Study on Global Performances and Mooring-Induced Damping of A Semi-Submersible   总被引：1，自引：1，他引：0  

熊凌志  杨建民  吕海宁  赵文华  寇雨丰 《海洋工程》2016,(5):671-686

The harsh environmental conditions bring strong nonlinearities to the hydrodynamic performances of the offshore floating platforms, which challenge the reliable prediction of the platform coupled with the mooring system. The present study investigates a typical semi-submersible under both the operational and the survival conditions through numerical and experimental methods. The motion responses, the mooring line tensions, and the wave loads on the longitudinal mid-section are investigated by both the fully non-linearly coupled numerical simulation and the physical experiment. Particularly, in the physical model test, the wave loads distributed on the semi-submersible’s mid-section were measured by dividing the model into two parts, namely the port and the starboard parts, which were rigidly connected by three six-component force transducers. It is concluded that both the numerical and physical model can have good prediction of the semi-submersible’s global responses. In addition, an improved numerical approach is proposed for the estimation of the mooring-induced damping, and is validated by both the experimental and the published results. The characteristics of the mooring-induced damping are further summarized in various sea states, including the operational and the survival environments. In order to obtain the better prediction of the system response in deep water, the mooring-induced damping of the truncated mooring lines applied in the physical experiment are compensated by comparing with those in full length. Furthermore, the upstream taut and the downstream slack mooring lines are classified and investigated to obtain the different mooring line damping performances in the comparative study.  相似文献   

基于自发地理信息的“一带一路”区域陆路交通状况分析     

寇培颖  牛铮  刘正佳  李旺 《地球信息科学学报》2018,20(8):1074-1082

路网密度的研究是实施“一带一路”愿景之互联互通倡议的基础工作。“一带一路”顺应了世界经济全球化、一体化、多极化、信息化的趋势,牵连着蓬勃发展的亚太和发达的欧洲经济圈,带动中间国家的经济发展。在新形势下,如何通过交通基础设施建设推进丝绸之路经济带沿线区域间的互联互通、促进区域合作和经济发展,具有重要的现实意义。本文利用自发地理信息数据——OpenStreetMap（OSM）道路网数据,运用地理信息系统（GIS）空间分析技术,探究了“一带一路”陆路经济带辐射区域亚欧大陆的路网络密度和通行能力的空间分布格局,并分析了六大经济走廊节点城市的公路可达性空间格局。结果表明：“一带一路”陆路经济带的交通基础设施的发展存在着不平衡现象;路网密度和通行能力均呈现沿海高内陆低的空间格局;中亚、西亚地区和中南半岛地区成为道路水平落后带,限制了丝绸之路经济带资源整合与贸易畅通,建议在建设新跨国公路铁路同时,对原有老旧道路进行加宽加固等升级改造;全区域道路等级级配不合理;节点城市可达性具有明显的分异状况,六大经济走廊中83%的区域可达性在10 h以内。研究产出亚欧大陆1 km分辨率路网密度和通行能力数据集,发现了“一带一路”陆路经济带道路水平的薄弱区域,为“一带一路”陆路经济带的交通基础设施建设以及进一步的道路网研究提供了基础数据。  相似文献   

辽宁省海水入侵成因及防治措施     

寇英杰  王颖 《国土资源》2000,(1)

海水入侵是在自然和人为因素综合作用下形成的地质灾害。辽宁省海水入侵自 70年代以来呈逐渐增加趋势 ,具有入侵面积广、发展速度快等特点。目前海水入侵已成为我国较为突出的地质灾害 ,给工农业生产和人民生活造成很大危害。针对海水入侵形成机制及危害程度的地域性 ,目前已采取不同的防治措施 ,如控制开采 ,人工回灌 ,修建地下水库等 ,取得一定效果。  相似文献   

Initiation and Development of the Late Cenozoic Uplift of Daluo Mountains, Northeastern Margin of the Tibetan Plateau     

KOU Linlin  DONG Xiaopeng  LI Zhenhong  CUI Jiawei  MA Zhaoying  LI Hailong 《《地质学报》英文版》2022,96(6):1917-1931

Daluo Mountains lie at front of the arcuate tectonic belt at the northeastern margin of the Tibetan Plateau, and are the landform boundary zone between the active Tibetan Plateau and the stable North China Craton. Studying of the late Cenozoic uplift evolution of Daluo Mountains is important for understanding the expansion mechanism of the northeastern margin of the Tibetan Plateau and its influence on the western North China Craton. In this study, the late Cenozoic uplift of Daluo Mountains is constructed from the development of the late Cenozoic alluvial fan around Daluo Mountains. The entire sedimentary sequence and framework of the fan was revealed by the newly obtained drilling core data. The cosmogenic nuclide, optically stimulated luminescence, and detrital zircon U-Pb dating results provide new evidences for discussion about the initial timing of the late Cenozoic uplift of Daluo Mountains and the key stages of uplift during the Pleistocene. The late Cenozoic alluvial fan at front of Daluo Mountains overlies a set of fluvial-facies strata; therefore, development of the alluvial-fan marks the start of late Cenozoic uplift of Daluo Mountains. The timing of this event can be constrained to ~4.64 Ma. Two extensive gravel layers (dated to ca. 0.76–0.6 Ma and ~0.05 Ma) developed during the Pleistocene, indicating two episodes of considerable uplift. This study provides a new time scale for the uplift and expansion of the arcuate tectonic belt at the northeastern margin of the Tibetan Plateau.  相似文献   

北京利用土地处理技术将再生水回补地下水可行性探讨   总被引：3，自引：0，他引：3  

杨庆  郭萌  刘予  谢振华  林健  寇文杰 《城市地质》2010,5(1):7-10

本文从北京市再生水的现状．土地处理技术的理论、国外已经开展再生水土地处理后回补地下水含水层的实践,以及北京的实际条件出发,分析了在北京开展再生水通过土地处理技术后,回补地下水含水层试验的可行性。  相似文献   

