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SSRN 2023年

作者： Li, Peng Li, Yinping Shi, Xilin Wei, XinXing Yang, Kun Ma, Hongling Yang, Chunhe Hu, Wei Xu, Hao State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan430071 China University of Chinese Academy of Sciences Beijing100049 China Hubei Key Laboratory of Geo-Environmental Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan430071 China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing400044 China SINOPEC Research Institute of Petroleum Engineering Co. Ltd Hubei Qianjiang430071 China SINOPEC Gas Storage Company Henan Zhengzhou450000 China

Deformation stability plays a crucial role in the construction and operation of hydrocarbon storage salt caverns. Monitoring and analyzing wellhead pressure data under closed well conditions provide valuable insights into the evaluation of cavern stability. In this study, we comprehensively analyzed five factors that influence the changes of internal brine pressure. Our analyses revealed that salt creep and brine thermal expansion contribute to an increase in internal brine pressure. Conversely, brine penetration, salt dissolution and cavern compressibility lead to a decrease in internal brine pressure. Additionally, we examined three factors that influence wellhead pressure fluctuations, namely atmospheric pressure, surface temperature and earth tides. Through the analysis of the wellhead pressure data of Jianghan salt cavern under closed conditions, we computed the creep parameters of salt formations using the Norton-Hoff creep model. To further understand the behavior of the brine-filled salt cavern, we conducted numerical simulations to analyze the distribution of brine temperature and the deformation stability. Our findings indicated that the brine temperature rise, influenced by heat conduction, occurs at a very slow rate. The volumetric average temperature of the brine exhibits a non-linear increase over time, with a rapid rise in the initial stage followed by a slower rate of change. Eventually, the brine temperature stabilizes and approaches the formation temperature. Based on the deformation analysis of the brine-filled salt cavern, we observed that the closed condition is more favorable for maintaining cavern stability compared to the open condition. The subsidence of the cavern roof is particularly sensitive and requires careful attention, especially for flat-roof salt caverns. Under closed conditions, it is crucial to control the rate of brine pressure decrease and prevent excessively high brine pressure to ensure the mechanical and penetration stabilit

关键词： Atmospheric pressure

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Spatiotemporal Distribution of Microplastics in the Ganjiang River (Ganzhou Section): Insight into the Source Area Impact

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SSRN 2022年

作者： Qin, Xinxin Sun, Nan Teng, Wenxi Zhu, Yichun Liu, Zuwen Li, Wentao Dong, Huiyu Qiang, Zhimin Zeng, Jinfeng Lian, Junfeng Jiangxi Provincial Key Laboratory of Environmental Geotechnology and Engineering Disaster Control Jiangxi University of Science and Technology 1958 Ke-jia Road Ganzhou341000 China Ganzhou Key Laboratory of Basin Pollution Simulation and Control Jiangxi University of Science and Technology 1958 Ke-jia Road Ganzhou341000 China School of Life Sciences Jinggangshan University Ji’an343009 China Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences 18 Shuang-qing Road Beijing100085 China Hydrology and Water Resources Monitoring Center for Ganjiang Upstream Watershed 8 Zhang-jia-wei Road Ganzhou341000 China

The accumulation of microplastic (MP) pollution in rivers has become a global concern;however, the underlying mechanism for spatiotemporal effects on MPs remains unclear. This study investigated the Ganjiang River source area with a field survey and found relatively low MP abundances in the target rivers (3.47 ± 0.95 items/L) owing to the small background in the riverine source area. The average MP abundance in the dry season (10.9 ± 2.33 items/L) was higher than that in the middle wet season (3.47 ± 0.95 items/L), and small MPs were prone to scouring from land. Within the predominant MP shape (fiber and fragment), size (0.125–0.5 mm), and colour (polychrome and white) distribution, the contribution of functional areas was as follows: industrial > scenic > residential > natural area. MP abundances fluctuated with different rainfall levels in the wet season, while during the period when the river flow was manually regulated, a good linear relationship was observed between river flow and MP abundance, suggesting that land scouring and transportation may play a more important role than other factors. The upper river regions predominated in the group in which the average MP abundance in the dry season was higher than that in the wet season. The small watershed area in the upstream region would lead to a low terrestrial MP number, making it easy for MP content in rivers to reach a platform. This work contributes to the understanding of MP distribution in freshwater and provides a potential guideline for MP control. © 2022, The Authors. All rights reserved.

关键词： Microplastic

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Experimental determination on the critical angle of seismic incidence of curved bridge 42

Experimental determination on the critical angle of seismic ...

