Over the past few decades, a large number of precast segmental utility tunnels have been constructed. Intensive research efforts have been devoted to understanding their performance under service and seismic loads. However, the vulnerability of precast segmental utility tunnels against accidental blast loads is seldom discussed. The present study performs a comprehensive numerical investigation on precast segmental utility tunnels against ground surface explosion. The numerical model is verified against testing data based on buried RC structures and semi-analytical equations in TM 5–855-1. Three types of precast tunnel connections are investigated, i.e., connection without shear keys, connection with trapezoid-shaped shear keys, and connection with wedge-shaped shear keys. The effects of detonation location and prestressing conditions are evaluated. The performances of precast segmental utility tunnels under low-level, medium-level and high-level threat explosions are obtained and compared with those of the conventional monolithic utility tunnel. Discussions on the dynamic responses and energy dissipation (ED) of different precast segmental utility tunnels are made. The influences of energy dissipating (ED) bar, shear link and burial depth on the dynamic responses of the precast segmental utility tunnel are also investigated numerically.

在过去的几十年里，已经建造了大量的预制管片管段。深入的研究工作致力于了解它们在使用和地震载荷下的性能。然而，很少讨论预制管片管段对意外爆炸载荷的脆弱性。本研究对预制管片式综合管廊抗地表爆炸进行了全面的数值研究。该数值模型根据基于埋地 RC 结构和 TM 5-855-1 中的半解析方程的测试数据进行了验证。研究了三种类型的预制隧道连接，即无剪切键连接、梯形剪切键连接和楔形剪切键连接。评估了爆轰位置和预应力条件的影响。获得了预制管片管片在低、中、高威胁爆炸下的性能，并与常规整体式管廊进行了比较。讨论了不同预制管片管段的动力响应和能量耗散（ED）。还数值研究了消能 (ED) 杆、剪力链接和埋藏深度对预制管片综合管廊动力响应的影响。讨论了不同预制管片管段的动力响应和能量耗散（ED）。还数值研究了消能 (ED) 杆、剪力链接和埋藏深度对预制管片综合管廊动力响应的影响。讨论了不同预制管片管段的动力响应和能量耗散（ED）。还数值研究了消能 (ED) 杆、剪力链接和埋藏深度对预制管片综合管廊动力响应的影响。