Transportation Research Congress 2016
Experiment Study on Tunnel Crown Collapse and the Bolt Anchoring Effect in Weak and Broken Rock Mass
Publication: Transportation Research Congress 2016: Innovations in Transportation Research Infrastructure
ABSTRACT
Tunneling in weak and broken rock mass will inevitably disturb surrounding rock mass, which results in instability failure due to the excessive deformation or the high stress generated in rock mass. Therefore, anchor bolts are always used as early support in practical engineering. In this paper, the weak and broken rock mass of grade IV according to Chinese codes is taken as the reference prototype. Subsequently, the trapdoor model test was carried out to simulate tunnel excavation in such type of rock mass, for the purpose of studying the progressive failure characteristics, the failure mode, and the bolt anchoring effect. The test results show that tunneling will inevitably form a disturbed zone around the tunnel, but only part of the rock mass in this zone collapses into tunnel arch shape. Secondly, due the support effect of bolt, the rock mass above tunnel crown presents the trend of damaging in partition. Thirdly, the damage zone mainly concentrated in a fan-shaped region, and the angle between this zone boundary and the horizontal plane is about 45°+ϕ/2. Finally, after the tunnel excavation, an arch-shaped bearing belt with high tangential stress will appear in the rock mass, about 1.0 to 1.25 B away from the tunnel crown.
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ACKNOWLEDGMENTS
The authors appreciate the support of the Natural Science Foundation of P.R. China (No. 41130751, No. 51174197) and Research Program for Development of Western China Communication (2011ZB04).
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Published In
Transportation Research Congress 2016: Innovations in Transportation Research Infrastructure
Pages: 430 - 437
Editors: Linbing Wang, Ph.D., Virginia Polytechnic University, Jianming Ling, Ph.D., Tongji University, Pan Liu, Ph.D., Southeast University, Hehua Zhu, Tongji University, Hongren Gong, University of Tennessee Knoxville, and Baoshan Huang, Ph.D., University of Tennessee Knoxville
ISBN (Online): 978-0-7844-8124-0
Copyright
© 2018 American Society of Civil Engineers.
History
Published online: Feb 6, 2018
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