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- Title
Study on anti-crack and anti-seepage performance of lining concrete in bored tunnel engineering.
- Authors
WANG Demin; LIU Hanhong; JI Xiankun; WANG Hailin; GONG Chenjie; XU Ke
- Abstract
In order to study the crack resistance of concrete lining in bored tunnel engineering, the test was carried out in a project. The results show that, the concrete prepared by fiber crack resistant composite materials has good anti-crack and antiseepage performance. The compressive strength of 7 d and 28 d age was basically the same as that of control concrete, the splitting tensile strength increased by 7.5% to 11.4%, the flexural strength increased by 11.6% to 12.3%, and the impermeability grade increased from P8 to P12. The monitoring data of the secondary lining concrete of the solid structure of the underground excavation tunnel project show that when the average thickness is 450 mm, the time of the steel formwork with the mold should be extended by 1~2 d or 1~2 d thermal insulation maintenance should be added after the removal of the formwork, so that the reduction rate of the first three days of the cooling stage is controlled within 5°C/d, which can further reduce the early temperature shrinkage. The maximum microstrain value of the solid structure about 104 µε after the early temperature correction, and it was reduced to -72 µε~-13 µε after two weeks. The early good crack resistance can effectively reduce the risk of non-structural shrinkage cracking.
- Subjects
UNDERGROUND construction; THERMAL insulation; COMPOSITE materials; CONCRETE; ENGINEERING; TUNNEL lining
- Publication
New Building Materials / Xinxing Jianzhu Cailiao, 2023, Issue 12, p103
- ISSN
1001-702X
- Publication type
Article