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裂缝稳定性
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  crack stability
     Second, according to the strain-equivalent principle, the damage field near the crack tip of mode I in concrete is derived under both static and dynamic loading. Finally, based on the concept of "permissable damage scale". which serves as a criterion for evaluating crack stability, the analysis of coupling the concepts of damage and fracture can be realized.
     本文首先将文[3]给出的混凝土静力损伤本构方程推广到动力损伤本构方程上,进而根据损伤力学的应变等价性原理,推出了混凝土Ⅰ型裂缝在动静荷载作用下缝端附近的损伤场,最后提出了用于判断裂缝稳定性的“允许损伤尺度”概念,实现了损伤与断裂的耦合分析,为把损伤理论应用到混凝土断裂力学中提供了一个新的途径。
短句来源
     Preliminary analysis of temperature cracks and crack stability of concrete
     混凝土的温度裂缝及其裂缝稳定性初探
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     Some problems related to crack stability of concrete dams in the field of dam monitoring are studied in this dissertation using theories and mathematics such as chaos theory, fractal geometry, artificial neural networks, grey system theory, motion stability theory, catastrophe theory, and so on.
     本文应用混沌理论、分形理论、人工神经网络、灰色系统理论、运动稳定性理论、突变理论等理论和方法,对大坝安全监测中有关裂缝稳定性的相关问题进行研究。
短句来源
     Thus CTOD_c criteria can well be used to analyse the crack stability oflarge concrete structures.
     因此,采用CTOD_c从准则可以很好地应用于大体积混凝土结构的裂缝稳定性分析。
短句来源
     Secondly, the basic theory and method of linear-elastic fracture mechanics are summarized and the open process of gravity dam heel crack is analyzed. Combining with software ANSYS, the crack stability analysis of the simply supported beam and gravity dam is studied based on fracture mechanics theory. Compute accuracy of stress and displacement is satisfied and some reasonable results are obtained.
     接着概述了线弹性断裂力学基本理论和方法,分析了重力坝坝踵裂缝的开裂过程,应用ANSYS软件对基于断裂力学理论的简支梁和重力坝进行了裂缝稳定性分析,应力和位移计算精度令人满意,取得了比较合理的结果,为重力坝坝踵裂缝应力强度因子计算提供了一个合理的计算方法。
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  stability of crack
     Based on analyzing the mechanism of destabilization of crack in dam, the mutation model is established by use of catastrophe theory, and the criterion of the stability of crack is given.
     在研究裂缝失稳机理及特征的基础上 ,应用突变理论 ,建立了裂缝的突变模型 ,并得出裂缝稳定性的判据 .
短句来源
  “裂缝稳定性”译为未确定词的双语例句
     Therefore, linear elastic fracture mechanics can be applied to stability analyses of cracks in mass concrete structures and to improving design methods of hydraulic structures.
     因此线弹性断裂力学可以很好地应用于大体积混凝土结构的裂缝稳定性分析和改进水工结构的设计方法。
短句来源
     Stability and propagation of cracks at the heel of high arch dams
     高拱坝上游坝踵裂缝稳定性及其扩展
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     Analysis of Stability of Cracks in the Diamond Head of a Buttress Dam
     单克墩大头坝劈头裂缝稳定性分析
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     Stabilization analysis of cracks in one concrete dam
     砼坝裂缝稳定性分析
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     A 3 D Boundary Element Method and Minimum Strain Energy Density Factor Theory (S theory) were used to study the stability and propagation of cracks at the heel of high arch dams using a double curved arch dam as a case study.
     以一个双曲拱坝为实例 ,用三维断裂分析边界元法和最小应变能密度因子理论研究了高拱坝上游坝踵裂缝稳定性及扩展的情况。
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  crack stability
Expressions describing the conditions of crack stability are obtained.
      
Crack stability in linear elastic fracture mechanics
      
The static case of crack stability is a particular solution of the general propagation equation.
      
Crack stability can also be treated as an eigenvalue problem.
      
Fracture criterion and crack stability in grooved beam-like testpieces
      
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  stability of crack
Based on the asymptotic solution, a fracture criterion is proposed and the stability of crack propagation is discussed.
      
The stress intensity factors are used to construct crack paths and to determine the stability of crack propagation.
      
It is also shown that the two-dimensional Cotterell-Rice theory for the effect of tensile stress acting parallel to the crack surface on the stability of crack path is valid for the axisymmetric crack.
      
The relationship between the stability of crack propagation in, and the fracture surface appearance of, DGEBA epoxy resins cured with TETA has been investigated using a linear elastic fracture mechanics approach.
      
The stability of crack growth was found in all cases to be very dependent on initial notching.
      
