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Unified principle for determining the safety factor of structures against sliding


Optimal anchoring force against sliding of a body on two planes


Two failure patterns against sliding are analyzed.


The stability of shallow foundation must be checked against sliding failure and bearing capacity failure.


The results of these tests are used in an analysis of stability against sliding along the given interface.

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 In this paper a discussion on the adoption of the seismic coefficients and on safety evaluation in aseismatic design of gravity dams on rock foundations is presented.The discussion is based on further investigations the seismic response of the Xinfengjiang Dam, the Koyna Dam and some other gravity dams selected.In aseismatic design of gravity dams, usually based on static method or socalled pseudostatic method using conventional seismic coefficients and static parameters for calculating the shearing strength,... In this paper a discussion on the adoption of the seismic coefficients and on safety evaluation in aseismatic design of gravity dams on rock foundations is presented.The discussion is based on further investigations the seismic response of the Xinfengjiang Dam, the Koyna Dam and some other gravity dams selected.In aseismatic design of gravity dams, usually based on static method or socalled pseudostatic method using conventional seismic coefficients and static parameters for calculating the shearing strength, a basic evaluation of the overall stability against sliding of the dam subjected to earthquake, though far from being satisfactory, can usually be obtained. Stress calculation based on such methods, however, is often misleading. Therefore, it is advisable to take a different approach.Applicating the method of dynamic analysis and adopting a design seismic coefficient for the expected ground motion of the dam foundation to estimate the earthquake loadings and stresses, combining them with those produced by normal loads and comparing them with the paremeters for static strength, one may then arrive at a reasonable safety evaluation of a dam.This paper deals mainly with the problem of stability against sliding.The authors present the concept of relative seismic stability, which shall be helpful to indicate the rule of stability against sliding of dams subjected to earthquake and, consequently, to make sure the safety of the dam.In the investigation the dynamic coupling action between the dam and the reservoir water was taken into consideration,the dam and the reservoir water being treated as an assemble of finite elements.The analysis was carried by both the methods of response spectrum and timehistory. And the combined effects of dynamic and static loadings were introduced.  本文在通过对新丰江和柯依那(Koyna)大坝的震害情况进一步分析,和选择了其它一些重力坝进行研究后,提出了岩基上重力坝抗震设计地震系数的采用及安全性估算的意见. 在重力坝的抗震设计中,按照静力法或拟静力法和经验的地震系数、抗剪强度的静力指标检验大坝的抗滑稳定性,是可以得到基本估计的,但还存在某些问题;尤其是,在进行坝体强度校核时,往往会使人产生误解.因此,作者认为有必要采用动力分析法和预计的设计坝基地震系数,以估算地震荷载和应力,并与正常荷载的情况组合,取强度的静力指标作出比较,才能得到近乎合理的安全估算. 文中着重研究了大坝滑动稳定性问题,提出了抗震的稳定相对安全率的概念,它有助于揭示地震时大坝抗滑稳定的变化规律,并作出安全的估算. 在分析时,将坝体和库水作为有限单元的集合体,考虑了坝体与库水在振动时耦合作用,按反应谱法和时程法进行动力分析,得出了动力和静力的综合成果.  The stability of giavity dams on rock foundations are generally ex pressed in terms of its factor of safety against sliding, the ratio of the frictional force along the foundation to the force tending to cause slid ing, but the cohesive force is neglected.It has merely been expressed as K_s=f·∑V/∑H ·Where f is the coefficient of friction between the dam and its foundation,∑H the summation of horizontal forces acting on the gravity dam and ∑V the summation of vertical forces acting on it. It is... The stability of giavity dams on rock foundations are generally ex pressed in terms of its factor of safety against sliding, the ratio of the frictional force along the foundation to the force tending to cause slid ing, but the cohesive force is neglected.It has merely been expressed as K_s=f·∑V/∑H ·Where f is the coefficient of friction between the dam and its foundation,∑H the summation of horizontal forces acting on the gravity dam and ∑V the summation of vertical forces acting on it. It is obvious that the value of friction coefficent greatly affects safety and economy of a dam. In this article the author pointed out that the values of friction coefficient of gravity dams adopted in China were rather too small, and proposed some experimental data in designing for various types of dams of small and mediumsized reservoirs so as to reduce the construction cost.  在我国,岩基上重力坝的抗滑稳定往,以往普遍采用不计及凝聚力的摩擦公式计算。抗剪摩擦系数(简称摩擦系数)值的大小,对重力坝工程的安全性与经济性的影响颇大。本文目地在于:1、论证我国重力坝的抗剪摩擦系数取值一般偏低,2、提出抗剪摩擦系数的推荐值供中小型重力坝工程设计中使用,以求降低工程造价。  This paper concerns with the findings obtained from the tridimensional geomechanical model experiment to study the stability against sliding of the foundation of the second channel sluice of Gezhouba Project. The experimental results show that it can enhance the factor of safety of foundation stability about 20%, if several engineering measures such as providing slab of antipercolation or deepening the upstream cutoff are taken. The overloading coefficient amounts to 2.4, when the measures above mentioned... This paper concerns with the findings obtained from the tridimensional geomechanical model experiment to study the stability against sliding of the foundation of the second channel sluice of Gezhouba Project. The experimental results show that it can enhance the factor of safety of foundation stability about 20%, if several engineering measures such as providing slab of antipercolation or deepening the upstream cutoff are taken. The overloading coefficient amounts to 2.4, when the measures above mentioned are fulfilled. These results have been compared with those obtained from the bidimensional geomechanical model experiment. Under the corresponding conditions in which the lateral pressures of bed rock of both the models are neglected and the engineering measures remain unchang ed, the overloading coefficients of both models are considerably close and the foundation failure are of the same pattern.  本文论述了用三维地质力学模型对葛洲坝工程二江泄水闸的抗滑稳定问题进行实验研究的成果。实验成果表明,采取防渗板或深齿墙等工程措施可提高稳定安全度约20％,采取这些措施后超载系数可达2.4左右。与二维地质力学模型实验成果比较,在都不考虑基岩侧压力和在同样工程措施情况下,两者的超载系数比较接近而其破坏形式也是一致的。   << 更多相关文摘 
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