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A novel tunnel waterproof-drainage system based on double-bonded waterproofing materials and its seepage characteristics

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Frontiers of Structural and Civil Engineering 2024年第9期18卷 1321-1336页

作者： xiaohe SUN Chenghua SHI guoqing xiao Yangyang GE Chengyong CAO School of Civil Engineering Central South UniversityChangsha 410075China PowerChina ZhongNan Engineering Corporation Limited Changsha 410014China State Key Laboratory of Special Functional Waterproof Materials Beijing Oriental Yuhong Waterproof Technology Co.Ltd.Beijing 101111China College of Civil and Transportation Engineering Shenzhen UniversityShenzhen 518060China

Double-bonded spray membrane waterproofing materials have excellent waterproofing performance and can improve the load-bearing capacity of tunnel linings,leading to an increasing global ***,due to the double-bonded capability of spray membrane materials,traditional interlayer drainage methods cannot be *** limitation makes it difficult to use them in drainage-type tunnels,significantly restricting their range of *** this regard,a novel tunnel waterproof-drainage system based on double-bonded spray membrane materials was proposed in this *** proposed drainage system primarily comprises upper drainage sheets and bottom drainage blind pipes,both located in the tunnel circumferential direction,as well as longitudinal drainage pipes within the ***,numerical calculation methods are employed to analyze the seepage characteristics of this system,revealing the water pressure distribution around the *** results indicate that in the novel waterproof-drainage system,the water pressure in the secondary lining exhibits a“mushroom-shaped”distribution in the circumferential direction,while the water pressure in the longitudinal direction exhibits a“wave-like”***,comparative results with other waterproof-drainage systems indicate that under typical working conditions with a water head of 160 m and a rock permeability coefficient of 10^(−6)m/s,the maximum water pressure in the secondary lining of the novel waterproof-drainage system is 0.6 *** represents a significant reduction compared to fully encapsulated waterproofing and traditional drainage systems,which respectively reduce the water pressure by 65%and 30%.The applicability analysis of the double-bonded waterproofing and drainage system reveals that it can reduce at least 40%of the static water pressure in any groundwater *** novel drainage system provides a valuable reference for the application of double-bonded spray membr

关键词： tunnel drainage spray-applied waterproofing membrane numerical simulation water pressure

Conceptual design of the HIRFL-CSR external-target experiment

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Science China(Physics,Mechanics & Astronomy) 2017年第1期60卷 65-71页

作者： LiMing Lu Hart Yi ZhiGang xiao Ming Shao Song Zhang guoqing xiao Nu Xu Department of Physics Tsinghua University Beijing 100084 China Collaborative Innovation Center of Quantum Matter Beijing 100084 China Department of Modern Physics University of Science and Technology of China Hefei 230026 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China Institute of Particle Physics Central China Normal University Wuhan 430079 China

One of the main purposes of heavy-ion collisions over a wide range of beam energy is to study the bulk properties of strong interaction matter and understand the Quantum Chromo Dy- namics （QCD） phase diagram, which carries wealth of infor- mation of the phase transition and the possibly existing criti- cal point of the strongly interacting system [1]. Such system exists as hadron gases at lower temperature and low baryon density. By increasing the temperature or density, the bound- ary of the hadrons disappears and the confined quarks move freely in the whole system.

关键词： MRPC Conceptual design of the HIRFL-CSR external-target experiment HIRFL TPC CSR

Combustion Synthesis of C/MgAl_(2)O_(4)Composite Powders and Their Microstructure Evolution

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China's Refractories 2021年第4期30卷 7-11页

作者： LYU Lihua DING Donghai xiao guoqing Department of Civil and Construction Engineering Shanxi Institute of TechnologyYangquan 045000China School of Materials Science and Engineering Xi’an University of Architecture and TechnologyXi’an 710043China

This work aims at solving the problems of difficult dispersion,easy oxidation and high cost of nano carbon during application,carbon/magnesium aluminate spinel(C/MgAl_(2)O_(4))composite powders were prepared using MgC2O4·2H2O,MgO2,Al2O3 powder,and Al powder as raw materials by combustion *** results indicate that with the maximum MgC2O4·2H2O addition of 33.34 mass%,the prepared powder contains 1.17 mass%of carbon and carbon distributes among spinel *** MgAl_(2)O_(4)spinel shows both granular and rod-like *** granular MgAl_(2)O_(4)spinel is generated from mutual diffusion between MgO and Al2O3;while the rod-like MgAl_(2)O_(4)spinel is mainly formed by the vapor-solid growth mechanism from Mg vapor and Al2O3.

