Tehnički vjesnik, Vol. 23 No. 3, 2016.
Izvorni znanstveni članak
https://doi.org/10.17559/TV-20151217142924
Skewed pressure characteristics induced by step-by-step excavation of a double-arch tunnel based on infrared thermography
Shu-ren Wang
orcid.org/0000-0001-5490-2825
; (1) School of Civil Engineering and Mechanics, Yanshan University, No. 438 Hebei West Street, Haigang District, Qinhuangdao, 066004, China; (2) Opening Laboratory for Deep Mine Construction, Henan Polytechnic University, 2001 Century Avenue, Jiaozuo, Hena
Chun-liu Li
; (1) School of Civil Engineering and Mechanics, Yanshan University, No. 438 Hebei West Street, Haigang District, Qinhuangdao, 066004, China; (2) Institute of Urban Construction, Hebei Normal University of Science & Technology, No. 360 Hebei West Street, Ha
De-jian Li
; State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Ding No. 11 Xueyuan Road, Haidian District, Beijing 100083, China
Yan-bo Zhang
; College of Mining Engineering, North China University of Science and Technology, No. 46 Xinhua West Road, Tangshan, 063009, China
Paul Hagan
orcid.org/0000-0003-4011-2771
; School of Mining Engineering, University of New South Wales, Gate 14, Barker Street, Sydney, 2052, Australia
Sažetak
In order to obtain the skewed pressure characteristics, the physical model tests, adopting two kinds of excavation sequences of the bench method and the expanding method, were conducted under the different confining pressures for observation thermal radiation characteristics of the skewed pressure induced by step-by-step excavation for a double-arch tunnel. Firstly, under uniaxial compression test, the cylindrical specimen presented the cooling effect, the correlations between the axial stress of the cylindrical specimen and its surface thermal radiation temperature displayed negative nonlinear correlation in the pre-peak curve and linear correlation in the post-peak curve, respectively. Secondly, for the physical model tests, the stress-temperature-time curves showed obvious two-phase trend as first moderate decline and then rapid decline stages, and the latter was slower than the former for an excavation step after all excavations being completed. The results showed that for two different excavation sequences, the failure positions on the vault of the double-arch tunnel due to being unloaded are diametrically opposed. Then the corresponding relationships between the skewed pressure induced by double-arch tunnel excavation and the temperature field of the infrared thermal radiation were revealed, which can provide a reference for the reasonable excavation and security support of the double-arch tunnel.
Ključne riječi
double-arch tunnel; excavation; infrared radiation; physical model; skewed pressure
Hrčak ID:
160143
URI
Datum izdavanja:
19.6.2016.
Posjeta: 2.343 *