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Dynamic prediction of over-excavation gap due to posture adjustment of shield machine in soft soil

Underground Space 2024年第3期16卷 44-58页

作者： Wenyu Yang junjie zheng Rongjun Zhang Sijie Liu Wengang Zhang School of Civil and Hydraulic Engineering Huazhong University of Science and TechnologyWuhan 430074China School of Civil Engineering Wuhan UniversityWuhan 430072China School of Civil Engineering Chongqing UniversityChongqing 400045China

The probability analysis of ground deformation is becoming a trend to estimate and control the risk brought by shield *** gap parameter is regarded as an effective tool to estimate the ground loss of tunnelling in soft *** specifically,x,which is a gap parameter component defined as the over(or insufficient)excavation due to the change in the posture of the shield machine,may contribute more to the uncertainty of the ground ***,the existing uncertainty characterization methods for x have several limitations and cannot explain the uncertain correlations between the relevant *** these lines,to better characterize the uncertainty of x,the multivariate probability distribution was developed in this work and a dynamic prediction was proposed for *** attain this goal,1523 rings of the field data coming from the shield tunnel between Longqing Road and Baiyun Road in Kunming Metro Line 5 were utilized and 44 parameters including the construction,stratigraphic,and posture parameters were collected to form the *** to the variance filter method,the mutual information method,and the value of the correlation coefficients,the original 44 parameters were reduced to 10 main parameters,which were unit weight,the stoke of the jacks(A,B,C,and D groups),the pressure of the pushing jacks(A,C groups),the chamber pressure,the rotation speed,and the total *** multivariate probability distribution was constructed based on the Johnson system of ***,the distribution was satisfactorily verified in explaining the pairwise correlation between x and other parameters through 2 million simulation *** last,the distribution was used as a prior distribution to update the marginal distribution of x with any group of the relevant parameters *** performance of the dynamic prediction was further validated by the field data of 3 shield tunnel cases.

关键词： Shield tunnel Ground loss Gap parameter Multivariate probability distribution Bayesian updating Dynamic prediction

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Biomineralization of soil with crude soybean urease using different calcium salts

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第5期16卷 1788-1798页

作者： Yajie Weng junjie zheng Hanjiang Lai Mingjuan Cui Xingzhi Ding School of Civil and Hydraulic Engineering Huazhong University of Science and TechnologyWuhan430074China Zijin School of Geology and Mining Fuzhou UniversityFuzhou350108China College of Civil Engineering Fuzhou UniversityFuzhou350116China

Calcium salt is an important contributing factor for calcium-based *** study the effect of calcium salt on soil biomineralization using crude soybean urease,the calcium salts,including the calcium chloride (CaCl_(2)),calcium acetate ((CH_(3)COO)_(2)Ca) and calcium nitrate (Ca(NO_(3))_(2)),were used to prepare the biotreatment solution to carry out the biomineralization tests in this *** series of biomineralization tests in solution and sand column,respectively,were *** electron microscopy (SEM) and X-ray diffraction (XRD) were performed to determine the microscopic characteristics of the precipitated calcium carbonate (CaCO_(3)) *** experimental results indicate that the biomineralization effect is the best for the CaCl2 case,followed by (CH_(3)COO)_(2)Ca,and worst for Ca(NO_(3))_(2) under the test conditions of this study (i.e.1 mol/L of calcium salt-urea).The mechanism for the effect of the calcium salt on the biomineralization of crude soybean urease mainly involves: (1) inhibition of urease activity,and (2) influence on the crystal size and morphology of CaCO_(3).Besides Ca^(2+) ,the anions in solution can inhibit the activity of crude soybean urease,and NO_(3)− has a stronger inhibitory effect on the urease activity compared with both CH_(3)COO^(−) and Cl^(−) .The co-inhibition of Ca^(2+) and NO_(3)− on the activity of urease is the key reason for the worst biomineralization of the Ca(NO_(3))_(2) case in this *** difference in biomineralization between the CaCl_(2) and (CH_(3)COO)_(2) Ca cases is strongly correlated with the crystal morphology of the precipitated CaCO_(3).

