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地震滑坡涌浪下的混凝土重力坝破坏研究

发布时间:2019-01-12 16:44
【摘要】:在我国西南地区,由于地质条件复杂,在库区存在许多大的潜在滑坡体。这些潜在滑坡体在水库建成后,由于水位的抬升及水库运行效应的影响,长期处于干湿交替状态,抗滑稳定性下降,在地震、暴雨或水位快速变动等情况下可能导致大规模滑坡体失稳滑入水库。这些滑坡体一旦失稳,将会影响水库的安全运行,而且其激起的涌浪将会对坝体造成强烈冲击,出现溃坝或者涌浪漫过大坝的危险情况,影响滑坡发生区附近和下游人民生命财产的安全。 目前的大坝,都是按静力载荷及地震动载荷设计的。对于大坝抵抗涌浪冲击的能力一般不予考虑,因为有关的计算非常复杂,有关的理论不完善。涌浪的高水头冲击压力与地震动作用的不同组合将会额外增大高坝破坏的风险。为了探讨地震滑坡涌浪下的混凝土重力坝损伤破坏情况,本文主要进行了以下三方面工作: (1)本文关心的是坝体的损伤破坏情况,假定坝体建在刚性地基上,不考虑地基-坝体的相互影响。分析选取了较为合理经试验验证的涌浪压力模式,坝体材料采用混凝土的塑性损伤本构模型,选取了Koyna坝体断面为计算对象,建立计算模型。 (2)滑坡涌浪可能发生在震前震后甚至地震动中间的任何时刻与地震动作用叠加增大对坝体的影响,本文针对不同地震动峰值和不同涌浪高度下坝体在这些组合时刻的响应进行了计算分析。 (3)进行了震后坝体的涌浪超载分析和有无涌浪时坝体地震超载分析。
[Abstract]:There are many large potential landslide bodies in the reservoir area because of the complex geological conditions in southwest China. After the completion of the reservoir, these potential landslide bodies, due to the uplift of the water level and the effect of the reservoir operation effect, are in a long period of dry and wet alternating state, and the stability of the anti-slide is decreased, and the stability of the landslide is decreased in the earthquake. Heavy rain or rapid change of water level may lead to large-scale landslide sliding into the reservoir. Once the landslide is unstable, it will affect the safe operation of the reservoir, and the surge caused by the landslide will have a strong impact on the dam body, resulting in the danger of dam break or romantic surges over the dam. Affect the safety of life and property of people near and downstream of landslide occurrence area. At present, dams are designed according to static load and ground motion load. The ability of dam to resist surge is generally not considered because the calculation is very complicated and the theory is not perfect. Different combinations of high head impact pressure and ground motion will increase the risk of high dam failure. In order to discuss the damage and failure of concrete gravity dam under earthquake landslide surge wave, this paper mainly carried out the following three aspects of work: (1) this paper is concerned with the damage and failure of the dam body, assuming that the dam body is built on rigid foundation. The interaction between foundation and dam is not considered. The reasonable surge pressure model verified by test is selected. The plastic damage constitutive model of concrete is used in dam material. The section of Koyna dam is selected as the calculating object and the calculation model is established. (2) the influence of landslide surge on dam body may occur at any time before earthquake or even in the middle of ground motion. In this paper, the responses of dam body at these combined times under different peak ground motion and different surge height are calculated and analyzed. (3) the wave overloading analysis of the dam body after the earthquake and the seismic overload analysis of the dam body with or without surge waves are carried out.
【学位授予单位】:大连理工大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:TV642.3;TV313

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