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裂缝形成
相关语句
  crack formation
    2. The main factor of the crack formation in concrete of pump stations is analyzed and the mechanism of the crack on concrete of pump stations is studied.
    2.分析了水工泵站混凝土裂缝形成的主要原因,研究了水工泵站工程混凝土的开裂机理。
短句来源
    Based on the introduction of basic geological characteristics and relaxed-tension crack feature of a typical bank slope with relaxed-tension crack, the state and trend of bank slope stress are analyzed before and after tension crack formation as well as after water storage of the reservoir.
    在简述某典型卸荷拉裂岸坡基本地质特征及卸荷拉裂特征的基础上,通过三维有限元数值模拟,分析了拉裂缝形成前、后岸坡的应力状态,以及库区正常蓄水后岸坡应力场的发展趋势。
短句来源
  fracture formation
    Calculation and Study on the Mechanism of Leaky Fracture Formation in Water Storaged Dam
    水库蓄水后渗漏裂缝形成机理的理论计算与探讨
短句来源
  crack formation
    2. The main factor of the crack formation in concrete of pump stations is analyzed and the mechanism of the crack on concrete of pump stations is studied.
    2.分析了水工泵站混凝土裂缝形成的主要原因,研究了水工泵站工程混凝土的开裂机理。
短句来源
    Based on the introduction of basic geological characteristics and relaxed-tension crack feature of a typical bank slope with relaxed-tension crack, the state and trend of bank slope stress are analyzed before and after tension crack formation as well as after water storage of the reservoir.
    在简述某典型卸荷拉裂岸坡基本地质特征及卸荷拉裂特征的基础上,通过三维有限元数值模拟,分析了拉裂缝形成前、后岸坡的应力状态,以及库区正常蓄水后岸坡应力场的发展趋势。
短句来源
  “裂缝形成”译为未确定词的双语例句
    Reasons causing the concrete crevices and the prevention measures
    论述混凝土裂缝形成的原因及防治措施
短句来源
    Physical experiments on the formation mechanism of the deep-seated fracture at abutment slope of a southwest hydropower station
    西南某电站岸坡深裂缝形成机制的物理模拟试验
短句来源
    Impact of Thermal Stress on Development and Extension of Surface Crack in Zhexi Buttress Dam
    温度应力对柘溪大头坝表面裂缝形成与发展的影响
短句来源
    (4) Deformation and stress evolution mechanism of gravity arch dams under the influence of geological defects is drawn out by the above numerical methods. And the rules how the strength, creep and seepage of geological defects influence on deformation and cracks evolution of the dams are derived.
    (4) 基于上述提出的分析模型,结合实际工程,通过数值模拟研究了缺陷体影响拱坝变形和应力演变的机理,探究了地质缺陷的强度、流变、渗流对拱坝变形演变和裂缝形成的影响规律。
短句来源
    In the end, after analyzing temperature control and slit data of high arch dam constructed in the world, according to sort of concrete dam slit and reason of it produces, the paper discuss temperature control criterion, some common temperature stress control and slit prevention measures at present are put forward.
    最后,论文通过对已建高混凝土拱坝温控与裂缝资料的分析,结合混凝土坝裂缝的分类及裂缝形成的主要原因,论述了温度控制标准,并提出了目前混凝土坝中通常采用的几种控制温度应力、防止裂缝的技术措施。
短句来源
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  crack formation
The design and results of the tests performed with this setup for AE-technique-based monitoring of the crack formation are presented.
      
Some estimates are obtained for the interaction between the acoustic emission pulses caused by the crack formation in the Arctic ice cover and a high-frequency test wave.
      
The high-frequency range (4-11 kHz) is most informative for the observation of geoacoustic noise caused by the crack formation processes.
      
It is proposed that h reflects not only the deformation heterogeneity, but also influences crack formation during the creep process.
      
In the limit, this condition coincides with the condition of crack formation at the tip of a single twin boundary with the same total number of dislocations.
      
更多          
  fracture formation
The benefit of this technique over traditional curvature analysis is that the structural evolution is taken into account, a factor that mostly dominates fracture formation.
      
Fractal and information characteristics of the stressed state of a massif and their effect on the process of fracture formation
      
Fracture formation and void filling of the first generation of neptunian dikes is dated as Pliensbachian and is interpreted to be caused by the Julian carbonate platform dissection due to widely recognized Lower Jurassic Tethyan rifting.
      
It is suggested that observed scale effects in JRC and joint dilation can be explained by small differential strain discontinuities across fractures, which originate at the time of fracture formation.
      
In this study acoustic emission (AE) techniques were employed to investigate the process of fracture formation in large, shear-critical, reinforced concrete beams and to gain improved insight into the mechanisms of shear failure.
      
更多          
  crack formation
The design and results of the tests performed with this setup for AE-technique-based monitoring of the crack formation are presented.
      
Some estimates are obtained for the interaction between the acoustic emission pulses caused by the crack formation in the Arctic ice cover and a high-frequency test wave.
      
The high-frequency range (4-11 kHz) is most informative for the observation of geoacoustic noise caused by the crack formation processes.
      
It is proposed that h reflects not only the deformation heterogeneity, but also influences crack formation during the creep process.
      
In the limit, this condition coincides with the condition of crack formation at the tip of a single twin boundary with the same total number of dislocations.
      
