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排序方式: 共有69条查询结果,搜索用时 463 毫秒
61.
David Petruska Jeff Geyer Rick Macon Michael Craig Alex Ran Neil Schulz 《Ocean Engineering》2005,32(7):767-782
The Mad dog project will use a polyester mooring system on the drilling and production truss spar. This will be the first use of a permanent polyester mooring system on a Floating Production System (FPS) outside of Brazil and the first time polyester has been used on a spar. As such, there were many challenges, which include:
- • Regulatory approval.
- • Designing a mooring system which is dominated by current loadings.
- • Largest polyester rope break load ever required.
- • Rope design qualification and testing.
- • Quality control and assurance.
- • Inspection, Maintenance, Repair and Retirement (IMRR) of such a mooring system.
62.
Experimental investigations on model single pile anchor and pile group anchors of configuration 2 × 2 subjected to uplift
loads were conducted on dry Ennore sand, obtained from Madras, India. The embedment length to shaft width ratios, L/d = 20 and L/d = 30, and enlarged base width to shaft width ratios, B/d = 1,2,3, center to center spacing of pile anchors in the groups, 3d, 4d, 6d and 8d were used. The load displacement response,
ultimate resistance and variation of group efficiency with L/d, B/d and spacing have been studied quantitatively and qualitatively. For short pile group anchors (L/d = 20), the isolation spacing appears to be at a spacing of about 4d to 6d and 8d for B/d = 1 and B/d = 2 and 3, respectively. For long pile group anchors (L/d = 30), the isolation spacing appears to be at a spacing of about 4d, 6d and 8d for B/d = 1, 2 and 3, respectively. The analytical model of limit equilibrium method has been proposed to predict the net uplift
capacity of pile group anchors. The predicted results compare reasonably well with the experimental results. 相似文献
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厦门同安湾滩槽演变趋势的遥感分析 总被引:2,自引:0,他引:2
利用多时相遥感图像判释厦门同安湾入海河流分布、海岸类型及浅海滩槽地貌,并根据海水表层流场特征和浑水带(悬浮泥沙)分布扩散特征及不同时期的海图,对同安湾泥沙供应现状和运移规律以及浅海滩槽冲淤变化、演变趋势进行了分析研究。结果表明,厦门同安湾海岸类型已由类型较齐全的天然海岸演变成单一的人工海岸,泥沙运移走向在平面上展示了逆时针泥沙水平环流特征,潮汐通道和局部海域出现了冲淤变化,部分潮滩处于缓慢淤积状态中。演变的动力因素主要是潮流,其次是径流,人工海岸形成后,陆源泥沙对海域基本不产生影响。 相似文献
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68.
Experimental study on the influence of seismic subsidence of loess under bidirectional loading modes
《地震研究进展(英文)》2021,1(4):100064
Water content, dry density, void ratio, depth of soil layer, and seismic loading may all exert influence on the seismic subsidence of loess. Many scholars have carried out seismic subsidence tests of loess to simulate the stress on soil using unidirectional (axial) vibration instead of bidirectional vibration. We conduct seismic subsidence tests of loess using two different dynamic stress loading methods, unidirectional and bidirectional dynamic stress. In addition, the effects of different dynamic stress loading modes on the development of seismic subsidence of loess are compared for a case-study in northwestern China. The results show that (1) the increasing ratio of radial stress to axial stress has exerted significant influence on the seismic subsidence coefficient of loess under the loading mode of bidirectional dynamic stress (2) there is a critical ratio of radial stress to axial stress for seismic subsidence of loess, ranging from 0.6 to 0.8; when the ratio of radial load to axial load is greater than the critical value, the effect of bidirectional load on the development of seismic subsidence is more remarkable (3) when the ratio of radial load to axial load is smaller, the seismic subsidence of loess calculated by the existing unidirectional stress loading method is safe for engineering projects. However, if the value exceeds the safety ratio range it is dangerous to conduct safety evaluations using the seismic loess subsidence. The prediction value of seismic subsidence at engineering sites directly affects the later foundation treatment and the safety of the overlying structures. The seismic subsidence calculation and evaluation method in this study may provide a scientific basis for safety evaluations of loess sites in northwestern China. 相似文献
69.
Hani Rezayan Mahmoud Reza Delavar Andrew Ulrich Frank A. Mansouri 《International Journal of Applied Earth Observation and Geoinformation》2010
This paper studies emergence/generation of power law in rank-order distribution of axial line length, which is a global pattern observed in real cities, due to interaction of a set of seven simple spatial rules at a local scale. These rules and their interactions form a model expected to simulate the morphological structure of free spaces in unplanned organic pedestrian small cities. Effects of each of the seven rules are discussed through repeated simulations of eight possible combinations of the rules, using a bottom-up process. The results show that the rules generate environments with statistically stable rank-order distribution of axial line length that follows the power law. It means that the axial maps of the simulated environments have a scale-free hierarchical structure such that their distributions lean toward short axial lines. It also represents dominance of local spatial structure, as the model renders a faster rate of growth at a local scale while allowing a steady growth at a global scale. 相似文献