Geologic Factors in Rapid Excavation with Nuclear Explosives

2015 ◽  
pp. 17-25
Author(s):  
Richard Hamburger
Keyword(s):  
Rapid Excavation

Rapid excavation for small section tunnel using TBM

2017 ◽  
pp. 577-582
Author(s):  
H. Namura ◽  
H. Imaoka ◽  
T. Takamichi ◽  
Y. Kobayashi
Keyword(s):  
Small Section ◽  
Rapid Excavation

Large Extrusion Deflection Control Technology for Tunnel in Active Fault Zone

2011 ◽  
Vol 90-93 ◽  
pp. 1824-1827
Author(s):  
Su Min Zhang ◽  
Yong Quan Zhu ◽  
Zhi Chun Liu
Keyword(s):  
Large Scale ◽  
Large Deflection ◽  
Active Fault ◽  
In Situ Experiments ◽  
Lining Structure ◽  
High Geostress ◽  
Multiple Support ◽  
Boulder Clay ◽  
Rapid Excavation ◽  
Composite Lining

The Wushaoling tunnel passes the active engineering fault 7(simply called F7 below), where the surrounding rock is broken, mainly composed of fault boulder clay and rubble with very low strength/geostress ratio, resulting in remarkable deflection. Measures have been taken to control the large deflection of the primary support effectively and to ensure safety of the lining structure so that the F7 can be passed as early as possible . Two small-section roundabout drifts for left and right line each, affected less by the high geostress, are excavated in order to continue the construction ahead, to release partial geostress and to conduct experimental study guiding the design &construction of the main tunnels. At the same time, in-situ experiments are carried on against different pattern and parameters of support structure. Based on the above study, the measures are finally determined such as adopting circular multiple-support composite lining, setting deformation joints per segment to absorb the movement of the active fault, adhering the construction principle of “rapid excavation, rapid support, rapid closure and timely lining”, etc. As a result, the large deflection is controlled effectively in subsequent construction and the large-scale active fault rarely encountered domestic and abroad has been passed successively.

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