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Flow field, sedimentation, and erosion characteristics around folded linear HDPE sheet sand fence: Numerical simulation study

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Journal of Mountain Science 2024年第1期21卷 113-130页

作者： ZHANG Kai ZHANG Hailong TIAN Jianjin qu Jianjun ZHANG Xingxin WANG zhenghui XIAO jianhua College of Civil Engineering Lanzhou Jiaotong UniversityLanzhou 730000China Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China College of Civil Engineering Chongqing UniversityChongqing 400045China Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China

Wind and sand hazards are serious in the Milan Gobi area of the Xinjiang section of the Korla Railway. In order to ensure the safe operation of railroads, there is a need for wind and sand protection in heavily sandy areas. The wind and sand flow in the region is notably bi-directional. To shield railroads from sand, a unique sand fence made of folded linear high-density polyethylene(HDPE) is used, aligning with the principle that the dominant wind direction is perpendicular to the fence. This study employed field observations and numerical simulations to investigate the effectiveness of these HDPE sand fences in altering flow field distribution and offering protection. It also explored how these fences affect the deposition and erosion of sand particles. Findings revealed a significant reduction in wind speed near the fence corner;the minimum horizontal wind speed on the leeward side of the first sand fence(LSF) decreased dramatically from 3 m/s to 0.64 m/s. The vortex area on the LSF markedly impacted horizontal wind speeds. Within the LSF, sand deposition was a primary occurrence. As wind speeds increased, the deposition zone shrank, whereas the positive erosion zone expanded. Close to the folded corners of the HDPE sand fence, there was a notable shift from the positive erosion zone to a deposition zone. Field tests and numerical simulations confirmed the high windproof efficiency(WE) and sand resistance efficiency(SE) in the HDPE sand fence. Folded linear HDPE sheet sand fence can effectively slow down the incoming flow and reduce the sand content, thus achieving good wind and sand protection. This study provides essential theoretical guidance for the design and improvement of wind and sand protection systems in railroad engineering.

关键词： Folded linear HDPE sheet sand fence Numerical simulation Flow field characteristics Protection benefits

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Controls on migration and aggregation for tectonically sensitive elements in tectonically deformed coal:An example from the Haizi mine, Huaibei coalfield, China

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Science China Earth Sciences 2014年第6期57卷 1180-1191页

作者： LI YunBo JIANG Bo qu zhenghui School of Resource and Earth Science China University of Mining & Technology Key Laboratory of Coalbed Methane Resources and Reservoir-Forming Ministry of Education

Tectonically deformed coal(TDC)develops because of the superimposed deformation and metamorphism of a coal seam by tectonic movements.The migration and accumulation of trace elements in TDC is largely in response to stress-strain conditions.To develop a law governing the migration and aggregation of sensitive elements and investigate the geological controls on TDC,coal samples from different deformation sequences were collected from the Haizi mine,in the Huaibei coalfield in Anhui Province,China,and the concentrations of 49 elements were determined by XRF and ICP-MS,and then microscopically analyzed.The results show that the distribution and morphology of minerals in coal is related to the deformation degree of TDC.The evolutionary process runs from orderly distribution of minerals in a weak brittle deformed coal to disordered distributions in ductile deformed coal.According to the elemental distribution characteristics in TDC,four types of element migration can be identified:stable,aggregate,declining,and undulate types,which are closely related to the deformation degree of TDC.Present data indicate that the overall distribution of rare earth elements(REE)does not change with metamorphism and deformation,but it shows obvious dynamic differentiation phenomena along with the deformation of TDC.Tectonic action after coal-formation,brittle or ductile deformation,and the metamorphic mechanism and its accompanying dynamic thermal effects are the main factors that influence the redistribution of elements in TDC.We conclude that tectonic movements provide the motivation and basis for the redistribution of elements and the paths and modes of element migration are controlled by brittle and ductile deformation metamorphic processes.The dynamic thermal effect has the most significant effect on coal metamorphism and tectonic-stress-accelerated element migration and accumulation.These factors then induce the tectonic-dynamic differentiation phenomenon of element migration.

