Geofluids最新文献

筛选
英文 中文
A Simplified Settlement Calculation Method for Stiffened Deep Cement Mixing Pile Composite Foundation Under Embankment 路堤下加劲深层水泥搅拌桩复合地基沉降简化计算方法
IF 1.3 4区 地球科学
Geofluids Pub Date : 2026-07-31 DOI: 10.1155/gfl/6690426
Jian-lin Yu, Lin Hu-wen, Yang Xue-lin, Zhou Jia-jin, Mao Zi-hao, Guo Jin, Sheng Yue, Yan Wei, Zhu Jin
{"title":"A Simplified Settlement Calculation Method for Stiffened Deep Cement Mixing Pile Composite Foundation Under Embankment","authors":"Jian-lin Yu,&nbsp;Lin Hu-wen,&nbsp;Yang Xue-lin,&nbsp;Zhou Jia-jin,&nbsp;Mao Zi-hao,&nbsp;Guo Jin,&nbsp;Sheng Yue,&nbsp;Yan Wei,&nbsp;Zhu Jin","doi":"10.1155/gfl/6690426","DOIUrl":"https://doi.org/10.1155/gfl/6690426","url":null,"abstract":"<p>The stiffened deep cement mixing (SDCM) pile utilizes the advantages of the concrete pile and DCM column, and it has been widely used in construction and transportation projects. Nevertheless, the research on the theory of settlement analysis of SDCM pile composite foundation under embankment is relatively limited. In this paper, the three-dimensional numerical model of SDCM pile composite foundation under embankment was built based on the “typical section method,” and the influence of six dimensionless parameters, namely, relative load, core pile content ratio, core pile length ratio, replacement rate, pile-soil modulus ratio, and base-side soil modulus ratio, on the behavior of SDCM pile composite foundation was analyzed based on the simulation results. The orthogonal analysis method was then adopted to study the sensitivity of the average pile-soil stress ratio to the six dimensionless parameters, and the influencing degree was pile-soil modulus ratio &gt; relative load &gt; core pile content ratio &gt; replacement rate &gt; base-side soil modulus ratio &gt; core pile length ratio. In turn, a normalized prediction formula for the average pile-soil stress ratio was established. Finally, a simplified settlement calculation method for SDCM pile composite foundation under embankment was proposed, and the reasonableness of the proposed method was verified by three engineering projects.</p>","PeriodicalId":12512,"journal":{"name":"Geofluids","volume":"2026 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/gfl/6690426","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148617292","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}
引用次数: 0
Moisture Migration Law and Stability Analysis of Fissured Loess Cave Dwellings Subjected to Rainfall 降雨作用下裂隙性黄土窑洞的水分迁移规律及稳定性分析
IF 1.3 4区 地球科学
Geofluids Pub Date : 2026-07-31 DOI: 10.1155/gfl/7219189
Mengling Hu, Baojian Wen, Zheng Lu, Wenhao Xu, Xiaolong Zhang, Jianhua Gong, Zhibin Kuang, Like Qin
{"title":"Moisture Migration Law and Stability Analysis of Fissured Loess Cave Dwellings Subjected to Rainfall","authors":"Mengling Hu,&nbsp;Baojian Wen,&nbsp;Zheng Lu,&nbsp;Wenhao Xu,&nbsp;Xiaolong Zhang,&nbsp;Jianhua Gong,&nbsp;Zhibin Kuang,&nbsp;Like Qin","doi":"10.1155/gfl/7219189","DOIUrl":"https://doi.org/10.1155/gfl/7219189","url":null,"abstract":"<p>Loess cave dwellings are representative traditional earthen structures widely distributed in northwest China. Fissures extensively developed in loess can act both as structural weakness planes and as preferential pathways for rainfall infiltration. As a result, rainfall infiltration may readily induce instability in loess cave dwellings. However, the progressive water-induced instability mechanism of fissured loess cave dwellings remains insufficiently understood. In this study, typical loess cave dwellings in the Yan′an area were selected for investigation. A dual-medium seepage model was established to describe water exchange between the fissure and matrix domains. Based on this model, the moisture migration characteristics and stability evolution of the surrounding loess under rainfall infiltration were systematically analyzed, and the effects of fissure spatial parameters on wetting-induced degradation and instability were clarified. The results show that fissures dominate rainfall infiltration by forming preferential flow channels, leading to tongue-shaped water content contours in the surrounding loess. Fissured