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为了研究富气输送对管道动态断裂的影响,建立了富气输送裂纹动态扩展管道模型。考虑管道开裂后富气存在相变现象,利用多参数状态方程计算由富气相变引起的压力平台高度,建立三段线性压力模式模拟富气输送管道裂纹尖端附近压力场的分布。结合全尺寸爆破实验和通过扩展模式模拟的结果,验证了该模型的正确性。在此基础上,研究了不同组分富气对管道动态断裂的影响,得到了动态断裂参数随着富气中凝析液体积百分数的增加而增大,即证明了采用富气输送模式管道一旦开裂就更难止裂。
In order to study the influence of rich gas transportation on the dynamic fracture of pipeline, a model of dynamically expanding pipeline for rich gas transportation crack was established. Considering the phase transition phenomenon of rich gas after pipeline cracking, the multi-parameter state equation was used to calculate the pressure platform height caused by gas-rich phase transition and the three-stage linear pressure model was established to simulate the distribution of pressure field near the crack tip of gas-rich pipeline. The correctness of the model is verified by combining the full-scale blasting experiment and the result of extended mode simulation. On this basis, the influence of different components rich gas on the dynamic fracture of the pipeline was studied, and the dynamic fracture parameters were obtained as the volume percentage of condensate in the enriched gas increased, which indicated that once the gas pipeline with rich gas delivery mode Cracking is more difficult to crack.