Geofluids最新文献

{"title":"Dynamic Numerical Analysis of Seismic Liquefaction and Deformation Failure in Silty Fine Sand of the Main Canal of Xixiayuan Irrigation District","authors":"Fengmin Lu,&nbsp;Liang Zhao,&nbsp;Yingchen Li,&nbsp;Yawen Zhao,&nbsp;Ke Zhang,&nbsp;Jinyu Dong","doi":"10.1155/gfl/3615959","DOIUrl":"https://doi.org/10.1155/gfl/3615959","url":null,"abstract":"<p>Sand liquefaction has long been one of the key topics in the fields of soil dynamics and geotechnical earthquake engineering. Based on the Zhulong river section project of the main canal in Xixiayuan irrigation district, dynamic parameters of soil and rock masses were obtained through field and laboratory tests. Using geotechnical numerical analysis with FLAC 3D software, the constitutive model of sand was selected as the Finn model, and appropriate horizontal natural seismic waves corresponding to engineering site conditions and seismic fortification intensity were input to conduct dynamic numerical analysis on earthquake liquefaction of silty fine sand in canal foundation and characteristics of canal deformation and failure. The results indicate that under seismic action, the maximum excess pore water pressure occurs in the silty fine sand layer at the bottom of the canal embankment. However, due to the high initial stress in this layer, the pore pressure ratio remains low, preventing liquefaction. In contrast, in the channel bottom and the localised areas from the outer slope platform to the toe of the canal embankment, although the excess pore water pressure is relatively low, the effective stress is small, resulting in a higher pore pressure ratio, leading to liquefaction of the silty fine sand layers. Seismic-induced deformation primarily occurs in the embankment and shallow foundation soils and exhibits a symmetric pattern. The deformation and failure of the embankment slope are mainly characterised by seismic subsidence and tensile failure at the crest, as well as horizontal lateral flow deformation at the slope toe. During the calculation process, monitoring points were installed at various locations in the canal embankment and foundation, capturing the dynamic changes in excess pore water pressure, effective stress and displacement at different positions under seismic loading. Based on the analysis of shear strain increment, a continuous shear sliding surface was found to develop within the embankment and foundation under seismic forces, suggesting a risk of overall sliding failure. The research findings are significant for understanding and addressing sand liquefaction characteristics in the Xixiayuan irrigation district’s main canal project.</p>","PeriodicalId":12512,"journal":{"name":"Geofluids","volume":"2026 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/gfl/3615959","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147615079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Coal and Gas Outburst Behavior in Gas-Bearing Tunnels Revealed Through an Interpretable ISSA-DNN Learning Framework","authors":"Fangyin Wu,&nbsp;Wenbo Yang,&nbsp;Zhiyu Chen,&nbsp;Jian Yan,&nbsp;Wenyu Xu,&nbsp;Lina Wen","doi":"10.1155/gfl/8699333","DOIUrl":"https://doi.org/10.1155/gfl/8699333","url":null,"abstract":"<p>Coal and gas outbursts represent one of the most severe safety hazards during the construction of gas-bearing tunnels. Accurate risk prediction remains difficult because of complex geological conditions, limited sample sizes, and the inherent subjectivity in hazard classification. In this study, an interpretable data-driven prediction framework is developed by coupling an Improved Sparrow Search Algorithm (ISSA) with a Deep Neural Network (DNN). A dataset comprising 198 samples collected from multiple gas-bearing tunnel projects is established and carefully preprocessed, including missing-value imputation, outlier treatment, and class balancing. To reduce subjectivity in historical labels, Principal Component Analysis combined with K-Means++ clustering is employed to reassign outburst risk levels. The ISSA introduces multiple enhancement strategies to improve global search capability and convergence stability and is used to optimize key hyperparameters of the DNN. Model interpretability is further enhanced using SHapley Additive exPlanations (SHAP), which quantify feature contributions at both global and individual-sample levels. The proposed ISSA-DNN model achieves an accuracy of 0.91 and an F₁-score of 0.92, outperforming several commonly used machine learning methods. SHAP analysis indicates that the coal firmness coefficient, initial gas desorption rate, and burial depth play dominant roles in outburst risk prediction. The proposed framework provides a practical and transparent tool for early hazard identification in gas-bearing tunnel engineering.