cave dwellings exhibit markedly lower stability than intact ones. Longer fissures and smaller dip angles intensify wetting and strength degradation around the cave arch, thereby increasing the risk of instability. Increasing the number of fissures expands the wetting zone; however, once the fissure spacing exceeds the hydraulic influence range, the maximum wetting depth is no longer controlled by the number of fissures. These findings reveal the water-induced instability mechanism of fissured loess cave dwellings and provide a theoretical basis for hazard prediction, early warning, and preventive protection in loess cave dwelling areas.</p>","PeriodicalId":12512,"journal":{"name":"Geofluids","volume":"2026 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/gfl/7219189","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148617297","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}
引用次数: 0
Fluid Inclusion Stratigraphy and Multistage Hydrocarbon Evolution in the Risha Gas Field, Jordan 约旦日沙气田流体包裹体地层学与多期油气演化
IF 1.3 4区 地球科学
Geofluids Pub Date : 2026-07-27 DOI: 10.1155/gfl/6037685
Mohamed Arafat, Fayez Ahmad, Abdelrahman Qteishat, Shu Jiang, Sherif Farouk, Khaled Al-Kahtany
{"title":"Fluid Inclusion Stratigraphy and Multistage Hydrocarbon Evolution in the Risha Gas Field, Jordan","authors":"Mohamed Arafat,&nbsp;Fayez Ahmad,&nbsp;Abdelrahman Qteishat,&nbsp;Shu Jiang,&nbsp;Sherif Farouk,&nbsp;Khaled Al-Kahtany","doi":"10.1155/gfl/6037685","DOIUrl":"https://doi.org/10.1155/gfl/6037685","url":null,"abstract":"<p>An integrated fluid inclusion stratigraphy (FIS) and petrographic analysis of the RH-3 well in the Risha Gas Field, Jordan, reveals a highly compartmentalized vertical fluid column. The upper section (1200–1750 m) is dominated by wet-gas to gas-condensate fluids, transitioning to dry gas below 1850 m. Petrographic observations indicate a thin oil or paleo-oil accumulation at 1221–1236 m, whereas a shallow anomaly at 133 m is consistent with possible microseepage from a nearby undrilled accumulation, though shallow-depth signals require cautious interpretation due to potential vadose-zone or microbial interference. Geochemical and isotopic data (<i>δ</i><sup>13</sup>C<sub>1</sub> ≈ −40‰) imply a catagenic origin from marine algal kerogen. Regional thermal modeling indicates that both the Ordovician Hiswa Formation and the Silurian Mudawwara Formation reached the dry gas window. The fluid inventory shows vertical compositional heterogeneity, with bacterial sulfate reduction (BSR) affecting shallow seeped hydrocarbons and thermochemical sulfate reduction (TSR) affecting deeper reservoirs, indicating different thermal regimes across the vertical profile. The study suggests that fluid compartmentalization and thermal maturity are influenced by the presence of multiple potential seals and a high local geothermal gradient (~5.0°C/100 m), although seal lithology, thickness, and lateral extent remain partially uncharacterized. These results provide constraints on reservoir compartmentalization, offer insights into the vertical distribution of hydrocarbon fluids, and contribute to an improved understanding of Paleozoic gas accumulation in the Risha area.</p>","PeriodicalId":12512,"journal":{"name":"Geofluids","volume":"2026 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/gfl/6037685","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148616034","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}
引用次数: 0
Metallogeny, Ore-Controlling Factors, and Deep Prospecting Indicators of Fluorite Deposits in Zhejiang Province, SE China: A Review 浙江萤石矿床成矿作用、控矿因素及深部找矿标志综述
IF 1.3 4区 地球科学
Geofluids Pub Date : 2026-07-25 DOI: 10.1155/gfl/3380945
Zhengpeng Ding, Peng Shao, Changrui Xu, Dong Wang
