dc.description.abstract | After the 921 Chi-Chi Earthquake, many tunnels in Taiwan suffered damages.
Besides damages in the portal portion, the inner lining also suffered damages that
occurred in the portion with higher overburden which usually gives no damages in
accordance with past experiences. It has no seismic design and also has no
seismic code to be abided by. Taiwan is an earthquake-prone country and many
tunnels stretch a few hundred kilometers long. Therefore, the study on the
earthquake resistant analyses and designs of rock tunnels has became increasing
important.
This projet is 2-year long.The work scope for the first year include the
collection of local and overseas rock tunnel failure cases due to earthquakes, the
analysis of the various factors causing the earthquake effects, rock tunnel failure
mode during earthquake and its mechanisms, evaluation of the suitability and
limitations of the use of soil tunnel seismic resistant design specifications to rock
tunnel design, establishment of appropriate analysis model,preliminary analysis of
tunnel’s behavior with different overburden during earthquake, preliminary
analysis of influence of interaction between lining and surrounding rock on rock
tunnel. Besides continuing analysis work of tunnel behavior with different
overburden during earthquake and influence of interaction between lining and
surrounding rock on rock tunnel, the work scope for the second year include
influence of distance between weakness zone and tunnel ,study on behavior of
primary and secondary lining during earthquake ,topographic
effect ,characterestics of wave transmission for equivalent jointed rock mass,case
studies and comparison with analysis results,suggestion for analysis and design
for rock tunnel seismic resistant design.
This report is submitted as mid–term report for the first year
job(2003/8~2004/7). | en |