Journal of Jishou University(Natural Sciences Edition) ›› 2025, Vol. 46 ›› Issue (1): 65-69.DOI: 10.13438/j.cnki.jdzk.2025.01.010

• Transportation • Previous Articles     Next Articles

Numerical Analysis on Working Performance of Composite Support with Bolt-Shotcrete and Reinforced Rib Under High Geostress

LIAO Zhihe,QIN Weixing,HE Lijie,DAI Yu,HU Wei,YAO Di   

  1. (1.School of Hydraulic and Environmental Engineering,Changsha University of Science & Technology,Changsha 410114,China;2.Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province,Changsha 410114,China)
  • Online:2025-01-01 Published:2025-01-20

Abstract: In order to reveal the joint bearing mechanism and working performance of shotcrete liner,radial bolt and reinforced rib in the composite structure under high geostress,the mechanical response of the composite support in a soft tunnel with a geostress of 30 MPa was conducted based on the finite difference method which can consider the broken failure effect of bolt.The simulation results show that the composite support can effectively restrict the deformation of weak surrounding rock and has good overall stability under high geostress,but the radial bolts are broke at the top of the tunnel,and continuous plastic yield zone appears in the shotcrete liner and reinforced rib on both sides of the tunnel walls.It is recommended to appropriately increase the strength parameters of the bolts and the concrete on both sides when designing the composite support with bolt-shotcrete and reinforced rib for weak rock masses under high geostress.

Key words: reinforced ribs of shotcrete, bolt-shotcrete, working performance, high geostress

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