{"title":"Metallogeny, Ore-Controlling Factors, and Deep Prospecting Indicators of Fluorite Deposits in Zhejiang Province, SE China: A Review","authors":"Zhengpeng Ding,&nbsp;Peng Shao,&nbsp;Changrui Xu,&nbsp;Dong Wang","doi":"10.1155/gfl/3380945","DOIUrl":"https://doi.org/10.1155/gfl/3380945","url":null,"abstract":"<p>Zhejiang Province ranks among China′s premier fluorite-producing regions, with numerous deposits supplying strategic mineral resources. This paper synthesizes published literature on fluorite deposits in Zhejiang Province. We propose a classification framework dividing the deposits into four major metallogenic districts: Wuyi, Xianju, Lin′an, and Northwest Zhejiang, and further distinguish volcanic-hosted, granite-related, and carbonate-hosted styles using host lithology, orebody morphology, ore-controlling structures, mineral assemblages, geochemistry, and metallogenic age. Metallogenesis occurred during multiple Yanshanian episodes, with peak ages ranging from 70 to 90 Ma, systematically postdating magmatic activities by 20–60 Ma. Fluid inclusion data indicate that ore-forming fluids were predominantly low-salinity (&lt; 10 wt.% NaCl equiv.), medium–low temperature (100°C–250°C) H<sub>2</sub>O-NaCl-CO<sub>2</sub> systems derived mainly from meteoric water. Structural control represents the primary ore-controlling factor, with NE- and NW-trending faults serving as principal conduits and depositional sites. This synthesis provides a scientific basis for future exploration strategies.</p>","PeriodicalId":12512,"journal":{"name":"Geofluids","volume":"2026 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/gfl/3380945","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148616027","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}
引用次数: 0
Numerical Modeling on Pore-Scale Dynamics of Immiscible Air–Water Drainage in a Heterogeneous Micromodel 非均质微观模型中非混相气-水排水孔隙尺度动力学数值模拟
IF 1.3 4区 地球科学
Geofluids Pub Date : 2026-07-24 DOI: 10.1155/gfl/7207847
Sookyun Wang, Seon-Ok Kim, Minhee Lee
{"title":"Numerical Modeling on Pore-Scale Dynamics of Immiscible Air–Water Drainage in a Heterogeneous Micromodel","authors":"Sookyun Wang,&nbsp;Seon-Ok Kim,&nbsp;Minhee Lee","doi":"10.1155/gfl/7207847","DOIUrl":"https://doi.org/10.1155/gfl/7207847","url":null,"abstract":"<p>Immiscible displacement of water by air in a heterogeneous two-dimensional porous medium was numerically investigated using the phase-field method coupled with the Navier–Stokes equations. The pore geometry was reconstructed from a Berea sandstone image, and a series of numerical simulations was performed using the COMSOL Multiphysics platform. Simulation results showed that the drainage process unfolded in four distinct stages according to changes in pore-scale invasion behavior, air saturation, and capillary pressure. Air mainly invaded through larger and better connected pores, showing that the displacement process was strongly affected by viscous fingering under the given flow conditions (<i>C</i><i>a</i> = 8.47 × 10<sup>−4</sup>; <i>M</i> = 0.018). After the first breakthrough, the invasion rate became lower because the flow was concentrated along the main preferential pathway. Later, another rapid invasion occurred when pressure increased behind a narrow constriction and allowed air to enter a previously unswept upper region, which led to the second breakthrough. Residual water remained in dead-end pores and in regions surrounded by narrow throats. Variation in injection pressure showed different connectivity regimes, including no breakthrough, single-pathway breakthrough, and dual-pathway breakthrough. However, once the dual-breakthrough condition was reached, further increase in injection pressure gave only a small increase in the final air saturation. In addition, increasing the contact angle from strongly water-wet to near-neutral wetting reduced the time interval between the two breakthroughs, increased the equilibrium air saturation, and decreased the macroscopic capillary pressure. These results indicate that injection pressure and wettability together strongly influence breakthrough behavior, flow connectivity, and residual trapping, and that sequential capillary entry conditions play an important role in the transition between different displacement regimes in heterogeneous porous media.</p>","PeriodicalId":12512,"journal":{"name":"Geofluids","volume":"2026 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/gfl/7207847","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148616093","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}
引用次数: 0
