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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

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基于双粘型防水材料的高水压隧道新型堵水限排方案及设计方法

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隧道建设（中英文） 2024年第3期44卷 564-575,I0069-I0080页

作者：孙晓贺施成华肖国庆葛洋洋中南大学土木工程学院湖南长沙410075 中国电建集团中南勘测设计研究院有限公司湖南长沙410014 北京东方雨虹防水技术股份有限公司特种功能防水材料国家重点实验室北京101309

为解决高水压隧道渗漏水病害并减少治理成本,基于双粘型喷膜防水材料,提出一种由注浆加固圈、双粘型防排水系统和防水衬砌3部分组成的新型堵水限排方案。依托数值计算方法,揭示该方案的水压分布特征并论证其有效性,进而分析注浆圈及排... 详细信息

为解决高水压隧道渗漏水病害并减少治理成本,基于双粘型喷膜防水材料,提出一种由注浆加固圈、双粘型防排水系统和防水衬砌3部分组成的新型堵水限排方案。依托数值计算方法,揭示该方案的水压分布特征并论证其有效性,进而分析注浆圈及排水板各参数对隧道涌水量及衬砌水压力的影响规律;在此基础上,提出高水压隧道多级控制型限排方案的设计方法。研究结果表明:1)新型堵水限排方案可通过调节注浆圈及排水板参数使二次衬砌水压力降低到可接受范围;2)与传统高水压隧道主要依靠注浆圈来调节渗水量及衬砌水压力不同,新型限排方案可采用注浆圈+排水板多级调控方法,方案设计更加灵活,其中注浆圈占主导作用;3)注浆圈对降低隧道渗水量及衬砌外水压力均有利,其中渗透系数参数最为重要;4)仅当注浆圈渗透系数得到保障时,才存在合理的排水板间距使衬砌水压力与隧道渗水量控制在合理范围内。

关键词：高水压隧道双粘型防水堵水限排喷膜防水渗流分析

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超声手术刀声学系统设计和实验

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应用声学 2024年第2期43卷 436-442页

作者：韩道成杨志波郭强肖国庆河南理工大学机械与动力工程学院焦作454000

为兼顾阶梯型变幅杆的高放大系数以及曲线过渡变幅杆突变截面处的高疲劳强度,提出了一种最速曲线过渡段的复合变幅杆,并对装配有该变幅杆的超声刀声学系统进行一系列实验。首先,基于等效电路法,设计了夹心式压电换能器和最速曲线型变幅... 详细信息

为兼顾阶梯型变幅杆的高放大系数以及曲线过渡变幅杆突变截面处的高疲劳强度,提出了一种最速曲线过渡段的复合变幅杆,并对装配有该变幅杆的超声刀声学系统进行一系列实验。首先,基于等效电路法,设计了夹心式压电换能器和最速曲线型变幅杆的基本结构。在此基础上,结合超声刀的工作条件和材料特性,对换能器-变幅杆基本结构进行精确设计。然后,利用有限元法和实验法获取了换能器纵振频率以及频率响应曲线,证明了该文所设计换能器的有效性。最后,对所设计的换能器进行了一系列测试。结果表明:应用最速曲线的超声刀换能器谐振频率与输出端振幅与设计目标、仿真结果相吻合,连接负载后凝血,切割效果良好,满足设计需求。

关键词：超声换能器等效电路有限元法谐振频率

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Dissolution-precipitation mechanism of self-propagating high-temperature synthesis of TiC-Cu cermets

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Journal of University of Science and Technology Beijing 2007年第6期14卷 568-572页

作者： guoqing xiao Feng Duan Gang Zhang Quncheng Fan School of Materials Science and Engineering Xi＇an University of Architecture and Technology Xi＇an 710055 China State Key Laboratory for Mechanical Behavior of Materials Xi＇an Jiaotong University Xi＇an 710049 China

The mechanism of self-propagating high-temperature synthesis （SHS） of TiC-Cu cermets was studied using a combustion front quenching method. Microstructural evolution in the quenched sample was observed using scanning electron microscope （SEM） with energy dispersive X-ray （EDX） spectrometry, and the combustion temperature was measured. The results showed that the combustion reaction started with local formation of Ti-Cu melt and could be described with the dissolution-precipitation mechanism, namely, Ti, Cu, and C particles dissolved into the Ti-Cu solution and TiC particles precipitated in the saturated Ti-Cu-C liquid solution. The local formation of Ti-Cu melt resulted from the solid diffusion between Ti and Cu particles.

