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Characteristics and Influencing Factors of Microplastics in Snow in the Inner Mongolia Plateau, China

Engineering 2024年第6期37卷 69-77页

作者： Hongwei yu Junrong sha. Huawei jia Diga gang Baiwen Ma Chengzhi Hu State Key laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Changjia.g Survey PlanningDesign and Research Co.Ltd.Wuhan 430010China

Microplastics(MPs;<5 mm)have become one of the most prominent global environmental pollution *** can spread to high altitudes through atmospheric transport and can be deposited by rainfall or snowfall,potentially thre... 详细信息

Microplastics(MPs;global environmental pollution *** can spread to high altitudes through atmospheric transport and can be deposited by rainfall or snowfall,potentially threatening the structure and function of natural *** in terrestrial and aquatic ecosystems alter the growth and functional characteristics of ***,little attention has been given to the possible harm associated with MPs deposited in snow,particularly in the context of global climate *** collected from surface snow in the Inner Mongolia Plateau,China,were used for quantitative analysis and *** results showed that MPs were easily detected,and the related concentration was approximately(68±10)–(199±22)MPsl1 in snow *** were the most common morphology,the polymer composition was largely varied,and the abundance and composition of MPs were linked to human activity to a great ***-throughput sequencing results showed that the composition and abundance of microorganisms also differed in snow samples from areas with different MP pollution characteristics,indicating a considerable difference in microbial functional *** may have an interference effect on the individual growth and functional expression of microorganisms in *** addition,the results showed that functional living areas(e.g.,landfills and suburban areas)in cities play an important role in the properties of *** instance,the highest abundance of MPs was found in thermal power plants,whereas the abundance of polymers per sample was significantly lower in the suburban *** MP contaminants hidden in snow can alter microbial structure and function and are therefore a potential threat to ecosystem health.

关键词： Human activities Snow Microplastics Microbial community Urban function Environmental effect

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A direct electrochemical biosensor for rapid glucose detection based on nitrogen-doped carbon nanocages

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Rare Metals 2024年第5期43卷 2184-2192页

作者： lan-lan li yu Zhao li-jia Pan jian-Bin Xu Yi Shi College of Mechanical and Electrical Engineering Henan Agricultural UniversityZhengzhou 450002China School of Electronic Science and Engineering Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China Department of Electronic Engineering The Chinese University of HongKongHongkong 999077China

given the increasing number of diabetic patients,rapid and accurate detection of glucose in body fluids is *** study developed a direct electrochemical biosensor for glucose based on nitrogen-doped carbon nanocages(NCNCs).NCNCs possess a large specific surface area of 1395 m^(2)·g^(-1),a high N atomic content of 9.37%and good biocompatibility,which is favorable for enzyme loading and electron *** surface average concentration of electroactive glucose oxidase on NCNCs was 2.82×10^(-10)mol·cm^(-2).The NCNC-based direct electrochemical biosensor exhibited a high sensitivity of 13.7μA·(mmol·l^(-1))^(-1)·cm^(-2),rapid response time of 5 s and an impressive electron-transferrate constant(ks)of 1.87 s^(-1).Furthermore,we investigated an NCNC-based direct electron transfer(DET)biosensor for sweat glucose detection,which demonstrated tremendous promise for non-invasive wearable diabetes diagnosis.

关键词： Direct electron transfer(DET) Nitrogen-doped carbon nanocages(NCNCs) glucose oxidase Biosensor

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基于网络药理学及实验验证探究苗药虎掌草不同溶剂提取物抗前列腺癌活性及其作用机制

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天然产物研究与开发 2024年第7期36卷 1231-1241页

作者：黄丽荣余佳李娇程莎骆衡贵州理工学院食品药品制造工程学院贵阳550003 贵州医科大学药用植物功效与利用国家重点实验室贵州省天然产物研究中心贵阳550014

运用网络药理学预测结合实验验证研究苗药虎掌草不同溶剂提取物的抗前列腺癌活性及其作用机制。分别以水、75%乙醇和乙酸乙酯提取虎掌草获得粗提物,通过MTT法体外检测3种溶剂提取物对前列腺癌细胞PC3增殖的影响,流式细胞术检测其对细胞... 详细信息

