ティートンダムの欠壊に関する考察

Abstract

Recent disastrous failure of Teton dam created big reverberation in the world and has given many significant precepts for dam engineers. In order not to give rise such an unfortunate accident again, engineers should make efforts to conduct close examination of possible aspects that could have contributed to the failure and to make the best use of their findings for future activities of design and construction. The authors have had an oppotunity to visit and inspect the damsite in Oct., 1976 as member of the investigation party organized by the Governor of Gifu prefecture. This paper was made as a report of the authors' findings on the cause of the Teton dam failure and submitted in Dec., 1976 to Gifu prefecture. The present investigation is based on some contributed materials and analytical studies by the finite element method, and discussions are given principally on the possibility of crack generation and the hydraulic fracturing potential of the dam. As one of investigation groups in U. S. A. reached final conclusion recently, (its view on the cause of the failure is also presented in this paper.