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Cracks in the massive concrete of hydraulic structures are most harmful because of the mechanical and physical action of the percolating water. Since it is rather difficult to estimate whether the cracks are stable or not by convensional design methods,most hydrostructures are often designed under conservative consideration. The theory of fracture mechanics are now widely used in aeronautical and mechanical engineering with good results, but it is seldom used in hydraulic structures. In this paper, some possible...

Cracks in the massive concrete of hydraulic structures are most harmful because of the mechanical and physical action of the percolating water. Since it is rather difficult to estimate whether the cracks are stable or not by convensional design methods,most hydrostructures are often designed under conservative consideration. The theory of fracture mechanics are now widely used in aeronautical and mechanical engineering with good results, but it is seldom used in hydraulic structures. In this paper, some possible applications of fracture mechanics in designing massive concrete works are described and shown with numerical examples,including. (1) the criteria for the stability of cracks or joints in massive concrete by the stress intensity factor, (2) the amount required and the effect of the reinforcement for closing the cracks,(3) the determination of crack depth. However,for the further development of this theory in practical design work,more tests and research works are still needed.

水工建筑物大体积混凝土中产生延伸较长的裂缝后,由于缝中渗透水流的物理和力学作用,将对建筑物产生有害的影响.因此许多水工建筑物都有防裂要求.但是,采用普通的设计理论既不易保证不开裂,更难判断一旦形成微细裂缝后裂缝的稳定性,因而常不得不采用较为保守的准则和方法.断裂力学的发展对研究解决金属材料裂缝的有关问题已取得很好的效果,从而在金属结构设计中已被广泛采用,但在水工结构中的应用尚属少见.本文讨论了断裂力学在水工设计中的几种应用可能,例如:混凝土中贯穿缝的稳定性;并缝钢筋的作用及计算方法;裂缝延伸深度的确定;以及混凝土坝上游面的开裂问题等,并给出了数例.这些建议都是从理论推导得出,是否适用有待实践考验.总之,断裂力学可能是水工设计中一种有用的工具,但要在实践中广泛采用还需要进行大量的研究试验工作.

Zhexi hydroelectric station was built in 1958.It is a large dam of 104 meters in height.Retaining structure is a buttress dam with diamond head. In recent year cracks have been found in the diamond head of a buttress dam.The stability of the dam is dependent on the extension of crack and the application engineering way to be limited development of cracks.This paper deals with the basic principle for the determination of stress -intensity factors and its measurement techniqie concerned.Based on the theory of...

Zhexi hydroelectric station was built in 1958.It is a large dam of 104 meters in height.Retaining structure is a buttress dam with diamond head. In recent year cracks have been found in the diamond head of a buttress dam.The stability of the dam is dependent on the extension of crack and the application engineering way to be limited development of cracks.This paper deals with the basic principle for the determination of stress -intensity factors and its measurement techniqie concerned.Based on the theory of fracture mechanics the authors give a general photoelastic method so called "Isoparametric method" to be used to determine the mixed mode stress-intensity factors.Using recommended by authors method had been determining opening-mode and sliding-mode stress -intensity factors about crack top in the diamond head of a conterfort dam.In view of the results obtained both from experiments and analysis it has been clarified that to remove alleviat hydrostatic pressure as much as possible in the crack is an effective way for increasing the stability of a buttress dam.It must be noted that the triangular-concrete cannot limit the prolongation of the crack in the diamond head.

柘溪水电站建于1958年,坝高104米,系钻石形的单支墩大头坝.近年来,一、二号坝段的大坝头部相继产生了裂缝,引起了各方面的注意.大坝的稳定性取决于裂缝是否继续扩展和采用何种安全加固的工程措施.为此,进行了三维光弹性研究. 本文介绍了用光弹性法确定应力强度因子的基本原理和测试技术,并提出了一种光弹性条纹图确定混合型应力强度因子K_1和K_(11)的普遍分析法——等参数法.同时应用此法研究了柘溪水电站大头坝裂缝区域的张开型和滑移型的应力强度因子. 研究的结果表明,消除缝内水压力是保持裂缝稳定性的有效途径.值得注意的是,虽然采用混凝土三角塞的临时措施,但仍不足于防止裂缝的进一步扩展.

An analysis of horizontal crack on the upstream face and heel of gravity dams with the view of linear elastic fracture mechanics shows: there is an allowable region of horizontal crack in the upstream face of the dams, the development of crack on the heel is the incipient failure of the dam. Stability of the crack should be checked by the method of fracture mechanics, which should be a supplemental stability condition of the gravity dams.

本文以线弹性断裂力学的观点对重力坝上游坝面和坝踵水平进行了分析,结果表明:重力坝上游存在一个允许水平裂缝区;坝踵裂缝扩展是重力坝破坏的开始.应该用断裂力学方法校核坝踵裂缝的稳定性,并以此作为重力坝稳定的补充条件.

 
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