scholarly journals Discussion on the Large Deformation Law of Muzhailing Tunnel in Lanhai Expressway

2017 ◽  
Vol 6 (2) ◽  
Author(s):  
Xi Cheng
Keyword(s):  
Tibetan Plateau ◽  
Large Deformation ◽  
The Tibetan Plateau ◽  
Deformation Law ◽  
Initial Support ◽  
Ground Stress ◽  
The Law

Muzhailing tunnel is a key project of Weiwu section Lanhai Expressway. It is located in the northeastern margin of the Tibetan Plateau. The complex geological enviorments, such as high ground stress, large buried-depth, fault and fold development, soft and fragmented rock, leads to poor self-stabilizing ability. 2# inclined shaft of Muzhailing tunnel is the main object we studied in this paper. During the construction of the tunnel, large deformation, spalling and fall-block occured on the initial support. The accumulated dome sinking vale and peripheral convergence value are large, mainly presented by the vault sinking, wall squeezing, shotcrete spalling, fall-block, and steel arch twisting and so on. In this paper, the law of large deformation of the tunnel is discussed.

scholarly journals Optimization and Application of Support Scheme for Tunnel with High In-situ Stress in Ningchan

2021 ◽  
Vol 248 ◽  
pp. 03004
Author(s):  
Zhang Xueqiang
Keyword(s):  
Large Deformation ◽  
Double Layer ◽  
Optimization Design ◽  
High Stress ◽  
Tunnel Support ◽  
Stability Period ◽  
Deformation Stability ◽  
Initial Support ◽  
Ground Stress ◽  
Cumulative Deformation

Based on the national highway 569 Mandala Datong highway Ningchan tunnel, the study on the optimization design of high ground stress tunnel support parameters is carried out. The results show that the single-layer primary support with I20b as the main support framework cannot control the large deformation of high ground stress tunnel, mainly manifested as arch frame failure and concrete spalling; adopting “double-layer initial support” can control large deformation to a certain extent; increasing the stiffness of inner layer support can reduce the “double-layer” to a certain extent The results show that the cumulative deformation of “support”, but cannot significantly shorten the deformation stability period; appropriately increasing the reserved deformation between the inner and outer layers of the initial support has the best supporting effect, the cumulative deformation is small, and the deformation stability period is shortened. The research results provide a basis for similar high stress tunnel support measures.

Warming patterns over the Tibetan Plateau and adjacent lowlands derived from elevation- and bias‑corrected ERA-Interim data

2014 ◽  
Vol 58 (3) ◽  
pp. 235-246 ◽  
Author(s):  
L Gerlitz ◽  
O Conrad ◽  
A Thomas ◽  
J Böhner
Keyword(s):  
Tibetan Plateau ◽  
The Tibetan Plateau
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