On Mars, Location and Orientation of Dykes Exposed along the Valles Marineris Walls Reveal Expected and Unexpected Stress Fields

Structural and geomorphological analysis of the Martian surface in the visible spectral range using the NASA/Viking images in the 90’s,complemented by experimental modelling(Mège and Masson,1996a;Mège et al.,2003)suggested that the Valles Marineris trough(chasma)system is aligned with a mafic dyke swarm,named the Syria Planum Dyke Swarm.Cross-cutting relationships and

The Ophir Chasma Dyke Swarm: Description and Implications for the Genesis of the Valles Marineris Northern Troughs

An extensive survey of dykes in the Valles Marineris troughs(chasmata)on Mars has been undertaken.Most dykes are observed along the chasma walls(Mège and Gurgurewicz,2016),in the spur-and-gully morphology that

半潜式钻井平台船体与隔水管耦合动力特性研究

对一座应用于南海深水的半潜式钻井平台及其隔水管在实际作业环境下的耦合动力学行为进行了研究,建立了平台船体、系泊缆和隔水管的耦合分析模型,时域内分析不同的顶部张力对系统力学特性的影响,并确定了在该海区极端环境条件下能够进行钻井作业的与控制因素,提出了改善的工程建议。研究结果表明:隔水管顶部的垂向运动以低频运动为主,且与平台垂荡运动相关性较差,顶部张力应在隔水管水中重量的1.0~1.2倍范围。在给定的设计条件下,该平台能够进行钻井作业的极端条件为5年一遇季风,在该环境条件下,井口处产生的轴向载荷将达到极限。