关键词： TiC-Cu cermet self-propagating high-temperature synthesis microstructural evolution synthesis mechanism combustion front quenching method

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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

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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

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基于生物信息学未分化甲状腺癌LncRNA基因与免疫浸润机制及中药预测的研究

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辽宁中医杂志 2024年第2期51卷 6-11,I0001,I0002页

作者：易希善柏婷燕肖国庆杨维杰王苑铭康学东甘肃中医药大学甘肃兰州730000 甘肃中医药大学附属医院甘肃兰州730000

目的基于GEO数据库对未分化甲状腺癌基因数据进行差异分析、基因富集分析和免疫浸润分析,为深入了解未分化甲状腺癌免疫相关机制及治疗提供理论依据。方法利用GEO数据库检索有关ATC的芯片,根据样本数量及芯片类型,筛选出符合条件的芯片... 详细信息

目的基于GEO数据库对未分化甲状腺癌基因数据进行差异分析、基因富集分析和免疫浸润分析,为深入了解未分化甲状腺癌免疫相关机制及治疗提供理论依据。方法利用GEO数据库检索有关ATC的芯片,根据样本数量及芯片类型,筛选出符合条件的芯片,借助R语言软件筛选出符合条件的差异基因,筛选ATC中差异表达的lncRNA,构建LncRNA-miRNA-mRNA网络图,并构建蛋白质-蛋白质相互作用关系网络(PPI)并进行GO富集分析和KEGG通路分析。同时利用CIBERSORT反卷积法对22种免疫细胞在未分化甲状腺癌中的浸润情况进行分析。并通过Coremine Medical进行治疗中药预测。结果经检索GEO数据库找到编码为GSE65144的基因芯片,利用R语言分析筛选出LncRNA差异基因127个,其中上调基因51个,下调基因76个,并对差异基因绘制ceRNA网络;将得出的LncRNA进行PPI网络分析,筛选出核心基因20个,排名靠前的有MYC、JUN、EGLN3、KIF23、YWHAH。GO富集分析显示其参与了RNA聚合酶Ⅱ启动子的转录调控、RNA聚合酶Ⅱ启动子转录的正调控、细胞增殖的正调控、细胞迁移的正调控等生物学过程,KEGG主要富集通路为癌症信号通路、MAPK信号通路、PI3K-AKT信号通路等。免疫浸润结果显示甲状腺未分化癌(anaplastic thyroid carcinoma,ATC)中巨噬细胞M0和巨噬细胞M2显著增高,而浆细胞和T细胞γ-δ显著减少。单核细胞和中性粒细胞呈显著正相关(r=0.90),活化的肥大细胞和中性粒细胞呈显著正相关(r=0.88),活化的肥大细胞和单核细胞呈显著正相关(r=0.72),嗜酸性粒细胞和CD_(4)T细胞呈显著正相关(r=0.72),T细胞γ-δ和滤泡辅助T细胞呈显著正相关(r=0.71)。并且,巨噬细胞M2和浆细胞呈显著负相关(r=-0.70),T细胞γ-δ和活化的树突状细胞呈显著负相关(r=-0.68),T细胞γ-δ和巨噬细胞M0呈显著负相关(r=-0.56)。预测中药主要集中在清热解毒药和补虚药,归经主要为肝、脾、肾经。结论ATC患者基因差异表达和免疫细胞浸润率的个体差异比较显著。在ATC肿瘤组织中具有高比例浸润的免疫细胞是其治疗的潜在目标。中药治疗是一个新的方向,有待后续的临床及基础实验加以验证。

关键词：未分化甲状腺癌生物信息学长链非编码RNA 免疫浸润机制中药预测

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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

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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

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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

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