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high dam     
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  高坝
     The Effect of Age of Loading and Aggregate Gradation on theFracture Energy (G_F)and Fracture Toughness (K_(IC))of High Dam Concrete
     龄期及粗骨料级配对高坝混凝土断裂能G_F和断裂韧度K_(IC)的影响规律
短句来源
     GRNN Model Study on Multi-point Deformation Monitoring in the Bedrock of High Dam
     高坝基岩多点变形监测的GRNN模型研究
短句来源
     Determination of atomized concentration by β-ray method during flood discharge from high dam
     用β射线测定高坝泄洪雾化浓度
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     ECOLOGICAL SANATION OF TE (Thermoelectric Plant of otanj) - CONSTRUCTION OF HIGH DAM MADE FROM SLAG, ASH AND FUME DESULPHURIZATION PRODUCTS ON A SUBSIDING AREA
     TE(otanj电厂)的生态修护作用-利用矿渣、粉灰和烟灰在沉陷区域建造高坝
     Study on model law for intensity of rainfall from atomization of flood-discharging flow for high dam
     高坝泄洪雾化降雨强度模型律研究
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  高拱坝
     Simulation Analysis of Jinping High Dam Temperature Field during Construction Period
     锦屏高拱坝施工期温度场仿真分析
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     Once the great important structure, such as high building, high dam undergo destroyed, the effect will be quite serious.
     高层结构、高拱坝等重大建筑结构一旦遭受破坏,后果将相当严重。
短句来源
  高坝坝
     Mechanical Behavior and Analysis Theories of Crossfeed between High Dam Body and Complex Foundation
     高坝坝体与复杂坝基互馈的力学行为及其分析理论
短句来源
     Study on Rock Mass Engineering for High Dam Foundation
     高坝坝基岩体工程研究
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     Energy Dissipation Within High Dam of Glory Inlet and Combination of Silo & Hole Staff
     高坝坝内旋流式竖井加洞塞组合消能研究
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     It is affirmed thab the lower section rockmass of soft weathering bend through ce- ment grouting,constructs a gool high dam foundation
     确认弱风化带下段岩体经水泥灌浆处理后是一个良好的高坝坝基岩体.
短句来源
  坝高
     According to the statistics at the beginning of nineties of 20th century,among the constructed and being constructed high dam, ECRD is in the proportion of 55.5% around the world.
     据20世纪90年代初统计,世界上已建和在建的坝高230m以上的高坝中,土质心墙堆石坝约占55.5%。
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     A lot of planned hydropower projects that the height of its dams are up to 200 to 300 meters and the spillway discharges are 20,000 to 50,000 m3/s, will be founded in the 21st century, this will challenge the high dam hydraulics for some new problems.
     在21世纪,我国拟建一批坝高200~300米、泄洪流量20000~50000m~3/s的大型水利工程,这些工程在泄洪消能方面向高坝水力学提出了新的挑战。
短句来源
     The paper puts forward a new energy dissipator by way of gyrating current shaft in dam, in allusion to high dam, large discharge, narrow river valley.
     针对水电工程开发面临的坝高、流量大、河谷窄的问题,提出了新型的坝内旋流式竖井泄洪消能;
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     The Longtan hydropower station includes a high RCC gravity dam with a height of 216.5 meters. It will be constructed by two stages. In the first stage a 192 m high dam will be built.
     龙滩水电站大坝为高碾压混凝土重力坝,最大坝高216.5m,分两期建设,前期坝高192m。
短句来源
     With the development of worker's theory of the dam and science and technology, the construction of high dam prevails day by day, in order to meet the demand that people increase day by day, the dam is increasing constantly high, the size of high dam changes with each passing day, high dam water flow state more and more difficult to control, so high dam water flow state sluice research, building of object type wave in the outstanding position more and more.
     随着坝工理论及科技技术的发展,高坝建设日益盛行,为了满足人们日益增长的需求,坝高不断加高,高坝体型日新月异,高坝水流流态越来越难以控制,因此高坝水流流态及泄水建筑物体型的研究越来越摆在突出的位置。
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      high dam
    -We have examined the digital waveform data and relocated a number of events within the June 1987 earthquake swarm, which occurred beneath the northern part of Lake Aswan, 70 km southwest of the Aswan High Dam in Egypt.
          