Process-Based Hydrogeochemical Modeling of Water Quality in the Zagros Tunnel (Iran): Impacts of Geological Formation Leakage 伊朗扎格罗斯隧道水质过程水文地球化学模拟:地质地层渗漏的影响
IF 1.3 4区 地球科学
Geofluids Pub Date : 2026-07-18 DOI: 10.1155/gfl/7931673
Hossein Youzbashi, Hassan Ahmadi, Azita Behbahaninia, Farhad Hooshyaripor
{"title":"Process-Based Hydrogeochemical Modeling of Water Quality in the Zagros Tunnel (Iran): Impacts of Geological Formation Leakage","authors":"Hossein Youzbashi,&nbsp;Hassan Ahmadi,&nbsp;Azita Behbahaninia,&nbsp;Farhad Hooshyaripor","doi":"10.1155/gfl/7931673","DOIUrl":"https://doi.org/10.1155/gfl/7931673","url":null,"abstract":"<p>Zagros Tunnel (ZT), the main component of the Garmsiri Basin’s water transfer system, 46 km long and with a capacity of 45m<sup>3</sup>/s, has encountered postlining leakage and water quality deterioration. The leakage water is of poor quality, raising concerns that it may significantly deteriorate the quality of the water. In this study, given the vagueness of the leakage phenomenon, an uncertainty analysis was conducted to evaluate the role of leakage on the quality of water at the tunnel outlet, where the water is used for irrigation. The uncertainty of aquifer leakage and the specific hydrochemical behavior of the tunnel, along with the long length of the tunnel with four intermediate inlets, create a complex system and support the novelty of this investigation. In order to consider the leakage uncertainty, two scenarios were defined—(1) zero leakage and (2) constant leakage from the aquifer into the tunnel—and then, the QUAL2Kw model was used to simulate EC, T, DO, and pH throughout the system. According to the model’s outputs, in the second scenario, DO increases in the tunnel from 5.9 mg/L at the entrance to about 9.2 mg/L at the outlet. Moreover, despite the leakage’s high EC (~2700 <i>μ</i>S/cm), the outflow’s EC remains below 700 <i>μ</i>S/cm even in the second scenario. Thus, the exit water satisfies the agricultural water quality standard.</p>","PeriodicalId":12512,"journal":{"name":"Geofluids","volume":"2026 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/gfl/7931673","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148467627","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}
引用次数: 0
Full-Scale Pore Structure Characterization of the Late Permian Dalong Shale in Western Hubei, Southern China 鄂西晚二叠世大龙页岩全尺寸孔隙结构表征
IF 1.3 4区 地球科学
Geofluids Pub Date : 2026-07-13 DOI: 10.1155/gfl/4843079
Bei Liu, Yanlin Zhang, Wei Chen, Feng Li, Yaru Wen, Rui Lin
{"title":"Full-Scale Pore Structure Characterization of the Late Permian Dalong Shale in Western Hubei, Southern China","authors":"Bei Liu,&nbsp;Yanlin Zhang,&nbsp;Wei Chen,&nbsp;Feng Li,&nbsp;Yaru Wen,&nbsp;Rui Lin","doi":"10.1155/gfl/4843079","DOIUrl":"https://doi.org/10.1155/gfl/4843079","url":null,"abstract":"<p>The Late Permian Dalong Formation in western Hubei has recently been recognized as a promising target for shale gas development. However, the comprehensive characterization of its pore structure remains limited. To elucidate the pore system of the Dalong shale, an integrated experimental approach was applied to outcrop-derived samples. The analytical techniques utilized included total organic carbon (TOC) analysis, vitrinite reflectance (Ro) measurement, X-ray diffraction (XRD), helium porosimetry, field emission scanning electron microscopy (FE-SEM), low-pressure CO<sub>2</sub> and N<sub>2</sub> adsorption, and mercury intrusion porosimetry (MIP). The results show that the Dalong shale is rich in organic matter (OM) and brittle minerals and has reached an overmature evolutionary stage, with organic pores serving as its main reservoir space type. The total pore volume (PV) of the Dalong shale ranges from 0.0081 to 0.0443 cm<sup>3</sup>/g, which is mainly contributed by pores with a diameter of less than 10 nm; the total specific surface area (SSA) varies from 13.23 to 91.86 m<sup>2</sup>/g, with pores smaller than 2 nm in diameter being the primary contributor. TOC shows a positive correlation with pores smaller than 10 nm, whereas no significant statistical correlation exists between mineral composition and macropore volume for the studied samples. This study comprehensively reveals the pore structure characteristics of the Dalong shale in western Hubei at the microscopic scale, providing a scientific basis for the precise evaluation and development of shale gas resources in the subsequent exploration of the Dalong Formation.</p>","PeriodicalId":12512,"journal":{"name":"Geofluids","volume":"2026 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/gfl/4843079","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148467011","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}
