爆炸荷载作用下浅埋综合管廊野外试验与弹性动力响应分析

为了研究管廊结构在爆炸荷载作用下的荷载分布规律、动力响应及破坏机理,评估管廊工程的防护潜力,获取管廊在爆炸荷载作用下的试验数据,设计并开展了管廊结构的抗爆试验.本文主要分析了在比例爆深为2.000,1.587,1.260 m/kg^1/3三种工况下管廊顶板中心处的动力响应.试验测得了三种工况下爆坑大小,以及顶板中心底部纵筋和箍筋及侧墙中心内侧箍筋应变时程曲线、加速度时程曲线、反射压力时程曲线和位移时程曲线.试验数据表明,顶板中心底部箍筋应变远大于纵筋,且振动使管廊产生的反复位移大小相当,建议管廊采用对称配筋、箍筋加密、混凝土保证抗压强度.通过常规武器效应计算软件CONWEP计算并验证了反射压力峰值的准确性,进一步得到了作用于管廊的总压力并将其简化为均布荷载,计算出弹性响应阶段顶板中心的最大位移,与实测位移进行比较,吻合较好.

Field test and elastic dynamic response analysis of shallow-buried utility tunnel under explosion load

In order to study the load distribution rule,dynamic response and failure mechanism of the tunnel structure under explosion load,evaluate the protection potential of the tunnel project,and obtain the test data of the tunnel under explosion load,the anti-explosion test of the tunnel structure is designed.This paper mainly analyzes the dynamic response at the center of the roof under three working conditions of the proportional blasting depth of 2.000,1.587 and 1.260 m/kg^1/3.The test measures the size of the blasting pit,the time-history curves of the longitudinal bars and stirrup at the bottom of the roof center and the inner stirrup at the center of the side wall,acceleration time-history curve,reflection pressure time-history curve and displacement time-history curve.The test data show that the stirrup strain at the bottom of the roof center is much greater than that of the longitudinal bars,and the repeated displacement caused by the vibration of the tunnel is about the same.It is suggested that the tunnel should be symmetrical reinforcement and stirrup encryption,and ensure the compressive strength of concrete.The accuracy of the peak of reflected pressure is verified by the conventional weapon effect calculation software CONWEP,and the total pressure acting on the tunnel is further obtained and converted into uniform load.The maximum displacement of the roof center in the elastic response stage is calculated,which is in good agreement with the measured displacement.