关键词： Biomineralization Crude soybean urease Calcium salt Influence mechanism

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Damage degradation mechanism and macro-meso structural response of mudstone after water wetting

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Journal of Mountain Science 2024年第8期21卷 2825-2843页

作者： SHAO Zhixin SONG Yanqi zheng junjie SHEN Fuxin LIU Chuanpeng YANG Juntao School of Mechanics and Civil Engineering China University of Mining and Technology(Beijing)Beijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining&Technology(Beijing)Beijing 100083China

The predominant presence of weak interlayers primarily composed of mudstone renders them highly susceptible to a reduction in bearing capacity due to the water-rock weakening effect,significantly impacting the safety of open-pit mining *** study focuses on the weak mudstone layers within open-pit mine *** mineral composition of mudstone and the microstructure evolution characteristics before and after water wetting were analyzed by X-ray diffraction(XRD)and scanning electron microscope(SEM).The meso-structure and parameter variation characteristics of mudstone interior space after water-rock interaction were quantified by computed tomography scanning test,and the damage variable characterization method was ***,according to the uniaxial compression test,the degradation characteristics of the macroscopic mechanical behavior of mudstone under different water wetting time were explored,and the elastic modulus and strength attenuation model of mudstone based on mesoscopic damage were ***,building upon the macro-meso structural response characteristics of mudstone,an exploration of the failure characteristics and deterioration mechanism under the influence of water-rock interactions was *** results show that the water-rock interaction makes the internal defects of mudstone gradually develop and form a fracture network structure,which eventually leads to the deterioration of its macroscopic mechanical *** porosity,fractal dimension and damage characteristics of mudstone show an exponential trend with the increase of water wetting ***,the deterioration mechanism of mudstone after water wetting are postulated to encompass factors such as the hydrophilicity of mineral molecular structures,hydration stress and expansion effects on clay particles,as well as the spatial distribution of microcracks and the phenomenon of fracture *** outcomes of this research endeavor aim to provide cer

关键词： Moisture absorption of mudstone Computed tomography scanning test Fracture structure evolution Macro-meso structural response Deterioration mechanism

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Analytical solution for tunnelling-induced response of an overlying pipeline considering gap formation

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Underground Space 2024年第2期15卷 298-311页

作者： Cungang Lin junjie zheng Yiwen Ye Farrokh Nadim Zhongqiang Liu Chenyang Zhao Yu Chen Zhi Ding Guangdong Research Center for Underground Space Exploitation Technology School of Civil EngineeringSun Yat-sen UniversityGuangzhou 510275China Guangdong Key Laboratory of Marine Civil Engineering School of Civil EngineeringSun Yat-sen UniversityGuangzhou 510275China State Key Laboratory for Tunnel Engineering Ministry of EducationGuangzhou 510275China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China School of Civil Engineering Wuhan UniversityWuhan 430072China Guangdong Road and Bridge Construction Development Co. Ltd.Guangzhou 510660China Norwegian Geotechnical Institute Oslo 0806Norway Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province Hangzhou 310015China

Soil-pipeline separation due to tunnelling has been certainly substantiated in previous model ***,this phenomenon has seldom been considered in current analytical *** study formulates a tensionless Winkler solution that could make allowance for gap formation in soil-pipeline interaction *** solution is validated by comparisons with existing experimental measurements and two recognized analytical ***,its advantage over an existing Winkler solution is *** parametric studies reveal that the effects of gap formation on the response of a pipeline rely largely on the tunnel volume loss and the pipeline’s bending stiffness and burial *** general,a pipeline’s bending moments and subgrade reaction forces are more susceptible than its deflections to the gap formation.

关键词： Soil-pipeline interaction Tunnelling Tensionless Winkler model Ground settlement Analytical solution Gap formation

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Critical Solvation Structures Arrested Active Molecules for Reversible Zn Electrochemistry

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Nano-Micro Letters 2024年第8期16卷 64-78页

作者： junjie zheng Bao Zhang Xin Chen Wenyu Hao Jia Yao Jingying Li Yi Gan Xiaofang Wang Xingtai Liu Ziang Wu Youwei Liu Lin Lv Li Tao Pei Liang Xiao Ji Hao Wang Houzhao Wan Hubei Yangtze Memory Laboratories Wuhan 430205People’s Republic of China Hubei Key Laboratory of Micro‑Nanoelectronic Materials and Devices School of MicroelectronicsHubei UniversityWuhan 430062People’s Republic of China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China Institute of Optoelectronics Technology China Jiliang UniversityHangzhou 310018People’s Republic of China

