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A platform for research: civil engineering, architecture and urbanism
Seismic Response of Large Span Shallow Tunnels in Dilative Rocks
Seismic response induced by earthquakes is investigated using finite differential code for large span shallow tunnels. The mechanical behavior of weak rock is studied considering the influences of stress dilatancy on the failure mechanisms. Quasi-static representation of earthquake using a seismic coefficient concept is adopted for seismic estimations. The numerical results are presented. The results show that the dilatancy angle has great influences on the rock displacement and the failure face shape for the shallow tunnels, and that break angle deduced by earthquake force becomes larger. The failure face forms and extends to the ground surface with nonassocated flow rule. With the dilatancy angle increasing, the loose region decreases gradually. With the seismic coefficient increasing, loose region is distributed in a lager range. Therefore, the influence of nonassociated flow rule should be considered for determining the failure mechanisms of shallow tunnels subjected to earthquake force.
Seismic Response of Large Span Shallow Tunnels in Dilative Rocks
Seismic response induced by earthquakes is investigated using finite differential code for large span shallow tunnels. The mechanical behavior of weak rock is studied considering the influences of stress dilatancy on the failure mechanisms. Quasi-static representation of earthquake using a seismic coefficient concept is adopted for seismic estimations. The numerical results are presented. The results show that the dilatancy angle has great influences on the rock displacement and the failure face shape for the shallow tunnels, and that break angle deduced by earthquake force becomes larger. The failure face forms and extends to the ground surface with nonassocated flow rule. With the dilatancy angle increasing, the loose region decreases gradually. With the seismic coefficient increasing, loose region is distributed in a lager range. Therefore, the influence of nonassociated flow rule should be considered for determining the failure mechanisms of shallow tunnels subjected to earthquake force.
Seismic Response of Large Span Shallow Tunnels in Dilative Rocks
Yang, Xiao-Li (author) / Huang, Bo (author)
GeoShanghai International Conference 2010 ; 2010 ; Shanghai, China
Deep and Underground Excavations ; 274-279
2010-05-14
Conference paper
Electronic Resource
English
Seismic Response of Large Span Shallow Tunnels in Dilative Rocks
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