针对水平非均匀场地中埋地油气管道的地震响应,开展了埋地油气管道振动台试验和有限元模拟分析,研究了不同强度地震激励下埋地油气管道的应变和加速度响应,以及场地管周土体的加速度和位移响应规律。结果表明:研发的土箱能够满足试验的要求,试验方案合理可行;由于非均匀场地土体特性的不同,在地震激励下不同土体的动力响应不一致,进而会对管道不同区段形成不同的动力作用,加剧管道整体的动力响应;随着加载等级的提高,土体在振动过程中先是被压实,然后逐渐破坏,土体的非线性特征越来越明显,管道振动现象更为明显;相比于均匀场地条件,相同工况非均匀场地条件下的管道应变峰值和加速度峰值响应明显增大,表明非均匀场地条件下管道周围的土体破坏更为严重,管道的运动更加剧烈。建议在埋地管道抗震设计中要考虑非均匀场地条件和管周土体特性不一致对管道地震响应的增大影响。
In view of the seismic response of buried oil and gas pipelines in horizontal inhomogeneous soil, the shaking table test and finite element simulation analysis of buried oil and gas pipelines were carried out, and the strain and acceleration response of buried oil and gas pipelines under different intensity seismic excitation, as well as the acceleration and displacement response law of the soil around the site were studied. The results show that the developed soil box can meet the requirements of the test, and the test scheme is reasonable and feasible; Due to the different characteristics of the soil in horizontal inhomogeneous soil, the dynamic response of different soil under the earthquake excitation is not consistent, which will form different dynamic effects on different sections of the pipeline and aggravate the dynamic response of the whole pipeline; With the improvement of the loading level, the soil is first compacted and then gradually destroyed during the vibration process. The nonlinear characteristics of the soil are more and more obvious, and the pipeline vibration phenomenon is more obvious. Compared with the homogeneous soil condition, the peak strain and peak acceleration response of the pipeline under the inhomogeneous soil condition under the same working condition are significantly increased, indicating that the soil around the pipeline is more severely damaged and the pipeline movement is more intense under the inhomogeneous soil condition. It is suggested that in the seismic design of buried pipelines, the increasing influence of inhomogeneous soil conditions and the inconsistent soil properties around the pipeline on the seismic response of the pipeline should be considered.
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