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http://dx.doi.org/10.9711/KTAJ.2020.22.4.367

A study of mixing ratio of seal material for umbrella arch reinforcement for tunnelling  

Hwang, Beoung-Hyeon (Dept. of Civil Engineering, Hoseo University)
Kim, Yeon-Deok (Dept. of Civil Engineering, Hoseo University)
Sim, Jae-Hoon (Design Team, Hyundai Engineering & Construction)
Kim, Sang-Hwan (Dept. of Civil Engineering, Hoseo University)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.22, no.4, 2020 , pp. 367-381 More about this Journal
Abstract
This paper presents the seal material mixing ratio of tunnel umbrella arch reinforcement method. Currently, there is no clear standard for the proper gelation time and curing time of the Seal material in Korea, and the quality control is also difficult because it cannot be verified. In response, the ratio of the mixture of the seal material was composed of four types of indoor experiments, and the amount of gelation time and bleed was checked. In addition, a non-cart penetration test confirmed the curing time and compared the ratio of each combination. Further experiments on W/C 120% identified the effect of mixing speed and time on the seal material. A total of three field experiments were conducted based on indoor experiments, and the size and strength of bulb formation were compared by checking the curing time of the specimen and main injection. Comparisons show that the lower W/C, the stronger the strength, the larger the size of the bulb, and the faster the hardening time appears. Based on the results of the gelation time and curing time, it was deemed that the mixing ratio of W/C 120% is most appropriate when applied to the actual site.
Keywords
Seal material; Umbrella arch reinforcement method; Mixing ratio; Gelation time; Bleeding;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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