Abstract：
The selection of segment materials determines the segment performance and the overall safety and reli?
ability of the structure. Steel fiber reinforced concrete materials have better mechanical properties than that of normal concrete in terms of crack resistance, earthquake resistance, fatigue resistance and impact resistance. Therefore,based on the reliability theory, steel fiber is added into the concrete material to optimize the mix design, and a series of tests are carried out to study the reliability of steel fiber reinforced concrete segment aiming at the segment lining of the Shenzhen shield tunnel in marine strata. The results show that: (1) in the case without large deformation, the best scheme is to use steel fiber reinforced concrete segments with less reinforcement; (2) under the same reinforcement ratio, the steel fiber concrete segment with less reinforcement has higher reliability than that of the original
steel reinforced concrete segment, and it is affected by amounts of steel fiber admixture, varieties, shapes and aspect ratios; (3) steel fiber reinforced concrete segment can greatly improve the reliability of lining structure and meet the safety standard of metro tunnel structure durability in marine strata.
ZHENG Aiyuan1 XU Bin2 CHEN Xiangsheng1
.Study on Reliability of Steel Fiber Reinforced Concrete Segments of Metro in Marine Strata[J] MODERN TUNNELLING TECHNOLOGY, 2020,V57(4): 52-58
2020, Vol. 57 