关键词: 隧道, 矿山法, 衬砌, 钢纤维混凝土, 聚丙烯纤维混凝土, 标准配比, 低发热配比, 高流动性配比, 纤维混入率

Abstract:

The reinforced concrete will be replaced by fiber concrete lining in other countries. The testing group method, loading method and testing results of load bearing property of fiber concreter of steel fiber concrete, polypropylene fiber concrete and plain concrete used in Japan are introduced. The mixing proportion test of nonreinforced concrete (PP, PVA and PET) used in Japan is introduced by means of different fiber mixing ratios and different mixing groups. The compressive strength of highfluidity mixing proportioned sample is the highest, followed by that of standard sample, and that of lowheat mixing proportioned sample is the lowest. The bending toughnesses of every sample are the same. The bending toughness can be improved by increasing the fiber mixing ratio. The keys of fiber concrete construction management are introduced. It is proposed that the fiber concrete lining is a rational and feasible choice in expansive rocks, squeezing rocks and sandsoil rocks. There are still many points of fiber concrete lining should be studied, such as type selection, determination fiber mixing ratio and quality control. The author suggests that field tests will be the best choice.

Key words: tunneling, mining method, lining, steel fiber concrete, polypropylene fiber concrete, standardized mixing proportion, lowheat mixing proportion, highfluidity mixing proportion, fiber mixing ratio