Engineering Geology最新文献_第9页

An innovative and efficient approach for slope reliability analysis: Machine learning based surrogate modeling with advanced attention mechanisms 一种创新和有效的边坡可靠性分析方法：基于机器学习的代理模型与先进的注意机制

IF 6.9 1区工程技术

Engineering Geology Pub Date : 2025-06-15 DOI: 10.1016/j.enggeo.2025.108194

Nenghao Huang , Yu Han , Weiwei Xie , Rui Hu , Hao Peng , Guanxian Song , Menglan Wu , Menglong Zhu , Hua Wei , Ming Liang

{"title":"An innovative and efficient approach for slope reliability analysis: Machine learning based surrogate modeling with advanced attention mechanisms","authors":"Nenghao Huang , Yu Han , Weiwei Xie , Rui Hu , Hao Peng , Guanxian Song , Menglan Wu , Menglong Zhu , Hua Wei , Ming Liang","doi":"10.1016/j.enggeo.2025.108194","DOIUrl":"10.1016/j.enggeo.2025.108194","url":null,"abstract":"<div><div>Slope stability analysis in spatially variable soils poses significant computational challenges for traditional methods. While surrogate models offer potential solutions, they face limitations in handling high-dimensional data of random fields and lack interpretability. This study introduces a novel LeNet5-CBAM surrogate model that combines Convolutional Neural Networks (LeNet5 base) with Convolutional Block Attention Module (CBAM) to analyze slope stability. The model innovatively processes both grayscale images of random fields and numerical features of mean shear strength values, achieving a Root Mean Square Error (RMSE) of 0.030 in factor of safety (FoS) prediction and a high F1-score, demonstrating strong capability in identifying unstable slopes. With only 400 training samples, it yields an accurate estimation of the probability of failure (<em>P</em><sub><em>f</em></sub>), with a relative error of 0.022. Through Gradient-weighted Class Activation Mapping (Grad-CAM) visualization, the model demonstrates high interpretability by identifying critical zones that influence slope stability. Case studies show that this approach reduces computational time while maintaining high accuracy, offering a practical tool for rapid slope stability assessment in engineering practice.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"354 ","pages":"Article 108194"},"PeriodicalIF":6.9,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144321549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing containment performance of geosynthetic clay liner to bauxite liquor via composite polymer amendment 通过复合聚合物改性提高土工合成粘土衬里对铝土矿液的密封性能

IF 6.9 1区工程技术

Engineering Geology Pub Date : 2025-06-15 DOI: 10.1016/j.enggeo.2025.108189

Xian-Lei Fu, Zhe-Yuan Jiang, Min Wang, Hao Ni, Yan-Jun Du

{"title":"Enhancing containment performance of geosynthetic clay liner to bauxite liquor via composite polymer amendment","authors":"Xian-Lei Fu, Zhe-Yuan Jiang, Min Wang, Hao Ni, Yan-Jun Du","doi":"10.1016/j.enggeo.2025.108189","DOIUrl":"10.1016/j.enggeo.2025.108189","url":null,"abstract":"<div><div>Polymer amended geosynthetic clay liners (GCLs) have exhibited substantial semipermeable membrane behavior in singe-species salt solution. However, very few studies have evaluated the membrane and diffusion behavior of polymer amended GCLs in multi-species leachates. This study investigated the membrane and diffusion behavior of novel composite polymer amended GCL (referred to as PHGCL) using diluted and fresh bauxite liquors as the testing liquids. The membrane efficiency coefficient (<em>ω</em>), effective diffusion coefficient (<em>D</em>*), retardation factor (<em>R</em><sub>d</sub>) of PHGCL were evaluated. Conventional (unamended) GCL was tested as control. The results revealed that PHGCL exhibited significantly higher <em>ω</em> ranging from 0.435 to 0.005, which was approximately 1.7–2.5 times of that for the unamended GCLs. The composite polymer amendment reduced the <em>D</em>* of K<sup>+</sup>, Ca<sup>2+</sup>, Na<sup>+</sup>, Al<sup>3+</sup>, and Pb<sup>2+</sup> migrating through the GCLs, and the reductions were relatively limited (≤ 14.2 %). Conversely, the <em>R</em><sub>d</sub> of PHGCL was markedly elevated with the maximum increase reaching 91.6 % as compared to the unamended GCL. Comparative analysis indicated that when exposed to single-species salt solutions, multivalent cations migrating through the GCLs generally possessed higher <em>D</em>* than monovalent cations. However, in multi-species solutions, monovalent cations showed higher <em>D</em>*, as their diffusion is primarily governed by their free-solution diffusion coefficients.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"354 ","pages":"Article 108189"},"PeriodicalIF":6.9,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144304942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hydro-mechanical behavior of compacted GMZ bentonite blocks with a vertical technological void 具有垂直工艺空隙的压实GMZ膨润土块体的水力学行为

