Abstract:

During the construction of low and intermediate level radioactive waste repository in Bátaapáti, various geotechnical data were collected. The tunnel faces were documented continuously using different rock mass classification systems for determining the excavation support system. The aim of this paper is to compare the three broadly used rock engineering parameters, namely RMR, Q and GSI values. The same types of equations were gained as those published by previous researchers but with different constants. The geotechnical background of the area including the underground cavern system is very complex. At the beginning we were using the RMR and Q systems to describe the rock mass properties, while the rock support system was based on Q system. Later, during the construction of the repository chamber, the GSI system was introduced besides the above mentioned rock classification methods. To provide a higher level of accuracy during tunnel mapping and documentation, special methods based on photogrammetry and analyzer software programmes were used in each case. According to the results, correlation between RMR and Q values is independent of the rock types: basically the same equation can be used for both of them (differences between statistical errors). The GSI intervals also follow the trend as closely as the results derived from the other two methods.

1 INTRODUCTION

The program for the final disposal of low and intermediate level radioactive waste coming from Paks Nuclear Power Plant has been in progress for many years in Hungary. Preparation for final disposal of radioactive wastes has been done as part of a national program since 1993. The Central Nuclear Financial Found and the Public Agency of Radioactive Waste (Puram) have been established to coordinate organizations and activities for all tasks in connection with nuclear waste treatment.

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