关键词：元素迁移构造变形淮北煤田敏感元件地质控制构造煤煤矿聚集

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Relationship between joint development in rock and coal seams in the southeastern margin of the Ordos basin

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International Journal of Mining Science and Technology 2014年第2期24卷 219-227页

作者： Wang Linlin Jiang Bo Wang Jilin qu zhenghui Li Pei Liu Jiegang School of Resources and Geoscience China University of Mining & Technology Ministry of Education Key Laboratory of CBM Resources and Reservoir Formation Process China University of Mining & Technology

To predict joint development characteristics of coal seams, joint characteristics of rock seams from 88field stations were observed and comparisons were made between joint characteristics of coal and rock seams at 10 coal outcrops. Additionally, detailed joint measurements of underground coal seams were taken at two coal mines. This study investigated the effects of seam thickness, lithology, and structure on joint development and established the relationship between joint development of coal and rock seams, which allowed predictions of predominant joint densities for the No.5 coal seam in the southeastern margin of the Ordos basin. The results show that outcrop and underground coal seams exhibit the same joint systems as rock seams. The joints are mainly upright. Predominant joints strike 55° on average, followed by joints striking 320°. The joint density of the coal seam is 18.7–22.5 times that of the sandstone seam at the same thickness. The predominant joint density of the No.5 coal seam, controlled by the structure, is 4–20 joints per meter. Joint densities exhibit high values at intersecting areas of faults and folds and decrease values in structurally stable areas. The permeability increases exponentially with increasing density of the predominant joints.

关键词：鄂尔多斯盆地煤层厚度联合发展岩石联合密度南缘联合测量联合系统

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Geochemical Characteristics and Sedimentary Control of Pinghu Formation(Eocene)Coal-bearing Source Rocks in Xihu Depression,East China Sea Basin

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Acta Geologica Sinica(English Edition) 2021年第1期95卷 91-104页

作者： SHEN Yulin QIN Yong CUI Min XIE Guoliang GUO Yinghai qu zhenghui YANG Tianyang YANG Liu Key Laboratory of Coalbed Methane and Reservoir Formation Process Ministry of EducationXuzhouJiangsu 221008China School of Resources and Geoscience China University of Mining and TechnologyXuzhouJiangsu 221116China CNOOC Research Institute Co. Ltd.Beijing 100028China College of Energy Chengdu University of TechnologyChengdu 610059China Jiangsu Vocational Institute of Architectural Technology XuzhouJiangsu 221018China

Coal-bearing source rocks of the Pinghu Formation in the Xihu Depression comprise an important material basis of oil and gas resources in the East China Sea Basin.Based on drilling core observation results combined with the analysis and test results of macerals,trace/rare earth elements,and rock pyrolysis,the geochemical characteristics and sedimentary control of coal-bearing source rocks formation are discussed in a high-frequency sequence framework.The results indicate that the macerals composition of the coal-bearing source rocks of the Eocene Pinghu Formation in the Xihu Depression is dominated by vitrinite,with low-medium abundance of exinite and almost no inertinite.The coals and carbonaceous mudstones display higher amounts of total organic carbon(TOC)(14.90%-65.10%),S1+S2(39.24-136.52 mg/g),and IH(191-310 HC/g TOC)respectively,as compared to the mudstones.Organic matter is plotted in typeⅢkerogens and partially in typeⅡ;it is mainly in the low maturity stage.The trace elements results imply that the samples were deposited in a weakly reducing to weakly oxidizing environment and were occasionally affected by seawater.The coal-bearing source rocks were deposited in a relatively oxygen-containing environment.The coal-bearing source rocks development is jointly controlled by the coal accumulation environment,the water conditions affected by ocean currents in offshore basins in China,oxidation-reduction cycles of aqueous media and paleoclimate evolution in a high-frequency sequence framework.

关键词： geochemical characteristics coal-bearing source rock high-frequency sequence Pinghu Formation Xihu Depression

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Tectonically deformed coal types and pore structures in Puhe and Shanchahe coal mines in western Guizhou

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Mining Science and Technology 2011年第3期21卷 353-357页

作者： Li Ming Jiang Bo Lin Shoufa Wang Jilin Ji Mingjun qu zhenghui School of Resource and Earth Science China University of Mining ＆ Technology Xuzhou 221008 China Key Laboratory of Coalbed Methane Resources and Reservoir-Forming of Ministry of Education Xuzhou 221008 China Department of Earth and Environmental Sciences University of Waterloo Waterloo Canada N2L 3G1 Jiangsu Hogan Group Co. Ltd. Xuzhou 221137 China

To evaluate the effect of tectonic deformation on coal reservoir properties, we provide an analysis of the types of tectonically deformed coal, macroand microscopic deformation and discuss pore structural characteristics and connectivity based on samples from the Puhe and Shanchahe coal mines. Our research shows that the tectonically deformed coal mostly includes cataclastic structural coal, mortar structural coal and schistose structural coal of a brittle deformation series. The major pore structures of different types of tectonically deformed coal are transitional pores and micropores. The pore volumes of macropores and visible fracture pores produced by structural deformations vary over a large range and increase with the intensity of tectonic deformation. Mesopores as connecting passages develop well in schistose structural coal. According to the shapes of intrusive mercury curves, tectonically deformed coal can be divided into parallel, open and occluded types. The parallel type has poor connectivity and is relatively closed; the open type reflects uniformly developed open pores with good connectivity while the occluded type is good for coalbed methane enrichment, but has poor connectivity between pores.