IF 6.9 1区工程技术

Engineering Geology Pub Date : 2025-06-15 DOI: 10.1016/j.enggeo.2025.108191

Jing Ma , Yong-gui Chen , Yu-jun Cui , Wei-min Ye , Qiong Wang

{"title":"Hydro-mechanical behavior of compacted GMZ bentonite blocks with a vertical technological void","authors":"Jing Ma , Yong-gui Chen , Yu-jun Cui , Wei-min Ye , Qiong Wang","doi":"10.1016/j.enggeo.2025.108191","DOIUrl":"10.1016/j.enggeo.2025.108191","url":null,"abstract":"<div><div>In the deep geological repository for high-level radioactive waste (HLW), technological voids are inevitably generated during the construction, which may influence the bentonite-based barrier performance. To well understand the self-sealing/healing mechanisms, simultaneous morphology-hydromechanical tests were performed on compacted GMZ bentonite blocks with vertical technological void, and the overall dry densities of samples were controlled to be the same. Results showed that the self-sealing/healing process had three stages: free swelling and cracking due to hydration in the first stage, confined swelling and cracking due to water migration in the second stage, and steady evolution of healing process in the third stage. More fragmented secondary cracks were observed with the decrease of technological void. The drop of swelling pressure in the second stage gradually disappeared with the reduction of the technological void or the rise of initial water injection pressure. The evolution of hydraulic conductivity with healing process was fitted by an exponential function, and its horizontal asymptote was defined as the final hydraulic conductivity, which was found to increase with the decline of the technological void or the increase of initial water injection pressure. It was inferred that the lower initial technological void led to a rapid sealing of the technological void and the higher water injection pressure was equivalent to a confining pressure due to the low permeability of the compacted bentonite. Both of them hampered the free swelling of the aggregates, resulting in the poor development of a honeycomb structure in the sealed joint.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"354 ","pages":"Article 108191"},"PeriodicalIF":6.9,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Detection of overburden stress based on dynamic pressure differential index of hydraulic support 基于液压支架动压差指标的覆岩应力检测

IF 6.9 1区工程技术

Engineering Geology Pub Date : 2025-06-14 DOI: 10.1016/j.enggeo.2025.108188

Like Wei , Deyi Jiang , Yulong Chen

{"title":"Detection of overburden stress based on dynamic pressure differential index of hydraulic support","authors":"Like Wei , Deyi Jiang , Yulong Chen","doi":"10.1016/j.enggeo.2025.108188","DOIUrl":"10.1016/j.enggeo.2025.108188","url":null,"abstract":"<div><div>Problems such as roof collapse and support crushing are frequently encountered in the working face and threatened safety of the working face. Therefore, understanding the overburden stress is crucial to hazard detection and mitigation in deep coal mining. The hydraulic support is in direct contact with the roof of the working face in the working space of the shearers, which can most comprehensively characterize the overburden stress in the coal seam roof. To fully detect the overburden stress in the entire range of the working face, online monitoring of the support resistance of hydraulic support is a valid alternative for working face management to enable the detection of overburden stress. This paper establishes a detection method of overburden stress by support resistance in terms of dynamic pressure differential index of support (DPDIS). The theoretical solution of DPDIS is derived. Furthermore, the spatial evolution of the DPDIS in coals in the working face is simulated. Finally, this DPDIS method is applied in an intelligent working face of a coal mine characterized by high gas content. The influence of stiffness, initial support and lagged distance of supports on the DPDIS is evaluated. The DPDIS could be effectively used to detect the concentrated stress in the coal in front of the working face is verified.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"354 ","pages":"Article 108188"},"PeriodicalIF":6.9,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144304884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Field research on preferential infiltration in rainfall-induced loess landslides 降雨诱发黄土滑坡优先入渗的实地研究

