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Study on Model Tests and Hydrodynamic Force Models for Free Spanning Submarine Pipelines Subjected to Earthquakes 总被引：1，自引：0，他引：1
A test rig is built to model the dynamic response of submarine pipelines with an underwater shaking table in the State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, China. Model tests are carried out to consider the effects of exciting wave directions and types. Based on the experimental results, two hydrodynamic force models derived from Morison equation and Wake model are presented respectively. By use of hydrodynamic force models suitable for free spanning submarine pipelines under earthquakes, discretized equations of motion are obtained and finite element models are established to analyze dynamic response of free spanning submarine pipeline subjected to multi-support seismic excitations. The comparison of numerical results with experimental results shows that the improved Morison and Wake hydrodynamic force models could satisfactorily predict dynamic response on the free spanning submarine pipelines subjected to earthquakes. 相似文献
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粤北瑶岭钨矿矿化类型多样性与叠加性研究 总被引：3，自引：0，他引：3
粤北地处南岭钨锡成矿带的西南部,区内已发现众多规模大小不同的矿床(点),组成了著名的钨矿化集中区.瑶岭是其中一个中型石英脉型黑钨矿床,由于长期开采,瑶岭钨矿山原保有的黑钨矿资源储量濒临枯竭.2004年,在矿区南部碳酸盐岩与花岗岩岩体的接触带附近发现了夕卡岩型白钨矿化,不久又在矿区中深部的花岗岩体中发现了受断裂构造控制的构造蚀变型白钨矿工业矿化,揭示了钨矿化类型的多样性和叠加性.通过对区内不同类型钨矿化分布规律总结,将为钨矿化集中区新一轮的钨矿地质找矿工作提供新启示. 相似文献
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凡口铅锌矿区闪锌矿的成因矿物学特征研究 总被引：3，自引：0，他引：3
通过野外观察、光学显微镜、X射线衍射、扫描电镜及微区能谱分析、流体包裹体成分及盐度测定、稳定同位素(S、O、H)分析等手段,研究了广东凡口铅锌矿区闪锌矿的某些成因矿物学特征.结果表明,凡口矿区闪锌矿具有3个世代,分别形成于铅锌成矿期的3个成矿阶段.各世代闪锌矿在产出特征,表观颜色,结晶形态,解理发育程度,晶体常数,铁含量,流体包裹体的成分、盐度、氢氧同位素组成、硫同位素组成及同与其连生的方铅矿的平衡分馏温度等方面均存在规律性差别.从早期阶段到晚期阶段,成矿流体的演化特征是:成矿温度和成矿流体盐度从低到高再到低,流体包裹体成分从Na+-Ca+-Cl-型到K+-Ca+-Cl-型再到Na+-Ca+-Cl-型,δ18O、δD及δ34S均由高到低变化,但δ18O、δD及δ34S自中期阶段到晚期阶段降幅显著大于从早期阶段到中期阶段的降幅,反映晚期阶段至少有部分δ18O、δD及δ34S均显著较低的岩浆源流体参与成矿.认为凡口铅锌矿成矿流体主要为燕山早期区域岩浆热事件加热的中低温混合源循环热卤水,成矿中晚期有岩浆热液参与成矿. 相似文献
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