</p>","PeriodicalId":12512,"journal":{"name":"Geofluids","volume":"2026 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/gfl/8699333","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147568052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on Perforation Performance and Reservoir Stimulation Effect of a New Self-Cleaning and Aftereffect Perforation Technology","authors":"Gang Bi,&nbsp;Xiaoqian Jia,&nbsp;Junhan Liu,&nbsp;Yu Li,&nbsp;Pan Wang,&nbsp;Chenbo Gu","doi":"10.1155/gfl/4159311","DOIUrl":"https://doi.org/10.1155/gfl/4159311","url":null,"abstract":"<p>The development of low-permeability reservoirs in the South China Sea X Oilfield is frequently hindered by severe compaction damage zones induced by conventional shaped charge perforation, which significantly impair well productivity. To mitigate these adverse effects, novel self-cleaning and aftereffect perforation technologies have been proposed; however, their quantitative efficacy under coupled downhole conditions remains insufficiently validated. This study presents a systematic comparative evaluation of these technologies against conventional perforation, utilizing both surface single-target red sandstone experiments and full-scale annular concrete target simulations under high-temperature (147°C) and high-pressure (35 MPa) conditions. The results demonstrate a distinct trade-off between penetration depth and tunnel geometry. While self-cleaning and aftereffect charges resulted in penetration depths 22.9%–25.5% and 1.27%–14.74% shallower than conventional charges, they achieved significantly larger tunnel diameters, increasing by 27.8%–44.4% and 11.6%–21.8%, respectively. This morphological shift led to a net increase in effective perforation cavity volume of 9.7%–12.5%. Crucially, gas permeability tests revealed that self-cleaning and aftereffect technologies retained 65.8% and 38.6% of the original formation permeability, respectively—drastically outperforming the 17.4% retention of conventional perforation. These enhancements are attributed to the secondary high-pressure gas scouring mechanism in self-cleaning charges and the localized shock wave expansion in aftereffect charges. Consequently, this study recommends self-cleaning perforation for deep (&gt;3000 m) tight sandstone reservoirs and aftereffect perforation for shallower (1000–3000 m) loose formations, providing a physics-based strategy for optimizing offshore field development.</p>","PeriodicalId":12512,"journal":{"name":"Geofluids","volume":"2026 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/gfl/4159311","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147567648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gas Diffusion Coefficient in Tight Sandstones: An Experimental Approach Under Various Controlling Factors","authors":"Zhongying Zhao,&nbsp;Shan Lu,&nbsp;Lijun Zhang,&nbsp;Shouxu Pan","doi":"10.1155/gfl/3513630","DOIUrl":"https://doi.org/10.1155/gfl/3513630","url":null,"abstract":"<p>This study investigates the natural gas diffusion coefficients in tight sandstones, emphasizing the Sulige area′s geological conditions. Through experimental measurements and the simulation of natural gas diffusion processes, we explore the impact of various geological factors—including temperature, pressure, porosity, permeability, pore throat radius, and clay content—on gas diffusion coefficients. Our findings reveal that temperature and porosity positively influence diffusion, aligning with molecular collision theory, and displaying a linear relationship with the diffusion coefficient, respectively. Conversely, pressure and clay content negatively affect diffusion, with coefficients showing exponential decreases under higher pressures and increased clay content. Permeability and pore throat radius enhance diffusion in a logarithmic manner. Building on these individual relationships, we developed a multifactor model to accurately predict the gas diffusion coefficients in tight sandstones under diverse geological settings. Validation with the actual sample measurements confirms the precision of our model and its applicability across different geological periods and conditions. Our research offers valuable insights into understanding natural gas diffusion in tight sandstones, providing a solid foundation for further exploration and exploitation strategies in similar geological settings.