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下沉条件
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  相似匹配句对
     condition and implement the p.
     条件及 p.
短句来源
     Therein A Let Z be a Banach space, / 6 C(X. R) , satisfying the P. S. condition, Cbe the unique critical value of / in [c, b] C R suppose that all the comsected component of K, are isolated points.
     S. 条件,c是f在[c,b](?)
短句来源
     Analysis on Penetration of Bucket Foundation
     桶形基础下沉条件分析
短句来源
     THE STUDY ON THE CHARACTER OF STRATA SUBSIDENCE DURING REPEAT MINING
     重复采动条件下覆岩下沉特性的研究
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According to the stratotypes of sedimentary, the platform-type Carboniferous in the south of Northeast China can be subdivided into 3 sedimentary geographic zones (blocks), namely,East Liaoning-South Jilin, South Liaoning, West Liaoning sedimentary geographic zones (blocks), which belong to secondary stratotypes (subtypes)of North China-type Carboniferous, and the different sedimentary stratotypes resulted from different paleostructure and paleogeographic pattern during the subsiding of Carboniferous North China...

According to the stratotypes of sedimentary, the platform-type Carboniferous in the south of Northeast China can be subdivided into 3 sedimentary geographic zones (blocks), namely,East Liaoning-South Jilin, South Liaoning, West Liaoning sedimentary geographic zones (blocks), which belong to secondary stratotypes (subtypes)of North China-type Carboniferous, and the different sedimentary stratotypes resulted from different paleostructure and paleogeographic pattern during the subsiding of Carboniferous North China platform. So, they had the general character with North China-type Carboniferous as well as respective specific character. The available information indicates that Lower Carboniferous definitely exists in East Liaoning,South Jilin,West Liaoning and South Liaoning. The results provide evidence for studing North China geology history anew.

东北南部的地台型石炭系,按其沉积层型可划分为3个沉积地理区(块),即辽东—吉南沉积地理区(块)、辽南沉积地理区(块)和辽西沉积地理区(块),它们当属于华北型石炭系的次级层型(亚型),是在石炭纪华北总体下沉的条件下各自受不尽相同的古构造、古地理格局控制的结果。它们既有华北型石炭系的共性,又表现了其个性。现有资料表明,辽东、吉南肯定存在下石炭统,辽南、辽西存在下石炭统也可基本肯定,从而为重新认识华北地质史提供了重要素材。

Suction effect is emphasized according to the basic equations of equilibrium and some practical cases. To ensure the penetration of bucket foundation, increasing penetration force or decreasing penetration resistance is adopted. Adding foundation weight can increase the penetrate force, how ever , the weight only is not enough to reach the aimed penetration depth sometimes. Suction can not only increase the penetration force, but also reduce the penetration resistance. Theoretically, the maximum suction...

Suction effect is emphasized according to the basic equations of equilibrium and some practical cases. To ensure the penetration of bucket foundation, increasing penetration force or decreasing penetration resistance is adopted. Adding foundation weight can increase the penetrate force, how ever , the weight only is not enough to reach the aimed penetration depth sometimes. Suction can not only increase the penetration force, but also reduce the penetration resistance. Theoretically, the maximum suction is dependent on water depth, but it is restricted by pump, soil property and structure strength in fact. The penetration resistance includes skirt tip resistance and skirt friction resistance, which is reduced through seepage of water in the soil induced by suction. Other methods such as jetting and electroosmosis are also available. The combining methods are used in practice.

从桶形基础下沉时的基本方程入手,讨论了影响基础下沉的条件.保证基础下沉可通过增大插入力或减小阻力实现,增加基础重力可增大插入力,但仅靠重力有时并不能达到预定插深.使用负压可同时增大插入力和减小阻力,插入力是由作用在顶板上的桶内外压差产生的,其大小与顶板有效承压面积及压差有关.为产生负压,首先应保证在自重插深时桶与土壤之间有足够的密封,理论最大负压与工作水深有关,但实际可利用的最大负压受排水泵能力、土壤性质及结构强度等因素的限制.使用喷冲和电渗也可以减小下沉阻力.工程应用可将上述各种方法组合使用.

 
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