Analysis of cycle excavation and productivity of large-scale rock tunnel projects - lesson learned in Taiwan

Abstract

Tunnel construction has become a major part of infrastructure development in Taiwan in the 1990s. This study compares and analyzes the productivity difference in the construction of two large-scale long rock tunnels, i.e., the Pengshan and Nangkang No. 2 tunnels. These two tunnels, which are 3.8 and 2.7 km in length, respectively, are part of the Taipei-Ilan Expressway. The cross section, construction method, and contract type are all similar. Both projects utilized multi-skilled working crews for improving productivity. However, essential differences in productivity and monthly progress were recorded. This study analyzes the key factors for these differences regarding the geological condition, working crews, equipment and facilities, and management approach. Based on the productivity data analysis of the two tunnels, the key points for productivity improvement of large-scale rock tunnel projects are then pinpointed.Key words: cycle excavation, productivity, rock tunnel, Taiwan.