JOURNAL OF ROCK MECHANICS

JOURNAL OF ROCK MECHANICS

Increasing the energy absorption of tunnel lining sections by using High Deformable Concrete elements in squeezing environments

Document Type : Original Article

Authors
Yaser Alilou Kesejini
Hasan Afshin
Mehrdad Emami Tabrizi
Amir Bahramifar
Dept. Civil Engineering, Sahand University of Technology, Iran.
Abstract
Squeezing ground condition is one of the most common challenges in construction of tunnels. Weak rock mass or high subjected stresses leads to squeezing phenomena in tunnels. One of the practical solutions for reducing the stresses in lining of the tunnels is implementing High Deformable Concrete (HDC) elements as deformable fuses to absorb the induced energy. Using HDC with equal compressive strength but more deformability and compressive strain (about 20 to 50 percent) than the conventional concrete leads to increasing the flexibility and energy absorption of tunnel sections A large number of studies has been carried out on improving ductility of concrete but because of commercial and exclusive benefits the details has not been published. In this paper with manufacturing HDC elements and obtaining the stress- strain compressive behavior in lab, we have studied the effect of HDC elements in flexibility of lining of tunnels. The results show the effective performance of the HDC elements in increasing energy absorption amount and flexibility of sections of the tunnel lining.
Keywords
Energy absorption
High deformable concrete (HDC)
Tunnel
Squeezing environments
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JOURNAL OF ROCK MECHANICS
Volume 1, Issue 4
Winter 2016
Pages 75-84