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Structural design and mechanical responses of closely spaced super-span double tunnels in strongly weathered tuff strata

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Frontiers of Structural and Civil Engineering 2022年第6期16卷 685-703页

作者： jiaxin he Shaohui he Xiabing LIU Jinlei ZheNG School of Civil Engineering Beijing Jiaotong UniversityBeijing 100044China

This paper presents a study of closely spaced double tunnels in Taizhou,*** is Xiabei Mountain No.2 four-line super-span high-speed railway tunnel(HRT),and the other is Xiabei Mountain double-line large-span subway tunnel(ST).The excavation spans of HRT and ST are 26.3 and 14 m,*** two tunnels are located at different levels,and their separating distance is 17.2 *** to the short construction period,the HRT excavation was completed earlier than *** structural design of the HRT,taking account of the disturbance by the ST construction,was analyzed by a numerical *** was found that the“yielding principle”design was more feasible than the“resistance principle”design when considering the safety and durability of the HRT secondary *** mechanical responses of the HRT during ST construction were comprehensively monitored and analyzed,including the vault settlement,horizontal convergence,surrounding rock pressure,and the internal stress in shotcrete and steel *** show that the longitudinal influence range of the ST construction on the HRT was approximately 0.6–1.1 times the ST outer diameter;the disturbance was mainly generated in the ST upper bench excavation;and the final axial force of the HRT shotcrete was approximately 9–16 times that of the steel arch,which indicated that the shotcrete was the main bearing *** safety status of the HRT was assessed based on the monitoring data,and the minimum safety factors of the HRT shotcrete and steel arch were 1.61 and 1.89,*** studies were performed to show how the lining stress of HRT was affected by the relative angle,pillar width,ST excavation method and excavation ***,the design and construction optimization were proposed according to the monitoring data and parameter analysis *** study might provide practical reference for similar projects.

关键词： double tunnels super-span structural design mechanical response numerical simulation field monitoring

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Spatial-temporal Evolution of the Urban-rural Coordination Relationship in Northeast China in 1990-2018

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Chinese Geographical Science 2021年第3期31卷 429-443页

作者： WANG Ying CheN Xiaohong SUN Pingjun LIU Hang he jiaxin College of Geographical Sciences Harbin Normal UniversityHarbin 150025China College of Geographical Sciences Southwest UniversityChongqing 400700China

To comprehensively understand the law of urban-rural relationship and propose scientific measures of urban-rural coordinated development in Northeast China,this study uses the coupling coordination degree model and geographically and temporally weighted regression(GTWR)model to analyze the spatial-temporal patterns and the corresponding driving mechanisms of its urban-rural coordination since *** results are as ***,the urban-rural coupling coordination degree in Northeast China was very low and improved slowly,but its stages of evolution is a good interpretation of the strategic arrangements of China's ***,the urban-rural coupling coordination degree in Northeast China had spatial differences and was characterized by central polarization,converging on urban agglomeration,which was high in the south and low in the ***,the gap between the north and south ***,the spatial-temporal evolution of the urban-rural coordination relationship in Northeast China was influenced by pulling from the central cities,pushing from rural transformation,and government *** influence intensity of the three mechanisms was weak,but the pulling from the central cities was stronger than that of the other two ***,the spatial difference between the three mechanisms determines the spatial pattern and its evolution of the urban-rural coordination relationship in Northeast ***,to promote the development of urban-rural coordination in Northeast China,it is essential to advance urban-rural economic correlation,enhance the government^role in regulating and guiding,and adopt different policies for each region in Northeast China.

关键词： urban-rural coordination relationship spatial-temporal evolution coupling coordination degree model geographically and temporally weighted regression(GTWR) Northeast China

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A low-cost and high-strength basalt/carbon fiber reinforced polymer improved by imitating tree-root micro/nano aramid short fiber

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Chinese Journal of Aeronautics 2024年第10期37卷 526-538页

作者： Guangming YANG Yanan LYU Fei CheNG jiaxin he Shihao ZUO Wenyi HUANG Yunsen HU Xiaozhi HU Xi CheN Shock and Vibration of Engineering Materials and Structures Key Lab of Sichuan Province Southwest University of Science and TechnologyMianyang 621010China Engineering Research Center of Biomass Materials Ministry of EducationSouthwest University of Science and TechnologyMianyang 621010China School of Materials and Chemistry Southwest University of Science and TechnologyMianyang 621010China Institute of Automation Chinese Academy of SciencesBeijing 100190China School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100101China School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Department of Mechanical Engineering University of Western AustraliaPerth 6009Australia

