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衬砌背后空洞是常见的公路隧道质量缺陷之一。衬砌背后空洞不但会恶化支护与围岩间的相互作用关系,还会给隧道结构带来巨大的安全隐患,是导致隧道衬砌结构产生病害主要原因。本文首先从设计、施工和养护3个方面系统地分析了衬砌背后空洞产生的主要原因,然后结合宁波地区11座公路隧道的无损检测数据对公路隧道衬砌背后空洞的变换规律进行了深入研究,研究成果可为国内外相关工程提供借鉴。
Lining behind the lining is one of the common defects of highway tunnel quality. The cavity behind the lining will not only worsen the interaction between the support and the surrounding rock, but also bring huge security risks to the tunnel structure, which is the main reason leading to the disease of the tunnel lining structure. In this paper, the main causes of the cavity behind the lining are systematically analyzed from the aspects of design, construction and maintenance. Then, the non-destructive testing data of 11 tunnels in Ningbo are used to study the transformation rules of the tunnel behind the tunnel. The results can provide reference for related projects at home and abroad.