Prediction of rock mass along tunnels by geostatistics

A study is made on the applicability and limitation of geostatistical methods in predicting rock mass quality along tunnel alignments based on investigation drillhole data. Two projects were used as the case study: - Lam Ta Khong Pumped Storage Project for a simple geologic setting and Klong Tha Dan Dam Project for a complex geologic setting. The study showed that the estimated rock mass quality and distribution was reasonably comparable with the field observation value for the case of Lam Ta Khong project but it was not the case for Klong Tha Dan Dam site.