Methods of Remining Tunnel TO8 at THSRC Contract C230 after a Collapse

摘要

Of the 345 km long Taiwan High Speed Rail Project, connecting the cities of Taipei and Kaohsiung,rnthe 23 km alignment on Contract C230 included the construction of 5755 m of shallow mined tunnelsrnranging from 137 m to 1285 m in length. These nine tunnels were mined using NATM methodology.rnOn September 6, 2002, a collapse occurred in Tunnel T08 that affected approximately 50 m of tunnel.rnThere was little warning. However, the crew was evacuated approximately 45 minutes prior to failurernand thus, no injuries or loss of equipment. This paper will discuss the mining methods, jet groutingrnground support, and the instrumentation selected for the rehabilitation of the tunnel after the collapse.