关键词：孔隙结构构造煤煤矿类型贵州西部蒲河片状结构连接通道

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光刻制程中的核心工艺技术综述

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集成电路应用 2024年第3期41卷 68-69页

作者：曲征辉沈阳芯源微电子设备股份有限公司辽宁110001

阐述光刻制程的核心工艺技术,分析各工艺步骤特点及异常情况,包括气相成底膜、涂布、前烘、曝光、曝光烘烤、显影、硬烘、检验工序,为未来进一步工艺研究与生产制造提供理论依据。

关键词：集成电路光刻工艺涂胶显影烘烤

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单砂体接触关系及其对水驱开发的影响研究

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石油化工应用 2024年第3期43卷 67-71页

作者：李航张译丹梁亮曲梦绯李龙语赵云刚陈正辉赵振兴中国石油长庆油田分公司第八采油厂陕西西安710018 西安石油大学地球科学与工程学院陕西西安710065 陕西省油气成藏地质学重点实验室陕西西安710065

姬塬油田L27区单砂体接触关系复杂,其接触关系严重影响该地区的油藏分布规律和水驱开发效果。为了研究L27区长4+52、长61油层组的单砂体接触关系及其对水驱开发的影响,本文立足于长4+52、长61油层组的沉积微相及砂体展布特征,综合钻井... 详细信息

姬塬油田L27区单砂体接触关系复杂,其接触关系严重影响该地区的油藏分布规律和水驱开发效果。为了研究L27区长4+52、长61油层组的单砂体接触关系及其对水驱开发的影响,本文立足于长4+52、长61油层组的沉积微相及砂体展布特征,综合钻井、测井等资料进行了单砂体的识别与划分,刻画了该油层组单砂体的垂向和侧向接触关系,进一步厘清了单砂体接触关系对水驱开发的影响。结果表明:研究区单砂体侧向接触关系分为3类,即侧切式、孤立式、对接式,其中,侧切式连通性最好,对接式次之;侧向接触关系主要影响注水见效时间,垂向接触关系主要影响水驱动用程度。该地区的单砂体接触关系对注水开发效果具有明显的影响,提出的潜力层补孔措施对该油藏的开发具有重要的意义,同时也为姬塬油田长4+5、长6油藏单砂体刻画的勘探开发提供了地质基础。

关键词：单砂体水驱开发接触关系长4+5、长6油藏姬塬油田

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Isotopic Chronological Study of the Huangsha-Tieshanlong quartz Vein-Type Tungsten Deposit and Timescale of Molybdenum Mineralization in Southern Jiangxi Province,China

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Acta Geologica Sinica(English Edition) 2011年第6期85卷 1434-1447页

作者： HUANG Fan FENG Chengyou CHEN Yuchuan YING Lijuan CHEN zhenghui1 ZENG Zailin qu Wenjun Key Laboratory of Metallogeny and Mineral Resource Assessment Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 China Chinese Academy of Geological Sciences Beijing 100037 China Geological Survey Team of South Jiangxi Ganzhou Jiangxi 341000 China National Research Center ofGeoanalysis Beijing 100037 China

The Huangsha-Tieshanlong quartz-vein tungsten polymetallic ore deposit, located in the northern Pangushan-Tieshanlong tungsten ore field in eastern Ganxian-Yudu prospecting areas of the Yushan metallogenic belt, is a well-known tungsten deposit in southern Jiangxi province, China. SHRIMP-determined dating of zircons from the Tieshanlong granite yields ages of 168.1±2.1 Ma （n=11, MSWD-1.3）. Rhenium and osmium isotopic dating of molybdenite from the Huangsha quartz-vein tungsten deposit determined by ICP-MS yields a weighted average ages of 153-3 Ma and model ages of 150.22.1 Ma - 155.4-2.3 Ma. The age of the Huangsha tungsten deposit is 10 to 15 Ma later than the Tieshanlong granite, which shows that there might have been another early Late Jurassic magmatic activity between 150 and 160 Ma, a process which is closely related with tungsten mineralization in this area. The Tieshanlong granite, the Hnangsha tungsten deposit and the Pangushan-Tieshanlong ore field were all formed around 150-170 Ma, belonging to products of a Mesozoic second large-scale mineralization. According to the collected molybdenite Re-Os dating results in southern Jiangxi province, the timescale of the associated molybdenum mineralization is 2-6 Ma in the tungsten deposit and the timescale of independent molybdenum mineralization is 1-4 Ma, implying the complexity of tungsten mineralization. Times of molybdenum mineralization are mainly concentrated in the Yanshanian, which includes three stages of 133-135 Ma, 150-162 Ma, and 166-170 Ma, respectively. The 150-162 Ma-stage is in accordance with ages of large-scale WoSn mineralization, which is mainly molybdenum mineralization characterized by associated molybdenum mineralization with development of an even greater-intensity independent molybdenum mineralization. Independent molybdenum mineralization occurred before and after large-scale W-Sn mineralization, which indicates that favorable prospecting period for molybdenum may be in Cretaceous and early late Jurassic.

