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管道在断层错动作用下容易产生较大的位移,从而导致管道因较大的应变而失效,因此研究断层作用下管道的应变计算方法对穿越断层长输管道的设计与安全评估具有重要意义。理论解析计算方法计算简单、效率高,因而在长输管道的初步设计中应用广泛。简要介绍了Newmark-Hall方法、Kennedy方法及Karamitros方法 3种应用较为广泛的管道应变理论解析计算方法,并与有限元结果进行对比分析,从管道穿越角、管道埋深、土壤类型及管材类型4个方面讨论了3种理论解析方法在走滑断层情况下的适用性。结果表明:Newmark-Hall方法、Kennedy方法适用于分析管道穿越角β<45°且断层位错量较大时的断层错动影响;Karamitros方法在各种工况下均具有较好的适用性,尤其是当穿越角β≥45°时,前两种方法的适用性极其有限,应该选择模型相对复杂的Karamitros方法进行计算。
Therefore, it is of great significance to study the strain calculation method of pipeline under the action of faults to design and evaluate the safety of the long-distance pipeline crossing the fault. The theoretical analysis and calculation method is simple in calculation and high in efficiency, so it is widely used in the preliminary design of long-distance pipeline. This paper briefly introduces three methods of analytical calculation of pipe strain, which are Newmark-Hall method, Kennedy method and Karamitros method, and compares them with finite element results. From the angle of pipeline crossing, the depth of pipeline, soil type and pipe type 4 On the one hand, the applicability of three kinds of theoretical analytical methods in the case of strike-slip faults is discussed. The results show that the Newmark-Hall method and the Kennedy method are suitable for the analysis of fault dislocation effects when the pipeline crossing angle β is less than 45 ° and the fault dislocation amount is large. The Karamitros method has good applicability in various working conditions, Especially when the crossing angle β ≥ 45 °, the applicability of the first two methods is extremely limited, and the relatively complicated model of Karamitros method should be chosen for calculation.