查询词典 dams

But in recent years, the domestic and international gravity dams that are built recently are more and more few, and the gravity dams that were built in early stage have serious safe problems basically, which decide that the problem of consolidated gravity dams will become a outstanding problem in circle of w...

近年来，国内外新建的重力坝越来越少，而早期所建的重力坝，基本上都存在着严重的安全问题，这就决定着重力坝的加固必将成为世界上水利界一个突出性的问题，从而也就决定了预测重力坝使用寿命的重要性。

It was shown that the great variation of effective unit weight and angle of internal friction of soil could result in the increase of seepage failure probability of earth dams, the effect of variation of angle of internal friction of soil was greater, and the seepage failure probability of earth dams was sensitive to variability of dam seepage. In addition, the increase of water level in reservoir would also induce great increase of seepage failure probability of earth dams.

结果分析表明，坝体渗透破坏的概率随着土体有效重度和内摩擦角变异性的增加而增加，并且土体内摩擦角的变异性对坝体渗透破坏的影响较大，坝体渗透变异性对坝体渗透破坏的影响较大；另外，随着库水位的升高，坝体发生渗透破坏的概率也显著增加。

Many dams built before 1945 and located in the southwestern United States, such as the Coolidge, Stewart Mountain, and Parker dams in Arizona and the Riant and Matilija dams in California, have shown signs of alkali-silica reactivity in the concrete.

许多位于美国西南部在1985以前建造的大坝，像在亚利桑那州的Coolidge，Stewart Mountain，Parker大坝和在加利福尼亚州的Riant，Matilija大坝，都显示了在混凝土中硅碱反应的特征。

This aticle deduas a set of formlas for dead weight boing calculation of overflow secion of gravity dam that can be adopted in solid gravity dams such as concrete dams and grouted rubble dams.

重力坝的溢流坝段剖面由多段曲线组成，因此准确地计算溢流坝段的自重荷载就较为麻烦，常常用折线来代替曲线进行简化计算，影响了工程设计的精度。

This research is very important to improve the safety of high arch dams against strong earthquakes. It provides science references for design of high arch dams and technical guidance for taking steps to reduce hydrodynamic pressures and dynamic responses of high arch dams in earthquakes.

研究了拱坝在强地震中的动水压力和降低动水压力的气幕隔震技术，对提高拱坝的抗震安全性具有重要的科学意义和实际价值，对高拱坝的抗震设计和采取工程措施减小动水压力提供理论依据和技术指导。

A study was performed of the randomness of external loads on high arch dams,including flood,earthquake,landslide of mountains,etc.,the weakening of concrete strength of arch dams and rock strength of dam foundation,and the fuzziness of evaluation criterion.The disadvantages of conventional deterministic assessment methods for the safety of arch dams based on the strength theory and stability theory were analyzed respectively.It is suggested that fuzzy mathematics theory should be introduced to safety evalua...

研究高拱坝洪水、地震、山体滑坡等外载荷，坝身混凝土、坝基岩石材料强度弱化等的随机性，以及评价准则的模糊性；分析了高拱坝分别基于强度理论和稳定理论确定性评价方法的不足，提出应该利用模糊数学方法解决具有随机性、模糊性的高拱坝安全评价问题；建立了基于结构可靠度理论的高拱坝失效概率故障树模型并给出了具体算例。

In addition, thelecturer goes on to discuss the issue that people used the dams and canals formany other useful methods in Anasazi, which also conflicts with the point thatthe dams and canal serve as a symbol as the shortage of water inAnasazi.

这篇文是我目前看到的综合写作中非常棒的一篇~表达很地道，语言也流畅~也是篇用了模板的文章，但是难得在模板和作者的语言结合的非常好，非常的自然。

The whole basin water reserves are equivalent to the U.S. for more than 14 total. E salmon-rich river .20 30s the U.S. government began to cascade development of the River and integrated management, in the dry and its tributaries, to build a series of dams and power stations, of which the most famous Grand Coulee dams as high as 168 meters long and 1272 m.

全流域水力蕴藏量相当于美国总量的14以上。E河中盛产鲑鱼。20世纪30年代美国政府开始对该河进行梯级开发和综合治理，在干、支流上建立一系列水坝和电站，其中，最著名的大古力水坝高达168米，长1272米。

Economics professor Pedro Arrojo-Agudo, who teaches at the University of Zaragoza in Spain, is using his academic expertise to battle a monster: the National Hydrological Plan, a $25 billion project that would build 120 dams on the Ebro River. The dams would submerge entire towns along Spain's second-longest river, displace tens of thousands of rice and fish farmers, and poison the wetlands of the river delta with salt.

在西班牙萨拉戈萨大学任教的经济学家培德洛E亚若杰阿古多（Pedro Arrojo-Agudo）运用他的专业知识，和一头大怪物「国家水文计画」奋力对抗，这是一项高达250亿美元的计画，将在伊布罗河上建立120座水坝，这些水坝会淹没西班牙第二大河沿岸的数个城镇、迫使数以万计的农夫和渔民迁徙，并使河口三角洲的湿地被盐侵蚀。

The maj or obj ect of this paper is the medium.small size concrete dams that have been used for many years.They have the characteristic that the alteration of water height of reservoirs is unobvious and the dams, displacements are affected mainly by temperature.With a case,the method of stepwise regression is used to analyze the vertical displacement prototyDe observed data.Then regression equation is established,the relation of dam,s displacement with hydraulic pressure、temperature、time effect is analyzed and the displacement change rule is obtained,the dam'S displacement onlv dependent to temperature is received.According to the theory of Finite Elements Method,the quasi-stationary temperature field formula and temperature stress formula are deduced.The QTP program and TFEM3D program are written with FORTRAN.The same case is calculated through QTP program to solve the quasi-stationary temperature and through TFEM3 D program to solve the dam'S displacement and find tlle dam,s deformation rule.This rule is accordant with the regression,S resuIt.

本文主要针对运行期间库水位变化很小、坝体的位移主要受温度变化影响的中小型混凝土坝，结合工程实例，采用逐步回归的方法对垂直位移原型观测资料进行分析，建立回归方程，分析坝体位移与水压、温度、时效之间的关系以及位移变化规律，分析结果坝体位移只与温度有关，而基本上不受库水位变化和时效的影响；根据有限元原理推求了混凝土坝准稳定温度场公式和温度应力公式，利用FORTRAN语言编制出QTP准稳定温度场程序和TFEM3D位移场程序，对大坝的温度场和位移场进行计算，求出坝体结点的变温值和坝体结点位移值以及单元应力分量，分析得到大坝的变形规律与实测资料以及回归统计变形规律一致，说明对坝体准稳定温度场的研究是正确的。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。