</p>","PeriodicalId":12512,"journal":{"name":"Geofluids","volume":"2026 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/gfl/3513630","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147567721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multiscale Digital Core Technology for Analyzing the Genesis of Low-Resistivity Oil Reservoirs in the Guantao Formation of Bohai Sea: Clay Mineral-Induced Additional Conductivity Effect, Pore Structure Regulation Mechanism, and Quantitative Characterization","authors":"Hao Zhang,&nbsp;Zhansong Zhang,&nbsp;Xin Nie,&nbsp;Wenjun Yan,&nbsp;Hengyang Lv","doi":"10.1155/gfl/9975345","DOIUrl":"https://doi.org/10.1155/gfl/9975345","url":null,"abstract":"<p>The genetic mechanism of low-resistivity oil reservoirs in the Guantao Formation of the Bohai Sea is complex, and understanding the role of clay minerals and pore structures in forming low resistivity remains unclear. This study employed multiscale digital core technology to integrate multisource digital core data. Combined with flow characteristic-based upscaling technology, microscale and nanoscale digital cores were reconstructed to calculate parameters such as porosity, permeability, and formation factor. At the same time, mercury intrusion and seepage experiments were simulated. The research reveals two key mechanisms underlying the influence of clay minerals and pore structures on low-resistivity oil reservoirs: first, the additional conductive effect of clay. Among clay minerals, illite–smectite mixed-layer minerals exhibit the strongest conductivity, which is the key factor contributing to reduced resistivity, followed by illite, kaolinite, and chlorite in decreasing order of additional conductive capacity. The second is the regulatory role of pore structures. Kaolinite fills intergranular pores to form a complex micropore system, resulting in high irreducible water saturation in the reservoir, which is the primary cause of low-resistivity oil reservoirs. This study clarifies the influence mechanisms of clay minerals and pore structures on resistivity, provides key technical support for fine geological modeling and optimization of oil and gas reservoir development schemes, and holds significant practical value for reducing exploration risks and improving oil recovery efficiency.</p>","PeriodicalId":12512,"journal":{"name":"Geofluids","volume":"2026 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/gfl/9975345","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147567205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Controls of Base-Level Cycles on the Sedimentary Architecture of Subaqueous Distributary Channels in a Lacustrine Delta: A Case Study From the Chang 8 Member, Ordos Basin","authors":"Xin Wang,&nbsp;Meng Wang,&nbsp;Jianhui Wan,&nbsp;Ziqiang Wu,&nbsp;Di Wang,&nbsp;Qian Xiao,&nbsp;Luxing Dou,&nbsp;Canying Luo","doi":"10.1155/gfl/4703485","DOIUrl":"https://doi.org/10.1155/gfl/4703485","url":null,"abstract":"<p>Base-level cycles serve as a crucial reference for the stratigraphic sedimentology. In lacustrine basins, high-frequency base-level changes contribute to significant diversity and complexity in sequences and sedimentary infilling. The sequences′ infill and facies distribution in lacustrine basins differ greatly from marine deposits. The subaqueous distributary channels are well-developed lacustrine deltas and serve as important hydrocarbon reservoirs. However, how high-frequency base-level cycles control the sedimentary architecture evolution of subaqueous distributary channels in lacustrine basins still requires further investigation. This study investigates the sedimentary architecture of subaqueous distributary channel deposits in the Triassic Yanchang Formation, Baibao area, Ordos Basin. The primary objective is to analyze the constraining effects of base-level cycles on these sedimentary bodies, which formed under the predominant influence of inertial forces within a lacustrine deltaic system. Based on INPEFA technology, one long-term, two medium-term, and eight short-term base-level cycles (SSC1–SSC8) were identified within the Chang 8 Member of the Yanchang Formation in the Baibao area. Core and logging analyses reveal that the sedimentary system within the Chang 8 Member is primarily a shallow-water delta front facies, with four identifiable facies. Subaqueous distributary channels and mouth bars are sandstone-dominated depositional elements. Within this framework, the MSC2 medium-term cycle represents a period of lacustrine expansion, dominated by delta front and plain deposits. Conversely, the MSC1 cycle signifies a contraction phase, during which subaqueous distributary channel sandbodies became predominant within the delta front. The evolution of the distributary channels was controlled by short-term base-level cycles. The SSC7–SSC8 descending cycle, the channels evolved into isolated, narrow distributary channels. In contrast, the SSC4–SSC6 ascending cycle resulted in less-connected isolated channels with reduced sandstone accumulation. Finally, during the SSC2–SSC3 descending cycle developed well-connected channels that form the main sandstone deposits. This evolution demonstrates a clear link between cycle type and reservoir architecture. The observed sedimentary cycles exhibit significant and systematic variations in sandstone body architecture in different base-level cycles. This study proposed a concept model for allocyclic base-level controls on the deltaic sandstone. This model provides insights for predicting shallow-water delta reservoirs in lacustrine basins with high-frequency base-level changes.