Aqueous Zn-ion batteries(AZIBs)have attracted increasing attention in next-generation energy storage systems due to their high safety and ***,the side reactions,dendrites and hydrogen evolution effects at the zinc anode interface in aqueous electrolytes seriously hinder the application of aqueous zinc-ion ***,we report a critical solvation strategy to achieve reversible zinc electrochemistry by introducing a small polar molecule acetonitrile to form a“catcher”to arrest active molecules(bound water molecules).The stable solvation structure of[Zn(H_(2)O)_(6)]^(2+)is capable of maintaining and completely inhibiting free water ***[Zn(H_(2)O)_(6)]^(2+)is partially desolvated in the Helmholtz outer layer,the separated active molecules will be arrested by the“catcher”formed by the strong hydrogen bond N-H bond,ensuring the stable desolvation of Zn^(2+).The Zn||Zn symmetric battery can stably cycle for 2250 h at 1 mAh cm^(-2),Zn||V_(6)O_(13) full battery achieved a capacity retention rate of 99.2%after 10,000 cycles at 10 A g^(-1).This paper proposes a novel critical solvation strategy that paves the route for the construction of high-performance AZIBs.

关键词： Zinc-ion battery Critical solvation Helmholtz layer Arrest active molecule Reversible zinc anode

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Aberrant Hippocampal Development in Early‑onset Mental Disorders and Promising Interventions:Evidence from a Translational Study

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Neuroscience Bulletin 2024年第6期40卷 683-694页

作者： Jingyu Yang Huiling Guo Aoling Cai junjie zheng Juan Liu Yao Xiao Sihua Ren Dandan Sun Jia Duan Tongtong Zhao Jingwei Tang Xizhe Zhang Rongxin Zhu Jie Wang Fei Wang Early Intervention Unit Department of PsychiatryAffiliated Nanjing Brain HospitalNanjing Medical UniversityNanjing 210029China School of Biomedical Engineering and Informatics NanjingMedical UniversityNanjing 211166China The Affiliated Changzhou Second People’s Hospital of Nanjing Medical University Changzhou Second People’s HospitalChangzhou Medical CenterNanjing Medical UniversityChangzhou 213004China Department of Radiology First Hospital of China Medical UniversityShenyang 110002China Department of Cardiac Function The People’s Hospital of China Medical University and the People’s Hospital of Liaoning ProvinceShenyang 110067China Key Laboratory of Magnetic Resonance in Biological Systems State Key Laboratory of Magnetic Resonance and Atomic and Molecular PhysicsNational Center for Magnetic Resonance in WuhanWuhan Institute of Physics and MathematicsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of Sciences-Wuhan National Laboratory for OptoelectronicsWuhan 430064China Institute of Neuroscience and Brain Diseases Xiangyang Central HospitalAffiliated Hospital of Hubei University of Arts and ScienceXiangyang 441021China Functional Brain Imaging Institute of Nanjing Medical University Nanjing 210029China

Early-onset mental disorders are associated with disrupted neurodevelopmental processes during *** methylazoxymethanol acetate(MAM)animal model,in which disruption in neurodevelopmental processes is induced,mimics the abnormal neurodevelopment associated with early-onset mental disorders from an etiological *** conducted longitudinal structural magnetic resonance imaging(MRI)scans during childhood,adolescence,and adulthood in MAM rats to identify specific brain regions and critical windows for ***,the effect of repetitive transcranial magnetic stimulation(rTMS)intervention on the target brain region during the critical window was *** addition,the efficacy of this intervention paradigm was tested in a group of adolescent patients with early-onset mental disorders(diagnosed with major depressive disorder or bipolar disorder)to evaluate its clinical translational *** results demonstrated that,compared to the control group,the MAM rats exhibited significantly lower striatal volume from childhood to adulthood(all P0.05)but was significantly lower than the control group from adolescence to adulthood(both P0.05).In the clinical trial,adolescents with early-onset mental disorders showed a significant increase in hippocampal volume after rTMS treatment compared to baseline(P<0.01),and these volumetric changes were associated with improvement in depressive symptoms(r=−0.524,P=0.018).These findings highlight the potential of targeting aberrant hippocampal development during adolescence as a viable intervent

关键词： Early-onset Mental disorder Neurodevelopment Animal model Hippocampus Repetitive transcranial magnetic stimulation

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Morphological,phylogenetic and metabolite profile of Prorocentrum clipeus,a newly recorded epiphytic dinoflagellate in the northern Yellow Sea

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Acta Oceanologica Sinica 2024年第8期43卷 128-141页

作者： Ruifang Wang Mengmeng Tong Shiwen Zhou junjie zheng Wenguang Zhang Xinfeng Dai Douding Lu Jiarong Hu Tianze Leng Qinglin Mu Zhongyong Yan Jiangning Zeng Pengbin Wang Ocean College Zhejiang UniversityZhoushan 316021China Key Laboratory of Marine Ecosystem Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China The State Key Laboratory of Marine Pollution Department of Biomedical SciencesCity University of Hong KongHong Kong SAR 999077China Zhejiang Marine Ecology and Environment Monitoring Center Zhoushan 316000China