运用网络药理学预测结合实验验证研究苗药虎掌草不同溶剂提取物的抗前列腺癌活性及其作用机制。分别以水、75%乙醇和乙酸乙酯提取虎掌草获得粗提物,通过MTT法体外检测3种溶剂提取物对前列腺癌细胞PC3增殖的影响,流式细胞术检测其对细胞凋亡的影响,评价提取物对PC3细胞的抑制作用;采用gC-MS分析乙酸乙酯提取物的化学成分;运用网络药理学分析虎掌草的活性成分及抗前列腺癌作用靶点,构建PPI网络,拓扑分析筛选核心靶点,通过gO生物功能富集和KEgg通路富集分析构建虎掌草抗前列腺癌的信号通路,预测潜在作用机制;利用RT-PCR检测虎掌草提取物对预测的TNF信号通路相关基因转录水平表达的影响,验证预测靶点,进一步分析作用机制。细胞实验表明,3种溶剂提取物对PC3细胞均具有较强的抑制增殖作用,且能显著诱导细胞凋亡(PgC-MS和网络药理学结果表明白桦脂酸和虎掌草皂苷D为提取物的主要药效成分,检索得到与抗前列腺癌相关的靶点89个,进一步筛选得到核心靶点15个,涉及AlB、JUN、HSP90AA1等靶点;gO功能富集涉及142个生物过程、28个细胞组成和41个分子功能,KEgg通路富集分析交集靶点主要涉及TNF、TRP、NF-κB、癌症通路等。RT-PCR靶点验证实验表明3种溶剂提取物均能显著影响TNF信号通路关键基因的表达,证明了网络药理学预测机制的可靠性。本研究揭示了虎掌草水、75%乙醇和乙酸乙酯提取物具有较强的抗前列腺癌活性,白桦脂酸和虎掌草皂苷D为主要药效成分,其作用机制可能与调控TNF、TRP、NF-κB、癌症通路等有关。

关键词：虎掌草提取物抗前列腺癌作用机制网络药理学实验验证

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Anion-induced electrolyte chemistry enables high energy density primary battery for ultralow-temperature conditions

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Science China Chemistry 2024年

作者： Zi-Hang Xue Hao-Jie l.a.g Yong-li Heng jia-lin Yang Edison Huixiang Ang Hong-Yan lü Hong yu Dong-Mei Dai Dai-Huo liu Chuan-yu Zheng Wei guo Xing-long Wu Department of Chemistry Northeast Normal University MOE Key laboratory for UV light-Emitting Materials and Technology Northeast Normal University Natural Sciences and Science Education National Institute of Education Nanyang Technological University State Key laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical University School of Chemistry and Chemical Engineering Henan Normal University Key laboratory of Organo-Pharmaceutical Chemistry of jia.gxi Province Gannan Normal University

lithium/fluorinated-carbon（li/CFx） primary batteries are widely used in defense and military fields due to their stable discharge plateau, low self-discharge rate, and adaptability across a wide temperature range. However, enhancing their overall energy density and discharge capacity at low temperatures remains a critical challenge. Herein, we report a strategically designed liBF4-based sulfite/carboxylate electrolyte, where the anion-involved solvation structure significantly enhances electrochemical kinetics by reducing the desolvation barrier. Simultaneously, it introduces a radical reaction mechanism that contributes to additional capacity. As a result, the li/CFxprimary batteries with this formulated electrolyte deliver a specific capacity of 2,257.15 mAh g-1at 25 °C. More importantly, when operating at -40 °C, the batteries exhibit an exceptionally high discharge capacity of 1,549.4 m Ah g-1and an energy density of 2,868.6 Wh kg-1. Even at -60 °C, the li/CFxcells achieve a specific capacity of 444.3 mAh g-1and an energy density of 821.8 Wh kg-1at 0.1 C, significantly outperforming previously reported organic-based liquid electrolytes. This work offers a viable strategy for enhancing the specific capacity and energy density of primary batteries in extreme environments, providing valuable insights for future developments.

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Data augmentation for bias correction in mapping PM_(2.5) based on satellite retrievals and ground observations

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geoscience Frontiers 2024年第1期15卷 17-28页

作者： Tan Mi Die Tang jianbo Fu Wen Zeng Michael l.grieneisen Zihang Zhou Fengju jia Fumo Yang yu Zhan College of Carbon Neutrality Future Technology Sichuan UniversityChengduSichuan 610065China Department of Environmental Science and Engineering Sichuan UniversityChengduSichuan 610065China Institute for Disaster Management and Reconstruction Sichuan UniversityChengduSichuan 610200China Department of land Airand Water ResourcesUniversity of CaliforniaDavisCA 95616United States Chengdu Academy of Environmental Sciences ChengduSichuan 610072China Sichuan Chengdu Ecological and Environment Monitoring Center ChengduSichuan 610011China

