","url":null,"abstract":"<div><div>The macroscopic mechanical properties of rocks are affected by the mineral composition. Different minerals exhibit varied mechanical responses due to differences in their crystal structures. In this study, we study microstructures and micromechanical parameters of sandstone, such as Young's modulus, hardness, plasticity work ratio, and elasticity index of rock-forming minerals by the TESCAN Integrated Mineral Analyzer (TIMA) and nanoindentation tests under different indentation loads. Atomic force microscopy (AFM) tests are used to analyze the indentation patterns of minerals under different indentation loads, and the results are employed to calculate fracture toughness. Finally, based on electron backscattering diffraction (EBSD) test, the influence mechanisms of grain boundaries and dislocations in quartz crystals on crack propogation and mechanical properties are investigated. The results show that the Young's modulus, hardness and fracture toughness of quartz, feldspar, osumilite and chlorite are dependent on the indentation load. The indentation deformation of quartz and feldspar is predominantly elastic, while the indentation deformation of osumilite and chlorite is predominantly plastic. Dislocation sources resulting from indentation in quartz crystals produce dislocations near grain boundaries, and these dislocations are impeded by the grain boundaries and accumulate, leading to stress concentrations. This stress concentration may exceed the local strength of the material, promote crack initiation and propagation, and produce new cracks along the grain boundaries, thereby reducing the fracture toughness. The generalized mean method incorporating mineral shape influence factors (SFGMM) establishes a more accurate upscaling approach, providing a high-precision tool for evaluating macroscopic properties of complex geological materials, demonstrating particularly significant value in engineering applications of heterogeneous rocks.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"197 ","pages":"Article 106354"},"PeriodicalIF":7.5,"publicationDate":"2025-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145571568","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}

{"title":"Dynamic response of sandstone under hydro-mechanical coupling: macroscopic behavior and microscopic mechanism","authors":"Ju Wang ,&nbsp;Feng Dai ,&nbsp;Zelin Yan ,&nbsp;Yuanyang Pang ,&nbsp;Mingdong Wei","doi":"10.1016/j.ijrmms.2025.106342","DOIUrl":"10.1016/j.ijrmms.2025.106342","url":null,"abstract":"<div><div>Deep engineering rock masses are typically subjected to coupled in-situ stress, pore water pressure, and construction-induced dynamic disturbances, making it essential to understand the corresponding mechanical behavior and response mechanisms for effective dynamic disaster prevention and control in complex geological environments. In this study, a modified hydro-mechanical coupled split Hopkinson pressure bar (SHPB) system was developed, and the reliability was experimentally validated. The dynamic mechanical response and energy dissipation characteristics of sandstone under hydro-mechanical coupling were investigated utilizing the testing system, and the micromechanical mechanisms were revealed. The results show that the dynamic strength and elastic modulus positively correlate with confining pressure but negatively with pore water pressure. The rate dependency of strength diminishes with increasing confining pressure, yet remains independent of pore water pressure. The peak strain increases nonlinearly with strain rate and pore water pressure. With increasing strain rate and pore water pressure, the reflected energy proportion increases, while transmitted energy and energy utilization rate decrease. The dissipated energy density increases linearly with the logarithm of incident energy and shows a rate dependency. A pore-emanated crack model considering the coupling of pore water pressure and triaxial dynamic compression was established. The model indicates that confining pressure reduces the stress intensity factor (SIF) at crack tips, causing the critical stress for microcrack propagation to follow a power-law increase. The pore water pressure increases the SIF, resulting in a linear decrease in the critical stress. As pore radius and strain rate increase, the initiation time of microcracks advances. Finally, the competitive relationship between the water wedge effect and Stefan effect under different coupling conditions is revealed. The research conclusions can provide scientific reference for rock engineering construction and stability evaluation under the coupled environment of dynamic stress and pore water pressure.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"197 ","pages":"Article 106342"},"PeriodicalIF":7.5,"publicationDate":"2025-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145560019","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}