</p>","PeriodicalId":12512,"journal":{"name":"Geofluids","volume":"2026 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/gfl/4703485","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147566450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the Formation Mechanism of Seepage Network in Fractured Rock Mass Under the Coupling of Hydromechanical Process","authors":"Yang Liu,&nbsp;Yingchao Wang,&nbsp;Wanghua Sui","doi":"10.1155/gfl/6251767","DOIUrl":"https://doi.org/10.1155/gfl/6251767","url":null,"abstract":"<p>Water inrush disasters caused by fractures are frequent in geotechnical engineering today, gradually becoming a bottleneck to underground engineering development. Various natural processes result in many fractures of different sizes in the rock mass. The inherent concealment and complexity of geological strata preclude direct observations, leading to a limited understanding of the permeability characteristics of fractured rock formations. Therefore, a hydroelectric power plant is selected as the case study. PFC2D and data regression analysis methods are used to carry out numerical calculations of fracture seepage and establish an assessment model. The research results reveal the formation mechanism and distribution of the seepage network of fractured rock under the hydromechanical coupling and establish the statistical regression analysis model of fractured rock porosity. The main conclusions are as follows: (1) The different morphology of fractures leads to the division of fractures into water-blocking fractures and seepage channels. However, the seepage channel is discontinuous due to the mutual cutting of water-blocking fractures and seepage channels. (2) Under the coupling of the hydromechanical process, the hydraulic conductivity of the fracture decreases exponentially with the increase of the fracture angle and maximum principal stress and decreases linearly with fracture residual length. (3) The fracture dip angle, lateral pressure coefficient, fracture residual length, and time are selected as the influencing factors to establish the statistical regression analysis model, which provides an effective analysis method for accurate evaluation of engineering stability.</p>","PeriodicalId":12512,"journal":{"name":"Geofluids","volume":"2026 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/gfl/6251767","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147565581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deterioration Mechanism of Fractured Coal–Rock Combined Body Under Coupled Chemical Corrosion and Time Effects","authors":"Liya Yu,&nbsp;Guangbo Chen,&nbsp;Guanxian Kang","doi":"10.1155/gfl/9946427","DOIUrl":"https://doi.org/10.1155/gfl/9946427","url":null,"abstract":"<p>Addressing the stability issues of coal mine underground reservoir dams caused by long-term erosion from highly acidic/alkaline mine water, this study investigates the mechanical property deterioration of fractured coal–rock combined bodies under the action of solutions with different pH values (3, 5, 7, and 9) and immersion times (7–35 days) through laboratory tests. The results indicate that the solution pH shifted sharply towards neutral or weakly alkaline during the initial immersion stage (within 7 days), exhibiting a strong self-balancing effect. The compressive strength, elastic modulus, and prepeak/postpeak strain energy of the specimens significantly deteriorated with increasing acidity and prolonged immersion time, with the most pronounced effects observed in the strongly acidic (pH = 3) environment. Acoustic emission monitoring showed that the cumulative ring count increased with damage development, further confirming the severe damaging effect of the strong acidic environment on the internal structure of the specimens. Additionally, although the hydrochemical environment influenced the crack development degree in the coal part, all specimens ultimately exhibited a tensile-shear mixed failure mode dominated by shear. This research reveals the internal mechanism whereby the hydrochemical environment, through the combined effects of chemical corrosion and time, leads to the mechanical property deterioration of coal–rock combined bodies, providing a theoretical basis for the long-term stability assessment and design of coal mine underground reservoir dams.