As most air quality monitoring sites are in urban areas worldwide,machine learning models may produce substantial estimation bias in rural areas when deriving spatiotemporal distributions of air *** bias stems from the issue of dataset shift,as the density distributions of predictor variables differ greatly between urban and rural *** propose a data-augmentation approach based on the multiple imputation by chained equations(MICE-DA)to remedy the dataset shift *** with the benchmark models,MICE-DA exhibits superior predictive performance in deriving the spatiotemporal distributions of hourly PM2.5 in the megacity(Chengdu)at the foot of the Tibetan Plateau,especially for correcting the estimation bias,with the mean bias decreasing from-3.4µg/m3 to-1.6µg/*** a complement to the holdout validation,the semi-variance results show that MICE-DA decently preserves the spatial autocorrelation pattern of PM2.5 over the study *** essence of MICE-DA is strengthening the correlation between PM2.5 and aerosol optical depth(AOD)during the data ***,the importance of AOD is largely enhanced for predicting PM2.5,and the summed relative importance value of the two satellite-retrieved AOD variables increases from 5.5%to 18.4%.This study resolved the puzzle that AOD exhibited relatively lower importance in local or regional *** results of this study can advance the utilization of satellite remote sensing in modeling air quality while drawing more attention to the common dataset shift problem in data-driven environmental research.

关键词： Aerosol optical depth Dataset shift Spatiotemporal Distribution Air quality monitoring Multiple imputation by chained equations

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槐定碱对脂多糖诱导的肺泡上皮细胞损伤的影响

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中国临床药理学杂志 2024年第12期40卷 1739-1743页

作者：贾亚杰齐馨馨魏玉熊莎武汉科技大学附属普仁医院重症医学科湖北武汉430081 武汉科技大学附属普仁医院药学部湖北武汉430081

目的探讨槐定碱通过调节高迁移率族蛋白l(HMgB1)-晚期糖基化终产物受体(RAgE)信号通路对脂多糖(lPS)诱导的肺泡上皮细胞损伤的影响。方法将体外培养的A549和HAECⅡ细胞随机分为5组:对照组、lPS组、lPS+槐定碱组、lPS+空载组、lPS+槐定碱... 详细信息

目的探讨槐定碱通过调节高迁移率族蛋白l(HMgB1)-晚期糖基化终产物受体(RAgE)信号通路对脂多糖(lPS)诱导的肺泡上皮细胞损伤的影响。方法将体外培养的A549和HAECⅡ细胞随机分为5组:对照组、lPS组、lPS+槐定碱组、lPS+空载组、lPS+槐定碱+HMgB1过表达组,除对照组外其余各组细胞以lPS诱导建立损伤模型,同时以槐定碱和质粒分组处理。以细胞计数试剂盒-8法、原位末端标记法检测各组细胞活力与凋亡率;以蛋白质印迹法检测各组细胞HMgB1和RAgE蛋白表达。结果对照组、lPS组、lPS+槐定碱组、lPS+空载组和lPS+槐定碱+HMgB1过表达组的A549细胞活力分别为(100.00±0.00)%、(56.73±8.31)%、(90.02±11.24)%、(53.26±9.15)%和(60.84±8.13)%,HAECⅡ细胞活力分别为(100.00±0.00)%、(50.86±7.56)%、(93.05±12.38)%、(54.10±8.42)%和(54.43±6.14)%,A549细胞凋亡率分别为(2.11±0.65)%、(42.46±5.20)%、(4.01±1.31)%、(44.74±4.93)%和(39.75±4.86)%,HAECⅡ细胞凋亡率分别为(2.30±0.72)%、(48.14±4.87)%、(3.83±1.23)%、(45.72±5.14)%和(44.81±5.25)%,A549细胞中HMgB1蛋白水平分别为0.16±0.02、0.87±0.13、0.19±0.04、0.89±0.11和0.84±0.12,RAgE蛋白水平分别为0.19±0.03、0.94±0.16、0.21±0.04、0.96±0.15和0.90±0.17,HAECⅡ细胞中HMgB1蛋白水平分别为0.13±0.04、0.79±0.10、0.15±0.04、0.80±0.14和0.75±0.12,RAgE蛋白水平分别为0.28±0.07、1.08±0.19、0.31±0.06、1.10±0.21和1.04±0.15。上述指标:lPS组与对照组比较,lPS+槐定碱组与lPS组比较,lPS+槐定碱+HMgB1过表达组与lPS+槐定碱组比较,在统计上差异均有统计学意义(均PgB1-RAgE信号活性而清除活性氧,减少炎症因子产生,增强抗氧化酶活性,进而抑制lPS诱导的肺泡上皮细胞炎症与氧化应激,最终减轻其细胞损伤。

