Journal of Shandong University(Engineering Science) ›› 2020, Vol. 50 ›› Issue (5): 44-49.doi: 10.6040/j.issn.1672-3961.0.2020.085

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Application of pure steel fiber concrete segment in hard rock tunnel

XU Zhen1, LI Deming2*, WANG Bin1, ZHAN Guyi2, ZHANG Shijie2   

  1. 1. Qingdao Metro Line 1 Co., Ltd., Qingdao 266044, Shandong, China;
    2. China Railway Academy Co., Ltd., Chengdu 610032, Sichuan, China
  • Published:2020-10-19

Abstract: Based on the previous steel fiber reinforced concrete material property test and segment mechanical performance test, FLAC 3D was used to numerically simulate steel fiber reinforced concrete segments in hard rock tunnels, and field tests were conducted on Qingdao Metro Line 1 to test the segments. The results showed that the pure steel fiber reinforced concrete segment had better crack resistance than the ordinary segment, which could effectively reduce the cracks and about 60% edge loss and angle drop. Using pure steel fiber concrete segment could control the surface settlement, the convergence and the vault settlement more efficiently. Under normal conditions of hard rock tunnels, the segments were under full-section compression, and without configuring tensile steel, it was feasible to completely replace the steel bars by steel fiber.

Key words: TBM segment, steel fiber reinforced concrete, numerical analysis, field test, stress and settlement analysis

CLC Number: 

  • TU933.4
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