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42nd International Conference on Vibroengineering

作者： Deng, Tongfa Li, Weibin Feng, Ruiwei Wang, Yi Jiangxi Provincial Key Laboratory of Environmental Geotechnical Engineering and Disaster Control Jiangxi University of Science and Technology Jiangxi341000 China School of Architecture and Surveying and Mapping Engineering Jiangxi University of Science and Technology Jiangxi341000 China State Key Laboratory of Disaster Reduction in Civil Engineering Tongji University Shanghai200092 China

The shaking table model test mainly focuses on the study of seismic response law, aseismic performance and seismic damping and isolation effect of bridges with a single or multi-platform shaking table. Basically, the plane principal axis direction is adopted for the seismic input of structural models. Little research effort considering multi-angle seismic input has been reported in the structural model test. In this paper we designed and conducted a small-scale shaking table model test to study the seismic response law of the curved girder bridges with seismic input at different angles, and provided experimental verification for the theoretical method of the most unfavorable angle of seismic input. The experimental results show that the variation trend of component response to variation of the seismic input direction is consistent with that of the numerical analysis, which indicates that the designed device is effective. © 2019 Tongfa Deng, et al.

关键词： Seismic response

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Multi-site synergistic relay electrocatalysis with high-entropy nanoalloys for effective nitrate reduction to ammonia

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Chinese Chemical Letters 2025年

作者： Anni Wu Chengyi Hong Hu Zheng Wei Teng Department of Geotechnical Engineering College of Civil Engineering Tongji University Shanghai 200092 China State Key Laboratory for Pollution Control School of Environmental Science and Engineering Shanghai Institute of Pollution Control and Ecological Security China Key Laboratory of Urban Water Supply Water Saving and Water Environment Governance in the Yangtze River Delta of Ministry of Water Resources Tongji University Shanghai 200092 China Department of Civil and Environmental Engineering Carnegie Mellon University Pittsburgh Pennsylvania 15213 United States Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education State Key Laboratory of Disaster Reduction in Civil Engineering Tongji University Shanghai 200092 China

Electrocatalytic reduction of nitrate to ammonia offers an environmentally friendly and sustainable approach for ammonia production, but it involves a multi-step reaction process with complex intermediates, and still faces the challenge of high activity and high selectivity. Herein, a high-entropy nanoalloy was synthesized via high-temperature annealing of metal salt with dopamine as a carbon source for electrocatalytic reduction of nitrate to ammonia. The FeCoNiCuRu 1.5 /C catalyst displays a conversion rate of 90.2% and an ammonia selectivity of 92.2% at -0.74 V ( vs. RHE), significantly surpassing the performance of low-entropy alloys such as FeCo/C by 1.5-2 times. Moreover, FeCoNiCuRu 1.5 /C maintains a consistent nitrate conversion rate of about 90.0% after 120 h of continuous operation (10 cycles), indicating high stability. The superior performance of FeCoNiCuRu 1.5 /C can be attributed to the synergetic relay catalysis among Fe, Co, Ni, Cu, and Ru sites. This synergy enhances nitrate adsorption due to the optimized electronic structure of multiple active sites, which facilitates the nitrate reduction to intermediates. Subsequently, the effective active hydrogen produced at the Ru site, in conjunction with adjustments at other metal sites, promotes the selective transformation of the intermediates into ammonia. This work not only highlights the efficacy of synergetic relay electrocatalysis but also opens new avenues for developing highly efficient multi-site catalysts.

关键词： Electrocatalysis High-entropy alloy Nitrate reduction Ammonia Active hydrogen

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Enhanced Field Burning Derived Aerosols Across the Southeastern Tibetan Plateau in Spring

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SSRN 2022年

作者： Xiao, Yangning Xiao, Hongwei Sun, Qibin Zhao, Bei Xiao, Huayun School of Environmental Science and Engineering Shanghai Jiaotong University Shanghai200240 China Jiangxi Province Key Laboratory of the Causes and Control of Atmospheric Pollution Nanchang330013 China School of Water Resources and Environmental Engineering East China University of Technology Nanchang330013 China School of Atmospheric Sciences Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies Institute of Earth Climate and Environment System Sun Yat-sen University Zhuhai519082 China Beijing100083 China

