Experimental study on dynamic response of underground utility tunnel under surface explosion
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摘要: 为研究地下综合管廊结构的抗外部爆炸性能,针对整体现浇管廊和预制节段拼装管廊结构在地面爆炸作用下的动力响应特性和破坏模式开展了野外爆炸试验研究。通过11个工况的野外爆炸试验,观测了现浇管廊和预制节段拼装管廊在不同比例距离爆炸工况下的破坏特征和动力响应,对比分析了现浇管廊和预制节段拼装管廊的抗爆性能。研究结果表明:地面爆炸作用下,现浇管廊和预制节段拼装管廊顶板最终均出现弯剪破坏,整体现浇管廊的抗爆性能总体上优于预制节段拼装管廊;起爆位置对预制节段拼装管廊爆炸响应的影响较大,在节段中心上方起爆时较为不利;在小比例距离地面爆炸作用下,现浇管廊的损伤区域大于预制节段拼装管廊,预制节段拼装管廊的损伤集中在近爆心下方所在的节段或连接接缝处,节段间可产生较大残余滑移。
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关键词:
Abstract: To investigate the anti-external-blast performance of underground utility tunnel structures, field explosion tests were conducted to study the dynamic response characteristics and failure modes of cast-in-place and precast segmental utility tunnel structures subjected to the ground surface explosion. Via field explosion tests including 11 cases, the failure characteristics and dynamic responses of cast-in-place and precast segmental utility tunnels were observed under explosion with different scaled distances. And the anti-blast performance of cast-in-place and precast segmental utility tunnels was compared and analyzed. The research results indicate that both the roofs of the cast-in-place and precast segmental utility tunnel ultimately exhibit bending and shear failure, when subjected to ground surface explosion. The anti-blast performance of the cast-in-place utility tunnel is better than that of the precast segmental utility tunnel. The initiation position has a significant impact on the blast responses of the precast segmental utility tunnel, and it is unfavorable when the initiation position is above the center of the segment. Under a small-scale ground surface explosion, the damaged area of the cast-in-place utility tunnel is larger than that of the precast segmental utility tunnel. The damage of the precast segmental utility tunnel is concentrated in the section or connection joint located near the explosion center, and there is a significant residual slip between segments.
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