A Study of the Structure of Tori Arch Dam by Model Test (IV)

KYUTOKU Shigeo, NAKAZIMA Yasuzi, KAWAGUCHI Noritada, YAMASHITA Susumu, UEHARA Kenichi

doi:10.11408/jsidre1965.1966.16_26

In designing arch dams, the safety factor of each dam is generally given as the ratio of maximum stress acting on the dam to the strength of material.<BR>But an actual arch dam is an elastic, plastic and redundant structure, which will locally reach an elastic limit as load increases. Even if load increase still further, it will hold it by changing its whole resisting mechanism, until the structure will collapse when the whole structure loses stability and plastic joints are developed.<BR>Therefore, it is important that the safety factor of a dam is studied from the view point of the load resistance of its whole structure. The authors studied the safety factor of Tori arch dam by conducting a model test. The model were 1/100 as large as the prototype in a geometric scale and made of a mixture of plaster and diatmaceous earth.<BR>The similarity between the model and the prototype is shown in Table. The safety factor of the structure is difined to be the ratio of collapsing load and standard load (design load).<BR>Conclusion: The safety factors of the first and the final sections were 7.0 and 7.4 respectively. The process of the failure of the final section is as follws. Firstly, when oil pressure reached 149 kg/cm², a vertical crack appeared at the crown of the lower part of the dam body on the downstream side. Then, when load was kept increased, several diagonal cracks from the abutment to the crown occured above EL. 310m. Lastly, large vertical and horizontal cracks took place at the upper crown and near EL. 290 m, and developed until the model finally collapsed (see Figs. 41, 42).

A Study of the Structure of Tori Arch Dam by Model Test (IV)

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