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Dynamic impact properties of deep sandstone under thermal-hydraulicmechanical coupling loads

Journal of Mountain Science 2024年第6期21卷 2113-2129页

作者： CAO Chunhui ding haonan ZOU Baoping School of Civil Engineering and Architecture Zhejiang University of Science and TechnologyHangzhou 310023China Zhejiang-Singapore Joint Laboratory for Urban Renewal and Future City Hangzhou 310023China

The deep rock mass within coal mines situated in a challenging environment are characterized by high ground stress,high geotemperature,high osmotic water pressure,and dynamic disturbances from mechanical *** investigate the impact of this complex mechanical environment on the dynamic characteristics of roof sandstone in self-formed roadways without coal pillars,standard specimens of deep sandstone from the 2611 upper tunnel working face of the Yongmei Company within the Henan Coal Chemical Industry Group in Henan,China were prepared,and an orthogonal test was *** a self-developed geotechnical dynamic impact mechanics test system,triaxial dynamic impact tests under thermal-hydraulicmechanical coupling conditions were conducted on deep *** results indicate that under high confining pressure,deep sandstone exhibits pronounced brittle failure at low temperatures,with peak strength gradually decreasing as temperature and osmotic water pressure ***,under low confining pressure and low temperature,the brittleness of deep sandstone weakens gradually,while ductility ***,sandstone demonstrates higher peak strength at low temperatures under high axial pressure conditions,lower peak strength at high temperatures,and greater strain under low axial pressure and high osmotic water *** in impact air pressure and osmotic water pressure have proportionally greater effects on peak stress and peak *** 50%of the input strain energy is utilized as effective energy driving the sandstone fracture *** analysis identifies the optimal combination of factors affecting the peak stress and peak strain of *** the coupling effect,intergranular and transgranular fractures occur within the *** images illustrate that the damage forms range from minor damage with multiple fissures to extensive fractures and severe *** study elucidates the varied dynamic impact me

关键词： Deep sandstone Thermal-hydraulicmechanical coupling Dynamic impact Stress-strain Failure Modes Polar analysis

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Analysis of Roadbed Pavement Designs for Highway Reconstruction and Upgrading

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Journal of Architectural Research and Development 2024年第3期8卷 93-97页

作者： haonan ding Zhipan Yang Wei Gan China Merchants Chongqing Communications Technology Research&Design Institute Co. LTD.Chongqing 400067China

This paper focuses on the route and roadbed pavement design in highway reconstruction and upgrading *** discusses the importance of project design for highway reconstruction and upgrading,highlighting key aspects of route design and roadbed pavement *** analysis reveals that the main design considerations in these projects include controlling factors of route reconstruction,expansion,and upgrading,as well as route plan design and longitudinal section design combined with roadbed *** roadbed pavement design,it is crucial for designers to thoroughly collect existing data and make reasonable use of the current roadbed and pavement to develop a comprehensive design *** analysis aims to provide a reference for the reasonable design of such projects.

关键词： Highway engineering Reconstruction and upgrading design Route design Roadbed and pavement design

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Design Method for Road Reconstruction and Expansion

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Journal of Architectural Research and Development 2024年第2期8卷 31-36页

作者： Wei Gan haonan ding Zhipang Yang China Merchants Chongqing Communications Technology Research&Design Institute Co. Ltd.Chongqing 400067China

This article analyzes the method for designing routes in road reconstruction and expansion projects,using an actual engineering project as an *** includes an overview of a specific road reconstruction and expansion project,an analysis of the preexisting road,the basic principles of the design road project,and an analysis of the design methods and *** study aims to offer some guidance for road reconstruction and expansion design.

关键词： Road engineering Reconstruction and expansion Line design Design principles

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Settlement Control Standards of Construction and Expansion for Mountainous Highway Roadbeds

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Journal of Architectural Research and Development 2024年第2期8卷 43-49页

作者： Zhipan Yang Wei Gan haonan ding China Merchants Chongqing Communications Technology Research&Design Institute Co. Ltd.Chongqing 400067China

This article analyzes the differential settlement of new and old roadbeds after widening and its characteristics based on a highway reconstruction and expansion project case *** research proposes a subgrade settlement control standard that states that the maximum differential settlement value should be less than 5 cm when the embankment fill height exceeds 20 ***,the maximum differential settlement value should be less than 10 cm when the embankment fill height does not exceed 20 *** findings of the study can provide a useful reference for the design of roadbed widening in highway reconstruction and expansion projects.

