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参数法在悬臂式挡土墙底板尺寸设计中的应用 总被引:4,自引:2,他引:4
通过对悬臂式挡土墙设计特点的分析 ,提出了运用参数法进行墙趾板和墙踵板截面的设计计算 ,并进一步探讨了地基承载力对底板尺寸的影响。算例表明 ,该方法能简化设计过程 ,所得到的结果更加合理 相似文献
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The Shallow Meridional Overturning Circulation in the Northern Indian Ocean and Its Interannual Variability 总被引:3,自引:0,他引:3
The shallow meridional overturning circulation (upper 1000 m) in the northern Indian Ocean and its interannual variability are studied, based on a global ocean circulation model (MOM2) with an integration of 10 years (1987-1996). It is shown that the shallow meridional overturning circulation has a prominent seasonal reversal characteristic. In winter, the flow is northward in the upper layer and returns southward at great depth. In summer, the deep northward inflow upwells north of the equator and returns southward in the Ekman layer. In the annual mean, the northward inflow returns through two branches: one is a southward flow in the Ekman layer, the other is a flow that sinks near 10°N and returns southward between 500 m and 1000 m. There is significant interannual variability in the shallow meridional overturning circulation, with a stronger (weaker) one in 1989 (1991) and with a period of about four years. The interannual variability of the shallow meridional overturning circulation is intimately r 相似文献
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The anti-overturning ability and structure safety of jack-up unit in in-place condition are often affected by environment loads, especially wind load. According to the MODU rule, the projected area method is used for calculating the wind load. However, the calculated results are conservative and not good for structure optimization design. In this paper, a 400 ft jack-up is studied as an example. Based on the wind tunnel test and numerical simulation method, some key points of wind load calculation, such as shielding effect, lift effect and shape coefficient of component, are discussed. The study shows that the points mentioned above, which are ignored in the MODU rule calculation, result in the conservative result. 相似文献
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29日白天,又有多艘船舶抵达现场参与救助,但"嘉定关"轮继续向右倾斜,直至它的最大浸水角——40度。到15点35分,甲板上的原木才抵抗不住倾斜,开始散落入海。16点45分,"嘉定关"轮沉没于北纬20度49分,东经113度44分处。 相似文献
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挡土墙截面设计直接计算方法 总被引:11,自引:2,他引:11
在满足挡土墙地基承载力验算要求的基础上,推导了抗倾覆安全系数的允许取值范围表达式,同时将相关参数用截面底部宽度进行表示,并给出了换算系数的关系曲线图,进而结合抗滑移稳定性要求直接进行挡土墙截面设计。算例表明,该方法简捷直观且结果可靠,可供设计人员参考。 相似文献
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关于重力式挡土墙截面尺寸确定方法的探讨 总被引:8,自引:4,他引:8
在进行重力式挡土墙设计时 ,设计人员由于抓不住该类型挡土墙的设计要点 ,导致需经过多次试算才能得到正确的挡土墙尺寸。笔者通过分析得到以下方法 :通过满足挡土墙的抗滑移要求确定挡土墙总的工程量 ,再进行细部尺寸的调整以满足挡土墙的抗倾覆要求。运用以上方法一般均不需反复计算 ,经过一次计算即能同时满足抗倾覆及抗滑移稳定性要求 相似文献
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对坦墙墙后土体第二破裂面的研究 总被引:3,自引:0,他引:3
基于土的塑性极限分析理论,从挡土墙最小抗倾覆安全系数和挡土墙背上的最大主动土压力两个角度,分别研究了坦墙后土体中第二破裂面的位置,认为在复杂的挡土结构墙背条件下,用最小抗倾覆安全系数来研究挡土墙后土体的破坏机制较为合理。 相似文献
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