关键词：槐定碱高迁移率族蛋白l-晚期糖基化终产物受体脂多糖肺泡上皮细胞损伤

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Iodine Nutrition, Thyroid-stimulating Hormone, and Related Factors of Postpartum Women from three Different Areas in China: A Cross-sectional Survey

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Biomedical and Environmental Sciences 2024年第3期37卷 254-265页

作者： sha. Xiao yun ZOU Yan HUANg li Chun jia.g sha. ZHOU Wei Wen QIN Qiu lan lIU Chang Qing lUO Xiao Yan lU jia Xi MAO De Qian lI Min YANg Zhen yu YANg li Chen Key laboratory of Trace Element Nutrition of National Health Committee National Institute for Nutrition and HealthChinese Center for Disease Control and PreventionBeijing 100050China Hunan Key laboratory of Typical Environmental Pollution and Health Hazards School of Public HealthHengyang Medical SchoolUniversity of South ChinaHengyang 241001HunanChina Zhejia.g Provincial Center for Disease Prevention and Control Hangzhou 310051ZhejiangChina guangxi Zhuang Autonomous Region Center for Disease Control and Prevention Nanning 530028GuangxiChina Hebei Provincial Center for Disease Control and Prevention Shijiazhuang 050021HebeiChina

Objective Studies on the relationship between iodine,vitamin A(VA),and vitamin D(VD)and thyroid function are *** study aimed to analyze iodine and thyroid-stimulating hormone(TSH)status and their possible relationships with VA,VD,and other factors in postpartum *** A total of 1,311 mothers(896 lactating and 415 non-lactating)from Hebei,Zhejia.g,and guangxi provinces were included in this *** urinary iodine concentration(UIC),TSH,VA,and VD were *** The median UIC of total and lactating participants were 142.00µg/l and 139.95µg/l,*** median TSH,VA,and VD levels in all the participants were 1.89 mIU/l,0.44μg/ml,and 24.04 ng/ml,*** differences in the UIC were found between lactating and non-lactating *** and TSH levels were significantly different among the three *** rural UIC was higher than the urban *** mothers had a higher UIC and a higher prevalence of excessive *** UICs and TSHs levels were observed in both the VD deficiency and insufficiency groups than in the VD-sufficient *** adjustment,no linear correlation was observed between UIC and VA/*** interaction was found between vitamins A/D and UIC on TSH *** The mothers in the present study had no iodine ***,area type,BMI,and VD may be related to the iodine status or TSH levels.

关键词： Median urinary iodine concentration Thyroid-stimulating hormone Vitamin A Vitamin D Postpartum women

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STCF conceptual design report (Volume 1): Physics & detector

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Frontiers of physics 2024年第1期19卷 1-154页