关键词： Mountainous highway Reconstruction and expansion Roadbed widening Settlement control

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高桥隧比条件下桥隧相连的隧道洞口联络道设计探讨——以重庆巫溪至陕西镇坪高速公路为例

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公路交通技术 2024年第3期40卷 118-123页

作者：杨勇祝建平丁皓南招商局重庆交通科研设计院有限公司重庆400067

为确定高桥隧比条件下高速公路桥隧相连的特长隧道洞口联络道的转换长度和结构形式,采用数值模拟方法,选用18.1 m的长头铰接列车为典型车辆,针对10 m~30 m五种左右幅间距及0°~45°四种行驶转换角度,模拟车辆行驶轨迹并计算联络道通行... 详细信息

为确定高桥隧比条件下高速公路桥隧相连的特长隧道洞口联络道的转换长度和结构形式,采用数值模拟方法,选用18.1 m的长头铰接列车为典型车辆,针对10 m~30 m五种左右幅间距及0°~45°四种行驶转换角度,模拟车辆行驶轨迹并计算联络道通行的最小长度。结果表明:1)在满足转换车道基本长度的前提下,模拟隧道洞口联络道推荐长度采用30 m或40 m;2)基于模拟结果推荐的联络道长度,为超高桥隧比的巫镇高速隧道洞口联络道设计提供了重要的基础依据;3)在运营期间,该高速的洞口联络道实现了养护维修或异常工况下的交通转换,有效提升了道路防灾减灾和运营养护能力,为类似工程的设计提供了有益参考。

关键词：道路工程高桥隧比隧道洞口联络道

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Dynamic Mechanical Behavior and Numerical Simulation of an Ancient Underground Rock Mass under Impact Loading

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Computer Modeling in Engineering & Sciences 2023年第1期134卷 517-539页

作者： Baoping Zou Zhiping Liu Weifeng Jin haonan ding Zhanyou Luo School of Civil Engineering and Architecture Zhejiang University of Science and TechnologyHangzhou310023China

To study the dynamic mechanical properties of tuff under different environmental conditions,the tuff from an ancient quarry in Shepan Island was *** impact damage to the rock was tested using a triaxial dynamic impact mechanical testing system(TDIMTS)with different ground stresses,temperatures,and groundwater *** time-strain relationship,dynamic stress-strain relationship,energy dissipation law,energy-peak strain relationship,and the impact damage pattern of the tuff specimens under impact air pressures were *** TDIMTS experiment on ancient underground rock mass under impact loading was also simulated using the finite element analysis software LS-DYNA based on the Holmquist-Johnson-Cook(HJC)material *** dynamic failure process,failure pattern and peak stress of tuff specimen were *** simulation results obtained using the above methods were in good agreement with the experimental *** results of the dynamic experiment show that with the same local stress,groundwater pressure,and temperature,the damage to the tuff specimens caused by blasting and quarrying disturbances gradually increases as the impact pressure *** the same local stress,groundwater pressure,and temperature,the energy required to rupture the tuffs in ancient underground caverns is relatively small if the impact pressure is low accordingly,but as the impact pressure increases,the damage to the tuff caused by quarrying disturbance gradually *** damage gradually increases and the degree of damage to the tuff and the strain energy exhibit asymptotic growth when the tuff specimens are subjected to the greater strain energy,increasing the degree of rupturing of the *** addition,the average crushing size decreases with increasing strain *** comparing the simulation results with the experimental results,it was found that the HJC model reflected the dynamic impact performance of tuff specimen,and the simulation results showe

关键词： Ancient underground caverns numerical simulation thermal-hydraulic-mechanical coupling dynamic impact tuff stability of surrounding rock

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利用阻控技术的水稻镉、砷安全种植研究

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浙江农业科学 2024年第1期65卷 41-46页

作者：蓝淯琛丁浩男潘荣庆吕浩能张强班国富何烨凌华荣黄智刚广西大学广西南宁530004

为研究叶面施用有机硒、有机硅阻控剂对不同水稻品种富集重金属的影响,通过田间试验,在重金属污染严重地区开展筛选重金属低积累水稻品种和叶面阻控技术的研究,使水稻籽粒的重金属含量降低,从而达到粮食安全生产标准的要求。本研究选用... 详细信息

为研究叶面施用有机硒、有机硅阻控剂对不同水稻品种富集重金属的影响,通过田间试验,在重金属污染严重地区开展筛选重金属低积累水稻品种和叶面阻控技术的研究,使水稻籽粒的重金属含量降低,从而达到粮食安全生产标准的要求。本研究选用6个广西当地主栽的晚稻品种,和市面上2种叶面阻控剂(一种硒类阻控剂,一种硅类阻控剂)作为研究对象,通过测定试验前后稻米样品中的重金属含量来开展对重金属污染土壤的安全利用技术研究。结果显示,6个水稻品种对重金属的吸附能力存在较大差异,其中,泰丰优208茎、叶的镉、砷含量均高于其他品种,泰丰优208稻米的镉含量最低,丝香1号稻米的砷含量最低。叶面施用硒类阻控剂、硅类阻控剂均可以有效降低稻米的镉含量,较CK分别下降了15.2%、17.1%;在叶面施用硒类阻控剂、硅类阻控剂也可以有效降低叶的镉含量及稻米的砷含量,叶的镉含量分别下降了12.7%、13.9%,稻米砷含量分别下降了15.9%、30.0%,同时硅类阻控剂还可以有效降低水稻叶砷含量。研究表明,施用硒类阻控剂、硅类阻控剂均可以减少砷、镉在稻米中的含量。

