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用于输水、输气及输油等长大地下管线在地震中易发生破坏,且对灾后紧急救援、能源输送等救灾和重建工作影响极大。对于诱发地下长大管线破坏的因素而言,非一致场地波动是最重要的因素之一,如今这一问题已引发众多研究,但受试验设备限制,少有研究者开展非一致激励下管线响应的试验研究。针对长大地下管线受地震波的影响效应,利用独立控制的双台面大型振动台试验设备研究了三维非一致地震激励作用下地下管线的响应,探讨了管线的加速度、应变以及位移等参数的变化规律。试验结果表明:深埋地下管线的存在对管线周围土体和地表的地震响应影响程度不同;在一致和非一致地震激励下,管线的弯曲应变峰值区别较大;规范设计时弱化甚至忽略管线弯曲应变,这种做法难以解释管线弯折破坏。
The underground pipelines used for water conveyance, gas transmission and oil transportation are prone to damage during the earthquake and have a great impact on disaster relief and reconstruction work such as post-disaster emergency rescue and energy transmission. Non-uniform field fluctuations are one of the most important factors for inducing the damage of underground pipelines. Nowadays, this issue has caused a great deal of research. However, due to the limitation of test equipment, few researchers have conducted pipeline responses under non-uniform excitation Experimental study. In view of the effect of seismic waves on the underground pipelines growing under large scale, the response of underground pipelines under three-dimensional non-uniform seismic excitation is studied by means of an independently controlled double-deck large-scale shaking table test equipment. The variation rules of acceleration, strain and displacement of pipeline are discussed . The experimental results show that the existence of deep underground pipeline affects the seismic response of soil and surface around pipelines to a great extent. The curves of pipelines have different peak values of peak bending stress under uniform and non-uniform seismic excitation. Strain, this practice is difficult to explain the pipeline bending damage.