IF 6.9 1区工程技术

Engineering Geology Pub Date : 2025-06-10 DOI: 10.1016/j.enggeo.2025.108184

Jianhua Ma , Runqiang Zeng , Xingmin Meng , Zonglin Zhang , Shufen Zhao , Ziran Wei

{"title":"Field research on preferential infiltration in rainfall-induced loess landslides","authors":"Jianhua Ma , Runqiang Zeng , Xingmin Meng , Zonglin Zhang , Shufen Zhao , Ziran Wei","doi":"10.1016/j.enggeo.2025.108184","DOIUrl":"10.1016/j.enggeo.2025.108184","url":null,"abstract":"<div><div>Rainfall-induced loess landslides are widespread across the Loess Plateau, especially in the middle and south region. The rainfall infiltration characteristics of slopes are vital for slope instability mechanisms research and for hazard warning and prevention. To explore the rainwater infiltration and hydrological characteristics of loess and evaluate the preferential contribution of infiltration, with a focus on the Luoyu Valley in Tianshui city as a case study. A slope was selected for conducting artificial rainfall tests, which were monitored via sensors and electrical resistivity tomography (ERT). The sensor and ERT results indicate that preferential infiltration widely occurs in the loess slope, affecting the distribution of rainwater, the shape of the wetting front, and the rate of infiltration. On this basis, the variations in hydraulic factors in the loess slope and water infiltration direction are revealed under the impact of preferential infiltration. Numerical simulations were subsequently conducted to explore infiltration characteristics in uniform zones and preferential channels. In the slope, under pressure infiltration (ponding water) conditions, preferential infiltration occurs within fissures and affects the whole morphology of the wetting front. Our results emphasize the pivotal role of preferential infiltration in loess slope infiltration, which is of great theoretical value in landslide stability calculations.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"354 ","pages":"Article 108184"},"PeriodicalIF":6.9,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144288929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thaw slump development in permafrost regions alters the soil hydrothermal processes and responses to precipitation 冻土区融化坍落度的发展改变了土壤热液过程及其对降水的响应

IF 6.9 1区工程技术

Engineering Geology Pub Date : 2025-06-09 DOI: 10.1016/j.enggeo.2025.108183

Zhongyang Zhang , Yibo Wang , Zhanghuai Ma , Mingxia Lv , Zeyong Gao

{"title":"Thaw slump development in permafrost regions alters the soil hydrothermal processes and responses to precipitation","authors":"Zhongyang Zhang , Yibo Wang , Zhanghuai Ma , Mingxia Lv , Zeyong Gao","doi":"10.1016/j.enggeo.2025.108183","DOIUrl":"10.1016/j.enggeo.2025.108183","url":null,"abstract":"<div><div>In the context of global warming, understanding the impact of thaw slump on soil hydrothermal processes and its responses to climate is essential for protecting engineering facilities in cold regions. This study aimed to investigate the effect of thaw slump development on active layer soil. We considered the early thaw slump development in the Tibetan Plateau as research object and conducted long-term monitoring of soil hydrothermal activity in the active layer of various parts of the landslide and the regional meteorology. The results showed that thaw slump development shortened the freezing and thawing time of the active layer, increased the freezing and thawing rates of the shallow soil (10–20 cm), and enhanced the heat exchange between the active layer soil and the atmosphere and the heat transfer between the soils. The heat-exchange efficiency of the active layer, from largest to smallest, was headwall > collapsed area > unaffected area (bottom of the slope) > unaffected area (top of the slope). Furthermore, thaw slump development lowered the water storage of the active layer prof ile and weakened the dynamic response of soil water to precipitation. The events of soil water responses and soil water increments were smaller in the landslide area than in the unaffected area. During a co-precipitation event, the overall soil water storage increment (SWSI) of the profile was significantly smaller in the landslide area than in the unaffected area (<em>P</em> < 0.05), with an SWSI of 2.04 mm in the headwall and 1.77 mm in the collapsed area. In addition, thaw slump development altered the mechanism of soil water transport driven by soil temperature changes, which affected soil water redistribution of profile. The study gives ecohydrology-related research in cold climates a scientific foundation, thereby guiding the construction and maintenance of infrastructure projects.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"354 ","pages":"Article 108183"},"PeriodicalIF":6.9,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144262294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanism of bed scour erosion in narrow and steep debris-flow channels based on SPH–DEM–FEM coupling 基于SPH-DEM-FEM耦合的窄陡泥石流通道河床冲刷侵蚀机理