More than 30 species of benthic Prorocentrum have been identified,some of which produce okadaic acid(OA)and its derivatives,dinophysistoxins(DTXs),which cause diarrhetic shellfish poisoning(DSP).Increasing numbers of benthic Prorocentrum species have been reported in tropical and subtropical waters of *** contrast,only a few benthic Prorocentrum species have been reported in temperate *** this study,morphological descriptions obtained using light microscopy,scanning electron microscopy and molecular characterization of one Prorocentrum clipeus strain isolated from the Yellow Sea are *** clipeus cells were nearly circular in shape,with a collar,ridge,and one *** periflagellar area was wide U-shaped,with two curved projections on platelet *** periflagellar platelets of different sizes were *** morphology closely fits that of the species isolated from other *** analysis based on the molecular sequences of the small subunit(SSU)rDNA,internal transcribed spacer(ITS),and large subunit(LSU)rDNA was performed.A comprehensive metabolomic analysis incorporating target,suspect and non-target screenings was first applied to investigate the intracellular and extracellular metabolite profiles of the current isolate of *** to the results of the target and suspect screenings,179 metabolites or toxins produced by DSP-related algal species,including OA,dinophysistoxin-1(DTX1),dinophysistoxin-2(DTX2)and pectenotoxin-2(PTX2),were not ***-target screening involving feature-based molecular networking(FBMN)provided a global view of major metabolites produced by the *** DF128 strain and revealed 23 clusters belonging to at least 13 compound classes,with organometallic compounds,lipids and lipid-like molecules,phenylpropanoids and polyketides,and benzenoids as major *** date,this is the first record of the characterization of *** in samples from Chinese *** results suppo

关键词： Prorocentrum taxonomy phylogeny metabolite profiling Yellow Sea

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基于改进三阶段法的隧道下穿建筑风险评估

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土木与环境工程学报（中英文） 2024年第4期46卷 91-99页

作者：郭逸凡郑俊杰刘辉华中科技大学土木与水利工程学院武汉430074

对地铁隧道施工可能引起的沿线建筑损伤进行风险评估具有重要意义,如何兼顾效率和准确性是隧道下穿建筑风险评估中的一个难题。提出一种改进的三阶段建筑损伤评估方法,在前两个阶段同时从隧道开挖对建筑的危害性和建筑自身的易损性两个... 详细信息

对地铁隧道施工可能引起的沿线建筑损伤进行风险评估具有重要意义,如何兼顾效率和准确性是隧道下穿建筑风险评估中的一个难题。提出一种改进的三阶段建筑损伤评估方法,在前两个阶段同时从隧道开挖对建筑的危害性和建筑自身的易损性两个角度对隧道下穿建筑的风险进行初筛,在第3阶段对隧道下穿建筑的风险进行多指标详细评估。在风险初筛中,用Peck经验公式和极限拉应变法评估隧道开挖对建筑的危害性,将建筑完损程度和建筑物理特征作为建筑易损性评估的依据。在建筑损伤风险详细评估中建立三维有限元数值模型,并选取多个控制指标综合评估隧道下穿引起的建筑损伤风险。以某盾构隧道下穿砌体建筑工程为例,应用改进三阶段法验证所提方法的合理性,结果表明引入易损性评估作为风险初筛的另一依据可以有效避免低估风险。对比评估结果与实测结果的可知,改进三阶段法能较为准确地评估隧道下穿建筑的风险。

关键词：改进三阶段法隧道下穿建筑建筑损伤易损性风险评估

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25-羟基维生素D_3替代维生素D_3对产蛋后期蛋鸡生产性能、蛋品质和钙磷代谢的影响

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动物营养学报 2024年第5期36卷 2992-3002页

作者：高珊郑君杰邱凯张海军武书庚中国农业科学院饲料研究所农业农村部饲料生物技术重点实验室农业农村部动物产品质量安全饲料源性因子风险评估实验室北京100081 北京市农产品质量安全中心北京100020

本试验旨在研究饲粮中添加25-羟基维生素D_(3)(25-OHD_(3))替代维生素D_(3)(VD_(3))对产蛋后期蛋鸡生产性能、蛋品质、钙磷代谢、肠道形态及胫骨质量的影响。试验选取270只55周龄采食正常、体重相近(整齐度>90%)的海兰褐蛋鸡,随机分为3... 详细信息

