Polyurea coating and carbon fibre reinforced polymer reinforcing techniques were applied to retrofit a severely damaged urban utility tunnel (UUT). The blast responses of the retrofitted UUT were investigated through in-filed explosion experimental tests, and the displacements, strains, accelerations, and damage were compared. The retrofitted UUT exhibited comparable or even better blast resistance than the intact UUT. Although the polyurea coating was flexible, it exhibited excellent performance in improving the blast resistance of the damaged UUT. As the UUT reinforced with basalt fibre reinforce polymer (BFRP) bars has smaller damage compared with the UUT reinforced with steel bars, its retrofitting is simple, and the cost is low. The roof was simplified as an elastically simple support one-way slab. Euler beam theory was adopted to analyse the dynamic responses of UUT roof considering the interaction between soil and structure, which agree well with the experiments in the first three cases.

应用聚脲涂层和碳纤维增强聚合物增强技术对严重损坏的城市公用隧道 (UUT) 进行改造。通过现场爆炸实验测试研究了改造后的UUT的爆炸响应，并比较了位移、应变、加速度和损伤。改造后的 UUT 表现出与完整的 UUT 相当甚至更好的抗爆炸性。尽管聚脲涂层具有柔韧性，但它在提高受损 UUT 的抗爆炸性方面表现出优异的性能。由于玄武岩纤维增强聚合物（BFRP）钢筋增强的UUT与钢筋增强的UUT相比损伤更小，改造简单，成本低。屋顶被简化为一个弹性简单的单向支撑板。