作者： M.Achasov X.C.Ai l.P.An R.Aliberti Q.An X.Z.Bai Y.Bai O.Bakina A.Barnyakov V.Blinov V.Bobrovnikov D.Bodrov A.Bogomyagkov A.Bondar I.Boyko Z.H.Bu F.M.Cai H.Cai J.J.Cao Q.H.Cao X.Cao Z.Cao Q.Chang K.T.Chao D.Y.Chen H.Chen H.X.Chen J.F.Chen K.Chen l.l.Chen P.Chen S.l.Chen S.M.Chen S.Chen S.P.Chen W.Chen X.Chen X.F.Chen X.R.Chen Y.Chen Y.Q.Chen H.Y.Cheng J.Cheng S.Cheng T.g.Cheng J.P.Dai l.Y.Dai X.C.Dai D.Dedovich A.Denig I.Denisenko J.M.Dias D.Z.Ding l.Y.Dong W.H.Dong V.Druzhinin D.S.Du Y.J.Du Z.g.Du l.M.Duan D.Epifanov Y.l.Fan S.S.Fang Z.J.Fang g.Fedotovich C.Q.Feng X.Feng Y.T.Feng J.l.Fu J.gao Y.N.gao P.S.ge C.Q.geng l.S.geng A.gilman l.gong T.gong B.gou W.gradl J.l.gu A.guevara l.C.gui A.Q.guo F.K.guo J.C.guo J.guo Y.P.guo Z.H.guo A.guskov K.l.Han l.Han M.Han X.Q.Hao J.B.He S.Q.He X.g.He Y.l.He Z.B.He Z.X.Heng B.l.Hou T.J.Hou Y.R.Hou C.Y.Hu H.M.Hu K.Hu R.J.Hu W.H.Hu X.H.Hu Y.C.Hu J.Hua g.S.Huang J.S.Huang M.Huang Q.Y.Huang W.Q.Huang X.T.Huang X.J.Huang Y.B.Huang Y.S.Huang N.Hüsken V.Ivanov Q.P.Ji J.J.jia S.jia Z.K.jia H.B.jia.g J.jia.g S.Z.jia.g J.B.jiao Z.jiao H.J.Jing X.l.Kang X.S.Kang B.C.Ke M.Kenzie A.Khoukaz I.Koop E.Kravchenko A.Kuzmin Y.lei E.levichev C.H.li C.li D.Y.li F.li g.li g.li H.B.li H.li H.N.li H.J.li H.l.li J.M.li J.li l.li l.li l.Y.li N.li P.R.li R.H.li S.li T.li W.J.li X.li X.H.li X.Q.li X.H.li Y.li Y.Y.li Z.J.li H.l.a.g J.H.l.a.g Y.T.l.a.g g.R.liao l.Z.liao Y.liao C.X.lin D.X.lin X.S.lin B.J.liu C.W.liu D.liu F.liu g.M.liu H.B.liu J.liu J.J.liu J.B.liu K.liu K.Y.liu K.liu l.liu Q.liu S.B.liu T.liu X.liu Y.W.liu Y.liu Y.l.liu Z.Q.liu Z.Y.liu Z.W.liu I.logashenko Y.long C.g.lu J.X.lu N.lu Q.F.lü Y.lu Y.lu Z.lu P.lukin F.J.luo T.luo X.F.luo Y.H.luo H.J.lyu X.R.lyu J.P.Ma P.Ma Y.Ma Y.M.Ma F.Maas S.Malde D.Matvienko Z.X.Meng R.Mitchell A.Nefediev Y.Nefedov S.l.Olsen Q.Ouyang P.Pakhlov g.Pakhlova X.Pan Y.Pan E.Passemar Y.P.Pei H.P.Peng l.Peng X.Y.Peng X.J.Peng K.Peters S.Pivovarov E.Pyata B.B.Qi Y.Q.Qi W.B.Qian Y.Qian C.F.Qiao J.J.Qin J.J.Qin l.Q.Qin X.S.Qin T.l.Qiu J.Rademacker C.F.Redmer H.Y.Sang Anhui University Hefei 230039China Beihang University Beijing 100191China Budker Institute of Nuclear Physics Novosibirsk 630090Russia CAS Key laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China Cavendish laboratory University of CambridgeJJ Thomson AveCambridge CB30HEUnited Kingdom Central China Normal University Wuhan 430079China Central South University Changsha 410083China China University of geosciences Wuhan 430074China China University of Mining and Technology Xuzhou 221116China École Polytechnique Fédérale de lausanne(EPFl) LausanneSwitzerland Fudan University Shanghai 200433China goethe University Frankfurt D-60325 Frankfurt am MainGermany guangxi Normal University Guilin 541004China guangxi Uninversity Nanning 530004China Hangzhou Institute for Advanced Study UCASHangzhou 310024China Hebei Normal University Shijiazhuang 050024China Hebei University Baoding 071002China Hefei University of Technology Hefei 230601China Helmholtz Institute Mainz Staudinger Weg 18D-55099 MainzGermany Henan Normal University Xinxiang 453007China Henan University Kaifeng 475004China High Energy Physics Center Chung-Ang UniversitySeoul 06974Korea Higher School of Economy 11 Pokrovsky Bulvar Moscow 109028Russia Huangsha. University Huangshan 245000China Hubei University of Automotive Technology Shiyan 442002China Hunan Normal University Changsha 410081China Hunan University of Science and Technology Xiangtan 411201China Hunan University Changsha 410082China Indiana University BloomingtonIndiana 47405USA Inner Mongolia University Hohhot 010021China Institute of Advanced Science Facilities Shenzhen 518107China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Institute of Physics Academia SinicaTaipeiTaiwan 11529China Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100190China Jilin University Changch

