ひび割れ

[V-492] Examination of crack condition by shrinkage test and distribution spring analysis intended for crown part of tunnel lining concrete

*東 邦和¹、齋藤 隆弘¹、小野 緑¹、張 志セン¹、岩波 光保² (1. 奥村組　技術研究所、2. 東京工業大学 環境・社会理工学院)

Keywords:tunnel lining concrete, drying shrinkage, autogenous shrinkage, crack, thermal stress analysis

The crown of lining concrete is a part where crack in the axial direction of the tunnel is likely to generate. The size of shrinkage was determined from the results of free drying shrinkage and the restraint drying shrinkage, and an analysis model using a distribution spring was examined. The measurement result on the field was shown, and the sizes of the stress generated in the lining was compared by the analysis model. Assuming the deterioration of lining concrete, we examined the effect of cracking conditions such as tensile strength and shrinkage progress on crack initiation.