本试验旨在研究饲粮中添加25-羟基维生素D_(3)(25-OHD_(3))替代维生素D_(3)(VD_(3))对产蛋后期蛋鸡生产性能、蛋品质、钙磷代谢、肠道形态及胫骨质量的影响。试验选取270只55周龄采食正常、体重相近(整齐度>90%)的海兰褐蛋鸡,随机分为3个组,每组6个重复,每个重复15只鸡。对照组饲喂添加4000 IU/kg VD_(3)的基础饲粮,试验1组饲喂添加50μg/kg 25-OHD_(3)和2000 IU/kg VD_(3)的饲粮,试验2组饲喂添加100μg/kg 25-OHD_(3)的饲粮。预试期1周,正试期12周。结果表明:1)与对照组相比,试验1组第5~8周产蛋率显著提高(P<0.05),试验1组和试验2组第9~12周产蛋率显著提高(P<0.05)。2)与对照组相比,试验1组和试验2组第4周和第12周以及试验1组第8周蛋壳强度显著提高(P<0.05);试验1组第8周和试验2组第12周蛋白高度显著提高(P<0.05);试验1组和试验2组试验各阶段哈氏单位均显著提高(P<0.05)。3)与对照组相比,试验1组和试验2组血清钙和磷含量以及胫骨钙含量均显著提高(P<0.05)。4)与对照组相比,试验1组和试验2组血清超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)和过氧化氢酶(CAT)活性以及清除超氧阴离子能力和清除羟自由基能力显著提高(P<0.05),血清丙二醛(MDA)含量显著降低(P<0.05);试验1组血清总抗氧化能力(T-AOC)显著提高(P<0.05)。与对照组相比,试验1组血清碳酸酐酶(CA)和甲状旁腺素(PTH)含量显著提高(P<0.05),血清二胺氧化酶(DAO)含量显著降低(P<0.05);试验1组和试验2组血清骨钙素(BGP)含量显著降低(P<0.05);试验2组血清降钙素(CT)含量显著降低(P<0.05)。5)与对照组相比,试验1组空肠绒毛高度显著提高(P<0.05),试验2组空肠隐窝深度显著降低(P<0.05),试验1组和试验2组空肠绒毛高度/隐窝深度值均显著提高(P<0.05)。6)与对照组相比,试验2组胫骨强度、骨小梁数量、骨小梁面积显著提高(P<0.05),试验1组胫骨粗灰分含量显著提高(P<0.05)。综上所述,与饲粮中仅添加VD_(3)相比,饲粮中添加25-OHD_(3)可提高产蛋后期蛋鸡生产性能和蛋品质,增强抗氧化能力,维持肠道形态,促进血清和胫骨钙和磷的吸收和沉积,改善胫骨质量。

关键词： 25-羟基维生素D_3 产蛋后期蛋鸡生产性能蛋品质钙磷代谢胫骨质量

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UPLC/MS-MS结合QuEChERs检测可食性鸡组织中8-α-羟基妙林残留

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中国家禽 2024年第3期46卷 65-70页

作者：李文辉倪香艳郑君杰北京市农产品质量安全中心北京102629

为准确测定可食性鸡组织中8-α-羟基妙林的残留量,试验建立了一种高效液相色谱-串联质谱(UPLC/MS-MS)结合QuEChERs的快速检测方法。样品经酸化丙酮提取,Bond Elut QuEChERs柱净化,氢氧化钠碱溶液水解,乙酸乙酯反萃取,高效液相色谱-串联... 详细信息

为准确测定可食性鸡组织中8-α-羟基妙林的残留量,试验建立了一种高效液相色谱-串联质谱(UPLC/MS-MS)结合QuEChERs的快速检测方法。样品经酸化丙酮提取,Bond Elut QuEChERs柱净化,氢氧化钠碱溶液水解,乙酸乙酯反萃取,高效液相色谱-串联质谱仪测定。结果显示:鸡肉和鸡肝中8-α-羟基妙林在50~200μg/kg浓度范围内,方法具有良好的线性相关性,相关系数≥0.99;在可食性鸡组织中的检出限为10~20μg/kg,定量限为25~50μg/kg;8-α-羟基妙林在50、100和200μg/kg添加水平下平均回收率为65.07%~103.16%,批内、批间变异系数均≤20%。研究提示:建立的方法操作简便、结果准确,满足了兽药残留药物痕量检测方法规定要求,适用于可食性鸡组织中8-α-羟基妙林的残留量测定。

关键词： 8-α-羟基妙林超高效液相色谱-串联质谱鸡组织残留

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