关键词：晚稻品种叶面阻控剂安全利用重金属

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二级再生循环水网络优化

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大连理工大学学报 2019年第3期59卷 239-243页

作者：丁皓楠冯霄西安交通大学化学工程与技术学院陕西西安710049

再生循环水网络是水系统集成技术的重要组成部分,能最大程度地减少新鲜水消耗和废水排放.多级再生循环水网络能够在保证新鲜水消耗量不变的同时降低再生成本.针对具有二级再生循环的单杂质水网络,建立了相关的数学模型,通过求解数学模... 详细信息

再生循环水网络是水系统集成技术的重要组成部分,能最大程度地减少新鲜水消耗和废水排放.多级再生循环水网络能够在保证新鲜水消耗量不变的同时降低再生成本.针对具有二级再生循环的单杂质水网络,建立了相关的数学模型,通过求解数学模型依次确定水网络的最小新鲜水流率、最小一级再生水流率、最小二级再生水流率和最优再生浓度.通过数学规划法快速而准确地确定了二级再生循环水网络的关键参量并构建了水网络结构.提出的方法和思路能够延伸至具有多级再生循环的水网络.

关键词：二级再生再生循环水网络数学规划法

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碟式太阳能光热发电跟踪控制系统的研究

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电子测量与仪器学报 2019年第4期31卷 202-209页

作者：丁浩楠李晓中北大学电气与控制工程学院太原030051 中北大学施耐德电气联合实验室太原030051

碟式太阳能光热发电跟踪控制系统的关键技术在于使太阳光线始终垂直照射在碟式聚光器上,提高太阳能的利用率。碟式聚光器跟踪月球的目的是测月光的聚光光斑的相对能流密度分布,乘以太阳直射辐射(DNI),得到太阳的聚光光斑的能流密度分布... 详细信息

碟式太阳能光热发电跟踪控制系统的关键技术在于使太阳光线始终垂直照射在碟式聚光器上,提高太阳能的利用率。碟式聚光器跟踪月球的目的是测月光的聚光光斑的相对能流密度分布,乘以太阳直射辐射(DNI),得到太阳的聚光光斑的能流密度分布。采用天文算法计算出太阳和月球的高度角和方位角,得到高精度的太阳和月球位置。该实验平台突破了传统的控制方式,利用全新的上位机软件***来控制碟式聚光器的俯仰和水平驱动机构跟踪太阳和月球的高度角和方位角,跟踪方式为双轴跟踪模式,系统的跟踪精度可达0. 001 rad,与以往的控制系统相比,跟踪精度提高了1倍左右。

关键词：碟式太阳能太阳位置水平驱动机构俯仰驱动机构

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Extracellular Disintegration of Viral Proteins as an Innovative Strategy for Developing Broad-Spectrum Antivirals Against Coronavirus

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CCS Chemistry 2024年第2期6卷 487-496页

作者： Ke Sun Zhe ding Xiaoying Jia haonan Cheng Yingwen Li Yan Wu Zhuoyu Li Xiaohua Huang Fangxu Pu Entao Li Guiyou Wang Wei Wang Yun ding Gary Wong Sandra Chiu Jiaming Lan Aiguo Hu Shanghai Key Laboratory of Advanced Polymeric Materials School of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237 CAS Key Laboratory of Molecular Virology&Immunology Chinese Academy of SciencesShanghai 200031 University of the Chinese Academy of Sciences Beijing 100049 State Key Laboratory of Virology Center for Biosafety Mega-ScienceWuhan Institute of VirologyChinese Academy of SciencesWuhan 430071 Division of Life Sciences and Medicine University of Science and Technology of ChinaHefeiAnhui 230027 Department of Clinical Laboratory The First Affiliated Hospital of USTCDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefeiAnhui 230001

The coronavirus disease 2019(COVID-19)pandemic,caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2),has claimedmillions of lives and caused innumerable economic losses ***,state-of-the-art treatments still lag behind the continual emergence of new *** to resolving this issue is developing antivirals to deactivate coronaviruses regardless of their structural ***,we report an innovative antiviral strategy involving extracellular disintegration of viral proteins with hyperanion-grafted enediyne(EDY)*** core EDY generates reactive radical species and causes significant damage to the spike protein of coronavirus,while the hyperanion groups ensure negligible cytotoxicity of the *** EDYs exhibit antiviral activity down to nanomolar concentrations,and the selectivity index of up to 20,000 against four kinds of human coronavirus,including the SARS-CoV-2 Omicron variant,suggesting the high potential of this new strategy in combating the COVID-19 pandemic and a future“disease X.”

关键词： enediyne broad spectrum antiviral protein disintegration coronavirus polyanions

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