Surface lining system is one of the water-proof methods for dam and reservoirs. Recently, some new Geomembranes (GMs) with various performances have been introduced into this system. However, the methods of performance tests, design and construction for the commercial GMs have not been established yet as well as those of the newly developed GMs. Then, the following technical subjects are discussed in this paper:
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.
A leakage of water in concrete waterway is a serious problem for a waterway administrator, and its radical solution is being searched for. However, the present situation is that no fully satisfactory method has been yet. So, we have newly developed a surface repairing method to prevent a leakage by installing a flexible geomembrane on the wall of the waterway made of concrete blocks, and to lead rear water (arising from the concrete blocks joints) into the waterway smoothly not by fixing geomembrane on the whole surfaces but by dispersing geomembrane, and by using a back flow checking valve on the bottom. In this paper, the outline of the experimental construction conducted with this geomembrane in a waterway in the Kinki Region was described.
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