IF 6.9 1区工程技术

Engineering Geology Pub Date : 2025-06-09 DOI: 10.1016/j.enggeo.2025.108182

Junmu Wang , Xiekang Wang , Qiang Yao , Guoqing Xu , You Luo , Hongtao Li

{"title":"Mechanism of bed scour erosion in narrow and steep debris-flow channels based on SPH–DEM–FEM coupling","authors":"Junmu Wang , Xiekang Wang , Qiang Yao , Guoqing Xu , You Luo , Hongtao Li","doi":"10.1016/j.enggeo.2025.108182","DOIUrl":"10.1016/j.enggeo.2025.108182","url":null,"abstract":"<div><div>Debris flows are a powerful and devastating form of geological hazards. Notable deep and lateral erosion of the channel bed occurs during debris-flow transport. Narrow and steep debris-flow channels cause more severe bed scour erosion. Moreover, the impact erosion caused by the transition from a rigid to an erodible bed owing to debris flows is highly destructive. Clarifying the mechanism of scour erosion is important for research on the erosion rate and estimation of the sediment volume transported by debris flows. Therefore, in this paper, we conduct a flume test of debris flows propagating over an erodible bed. Moreover, we use numerical simulation to reconstruct the flume test. The simulation is validated based on the parameters obtained from the flume test. Based on the calibrated model, we reveal the erosion process between the debris flows and channel materials. The simulation is based on a coupled approach involving smoothed particle hydrodynamics (SPH), discrete element method (DEM), and finite element method (FEM). Based on both the simulation and test results, an erosion resistance factor (ERF) is proposed to quantify the scour erosion resistance of bed particles. Utilizing the definitions of erosion rate, we explore the relationship between ERF and erosion rate. The results demonstrate that ERF can effectively describe the erosion process. A method of calculating the maximum erosion depth is derived using ERF. The error between calculated results and experimental results of the maximum erosion depth is <5 %.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"354 ","pages":"Article 108182"},"PeriodicalIF":6.9,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144255393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Probabilistic evaluation of vibratory probe compaction effects on liquefiable soil considering spatial variability 考虑空间变异性的可液化土振动探头压实效果概率评价

IF 6.9 1区工程技术

Engineering Geology Pub Date : 2025-06-07 DOI: 10.1016/j.enggeo.2025.108179

Shijie Zhai , Guangyin Du , Tengyuan Zhao , Yong Yang , Xiaohan He , Zifan Wang

{"title":"Probabilistic evaluation of vibratory probe compaction effects on liquefiable soil considering spatial variability","authors":"Shijie Zhai , Guangyin Du , Tengyuan Zhao , Yong Yang , Xiaohan He , Zifan Wang","doi":"10.1016/j.enggeo.2025.108179","DOIUrl":"10.1016/j.enggeo.2025.108179","url":null,"abstract":"<div><div>This study assesses the role of the vibratory probe compaction method (VPCM) in mitigating liquefaction hazards, considering the spatial variability of the cyclic resistance ratio (CRR). A Bayesian framework was employed to identify statistically homogeneous CRR layers and the random field model parameters to accurately determine the impact of VPCM on CRR at different depths. The liquefiable to total soil thickness ratio was probabilistically determined using Monte Carlo simulations to identify liquefiable soil layers and quantify liquefaction severity. Results reveal that VPCM homogenizes CRR statistical properties across soil layers during treatment. Shallow layers showed reduced CRR uncertainty and scale of fluctuation due to loosening, whereas deeper layers exhibited improved liquefaction resistance but increased CRR variability. Probabilistic analysis was conducted to evaluate liquefaction risk in statistically homogeneous soil layers. Deep liquefiable soil layers transitioned from severe liquefaction susceptibility to slight or no liquefaction after treatment. These findings highlight VPCM's dual role: effectively reducing liquefaction severity in deep layers while introducing depth-dependent trade-offs in soil homogeneity and uncertainty. The method offers a viable mitigation strategy when prioritizing deep-layer stability over shallow-layer CRR consistency.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"354 ","pages":"Article 108179"},"PeriodicalIF":6.9,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144239349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation indicators and classification system for rock mass boreability based on rock mass chip image processing 基于岩体切屑图像处理的岩体可钻孔性评价指标及分类体系