The high-strength Basalt Carbon Fiber Reinforced Polymer(BCFRP)composites had been manufactured by guiding Imitating Tree-root Micro/Nano Aramid Short Fiber(ITMNASF)into the interlayer of Basalt Fiber(BF)and Carbon Fiber(CF)plies to form thin interleaving,and various mass proportions of IT-MNASF were designed to discuss the reinforcing effect on the BCFRP heterogeneous *** results of three points bending tests showed that flexural strength and energy absorption of 4wt%IT-MNASF reinforced BCFRP heterogeneous composites had been improved by 32.4%and 134.4%respectively compared with that of unreinforced *** 4wt%IT-MNASF reinforced BCFRP specimens showed both a greater strength and a lower cost(reduced by 31%around)than that of plain CFRP composites.X-ray micro-computed tomography scanning results exhibited that the delamination-dominated failure of plain BCFRP composites was changed into multi-layer BF and CF fabrics *** reinforcing mechanism revealed that the introduced IT-MNASF could construct quasi-vertical fiber bridging,and it was used as"mechanical claws"to grasp adjacent fiber layers for creating a stronger mechanical interlocking,and this effectively improved resin-rich region and interfacial transition region at the *** simple and effective IT-MNASF interleaving technique was very successful in low-cost and high-strength development of BCFRP heterogeneous composites.

关键词： Basalt carbon fiber reinforced polymer Micro/nano aramid fiber Fiber bridging Strength improvement Low-cost substitution

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Constructing flexible fiber bridging claws of micro/nano short aramid fiber at interlayer of basalt fiber reinforced polymer for improving compressive strength with and without impact

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Chinese Journal of Aeronautics 2024年第12期37卷 484-497页

作者： jiaxin he Yanan LYU Guangming YANG Fei CheNG Yongjun DENG Shihao ZUO Sidra ASHFAQ Yunsen HU Xiaozhi HU Shock and Vibration of Engineering Materials and Structures Key Lab of Sichuan Province Southwest University of Science and TechnologyMianyang 621010China School of Materials and Chemistry Southwest University of Science and TechnologyMianyang 621010China Sichuan Sizhong Basalt Fiber Technology Research Co. Ltd.Dazhou 635756China Basalt Fiber and Composite Key Laboratory of Sichuan Province Dazhou 635756China Institute of Automation Chinese Academy of SciencesBeijing 100190China School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China School of Mechanical Engineering University of Western AustraliaPerth 6009Australia

The high-performance Basalt Fiber Reinforced Polymer(BFRP)composites have been prepared by guiding Micro/Nano Short Aramid Fiber(MNSAF)into the interlayer to improve the resin-rich region and the interfacial transition region,and the flexible fiber bridging claws of MNSAF were constructed to grasp the adjacent layers for stronger interlaminar *** lowvelocity impact results show that the MNSAF could improve the impact resistance of BFRP *** compression test results demonstrate that the compressive strength and the residual compressive strength after impact of MNSAF-reinforced BFRP composites were greater than those of unreinforced one,exhibiting the greatest 56.2% and 73.3% increments respectively for BFRP composites improved by 4wt%MNSAF.X-ray micro-computed tomography scanning results indicate that the“fiber bridging claws”contributed to better mechanical interlocking to inhibit the crack generation and propagation under impact and compression load,and the original delamination-dominated failure of unreinforced BFRP composites was altered into sheardominated failure of MNSAF-reinforced BFRP ***,the MNSAF interleaving might be an effective method in manufacturing high-performance laminated fiber in industrial production.

关键词： Basalt fiber reinforced polymer Micro/nano short aramid fiber Flexible fiber bridging claws Compressive strength after impact Mechanical interlocking

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The governance of imported 2019-nCov infections:What can be learned from China’s experience?

