地面爆炸作用下地下综合管廊动力响应的实验研究OA北大核心CSTPCD

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 of 11 cases,the failure characteristics and dynamic responses of cast-in-place and precast segmental utility tunnels under explosion at different scaled distances were observed. The anti-blast performance of the cast-in-place and precast segmental utility tunnels was compared and analyzed. The research results indicate that both the roofs of cast-in-place and precast segmental utility tunnels ultimately exhibit bending and shear failure when subjected to ground explosion. The anti-blast performance of the cast-in-place utility tunnel is better than that of the precast segmental utility tunnel. The detonation position has a significant impact on the blast response of the precast segmental utility tunnel,and it is unfavorable when the detonation 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.