引用次数: 0
Seepage Analysis of Groundwater in Three Dimensions: A Case Study From a Reservoir Dam Site in the Huaihe River Basin 地下水三维渗流分析——以淮河流域某水库坝址为例
IF 1.3 4区 地球科学
Geofluids Pub Date : 2026-07-07 DOI: 10.1155/gfl/8835048
Yafeng Zhang, Yiying Zhang, Jinshang Wang, Chi Sun
{"title":"Seepage Analysis of Groundwater in Three Dimensions: A Case Study From a Reservoir Dam Site in the Huaihe River Basin","authors":"Yafeng Zhang,&nbsp;Yiying Zhang,&nbsp;Jinshang Wang,&nbsp;Chi Sun","doi":"10.1155/gfl/8835048","DOIUrl":"https://doi.org/10.1155/gfl/8835048","url":null,"abstract":"<p>Reservoir seepage is a critical issue that must be addressed during the design phase of water conservancy projects. Based on engineering geological and hydrogeological investigations, a three-dimensional geological model was established for a dam site in the Huaihe River Basin. The permeability coefficients of the strata and rainfall infiltration parameters were validated through inverse analysis. Utilizing an equivalent continuum model and the finite element method, the seepage field and leakage volume at the reservoir dam site were analyzed and calculated. Furthermore, antiseepage treatment measures were investigated. The results indicate that, in the absence of a cutoff curtain, seepage at the dam site occurs primarily through the dam foundation and the F2 fault, with the dam foundation accounting for over 99% of the total leakage. After the installation of the cutoff curtain, the groundwater level dropped sharply within its influence range, leading to a significant reduction in leakage through both the dam foundation and the F2 fault. Consequently, their contributions to the total leakage were reduced to approximately 58% and 9%, respectively. The overall leakage volume was reduced by 92.4%, demonstrating the remarkable effectiveness of the antiseepage measure. It is recommended to raise the curtain bottom elevation to 290 m from the original design. Implementing this scenario leads to major savings in grouting work and capital investment.</p>","PeriodicalId":12512,"journal":{"name":"Geofluids","volume":"2026 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/gfl/8835048","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148462962","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}
引用次数: 0
Mechanical Behavior and Damage Modeling of Dolomite Under Drying–Wetting Cycles and Variable Lower Bound Cyclic Loading 干湿循环和变下界循环加载下白云岩力学行为及损伤建模
IF 1.3 4区 地球科学
Geofluids Pub Date : 2026-07-07 DOI: 10.1155/gfl/5592198
Xinqi Yang, Qihang Li, Yunmin Wang, Xiaoshuang Li, Jun Lu, Yanhong Xie
{"title":"Mechanical Behavior and Damage Modeling of Dolomite Under Drying–Wetting Cycles and Variable Lower Bound Cyclic Loading","authors":"Xinqi Yang,&nbsp;Qihang Li,&nbsp;Yunmin Wang,&nbsp;Xiaoshuang Li,&nbsp;Jun Lu,&nbsp;Yanhong Xie","doi":"10.1155/gfl/5592198","DOIUrl":"https://doi.org/10.1155/gfl/5592198","url":null,"abstract":"<p>To investigate the long-term stability of open-pit mine slopes under the coupled effects of seasonal rainfall-induced drying–wetting (D-W) cycles and mining-related transportation machinery loads, variable lower limit cyclic loading tests were conducted under a confining pressure of 1 MPa on intact dolomite specimens subjected to 0, 1, 5, 10, and 30 D-W cycles. The evolution of physical and mechanical properties, energy dissipation behavior, and failure modes was systematically investigated. Results show that water absorption increased significantly from 0.48% to 1.56% with an increasing number of D-W cycles, whereas the peak strength gradually decreased. Specifically, peak strain increased