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Global health Research and Policy 2022年第1期7卷 517-523页

作者： Hao Li jiaxin he Jiayu Chen Shuning Pan Jiehan Feng Shuang Liu Global health Institute/School of Public health Wuhan UniversityWuhanChina School of Law Henan UniversityKaifengChina Shenzhen health Development Research and Data Management Center ShenzhenChina Institute of International Law Wuhan UniversityWuhanChina Law School Tianjin UniversityNo.92Weijin RoadNankai DistrictTianjin 300072China

Delta and Omicron variants of 2019-nCoV are still spreading globally,and many imported infections have been identified in China as *** order to control the spread chain from imported to local,China has implemented the dynamic Covid-zero *** this article we summarized China’s governance models and practices of fighting potential imported infections in two *** targets at international travelers,which can be outlined as four lines of defense:customs epidemic prevention,quarantine upon arrival,relevant laws and regulations,and community *** other is against other vectors potentially carrying 2019-nCoV,which can be outlined by three lines of defense:customs epidemic prevention,disinfection and personal protection,and information ***,there are still some challenges that are yet to be addressed,such as illegal immigration,accidental occupational exposure to 2019-nCoV,***’s experience indicates that no country can stay safe during the global pandemic as long as there are local outbreaks in other countries,and active prevention and control measures based on science and a complete set of laws and regulations are still necessary at current ***’s more,accountable government commitment and leadership,strengthened health and social governance systems,and whole society participation are *** is suggested that the global community continue to closely cooperate together and take active rather than passive actions to block the potential imported 2019-nCoV from causing local spreading.

关键词： 2019-nCoV COVID-19 Imported infection Policy implication China

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高吸附铅乳酸菌的微胶囊化及特性

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中国食品学报 2021年第3期21卷 173-182页

作者：董阳贺佳鑫顾悦贺银凤内蒙古农业大学食品科学与工程学院呼和浩特010018

乳酸菌作为人体重要的微生物之一,在肠道内发挥益生作用,然而,其不良的环境耐受能力,使其生长、定植受到影响。研究乳酸菌的微胶囊化对提高其环境耐受性具有重要的意义。本研究选取具有高耐受和吸附铅能力的戊糖片球菌10-a-1为研究对象... 详细信息

乳酸菌作为人体重要的微生物之一,在肠道内发挥益生作用,然而,其不良的环境耐受能力,使其生长、定植受到影响。研究乳酸菌的微胶囊化对提高其环境耐受性具有重要的意义。本研究选取具有高耐受和吸附铅能力的戊糖片球菌10-a-1为研究对象,采用内源乳化法制备海藻酸钠微胶囊,并优化其工艺。通过单因素试验和正交试验确定最优工艺参数,在此基础上利用壳聚糖进行二次包埋,比较两种微胶囊的特性。结果表明:在海藻酸钠质量分数3%,水油质量比30∶120,酸钙质量比3∶1,转速600 r/min,钙胶质量比1.5∶9条件下的海藻酸钠微胶囊的包埋率最高,可达86.3%。海藻酸钠-壳聚糖微胶囊的包埋率为65.6%。对比两种微胶囊的特性,海藻酸钠微胶囊比海藻酸钠-壳聚糖微胶囊释放快;海藻酸钠-壳聚糖微胶囊耐胃肠液的效果好,存活率高;两种微胶囊均可增强模拟胃肠液处理中菌吸附铅的能力,且海藻酸钠-壳聚糖微胶囊对铅的吸附效果更好。在4°C和20°C条件下分别贮藏28 d,海藻酸钠-壳聚糖微胶囊中菌的存活率最高。微胶囊化技术可显著提高戊糖片球菌10-a-1对不良环境的耐受能力,并减小模拟胃肠液处理对戊糖片球菌10-a-1吸附铅能力的影响。

关键词：内源乳化法海藻酸钠微胶囊双层包埋铅吸附能力

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中华法系与中华法律文化关系考辨

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法学 2024年第10期 36-50页

作者：何佳馨上海财经大学法学院

中华法系渊源于夏商周三代即已萌芽的中华法律文化,成型于6世纪末7世纪初周边国家对中国法的吸收借鉴。中华法系既来源于中华法律文化,包括法律的指导思想、法律的制度设计、运作法律的律家群体等,又凝聚、提升了中华法律文化。中华法... 详细信息

中华法系渊源于夏商周三代即已萌芽的中华法律文化,成型于6世纪末7世纪初周边国家对中国法的吸收借鉴。中华法系既来源于中华法律文化,包括法律的指导思想、法律的制度设计、运作法律的律家群体等,又凝聚、提升了中华法律文化。中华法律文化经由中华法系得以被世界关注与接纳,并成为人类法律文明的重要组成部分,傲立于世界法律文明之林。

关键词：中华法系中华法律文化世界法律文明

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论贝卡里亚与近代酷刑和死刑的废除——兼评《论犯罪与刑罚》

