Abstract：
To reduce the secondary lining concrete cracks of the tunnel during the operating period, preventive mea? sures shall be taken during construction, and the crack self-healing technology is an effective method to achieve this goal. Through comparison with the technologies such as shape-memory alloy (SMA) method, hollow-core optical fiber and hollow-core fiber method, microbial mineralization method and capsule-based coating self-healing technique, it is concluded that the microcapsule-based coating self-healing technology has the following advantages:easy concrete mixing, even distribution of capsules, rapid response to cracks and long-term sustainability. This technology has been applied to the construction of Liyang Jiaoweiqin Tourist Complex Tunnel, in which self-healing capsule materials have been tested and detected and the anti-cracking effect and self-healing capacity of concrete mixed with microcapsules have been traced and observed. The research shows that the self-healing capacity of the secondary lining concrete mixed with microcapsules is extremely strong. With stress sensitivity, high bond strength and permeability, the self-healing agent can obviously reduce the width of cracks on 7 d after cracks occur, and cracks can be basically healed on 21 d and completely healed on 28 d.
CAO Yan1 WANG Ruiwen1,
2 ZHAO Weiwei2 SHI Qibin3 PAN Xuhui3 OU Dingfu1,
2
.Application Research on the Bionic Self-healing Technology for Secondary Lining Concrete of Tunnels[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(6): 250-257
2022, Vol. 59 