    Previous estimates of average annual evaporation from the lake formed by the High Dam at Aswan, Egypt, fall in the range from 4.65 mm d-1 to 7.95 mm d-1.
          
    Net radiation has been measured for the first time over the Aswan High Dam Lake on the Nile River for 132 days including warm and cold seasons.
          
    Effect of storage reservoirs on the behavior of rock masses of high dam beds
          
    Measurement of the upper pool levels of a high dam during construction
          
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    To be able to locate the point of inception of air entrainment is of considerable significance in the design of ski-jump spillways for high dams, in that this is not only prerequisite to the theoretical analysis of jet diffusion in the air and the subsequent alleviation of erosion as the aerated jet dives to the bed, but also essential if the possible benefit of aeration in the reduction of concrete pitting is to be evaluated. Although past contributions to this problem are numerous, no method has yet...

    To be able to locate the point of inception of air entrainment is of considerable significance in the design of ski-jump spillways for high dams, in that this is not only prerequisite to the theoretical analysis of jet diffusion in the air and the subsequent alleviation of erosion as the aerated jet dives to the bed, but also essential if the possible benefit of aeration in the reduction of concrete pitting is to be evaluated. Although past contributions to this problem are numerous, no method has yet been available to yield the correct prediction of the onset of aeration in or downstream of the curvilinear portion of the spillway which is known to take place much earlier than usual. Even for the straight portion of the spillway, calculated positions of aeration inception do not always match with the observed values (see table 1, and compare columns 4 to 7). In this paper is presented a rational and yet rather simple procedure with which one may treat the general problem of locating the position of aeration inception no matter if the spillway contains a curve or not. In the first place, the irrotational or "ambient" flow outside of the boundary layer is studied. In view of the fact that the flow over the spillway of a high dam is much smaller in extent laterally than longitudinally, an approximation similar to that used in the derivation of boundary layer equations from the Navier-Stokes equations is applied to the Euler equations. The resulting expressions indicate that the usual assumption of concentric streamlines is justifiable. The depth of flow is taken as that so calculated plus the displacement thickness of the boundary layer. Since on the plane of the complex potential, the flow over a spillway may be formulated as a simply-mixed boundaryvalue problem, Wood's exact method is applied to a numerical example with gravitational effect taken into consideration. The result of calculation indicates that both methods yield practically the same depth of flow. The inception of aeration is, as usual, assumed to occur as the boundary layer meets the free surface. Under the combined influence of gravity and boundary geometry, the flow over a dam is continuously accelerated or decelerated. In such case, boundary-layer computation by usual method is both involved and of doubtful accuracy. It is found, however, that in the case of flow over a spillway, the flow outside of the turbulent boundary layer conforms to a condition of self-preservation as proposed by Townsend. Since the Reynolds number for high dams may surely reach very high values, the turbulent boundary layer itself may be assumed to be approximately self-preserving. In short, this means that Townsend's theory of approximate self-preservation for boundary layers under the influence of longitudinal acceleration may be applied. This also means that the computation of boundary layer development may be much simplified. Based on an analysis of prototype data, it is found that in the present case involving air-entrainment inception, thickness of the boundary layer should be defined as that at which the mean velocity is within 0.1% of the velocity of flow outside the boundary layer. In the carrying out of the computations, boundary layer thickness at various sections are first estimated, then the irrotational flow outside the boundary layer is analysed by the simplified method to obtain the surface profile and the parameter "a" denoting the variation of velocity along the surface, and finally Townsend's theory of approximate self-preservation is applied to recompute the thickness of the boundary layer along the spillway. As any error made in the estimation of boundary-layer thickness has little effect on the computation of surface profile and hence on any subsequent computations, reasonably experienced computers should find it unnecessary to repeat the computations. Results of computations are found to be within 10% of the observed data obtained at two dams.