</p>","PeriodicalId":12512,"journal":{"name":"Geofluids","volume":"2026 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/gfl/9946427","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147565322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nonlinear Seepage Characteristics and Microscopic Oil Displacement Visualization Experiment of Highly Viscoelastic Polymer","authors":"Lina Shi,&nbsp;Jian Hou,&nbsp;Ruixin Liu,&nbsp;Jiahe Sun,&nbsp;Xuwen Qin,&nbsp;Yongge Liu,&nbsp;Qingjun Du","doi":"10.1155/gfl/6762826","DOIUrl":"https://doi.org/10.1155/gfl/6762826","url":null,"abstract":"<p>Understanding the nonlinear seepage behavior and microscopic displacement mechanisms of highly viscoelastic polymers is essential for optimizing polymer flooding in heterogeneous reservoirs. This study is aimed at clarifying how polymer viscosity, elasticity, and pore-scale deformation jointly influence flow resistance and oil displacement performance. Two polymer systems—a conventional HPAM and a highly viscoelastic polymer—were selected as research objects. A series of rheological measurements, nonlinear seepage experiments using sand-pack models, and microscopic visualization tests were conducted to quantify the effects of polymer concentration, elastic modulus, permeability, and back pressure on injection resistance and sweep behavior. The results demonstrate that, at the same concentration, the highly viscoelastic polymer exhibits substantially higher viscosity and elastic modulus than conventional HPAM, with elasticity increasing sharply above 0.20 wt%. Under matched apparent viscosity, the highly viscoelastic polymer shows consistently higher flow resistance due to elastic energy storage and release during repeated contraction–expansion through pore throats. Apparent viscosity increases with permeability and exhibits opposite trends with back pressure at low and high shear conditions. Microscopic visualization reveals that higher polymer concentration and stronger elasticity improve sweep efficiency, suppress viscous fingering, and reduce residual oil. At 2.0 PV injection, the sweep efficiency of the 0.25 wt% highly viscoelastic polymer reaches 85%, significantly exceeding that of conventional polymer. This work provides new quantitative evidence linking polymer elasticity to both nonlinear seepage characteristics and pore-scale displacement behavior. The findings enhance the understanding of viscoelastic polymer flooding mechanisms and offer guidance for designing polymer systems with improved sweep and displacement efficiency in heterogeneous reservoirs.</p>","PeriodicalId":12512,"journal":{"name":"Geofluids","volume":"2026 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/gfl/6762826","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147565330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the Shear Performance of Plastic Rubber–Concrete Impermeable Walls for Rock-Bound Embankments","authors":"Yueqiang Qi,&nbsp;Jin Wang,&nbsp;Yanan Zhang,&nbsp;Wence Sun,&nbsp;Hongrui Wu,&nbsp;Yongzhuang Zhang","doi":"10.1155/gfl/2156288","DOIUrl":"https://doi.org/10.1155/gfl/2156288","url":null,"abstract":"<p>Shear damage at the base of seepage control walls in rock-bound embankments presents a critical challenge in flood defense engineering. This study examines the shear behavior of plastic rubber concrete by varying rubber powder dosage (0–30 kg/m³), water–binder ratio (0.6–0.8), and rubber particle size (40–80 mesh). Direct shear tests on <i>Φ</i>150 × 150 mm specimens show that increasing the rubber dosage from 0 to 30 kg/m³ nearly doubles the friction coefficient (0.4824 → 0.9634) while reducing cohesion (1.1829 MPa →0.7509 MPa). Lowering the water–binder ratio effectively offsets this cohesion loss; at W/B = 0.6, cohesion increases by up to 37.8%, and the friction coefficient reaches 1.8366. Particle-size analysis indicates that 60-mesh rubber provides the best balance, raising cohesion to 1.85 MPa and more than doubling friction relative to the control. Mechanism tests (ring-shrinkage and SEM) reveal that rubber introduces compliant interfacial zones that redistribute stress, delay cracking, and enhance post-peak shear resistance. The optimized mix (30 kg/m³, 60 mesh, W/B = 0.6) was successfully applied in a Yellow River cutoff wall and met all design requirements, with 2 years of monitoring confirming stable mechanical and hydraulic performance. This study provides practical insights and empirical evidence for the application of rubberized plastic concrete in seepage control structures, promoting sustainable use of waste rubber in civil infrastructure.</p>","PeriodicalId":12512,"journal":{"name":"Geofluids","volume":"2026 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/gfl/2156288","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147565264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}