关键词： C/MgAl_(2)O_(4)composite powders combustion synthesis combustion front quenching test microstructure evolution1

Weak-reduction graphene oxide membrane for improving water purification performance

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Journal of Materials Science & Technology 2020年第4期39卷 106-112页

作者： Hao Yu Yi He guoqing xiao Yi Fan Jing Ma Yixuan Gao Ruitong Hou Jingyu Chen State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China College of Chemistry and Chemical Engineering Southwest Petroleum UniversityChengdu610500China Chengdu Graphene Application Institute of Industrial Technology Chengdu611130China Deakin University Institute for Frontier MaterialsVIC 3220Australia

Two-dimensional(2 D) materials are promising candidates for advanced water purification *** this work, UV reduced GO(Ur GO) membranes on the support of polyvinylidene fluoride(PVDF) had been fabricated for wastewater treatment. The reduction degree of GO membrane on the effect of water purification performance was investigated, and it was found that the weak-reduction GO membrane exhibited the optimal performance of removing pollutant from wastewater than GO membrane. Besides,scanning electron microscopy, X-ray photoelectron spectroscopy, Raman spectra and contact angle tests were used to characterize the physical and chemical properties of the Ur GO membranes, and the permeance and rejection ability of the as-prepared filtration membranes were determined. Due to the weak-reduction of GO, pristine graphitic sp2 domains increased with slightly decreasing D-spacing. Thus,the Ur GO membrane showed a higher water flux of 38.27 L m-2h-1 bar-1, which was improved more than 270% compared to GO membrane, and dyes rejection increased. Those outstanding performances indicated that the Ur GO membrane could effectively regulate the contradiction of the trade-off balance between flux and rejection, and hold great potential in real-world waste-water purification.

关键词： Graphene oxide Membrane UV irradiation Weak-reduction Purification

Kinetics and Mechanism of Oxidation Induced Contraction of MgAl2O4 Spinel Carbon Composites Reinforced by Al4C3 in situ Reaction

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Journal of Wuhan University of Technology(Materials Science) 2020年第4期35卷 778-785页

作者： YANG Mengyao xiao guoqing YANG Ding'ao YUAN Shouqian ZAO Jizeng ZHAO Wei GAO Song ollege of Materials Science and Engineering Xi'an University of Architecture and TechnologyXi'an 710055China Beijing LierHigh-Temperature Materials Co. Ltd.Beijing 102211China Luoyang Lier Refractories Co. Ltd.Luoyang 471023China

Kinetics and mechanism of oxidation induced contraction of MgAl2O4 spinel carbon composites reinforced by Al4C3 in situ reaction were researched in air using vertical high temperature thermal dilatometer from 25℃to 1400℃.It is shown that oxidation induced contraction of MgAl2O4 spinel carbon composites reinforced Al4C3 in situ reaction is the common logarithm of oxidation time t and the oxygen partial pressure P inside MgAl2O4 spinel carbon composites reinforced by Al4C3 in situ reaction in air at 1400℃is as follows:P=F(-2.75×10^-4A+2.13×10^-3)*** nonsteady diffusion kinetic equation of O2 at 1400℃inside the composites is as follows:J=De *** of the total diffusional?flux of oxygen inside the composites at 1400℃is in inverse proportion to the oxidation *** nonsteady state effective diffusion coefficient De of O2(g)inside the composites decreases in direct proportional to the increase of the amount of metallic *** method of preventing the oxidation induced contraction of MgAl2O4 spinel carbon composites reinforced by Al4C3 in situ reaction is to increase the amount of *** slag erosion index of MgO-Al2O3 spinel carbon composite reinforced by Al4C3 in situ reaction is 0.47 times that of MgO-CaO brick used in the lining above slag line area of a VOD stainless steel-making *** of MgO-Al2O3 spinel carbon composite reinforced by Al4C3 in situ reaction is 26.7 MPa,HMOR of the composite is 3.6 times the same as that of MgO-CaO brick used in the lining above slag line area of a VOD *** service life is two times as many as that of MgO-CaO brick.