The Tibetan Plateau is the third pole of the world, regulating the climate of the northern hemisphere. Previous studies suggested that the atmospheric aerosols over Tibetan Plateau were obviously influenced by the BB transported from South and Southeast Asia. Field burning is also an important form of BB in Southeast Asian countries. Every spring there is serious air pollution caused by field burning. However, there are still scientific gaps in the contribution of field burning to surrounding regional aerosols, especially on the Tibetan Plateau. To further identify the influence of field burning on the aerosols over the Southeastern Tibetan Plateau, we collected the PM 2.5 samples and then analyzed the concentrations of TC and TN and their isotope during the March to June on Southeastern Tibetan Plateau. The δ 13 C and δ 15 N results showed that there was no significant difference (p > 0.05) between the field burning and the non-field burning periods. Furthermore, both δ 13 C and δ 15 N values were similar to the BB value, indicated the TC and TN were primarily derived from BB whether field burning or non-field burning periods. The concentrations of TC, and TN (6.5 ± 2.9 µg m -3 , and 1.2 ± 0.4 µg m -3 respectively) during the field burning period (March to April) were significantly higher than during the non-field burning period (4.1 ± 1.7 µg m -3 , p= 0.014;and 0.7 ± 0.3 µg m -3 , p= 0.013, respectively). The active fires data, the smoke surface concentrations, backward trajectory, further indicated that the BB emissions from Southeast Asia during field burning period higher than during non-field burning period. This suggests that high BB emissions had significantly enhanced atmospheric aerosols concentrations and chemical composition in Southeastern Tibetan Plateau during the field burning period. © 2022, The Authors. All rights reserved.

关键词： Isotopes

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Enhanced Field Burning Derived Aerosols Across the Southeastern Tibetan Plateau in Spring

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SSRN 2022年

作者： Xiao, Yang-Ning Xiao, Hong-Wei Sun, Qi-Bin Zhao, Bei Xiao, Hua-Yun School of Environmental Science and Engineering Shanghai Jiaotong University Shanghai200240 China Jiangxi Province Key Laboratory of the Causes and Control of Atmospheric Pollution Nanchang330013 China School of Water Resources and Environmental Engineering East China University of Technology Nanchang330013 China School of Atmospheric Sciences Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies Institute of Earth Climate and Environment System Sun Yat-sen University Zhuhai519082 China Beijing100083 China

The Tibetan Plateau is the third pole of the world, regulating the climate of the northern hemisphere. Previous studies suggested that the atmospheric aerosols over Tibetan Plateau were obviously influenced by the BB transported from South and Southeast Asia. In fact, field burning is also an important form of BB in Southeast Asian countries. Every spring there is serious air pollution caused by field burning. However, there are still scientific gaps in the contribution of field burning to surrounding regional aerosols, especially on the Tibetan Plateau. To further identify the influence of field burning on the aerosols over the Southeastern Tibetan Plateau, we collected the PM2.5 samples and then analyzed the concentrations of TC and TN and their isotope during the March to June on Southeastern Tibetan Plateau. The δ13C and δ15N results showed that there was no significant difference (p > 0.05) between the field burning and the non-field burning periods. Furthermore, both δ13C and δ15N values were similar to the BB value, indicated the TC and TN were primarily derived from BB whether field burning or non-field burning periods. The concentrations of TC, and TN (6.5 ± 2.9 µg m-3, and 1.2 ± 0.4 µg m-3 respectively) during the field burning period (March to April) were significantly higher than during the non-field burning period (4.1 ± 1.7 µg m-3, p= 0.014;and 0.7 ± 0.3 µg m-3, p= 0.013, respectively). The active fires data, the smoke surface concentrations, backward trajectory, further indicated that the BB emissions from Southeast Asia during field burning period higher than during non-field burning period. This suggests that high BB emissions had significantly enhanced atmospheric aerosols concentrations and chemical composition in Southeastern Tibetan Plateau during the field burning period, which may further affect the plateau biodiversity and ecosystem. © 2022, The Authors. All rights reserved.

关键词： Nitrogen

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Techno-economic analysis of compressed air energy storage in abandoned salt caverns: A case study in China

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Renewable Energy 2025年 254卷

作者： Rui Liang Hongling Ma Hang Li Xuan Wang Zhen Zeng Zhuyan Zheng Wentao Li Yashuai Huang Kai Zhao State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan 430071 China University of Chinese Academy of Sciences Beijing 100049 China Hubei Key Laboratory of Geo-Environmental Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan 430071 China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing 400044 China

To support the large-scale integration of renewable energy, this study evaluates the technical and economic feasibility of utilizing China's abundant abandoned salt caverns for compressed air energy storage (CAES). In contrast to existing studies that focus on newly constructed caverns under idealized conditions, this work investigates the mechanical behavior and reconstruction potential of abandoned caverns, which typically exhibit irregular geometries and complex stress histories. A 3D geomechanical model of the bedded salt formation in Pingdingshan is developed to simulate the cavern deformation during cyclic gas injection and withdrawal. A comprehensive stability evaluation system is proposed, including displacement, equivalent strain, safety factor, and volume shrinkage. The results indicate that a minimum operating pressure range of 9–12 MPa is recommended to ensure cavern stability. From an economic perspective, the levelized cost of electricity (LCOE) for CAES systems utilizing abandoned caverns and newly constructed caverns is estimated at $0.077/kWh and $0.081/kWh, respectively. Furthermore, scenario analyses based on China's solar, wind, and salt cavern resources indicate that, if the energy storage proportion reaches 10%, and 20% of caverns formed before 2020 and 50% after 2020 are reconstructed for CAES, the total investment cost would reach $3526.2 million by 2050. The findings indicate that utilizing abandoned salt caverns for CAES is technically and economically feasible, providing valuable insights for energy storage deployment in other regions.