markedly in the early stage and then tended to stabilize. As the lower stress limit increased, the peak strength exhibited a quadratic trend. Moreover, when the lower stress limit was ≤ 15 MPa, cyclic loading produced a strengthening effect, with the peak strength increasing by up to 10.2%. The dissipated energy density increased significantly with the number of D-W cycles, and a damage constitutive model—derived primarily from theoretical analysis and refined through empirical correction—was established. Moreover, increasing the lower stress limit promoted a transition in the macroscopic failure mode from tensile to shear failure, which was further intensified by D-W cycling.</p>","PeriodicalId":12512,"journal":{"name":"Geofluids","volume":"2026 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/gfl/5592198","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148463135","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}
引用次数: 0
Mechanism of Deep Brine Potash Enrichment in the Damenkou Area, Qaidam Basin, by Tectonic-Sedimentary Coupling 构造-沉积耦合作用下柴达木盆地大门口地区深盐水钾富集机理
IF 1.3 4区 地球科学
Geofluids Pub Date : 2026-06-29 DOI: 10.1155/gfl/6385249
Xiaolong Han, Hongping Lei, Sheng He, Zhong Sun, Yinbing Wang, Fachang Xia, Jianjun Hou, Peilong Zhang
{"title":"Mechanism of Deep Brine Potash Enrichment in the Damenkou Area, Qaidam Basin, by Tectonic-Sedimentary Coupling","authors":"Xiaolong Han,&nbsp;Hongping Lei,&nbsp;Sheng He,&nbsp;Zhong Sun,&nbsp;Yinbing Wang,&nbsp;Fachang Xia,&nbsp;Jianjun Hou,&nbsp;Peilong Zhang","doi":"10.1155/gfl/6385249","DOIUrl":"https://doi.org/10.1155/gfl/6385249","url":null,"abstract":"<p>In recent years, the Damenkou Area in the Qaidam Basin has been identified as an important area for deep-brine potash resource exploration. Previous studies on the origin of the deep basin brine have mostly focused on known mining areas. However, there is still a lack of understanding of how tectonics and sedimentation jointly control K<sup>+</sup> enrichment in the Damenkou Area. In this tectonically unique region, three uplifts confine a single depression. This paper investigates the occurrence characteristics and formation mechanisms of deep brine by combining hydrogeological drilling and geophysical surveys with hydrochemical and isotopic analyses in the study area. The results show the following: (1) Three uplifts and one depression tectonically control the study area. More specifically, the Niubei Fault Zone and the Niubei Buried Hill together constitute a reservoir system. The alluvial–pluvial sand and gravel layer of the Lower Pleistocene Aral Formation forms the main brine reservoir, and the Upper Pliocene Shizigou Formation is the secondary reservoir. (2) The deep brine layer is shallow in the north and deep in the south, thick in the west, and thin in the east. The brine is chloride-type, with a precipitation sequence of halite → sylvite → carnallite → bischofite. (3) K<sup>+</sup> and Cl<sup>–</sup> enrichment is controlled by tectonic-sedimentary coupling. The Niubei Buried Hill blocks the backflow of intercrystalline brine in the depositional center, whereas the Niubiziliang anticline structure hinders brine migration to the west. These factors, together with the porosity zoning of the alluvial–pluvial fan sand and gravel layer (high porosity in the north and low in the south), collectively drive the stepwise enrichment of evaporite minerals. (4) Saline rock strata have been continuously leached by paleo-atmospheric precipitation in a closed environment, resulting in highly mineralized brine, which is characterized by little transformation and strong reduction. This study provides a key theoretical basis for regional deep brine resource exploration by systematically clarifying, for the first time, the tectonic-sedimentary coupling control on mineralization in the Damenkou Area.</p>","PeriodicalId":12512,"journal":{"name":"Geofluids","volume":"2026 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/gfl/6385249","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148386926","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}
引用次数: 0
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信
小红书