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A Study on Development of the Controlled Low-Strength and High-Flowable Filling Material and Application of the Backfilling in Cavities behind the Old Tunnel Lining  

Ma, Sang-Joon (한국건설기술연구원)
Seo, Kyoung-Won (한국건설기술연구원)
Bae, Gyu-Jin (한국건설기술연구원)
Ahn, Sang-Cheol (한국건설기술연구원)
Lim, Kyung-Ha (리폼시스템 기술연구소)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.6, no.3, 2002 , pp. 177-184 More about this Journal
Abstract
The most tunnel damage such as cracks or leakage which exist in tunnel lining commonly, is caused by the cavities where exist behind the tunnel lining, through the tunnel safety inspections. These cavities were analysed to affect a stability of a running-tunnel seriously. This study is on the development of the controlled low-strength and flowable filling material which is able to apply to the cavity behind the tunnel lining. The major materials of backfilling developed are a crushed sand and a stone-dust which exists as a cake-state and is a by-product obtained in the producting process of aggregate. It is conformed with the design standard to the physical characteristics of backfilling. The backfilling material developed is designed to reduce the fair amount of cement. According to the designed compound ratio, it is carried out the laboratory tests such as a compressive strength and a chemical analyses and is applied to dilapidated old tunnel for an application assessment.
Keywords
Filling material; Tunnel cavity; Stone dust; Crushed sand;
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