... of time-delayed rockbursts does not reduce with the increase of their distance from explosive center; (2) the risk of the time-delayed rockburst in situations with several working faces is obviously higher than that with single tunnel face; (3) most of the time-delayed rockbursts occur within seven days...

...Rock Characterisation, Modelling and Engineering Design Methods Feng, Hudson & Tan (Eds) © 2013 Taylor & Francis Group, London, ISBN 978-1-138-00057-5 Measurement and real-time visual presentation of ground deformation ahead of mountain tunneling face using optical fibers S. Akutagawa, H. Zhang...

... during the construc- tion stage, with more geologic information updated gradually. Note that this paper focuses on the risk assessment during tunnel construction. 2.2 Division of excavated region behind tunnel face This means the excavated region behind tunnel face is divided into several sections along...

... stress state at vault with increase of distance from free face at the direction ofperpendiculartunnelaxes;thestressisfirstlyassembled,thenfallsdownsuddenlycloseto zero and finally increases to some value as observed profile is firstly close to and then far away from the tunnel face. The laws above...

... Reservoir Characterization Upstream Oil & Gas TBM diameter excavation process Midstream Oil & Gas tunnel face rock condition rock machine installation shield structural geology cylinder water pressure excavation inflow hard rock tbm tunnel Gripper TBM geological...