更多          


For the surveillance of dam safety,it is necessary to determine the exact young's modulus(E),linear dilatation coefficient((?))and fracture toughness of concrete in dam body. This article taking Fu Ziling Multiple-Arch Dam as an example introduces the calculations of these parameters. The Young's modulus of concrete is obtained from the water pressure component of horizontal displacement in dam crest in statistical model(ΔδH) and the same component calculated by FEM(Δδ'H): E_c=E_c′ΔδH'/ΔδH (1) here E_c′ is the...

For the surveillance of dam safety,it is necessary to determine the exact young's modulus(E),linear dilatation coefficient((?))and fracture toughness of concrete in dam body. This article taking Fu Ziling Multiple-Arch Dam as an example introduces the calculations of these parameters. The Young's modulus of concrete is obtained from the water pressure component of horizontal displacement in dam crest in statistical model(ΔδH) and the same component calculated by FEM(Δδ'H): E_c=E_c′ΔδH'/ΔδH (1) here E_c′ is the pre-assumed young′s modulus of dam concrete. The linear dilatation coefficient((?))is obtained from the thermal component of vertical displacement in dam crest in statistical model(ΔδT) and the same component calculated by FEM(ΔδT′): α=α′ΔδT/ΔδT′ (2) here α′is the pre-assumed linear dilatation coefficient of dam concrete. The governing condition of crack occurrence can be foundout from the analysis of measured data and the stress in dam under this condition can be calculated by FEM. The stress intensity factor of a certain crack developed under minimum stress condition is Considered approximately as the fracture toughness of dam concrete[K_c]: [K_c]=K_Ⅰcos~3 Q_o/2-3K Ⅱ sin Q_o/2 cos~2 Q_o/2 (3) here, K_Ⅰ and K_Ⅱ are stress intensity factors on the tips of type Ⅰ and type Ⅱ crack respectively, Q. is the direction angle of crack propagation. Applying above mentioned formulus to Fuziling Multiple Arch Dam, weget E_c=3×10~(5kg)/cm~2, α=0.8×10~(-5)/℃, [K_c]=110~(kg)/cm~2.

为了监视大坝的安全,需要进行有关方面的研究,如进行理论计算(有限元法、工程力学等)和模型试验,分析坝体与地基的应力、变形以及裂缝的形成条件等。这就需要确定坝体混凝土确切的弹性模量(E)、线膨胀系数(α)以及断裂韧度等。而设计时采用的混凝土力学参数,由于施工、混凝土分区以及老化与徐变等原因,往往与实际值出入较大。本文以佛子岭连拱坝为例,介绍用坝顶水平位移统计模型的水压力分量与有限元法计算的水压力分量,推求混凝土的弹模(E);用坝顶垂直位移统计模型的温度分量与有限单元法计算的垂直位移的温度分量,推求混凝土的线膨胀系数(α);由观测资料分析引出的裂缝产生的控制情况,用有限元法和断裂力学推求坝体混凝土的断裂韧度。

Combining the theory of damage mechanics with experiments,two damage model—bicurvlinear model and bilinear model are proposed. Calculations of typical examples show that the behaviour of concrete can be well described by these two models.Then the bicurvlinear model is extended to the problems which take the temperature effect into account and the surface crack forming in Zhexi diamond head buttress dam is calculated using this model and the finite element method.The results of calculation basically agree with...

Combining the theory of damage mechanics with experiments,two damage model—bicurvlinear model and bilinear model are proposed. Calculations of typical examples show that the behaviour of concrete can be well described by these two models.Then the bicurvlinear model is extended to the problems which take the temperature effect into account and the surface crack forming in Zhexi diamond head buttress dam is calculated using this model and the finite element method.The results of calculation basically agree with the actual state.

本文首先用损伤力学的理论和实验相结合的方法,提出了两种描述混凝土损伤演变的模型——分段曲线模型和双线性模型.算例表明,利用这两种模型均能较好地描述混凝土的损伤特性.本文又将分段曲线模型推广到考虑温度影响的问题.并利用此模型用有限元方法计算和分析了柘溪单支墩大头坝表面裂缝的形成,计算结果和大头坝实际情况基本相符.

The reservoir area of the Guanyinge Reservoir is located in severe cold zone. The climate is poor. There are 5 months in winter every year in which the concrete pouring could not be conducted. From February to April in1994, it was found in site that the horizontal construction joints opened in some dam sections, with the maximum joint depth is up to 3-6m. In order to study the fissure form process and its development trend and ensure that no fissure could be occurred in overwintering surface from now on, the...

The reservoir area of the Guanyinge Reservoir is located in severe cold zone. The climate is poor. There are 5 months in winter every year in which the concrete pouring could not be conducted. From February to April in1994, it was found in site that the horizontal construction joints opened in some dam sections, with the maximum joint depth is up to 3-6m. In order to study the fissure form process and its development trend and ensure that no fissure could be occurred in overwintering surface from now on, the finite element method has been used, in linewith actual field conditions, for the emulation analysis and prediction calculation analysis of temperature and creep stress by temperature for typical dam section of Guanyinge Dam during construction and operation have been studied.

观音阁水库库区地处严寒地带,气候条件恶劣,每年的冬季有5个月不能浇筑混凝土。1994年2~4月间,现场发现部分坝段越冬面上的水平施工缝张开,最大深度达(3~6)m。为研究裂缝的形成过程及发展趋势,确保今后越冬面不出现裂缝,用有限单元法对观音阁大坝的典型坝段按现场实际情况,进行了施工期至运行期的温度及温度徐变应力的仿真分析及预测计算分析,研究了避免新浇混凝土施工期及运行期产生裂缝的温控条件及措施。

 
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