Causes of Cracks in Tunnel Secondary Lining and Application of High-Performance Repair Materials

Fu-Jun Pei （ Ningxia Communications Construction Group Co., Ltd., Yinchuan, Ningxia, 750000, China ）

简介

Cracks in tunnel secondary linings can significantly reduce structural load-bearing capacity and durability, thereby posing risks to operational safety. This paper analyzes the causes of such cracks from four perspectives: material properties, construction practices, design parameters, and environmental and operational conditions. Fluctuations in material quality, deficiencies in construction techniques, unreasonable design parameters, and environmental degradation are all potential contributors to crack formation. On this basis, the performance requirements for high-performance repair materials are discussed, including mechanical compatibility with the original lining, durability under tunnel environmental conditions, and workability and bonding performance conducive to construction. By examining common types of repair materials and construction techniques, and evaluating repair effectiveness in practical scenarios, this study proposes targeted crack prevention and repair strategies. The aim is to provide technical guidance for tunnel maintenance, thereby enhancing structural safety and extending service life.

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