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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.
Tuxi Hydropower Station was built in 1958, the dam height of 104 meters, the diamond-shaped single pier dams. In recent years, one or two dam sections of the head have cracks, causing all aspects of attention. Dam stability depends on whether the cracks continue to expand and what kind of safety reinforcement engineering measures.To this end, the three-dimensional photoelasticity research.This paper describes the use of photoelastic method to determine the stress intensity factor of the basic principles and test techniques, and put forward A general analytical method - isoparametric method for determining the mixed stress intensity factors K_1 and K_ (11) by photoelastic streak pattern is also used to study the open type and slip type of the Dakou dam in the Zhexi Hydropower Station The results show that eliminating the water pressure in the fracture is an effective way to maintain the fracture stability.It is worth noting that although the temporary measures of the concrete triangular plug are used, it is still not enough to prevent the further expansion of the fracture.