Abstract
It is important to examine the performance of Geomembranes (GMs) used for the surface lining system of reservoirs in the actual site condition constructed as a water-proof system, and to evaluate it under the operated condition. In this paper, each technical problem of the following three case studies into which GMs were used on a large scale was discussed. A regulating reservoir in Hokkaido was a case where GMs were applied to the reservoir in the cold region, and it was a main subject to clarify the temperature dependency of dynamic physical properties of GMs. B regulating reservoir in Aichi Pref. was a case where GMs were applied to the reservoir of high depth, and it was a main subject to evaluate the water-proof pressure of GMs to select thickness. C regulating reservoir in Okinawa Pref. was a reservoir located in the high temperature high humidity region, and it was a main subject to evaluate the influence which the site weather condition gave to dynamic stability of the site bonding parts of GMs. In addition, the durability evaluation of GMs was a common subject, and the deterioration characteristic of passing year of the real ageing of GMs was clarified by the sample collection from the test pond which had been used for 30 years.