关键词： SHRIMP zircon U-Pb molybdenite Re-Os ages timescale granite quartz vein-type tungsten deposit Huangsha Tieshanlong Jiangxi

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宿东向斜“挤压弯滑—顶托平移”构造形成机制及验证

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高校地质学报 2023年第2期29卷 261-271页

作者：李浩屈争辉朱冠宇郭梁章必成薛志文中国矿业大学煤层气资源与成藏过程教育部重点实验室徐州221008 中国矿业大学资源与地球科学学院徐州221116 华阳新材料科技集团有限公司一矿阳泉045008 江苏煤炭地质勘探二队徐州221006

宿东向斜形似不对称哑铃,在区域地质图上显得格外醒目,其成因值得关注。文章通过区域大地构造演化背景梳理和宿东向斜构造组合分析,探讨宿东向斜成因,并结合朱仙庄煤矿构造发育特征加以验证。结果表明:宿东向斜可以划分为四类变形区,包... 详细信息

宿东向斜形似不对称哑铃,在区域地质图上显得格外醒目,其成因值得关注。文章通过区域大地构造演化背景梳理和宿东向斜构造组合分析,探讨宿东向斜成因,并结合朱仙庄煤矿构造发育特征加以验证。结果表明:宿东向斜可以划分为四类变形区,包括NE翼整体变形区、SW翼挤入变形区、SW翼挤出变形区和SW翼正常变形区;宿东向斜形成经历了两个关键变形期,即SW向挤压应力持续作用下先后发生的,以层间弯滑调节为特征的宿东向斜和“X”型共轭断裂形成期(挤压弯滑期)和因宿南箱状向斜东南弯折端顶托而沿“X”型共轭断裂平移为特征的挤入挤出期(顶托平移期);朱仙庄煤矿8^(#)煤层煤镜质组反射率光率体记录了形成向斜各期应力的来源方向;8^(#)煤层不同变形类型和程度层滑构造的规律分布是对宿东向斜“挤压弯滑—顶托平移”形成机制的良好响应。提出了一种基于煤层底板等高线的断层走向断距计算方法,并据此定量表征朱仙庄煤矿南部断层的平移方向和距离,进一步验证宿东向斜顶托平移机制。

关键词：徐—宿弧形构造带宿东向斜构造组合挤压弯滑顶托平移构造形成机制

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不同煤级煤大分子结构对应力-应变环境的响应分析

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中国矿业大学学报 2015年第4期44卷 656-663页

作者：屈争辉姜波汪吉林李明中国矿业大学资源与地球科学学院江苏徐州221116 中国矿业大学煤层气资源与成藏过程教育部重点实验室江苏徐州221008

基于20块气煤、焦煤和无烟煤级不同变形类型和程度构造煤的X射线衍射(XRD)测试结果的计算分析,结合不同类型构造煤的形成环境和不同煤级煤的分子结构特征研究,揭示了气煤、焦煤和无烟煤大分子结构对应力-应变环境响应的差异性,结果表明... 详细信息

基于20块气煤、焦煤和无烟煤级不同变形类型和程度构造煤的X射线衍射(XRD)测试结果的计算分析,结合不同类型构造煤的形成环境和不同煤级煤的分子结构特征研究,揭示了气煤、焦煤和无烟煤大分子结构对应力-应变环境响应的差异性,结果表明:不同类型应力-应变环境对气煤、焦煤和无烟煤大分子结构的芳香化进程的影响分别表现为正效应、正负兼有和负效应;除弱变形碎裂煤和气煤级片状煤外,气煤级构造煤样品的面网间距和堆砌度相对同煤化程度原生结构煤分别不同程度减小和增大,减幅和增幅区间分别为[0.029,0.104]和[2.304,6.937],焦煤级构造煤则表现为增减兼有,相应的减幅和增幅区间分别为[-0.042,0.009]和[-4.703,0.415];无烟煤级构造煤表现为分别明显增大和减小,相应的减幅和增幅区间分别为[-0.046,-0.031]和[-7.970,-3.239]。

关键词：构造煤 X射线衍射煤级应力-应变环境大分子结构

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