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Optimizing deep learning-driven computer vision for civil infrastructure defect Identification: Challenges and strategies

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engineering Applications of Artificial Intelligence 2025年 158卷

作者： Ronghua Fu Zhimeng Huang Maosen Cao Drahomír Novák Chunhui Xie Jinwen Huang College of Mechanics and Engineering Science Hohai University Nanjing China National Engineering Research Center of Visual Technology School of Computer Science Peking University Beijing China Institute of Structural Dynamics and Control Hohai University Nanjing China Jiangxi Province Key Laboratory of Environmental Geotechnical Engineering and Hazards Control Jiangxi University of Science and Technology Ganzhou China Institute of Structural Mechanics Faculty of Civil Engineering Brno University of Technology Brno Czech Republic

With advancements in Internet of Things (IoT) technologies and deep learning, Structural Health Monitoring (SHM) is progressing towards long-distance and intelligent applications. To promote the widespread adoption of deep learning in vision-based SHM, this survey compiles optimization strategies derived from deep learning models specifically designed for defect identification in civil infrastructure—an area that has not been comprehensively explored. First, a concise overview of fundamental deep learning models for vision-based defect identification is provided. Next, optimization methods are categorized into three main groups, each addressing a distinct challenge encountered in practical vision-based SHM: optimizing considering defect-specific characteristics, lightweight design for real-time identification, and enhance robustness under complex environmental conditions. These methods are further classified systematically based on their similar features. This survey offers researchers a deeper understanding of the challenges in vision-based defect identification and assists them in selecting appropriate optimization techniques to address these challenges. Ultimately, it aims to enhance the effective deployment of deep learning models in vision-based SHM by improving accuracy, enabling real-time operation, and facilitating automated defect identification.

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Corrigendum to “Carbon and energy storage in salt caverns under the background of carbon neutralization in China” [Energy 272 (2023) 127120]

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Energy 2024年 295卷

作者： Xinxing Wei Shengnan Ban Xilin Shi Peng Li Yinping Li Shijie Zhu Kun Yang Weizheng Bai Chunhe Yang State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan Hubei 430071 China University of Chinese Academy of Sciences Beijing 100049 China Hubei Key Laboratory of Geo-Environmental Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan 430071 China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing 400044 China

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Acoustic emission characteristics of rock salt under multistage creep-fatigue loading at various temperatures

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Journal of Rock Mechanics and geotechnical engineering 2025年

作者： Hang Li Chunhe Yang Hongling Ma Jiangyu Fang Rui Liang Wentao Li Kai Zhao J.J.K. Daemen State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing 400044 China School of Resources and Safety Engineering Chongqing University Chongqing 400044 China State Key Laboratory of Geomechanics and Geotechnical Engineering Safety Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan 430071 China University of Chinese Academy of Sciences Beijing 100049 China Hubei Key Laboratory of Geo-Environmental Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan 430071 China Mackay School of Earth Sciences and Engineering University of Nevada Reno NV 89557 USA

With the growing global demand for energy, deep underground salt caverns are emerging as a potential solution for large-scale energy storage. In this study, multistage cyclic loading tests were conducted on rock salt at different temperatures in combination with real-time acoustic emission (AE) monitoring. The results show that the cumulative AE count increases stepwise with increasing cyclic stress. The peak frequency is concentrated primarily in the medium-frequency range, exhibiting a band distribution across low-, medium-, and high-frequency ranges. As the temperature increases, the proportion of low-frequency signals decreases from 14.32% to 5.76%, whereas the proportion of medium-frequency signals increases from 85.48% to 94.1%. The proportion of high-frequency signals remains relatively constant between 0.1% and 0.2%. The amplitude-count relationship of the AE signals demonstrates a strong negative power-law correlation. Furthermore, with increasing temperature, the negative power-law exponent of the amplitude gradually decreases, with the b value decreasing from 1.096 to 0.837 and the a value decreasing from 7.4871 to 6.6982. Under all four temperature conditions, the dominant failure mode in rock salt is tensile cracking. However, as the temperature increases, the proportion of tensile cracks decreases from 88.59% to 75.12%, whereas the proportion of shear cracks at 80 °C is nearly double that at 20 °C. This finding indicates that as the temperature increases, the ductility of the material increases, and the crack propagation mode shifts from tensile to shear. This research provides valuable insights for the design and stability assessment of salt cavern reservoirs for deep underground energy storage systems.

关键词： Rock salt Cyclic loading Temperature Acoustic emission (AE) Crack type

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