    鉴于现有掺气发生点的计算方法误差可达观测值的70%以上,本文根据原型掺气发生点观测资料探讨较准确的计算方法,在无特殊干扰的条件下,掺气的发生取决于紊流边界层的发展.坝面边界层流动的特点是:雷诺数高(u_1x/,v在10~8至10~(10)之间),坝面粗糙,和水流先加速后减速因而纵向流速梯度对边界层发展的影响必须考虑.针对这些特点和坝面及陡槽高速水流具有自模性质,本文建议应用自模理论进行计算.计算的掺气点位置与实测位置比较误差减至10%左右,从而为掺气发生点或坝面紊流边界层的计算提供了较可靠的方法.

    The paper describes the compaction characteristics of clayey soil. In view of the basic conception that the optimum degree of saturation Srop under various compaction energy is constant, and the optimum moisture content of the standard compaction energy is approximately the plastic limit, a method by using plastic limit wP and optimum saturation for estimation of the maximum dry density is presented as follows:γdmax=Srop·G3/G3wp+Sropwhere G3 is the specific gravity of the soil particles,wP is the plastic limit.Methods...

    The paper describes the compaction characteristics of clayey soil. In view of the basic conception that the optimum degree of saturation Srop under various compaction energy is constant, and the optimum moisture content of the standard compaction energy is approximately the plastic limit, a method by using plastic limit wP and optimum saturation for estimation of the maximum dry density is presented as follows:γdmax=Srop·G3/G3wp+Sropwhere G3 is the specific gravity of the soil particles,wP is the plastic limit.Methods of determining the compaction criterion of clayey soil are discussed and the coefficient of construction m is introduced and demonstrated with suggestion value 0.95~0.97 for medium and low dams, and 0.97~0.99 for high dams.

    本文总结了粘性土的压实特性,从不同击实功能下土料的压实最优饱和度S_(rop)为常数、标准击实功能的最优含水量ω_(op)约等于塑限ω_p这些基本概念出发,提出了用塑限、最优饱和度来估算粘性土的最大干容重γdmax。即S_(rop)=C,W_(op)=ω_p且当W_p≤17%,S_(rop)=(3ω_p+35)%ω_p>17%,S_(rop)=(0.3ω_p+80)%γdmax=(Gs·S_(rop))/(Gs·ω_p+S_(rop))在文中讨论了确定粘性土压实标准的方法,并对施工条件系数m进行了论证,提出了建议数值。即对于中低坝:m=0.95~0.97对于高坝:m=0.97~0.99

    A curve of equal cavitation number ( abbreviated as ECN curve ) is proposed for buckets of high-dam spillways. Based on simplified analysis, equations for the calculation of such a curve have been developed. These equations may be conveniently solved by a Runge-Kutta scheme. Applications to high-dam spillways show that the effective head of a spillway as far as cavitation potential is concerned may be materially reduced by adopting the ECN curve for the bucket. In one case, the effective...

    A curve of equal cavitation number ( abbreviated as ECN curve ) is proposed for buckets of high-dam spillways. Based on simplified analysis, equations for the calculation of such a curve have been developed. These equations may be conveniently solved by a Runge-Kutta scheme. Applications to high-dam spillways show that the effective head of a spillway as far as cavitation potential is concerned may be materially reduced by adopting the ECN curve for the bucket. In one case, the effective head of a spillway with a drop of 111.5m is thus reduced to 62m.

    本文给出了等空化数线的计算方程和应用龙格——库塔法的计算框图。采用等空化数线反弧可使最小泄洪空化数显著提高。

     
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