open access

https://hdl.handle.net/2115/53014

Study on Deformation Characteristics of Young-Age Tunnel Shotcrete

日本語

応力緩和

2012-02-25

資源・素材学会

Journal of MMIJ : journal of the Mining and Materials Processing Institute of Japan

128(3)

113-120

Uniaxial compression tests and multi-stage stress relaxation tests for specially prepared young-age tunnel shotcrete were carried out. Comparing to previous studies, clip gauges were determined to be the best to evaluate elastic moduli of young-age tunnel shotcrete. Uniaxial compressive strength and 33% secant modulus were larger than those of base concrete till 1 day, however, they became less than those of base concrete after then. Uniaxial compressive strength and 33% secant modulus till 1day showed a linear relationship. This means that 33% secant modulus could be determined from uniaxial compressive strength which is routinely determined at tunnel construction sites. In the multi-stage stress relaxation test, displacing rate significantly affected 33% secant modulus. This will result in significant change in support response to rock mass deformation. Stress decrease by yielding and stress increase with curing time even after the yielding were observed for slow loading multi-stage tests. The above findings will help to design reasonable tunnel supports through precise stress analyses around tunnel faces.

学術雑誌論文

Version of Record

1881-6118

AA12188381