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首页> 外文会议>New Development in Rock Mechanics Rock Engineering >APPLICATION OF DAMAGE INDICES FOR SEISMIC SAFETY ASSEEMENT OF ARCH DAMS AGAINST SLIDING AND OPENING FAILURE IN JOINTED ROCK MASS AT ABUTMENT
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APPLICATION OF DAMAGE INDICES FOR SEISMIC SAFETY ASSEEMENT OF ARCH DAMS AGAINST SLIDING AND OPENING FAILURE IN JOINTED ROCK MASS AT ABUTMENT

机译：损伤指数在拱坝节理岩体滑移，开裂破坏中拱坝地震安全性评估中的应用

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摘要

One of the serious concerns of the engineers involved in the dam design for the areas of highly seismicity is the safety evaluation of dams against large earthquakes. In the case of concrete arch dams, which are often unavoidable to place them on a rock foundation consisting of joints, sliding and opening of rock joints at abutment are two possible failure mechanisms, which may lead to collapse of the dam or release of the reservoir under earthquake excitation. Based on these mechanisms, a method for the safety assessment of concrete arch dams against large earthquakes is presented. In this method using the results of three-dimensional dynamic analysis of the dam and foundation, a two-dimensional local analysis is carried out on critical regions of abutment. In the local analysis, which covers a large 2-D domain around the dam body at a critical elevation of abutment, the rock joints are modeled by interface elements. By this analysis, sliding and opening of rock joints can be obtained as a function of time. A shear softening constitutive law with a hyperbolic form is applied on the behavior of joints in sliding and also an artificial hyperbolic tensile softening has been used for the joints behavior in opening. In this paper, two kinds of damage indices, which are applied for both failure mechanisms of sliding, or opening, are introduced to indicate the failure progress of abutment at each time of earthquake excitation. The maximum value of each damage index during the earthquake loading is plotted against peak ground acceleration after doing several dynamic analysis of the 2-D model under earthquake motions with the same waveform and different amplification. Using these curves, the dominant failure mechanism of abutment as well as the magnitude of critical earthquake in which the abutment ruptures will be obtained and from that the seismic safety of arch dam against a specified earthquake can be estimated.
机译：大坝设计工程师对高地震活动性的严重关切之一是大坝对大地震的安全性评估。对于混凝土拱坝，通常不可避免的是将它们放置在由节理组成的岩石基础上，在邻接处滑动和打开节理是两种可能的破坏机制，这可能导致大坝倒塌或水库释放。在地震激发下。基于这些机理，提出了一种混凝土拱坝大地震安全性评估方法。在此方法中，使用大坝和基础的三维动态分析结果，对桥台的关键区域进行了二维局部分析。在局部分析中，它在桥墩的临界高度覆盖了坝体周围的一个大二维区域，用接口元素对岩石节进行了建模。通过这种分析，可以得到岩石节理的滑动和张开随时间的变化。具有双曲线形式的剪切软化本构律适用于滑动中的关节行为，并且人工双曲线拉伸软化也已用于开放中的关节行为。本文介绍了两种破坏指标，分别适用于滑动或打开的两种破坏机理，以指示每次地震激发时基台的破坏进度。在对具有相同波形和不同放大率的地震运动下的二维模型进行几次动态分析后，将地震荷载期间每个破坏指数的最大值与地面加速度峰值作图。使用这些曲线，可以得出基台的主要破坏机理，以及获得基台破裂的临界地震的强度，从而可以估算出拱坝对特定地震的地震安全性。

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