青海五龙沟金矿矿集区Ⅰ号韧性剪切带~(40)Ar/~(39)Ar年龄及地质意义     

寇林林  罗明非  钟康惠  赵昌新 《新疆地质》2010,28(3)

对五龙沟金矿矿集区NW向韧性剪切带中金矿点中的黑云母进行40Ar/39Ar法同位素测年,结果为(242.72±1.69)Ma,表明含金剪切带韧-脆性剪切活动时代及金成矿时代为印支期.区域地质资料显示,此韧性剪切带变形运动学和变形时序与印支期构造-岩浆热液活动事件较一致,其地球动力学背景为造山带构造演化后碰撞伸展构造环境.  相似文献   

西秦岭安房坝金矿床矿化花岗闪长岩脉锆石U-Pb年龄、微量元素及Hf同位素特征     

夏清  李永胜  李雪峰  寇银川 《岩石学报》2021,37(6):1713-1730

安房坝金矿床位于"甘肃崖湾-大桥地区金锑矿"整装勘查区,是近十年来找矿工作中新探获的一处中型规模石英脉型金矿床。矿区内花岗闪长岩脉发育,空间上与石英脉型金矿体密切伴生,局部有金矿化。通过对两类不同矿化蚀变程度脉岩样品中的锆石CL图像特征及LA-ICP-MS微量元素分析,本文识别出了岩浆锆石与热液锆石两类不同成因的锆石。其中热液锆石通常作为岩浆锆石增生边出现,具有典型的暗色增生边结构,更高的普通铅含量及Th、U含量,比原生岩浆锆石更加富集轻稀土且Ce正异常特征不明显。通过对花岗闪长岩样品AFB.21中的岩浆锆石U-Pb定年获得安房坝金矿区花岗闪长岩脉体的侵位年龄约为219.6±2.8Ma,安房坝金矿床金成矿作用应晚于该时间。AFB.20、AFB.21两件样品中热液锆石U-Pb定年工作表明安房坝金矿区存在224～217Ma的岩浆期后热液活动。两类锆石具有相似的Hf同位素组成,表明两者是同一岩浆作用过程演化的结果,ε_(Hf)(t)值为-2.5～-15.8,t_(DM2)=1917～3097Ma,指示其可能来自于太古代-古元古代的古老地壳物质重熔。本次研究支持大桥-崖湾-安房坝一带存在隐伏岩体的剩余重力异常解译结果。蚀变花岗闪长岩脉体与隐伏岩体,以及该脉体中热液锆石与矿区内的金矿化的关系值得进一步研究与探讨。  相似文献   

Stratigraphic Framework of the Cryogenian in China     

YU Yang  YE Qin  ZHANG Kexin  HE Weihong  SONG Bowen  XU Yadong  KOU Xiaohu  WANG Jiaxuan  YANG Fengli 《《地质学报》英文版》2020,94(4):942-971

The Cryogenian is a critical period in the history of the Earth. It is marked by multiple extreme climate changes that caused alternating global glacial and interglacial intervals. These dramatically changed the sedimentary system, and metal ores and source rocks distributed widely during this period. Therefore, studying the Cryogenian stratigraphic framework and sedimentary basins is important to improve the stratigraphic resolution for metal mineral and hydrocarbon prospecting and exploration in China. This review paper firstly divides three tectonic-stratigraphic regions in China in the Cryogenian, including the tectonic-stratigraphic regions of Great South China, Xingmeng-Tarim, and North China. Secondly, geochronologic data and geological records are combined to clearly depict the Cryogenian sedimentary sequence of continental blocks and micro-continental blocks in different tectonic-stratigraphic regions. The results were used to propose a new comparison scheme of stratigraphy for the Cryogenian in China. Finally, according to differences of sedimentary evolution and tectonic evolvement, sedimentary basins and their lithofacies paleogeography are identified and summarized, respectively.  相似文献   

兴岭滑坡治理工程事故原因分析          下载免费PDF全文

朱忠荣  寇国祥 《探矿工程》2005,32(5):33-36

兴岭滑坡发生于1998年3月，为防止边坡再次滑动，需要对滑坡体进行加固治理。由于强降雨和人为因素，在治理工程施工过程中滑坡体发生滑动，造成了比较严重的工程事故。介绍了兴岭滑坡治理工程概况、事故情况，对兴岭滑坡治理工程施工过程中造成挡土墙倾覆的具体原因进行了稳定性理论分析，根据工程所处的水文、地质环境剖析了设计、施工存在的问题。  相似文献   

试论监理在地质灾害治理工程中的控制作用     

朱忠荣  蔡启龙  寇国祥 《中国地质灾害与防治学报》2005,16(2):154-158

目前三峡水库区地质灾害治理正大规模地分期实施，监理作为治理工程参建的重要一方，如何根据监理理论采取相应的手段及措施，发挥监理工程师对工程“质量、进度、投资”3大目标的控制作用，从而使地质灾害治理工程取得良好的社会效益和经济效益，是值得探讨的重要课题。文章结合三峡水库区Ⅱ期地质灾害治理工程监理实践经验，就监理在治理工程中的控制作用分别从“质量、进度、投资”等方面进行了较详细地探讨。最后指出，与其它建设工程一样，监理在地质灾害治理工程中发挥着其他任何一方不可替代的作用。同时提出地质灾害治理工程中尚存在“监理取费偏低，监理人员的专业配置不合理，未对监理人员针对地质灾害工程的特点专门培训”等急需解决的问题。  相似文献