Abstract:

 Excavating a largesection tunnel in the upper soft and lower hard stratum needs to adopt appropriate construction program, because traditional excavation methods may not meet the request of safety, cost and working progress. The finite element software ANSYS10.0 and the monitoring data are used to analyze the construction method of the largesection tunnels in the stratum with upper soft and lower hard layers in this paper. Through comparing the results from various construction methods, some parameters are presented which can be used in other constructions in the similar stratum.

Key words: upper soft and lower hard stratum  , CRD  , bench cut and crown drift method largesection tunnel  , numerical simulation