关键词： kinetics mechanism oxidation contraction MgAl2O4 spinel carbon Al4C3 in situ reaction

Influence of Nano-Al_2O_3 on Properties of Magnesia Chrome Refractories

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China's Refractories 2012年第2期21卷 1-6页

作者： ZHANG Daoyun IIANG Mingxue xiao guoqing HUANG Shaobo Materials Science and Engineering School Xi＇an University of Architecture and Technology Xi＇an 710055 China Sinosteel Refractory Co. Ltd. Luoyang 471039 China

Magnesia chrome bricks were prepared with fiLsed MgO- Cr2 O3 synthesized material, fused magnesite and ：hrome ore as main starting materials. Nano-Al2O3 was tdded into refractories （ 2% , 4% and 6% in mass ） ;ubstit,ting for Al203 micropowder. After m＆ing and ;haping, the bricks were fired at 1 550 ℃, 1 600 91℃, t 650 ℃ and 1 750℃, respectively. The microstruc-ure , sintering property, mechanical properties, thermal ;kock resistance and shtg resistance of the specimens with he addition of nano-Al2O3 were investigated. The results indicate that the performance of brick with 4 mass% of nano-Al2O3 is greatly improred afier firing at 1 650 ℃.

关键词： nano-alumina magnesia chrome refraclo-ries sinlering properly mechanical properties ther-mal shock resistance. slag resistance

The stripper design and test at HIRFL-CSR

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Nuclear Science and Techniques 2010年第4期21卷 237-240页

作者： ZHANG Hongbin xiao guoqing YUAN Youjin XU Hushan LI Zhankui LU Ziwei MAO Ruishi ZHAO Tiecheng Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China

Charge stripping is employed to produce multi-charged ions for injecting the cooling storage *** penetrating through the carbon foil,the widened distribution of ion charge states poses a limit to the ion ***,the carbon foil plays a key role in the charge stripping *** this paper,four strippers for Heavy Ion Research Facility at Lanzhou(HIRFL) and Cooling Storage Ring(CSR) are *** charge state distribution of the stripped ions is measured and the stripping efficiency of the foils is *** experimental results are consistent with the theoretical values.

关键词：兰州重离子加速器 CSR 塔设计多电荷离子重离子研究装置冷却储存环电荷态分布测试

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Foreword

IMP & HIRFL Annual Report 2012年 14-16页

作者： xiao guoqing

The year 2012ends with great progresses at *** celebrated the 55th anniversary of the foundation of the Institute of Modern *** the 55-year developments,the research fields have been extended from the nuclear reactions at the beginning to multidisciplinary fields including nuclear physics,atomic physics,nuclear astrophysics,heavy ion irradiation applications in material sciences,biophysics,space science,and tumor therapy,***,IMP foresees her bright future with the ambitious proposals for HIAF and ADS projects.

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CO2 corrosion behaviors of 13Cr steel in the high-temperature steam environment

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Petroleum 2020年第1期6卷 106-113页

作者： guoqing xiao SiZhou Tan Zhiming Yu Baojun Dong Yonggang Yi Gang Tian Huiyong Yu Shanzhi Shi College of Chemical Engineering Southwest Petroleum UniversityChengdu610500China State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation(Southwest Petroleum University) Chengdu610500China Research Institute of Engineering Technology Xinjiang Oilfield CompanyPetroChinaKaramay834000China

The study aims to explore the corrosion behaviors of 13Cr steel in the high-temperature steam *** corrosion behaviors of 13Cr steel were tested in CO2 auxiliary steam drive environment simulated with the HTHP *** corrosion morphology and product composition were explored by SEM,EDS,XRD and *** exploration results showed the corrosion rate of 13Cr steel in the high-temperature steam environment was less than 0.04 mm/*** corrosion behaviors of 13Cr steel were mainly affected by temperature and chloride ion *** inhibited steam condensation and the compactness of Cr-rich *** the increase in temperature,more droplets were adsorbed on the surface of 13Cr steel and the compactness of the Crrich layer is *** ions affects the activity of Fe atoms in the metal *** chloride concentration increased,Fe^2+concentration in the solution and FeCO3 content in the rich-Cr layer were increased and the rich-Cr layer became looser.

关键词： CO2 auxiliary steam drive Temperature Cl−concentration Corrosion 13Cr steel