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MODERN TUNNELLING TECHNOLOGY 2023, Vol. 60 Issue (6) :130-138    DOI:
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Study on the Impact of the Number of Cracks on Tunnel Lining Stability
(School of Highway, Chang'an University, Xi'an 710064)
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Abstract In order to investigate the mechanism by which the number of cracks affects the load-bearing perfor? mance and safety of tunnel lining structure, the cracked lining internal force calculation model has been created based on the theory of fracture mechanics, the stress intensity factor calculation formula for the double-crack scenario has been deduced, and the variation pattern of the internal force and stability factor of cracked lining structure, the way the number of cracks affects the internal force of lining structure and the variation of tensile stress at the crack have been analyzed. The results indicate: compared with the crown with 1 crack, the bearing capacity is reduced by only 1.35% and stability factor reduced by 6.9% when there are 2 cracks; the bearing capacity is reduced by 2.26% and stability factor reduced by 8.1% when there are 3 cracks. Where there are multiple adjacent cracks at the crown, one crack can, to certain extent, close the other cracks and will not accelerate crack propagation.
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HU Taotao HU Xiong JIA Ke
Keywords： Secondary lining   number of cracks   Stress intensity factor   Fracture mechanics   Stability factor     
Abstract： In order to investigate the mechanism by which the number of cracks affects the load-bearing perfor? mance and safety of tunnel lining structure, the cracked lining internal force calculation model has been created based on the theory of fracture mechanics, the stress intensity factor calculation formula for the double-crack scenario has been deduced, and the variation pattern of the internal force and stability factor of cracked lining structure, the way the number of cracks affects the internal force of lining structure and the variation of tensile stress at the crack have been analyzed. The results indicate: compared with the crown with 1 crack, the bearing capacity is reduced by only 1.35% and stability factor reduced by 6.9% when there are 2 cracks; the bearing capacity is reduced by 2.26% and stability factor reduced by 8.1% when there are 3 cracks. Where there are multiple adjacent cracks at the crown, one crack can, to certain extent, close the other cracks and will not accelerate crack propagation.
Keywords： Secondary lining,   number of cracks,   Stress intensity factor,   Fracture mechanics,   Stability factor     
Cite this article:   
HU Taotao HU Xiong JIA Ke .Study on the Impact of the Number of Cracks on Tunnel Lining Stability[J]  MODERN TUNNELLING TECHNOLOGY, 2023,V60(6): 130-138
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