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Steel fiber reinforced concrete with merits of reducing concrete cracking and improving structural toughness etc., has gradually been applied in tunnel lining support. However, the structural performance of steel fiber reinforced concrete greatly depends on the distribution of steel fibers in the concrete matrix significantly affected by the production process. Therefore, it is urgent to conduct research on the relationship between the steel fiber distribution and the production process. Starting from the actual project, six kinds of steel fiber reinforced concrete preparation technology were selected, and 18 beam specimens were poured to carry out the flexural performance test of steel fiber reinforced concrete. The test results show that the end hook steel fiber reinforced concrete prepared by MT1 has good performance in terms of damage location, steel fiber distribution, exposed angle, exposed length and bending strength. [ABSTRACT FROM AUTHOR]

Copyright of Tunnel Construction / Suidao Jianshe (Zhong-Yingwen Ban) is the property of Tunnel Construction Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Tunnel Construction / Suidao Jianshe (Zhong-Yingwen Ban) is the property of Tunnel Construction Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Southeast University / Dongnan Daxue Xuebao is the property of Journal of Southeast University Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

With the development of the country's large-scale infrastructure, the demand for underwater tunnel construction is increasing ； however, regarding the construction, operation and maintenance of underwater tunnel are more difficult, the tunnel durability needs to be concerned as well as the life-cycle design. This paper investigated the waterproof and durability measures of the Tokyo Bay Transverse Highway Tunnel, and proposed a comprehensive durability strategy of "multiple waterproof, multi-anticorrosion, and life-cycle design" for the construction of large diameter underwater tunnel. In addition, a life-cycle design method was established with the performance and cost as indicators, and was applied to evaluating of a submarine tunnel under four construction and maintenance plans. As the result, it was clarified that the plan of the high durable tunnel in the initial stage was the most beneficial, and the life-cycle design method was effective. Conclusively, the rational planning and design, scientific construction and maintenance of underwater tunnels could be foundationally supported by development of a life-cycle design system accounting for the economy, safety and environment. [ABSTRACT FROM AUTHOR]