The superτ-charm facility(STCF)is an electron–positron collider proposed by the Chinese particle physics *** is designed to operate in a center-of-mass energy range from 2 to 7 geV with a peak luminosity of 0.5×10^(35) cm^(–2)·s^(–1) or *** STCF will produce a data sample about a factor of 100 larger than that of the presentτ-charm factory—the BEPCII,providing a unique platform for exploring the asymmetry of matter-antimatter(charge-parity violation),in-depth studies of the internal structure of hadrons and the nature of non-perturbative strong interactions,as well as searching for exotic hadrons and physics beyond the Standard *** STCF project in China is under development with an extensive R&D *** document presents the physics opportunities at the STCF,describes conceptual designs of the STCF detector system,and discusses future plans for detector R&D and physics case studies.

关键词： electron–positron collider tau-charm region high luminosity STCF detector conceptual design

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玉米芯纤维素基保水保肥材料的制备及性能研究

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应用化工 2024年第9期53卷 2066-2070+2077页

作者：张新浩李莎贾睿 YASSINE Mouham 罗钰邢建宇长安大学水利与环境学院长安大学旱区地下水文与生态效应教育部重点实验室长安大学水利部旱区生态水文与水安全重点实验室

使用玉米芯纤维素结合羧甲基化修饰制备高吸水性水凝胶，引入氨氮吸附功能，制备出一种高效保水保肥材料CCH/Z,通过SEM、FTIR、接触角等测试对其微观结构、官能团组成、亲水性进行了分析，并通过吸水溶胀实验和氨氮吸附实验，测试了合... 详细信息

使用玉米芯纤维素结合羧甲基化修饰制备高吸水性水凝胶，引入氨氮吸附功能，制备出一种高效保水保肥材料CCH/Z,通过SEM、FTIR、接触角等测试对其微观结构、官能团组成、亲水性进行了分析，并通过吸水溶胀实验和氨氮吸附实验，测试了合成材料的保水保肥性能。结果表明，CCH/Z保水率可达到452.49%,在保肥方面，当CCH/Z用量为0.15 g时，在100 mg/l氨氮溶液中，吸附率可达41.4%,准一级动力学模型、准二级动力学模型均可以描述吸附氨氮行为，热力学分析表明，CCH/Z的吸附行为符合Freundlich模型。

关键词：玉米芯纤维素保水材料保肥材料水凝胶

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循环加载下碎石层细观孔隙结构演化分析

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哈尔滨工业大学学报 2024年第6期56卷 116-123页

作者：贾羽丁瑜王晅张家生闫宏业张宇陈晓斌中南大学土木工程学院长沙410083 江苏海洋大学土木与港海工程学院江苏连云港222005 中南大学高速铁路建造技术国家工程研究中心长沙410083 中国铁道科学研究院集团有限公司北京100081

列车荷载作用下路基翻浆冒泥的实质是路基土体细颗粒迁移,细颗粒迁移会改变路基上覆碎石层孔隙结构,影响上覆碎石层力学及水力学性质。为此,采用自主研发的路基翻浆冒泥试验模型进行试验,结合X射线计算机断层(computed tomography, CT)... 详细信息

列车荷载作用下路基翻浆冒泥的实质是路基土体细颗粒迁移,细颗粒迁移会改变路基上覆碎石层孔隙结构,影响上覆碎石层力学及水力学性质。为此,采用自主研发的路基翻浆冒泥试验模型进行试验,结合X射线计算机断层(computed tomography, CT)扫描技术,分析循环荷载作用下路基土体细颗粒迁移对上覆碎石层细观孔隙结构的影响。结果表明:循环荷载作用下,碎石层孔隙的压缩作用及路基土体细颗粒迁移至碎石层的堵塞作用,不仅改变碎石层面孔隙率的分布特性,还减小碎石层孔隙率及孔隙连通度;孔隙尺寸分布特性不受加载影响,加载前后,碎石孔隙均呈现小孔隙多、大孔隙少的特点,孔隙分布特征曲线满足对数正态分布,但随着循环荷载的施加,碎石层内孔隙总数量减小;孔隙的形状参数(细长比和扁平度)均呈正态分布,细长比随循环荷载作用次数无明显变化规律,而加载后碎石层孔隙扁平度的分布更加均匀;碎石层孔隙具有明显的分形特性,加载前孔隙三维分形维数为2.40~2.50,随着循环荷载的施加,孔隙三维分形维数逐渐减小。

关键词： CT扫描技术循环荷载细颗粒迁移细观孔隙结构

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