作　　者： (闫孔明）; (张建经）; (王志佳）; (廖蔚茗）; (吴祚菊）;

机构地区： 西南交通大学土木工程学院,四川成都610031

出　　处： 《岩土力学》 2017年第9期2621-2628,2638,共9页

摘　　要： 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。 Underground pipelines used to transport fresh water,natural gas and petroleum are especially vulnerable to earthquake due to its long and deep features.Moreover,they have enormously adverse effects on emergency rescue,energy transportation and restructure after the earthquake.Non-uniform wave propagation triggered by the earthquake is considered as one of the most important causes which destroy long deep underground pipelines.Recently,the problem has drawn extensive concerns.However,there are few studies of shaking table tests on a pipeline under non-uniform earthquake excitation due to the limited experimental equipment.For a long deep underground pipeline,the large-scale double independent controlled table was utilized to study the response of underground pipelines under three-directional non-uniform earthquake excitation.Then the responses of acceleration,strain and displacement of pipelines were discussed under different types of earthquake excitation.From experimental results,different impacts of deep underground pipelines were obviously found on the motions of the ground surface and soil surrounding with the pipeline.In addition,the differences of bending strains of pipeline were great under non-uniform excitation and uniform excitation.If the bending strains of pipelines under earthquake excitation are designed to weaken or even ignore,it is difficult to explain the bending buckling failure of underground pipelines.

关 键 词： 非一致地震激励 振动台试验 地下管线