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政治与法律 2006年第3期 142-148页

作者：何佳馨复旦大学法学院上海200433

《论犯罪与刑罚》的出版是贝卡里亚对于法国哲学、法国理性主义研究的结果,也意味着近代刑法学的诞生。这部著作反对秘密审判;反对强加给被告的誓言;反对将财产充公、无耻的刑罚。贝卡里亚认为,死刑是野蛮的一种表现。在意大利,酷刑的... 详细信息

《论犯罪与刑罚》的出版是贝卡里亚对于法国哲学、法国理性主义研究的结果,也意味着近代刑法学的诞生。这部著作反对秘密审判;反对强加给被告的誓言;反对将财产充公、无耻的刑罚。贝卡里亚认为,死刑是野蛮的一种表现。在意大利,酷刑的最坚决反对者是贝卡里亚。英国的刑法改革可以追溯到以贝卡里亚为代表人物的伏尔泰学派。在法国,早在1790年法国大革命之前,贝卡里亚的思想就被国家立法机构所采纳:除了政治犯罪外,其他罪刑都不适用死刑。在意大利,1889年的刑法典废除了死刑,在该刑法典制定前的很长一段时间里,死刑被减为终身监禁。死刑被保留在陆军和海军军法中。

关键词：贝卡里亚酷刑和死刑的废除启蒙运动近代刑法学

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新中国医疗保障立法70年——以分级诊疗的制度设计与进步为中心

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法学 2019年第10期 75-92页

作者：何佳馨上海财经大学法学院

今年是新中国成立70周年,经历了70年的艰辛努力,我们不仅在经济建设,法治建设,以及教育、科技等方面取得了巨大的成就,在医疗保障立法等领域也做出了许多探索,分级诊疗的法律制度设计和实践是其中的经典之一。本文围绕新中国成立70年来... 详细信息

今年是新中国成立70周年,经历了70年的艰辛努力,我们不仅在经济建设,法治建设,以及教育、科技等方面取得了巨大的成就,在医疗保障立法等领域也做出了许多探索,分级诊疗的法律制度设计和实践是其中的经典之一。本文围绕新中国成立70年来分级诊疗立法的进步,分三个层面,比较详细地回顾了这70年所走过的艰苦历程、取得的重要经验,对当下分级诊疗制度设计的内容和特点,所存在的问题及相应对策等进行了比较系统的阐述。强调分级诊疗的制度安排,是一个系统工程,需要多元化的法律规范和相应的配套措施,以及各级政府、医疗机构和广大患者的共同努力、持续推进,才有可能将其做好,在新一轮的医疗改革中发挥出正能量,为解决"看病难""看病贵"做出贡献。

关键词：医疗改革立法保障制度安排 70年社会保障法

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脆岩超大断面隧道双层初支支护时机研究

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岩石力学与工程学报 2023年第12期42卷 3010-3019页

作者：贺家新贺少辉刘夏冰麻建飞北京交通大学土木建筑工程学院北京100044 广东华路交通科技有限公司广州广东510420

通过改进现有的破坏接近度理论,建立脆性岩体力学状态的安全性评价指标(BRSI),实现对脆性岩体弹性状态、应变硬化状态、脆性破坏和残余状态的定量表达。基于脆性围岩力学状态与BRSI指标之间的定量关系,提出一种脆岩超大断面隧道分步施... 详细信息

通过改进现有的破坏接近度理论,建立脆性岩体力学状态的安全性评价指标(BRSI),实现对脆性岩体弹性状态、应变硬化状态、脆性破坏和残余状态的定量表达。基于脆性围岩力学状态与BRSI指标之间的定量关系,提出一种脆岩超大断面隧道分步施工中双层初支最佳支护时机的确定方法。通过三维数值模拟,将所提方法在下北山隧道工程中进行分析与验证。结果表明:(1)低围压状态下,凝灰岩达到极限强度后立即发生脆性破坏,随着围压的增加,凝灰岩表现出逐渐软化的特征;(2)隧道施工中,围岩BRSI值的发展经历初始发展、快速发展和逐步稳定3个阶段;(3)中导坑岩柱的开挖使洞壁围岩的应力状态和破坏模式发生转变,导致中导坑的最佳支护时机比边导坑滞后2~10 m;(4)BRSI指标能够准确、直观地表征脆性围岩的力学状态,所提支护时机确定方法合理、可靠。

关键词：隧道工程破坏接近度脆性岩体超大断面隧道分步开挖双层初支支护时机

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