IF 6.9 1区工程技术

Engineering Geology Pub Date : 2025-06-06 DOI: 10.1016/j.enggeo.2025.108176

Changbin Yan , Weirong Zhao , Tengfei Wang , Ziang Gao , Xiang Xiao , Jianpeng Qin , Yalong Jiang

{"title":"Evaluation indicators and classification system for rock mass boreability based on rock mass chip image processing","authors":"Changbin Yan , Weirong Zhao , Tengfei Wang , Ziang Gao , Xiang Xiao , Jianpeng Qin , Yalong Jiang","doi":"10.1016/j.enggeo.2025.108176","DOIUrl":"10.1016/j.enggeo.2025.108176","url":null,"abstract":"<div><div>The boreability of rock masses significantly affects tunnel construction efficiency and cost. To overcome limitations of existing empirical classification systems, this study introduces a quantitative boreability index (<em>BI</em><sub><em>p</em></sub>) based on rock chip characteristics, using new surface theory and image processing techniques including 3D scanning, segmentation, and fractal analysis. <em>BI</em><sub><em>p</em></sub> shows strong correlations with uniaxial compressive strength (<em>UCS</em>) and intactness index (<em>K</em><sub><em>v</em></sub>) (R<sup>2</sup> > 0.84), and aligns well with the field penetration index (<em>FPI</em>), minimizing the influence of non-geological factors. K-means clustering confirms clear associations between <em>BI</em><sub><em>p</em></sub> and cutter head wear rate (<em>ω</em><sub><em>c</em></sub>), enabling the development of a new boreability classification standard and a cutter wear risk warning mechanism. These results offer practical value for improving boreability assessment and equipment protection in shield tunnelling.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"354 ","pages":"Article 108176"},"PeriodicalIF":6.9,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144254717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An experimental study on gas-liquid phase fluid migration in hydrate-bearing sediments during hydrate dissociation 含水合物沉积物中水合物解离过程中气液相流体运移的实验研究

IF 6.9 1区工程技术

Engineering Geology Pub Date : 2025-06-06 DOI: 10.1016/j.enggeo.2025.108163

Yaobin Li , Xin Xin , Mengwei Liu , Yongkoo Seol , Yingli Xia , Huixing Zhu , Yilong Yuan , Tianfu Xu

{"title":"An experimental study on gas-liquid phase fluid migration in hydrate-bearing sediments during hydrate dissociation","authors":"Yaobin Li , Xin Xin , Mengwei Liu , Yongkoo Seol , Yingli Xia , Huixing Zhu , Yilong Yuan , Tianfu Xu","doi":"10.1016/j.enggeo.2025.108163","DOIUrl":"10.1016/j.enggeo.2025.108163","url":null,"abstract":"<div><div>Natural gas hydrate production tests face problems such as severe sand blockage, poor gas-liquid phase separation, and significant land subsidence. This is because of the insufficient understanding of the complex phase transition and gas-liquid multi-phase fluid migration during hydrate dissociation. In hydrate-bearing sediment systems, hydrate phase transition couples with gas-liquid fluid migration. The phase transition causes changes in pore structure, which in turn modifies porous infiltration parameters and fluid flow capacity. Meanwhile, alterations in phase interfaces affect key parameters like surface tension and wettability. Gas-liquid fluid migration influences heat and mass transfer, thus affecting phase equilibrium and dissociation rates. To bridge the gap in describing gas-liquid fluid migration during hydrate dissociation in experiments, this research innovatively integrated an unsteady-state gas displacement by water and a quantitative hydrate dissociation process, independently developed a multi-phase seepage experimental system suitable for hydrate dissociation and determined the relationship between seepage parameters and hydrate saturation under different porosity. The results are as follows: a) Core samples with higher initial porosity show a greater recovery rate of fluid flow capacity. b) The retarding effect of multi-phase fluid has a more significant impact on the migration of the wetting phase fluid (water) than that of the non-wetting phase fluid (methane). c) During hydrate dissociation, the evolution of absolute permeability shows an “S-shaped” pattern, and the evolution of relative permeability shows a “wiring-harness” pattern. The findings can provide a theoretical basis for preventing geological disasters and for geotechnical engineering design during hydrate production.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"354 ","pages":"Article 108163"},"PeriodicalIF":6.9,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144254718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0