The lining void exists widely in the construction of tunnels, which would in time have a negative im-pact on the capacity and the durability of the lining structure without being dealt with. The studies nowadays mostly focus on the causes of the void in the crown of the arch, as well as its influence and solution. While the studies on the distribution, characteristics of the void, and the relationship between the void and the condition of the surrounding rock are lacking. Through the statistical analysis of the nondestructive testing results on the tun-nel, it found out that the lining void is the main defect during the construction. It concludes that 37% of voids happened in the crown. The length of void is in accordance with Passion distribution/function with the λ of 4.76m. The distribution of lining disengaging depth is in accordance with the normal distribution of N(9.3,3.62) . The better the condition of surrounding rock is, the bigger length and the smaller depth the void has. Grouting has more positive effects on the void in the crown than in the side wall. Results are of great importance for the nondestructive testing, solution and prevention of the void during constructions.%隧道施工中衬砌脱空缺陷广泛存在，若处理不及时将极大的影响衬砌结构承载力和耐久性。现有研究多局限于分析拱顶脱空的成因、影响和整治方法，缺乏探究衬砌脱空的分布规律、空洞特性及其与围岩条件的关系。通过统计方法分析某隧道整治前后无损检测结果，可得衬砌脱空为主要施工缺陷，拱顶脱空占总脱空37%；脱空长度分布服从λ为4.76 m的泊松函数，深度分布服从N(9.3,3.62)的正态分布；围岩条件越好，脱空长度越大，深度越小；注浆整治效果在拱顶好而在边墙部分较差。研究结果对脱空缺陷无损检测、脱空处理及施工预防具有重要意义。
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