Study On Influence Of Artificial Blasting On Gas Pipeline And Safety Control Measures

In recent years, with the development of China’s economic construction and the sharp increase in the construction of underground gas pipelines, and artificial explosions carried out in the vicinity of the gas pipelines have a great threat on gas pipeline safety. Therefore, this article studies the impact of artificial explosions on buried gas pipelines, which has important significance for the security of the pipes.Study first uses finite element software ANSYS/LS-DYNA to simulate the blasting of explosive in soil, and then works out the acceleration time histories of different amounts of explosives in different explosive center distance. The acceleration time histories are used as the excitation signals for subsequently studying response of the pipeline, of which characteristics and laws are analyzed. With powerful flow-solid coupling function provided by ADINA software and based on the interaction of flow-basic solid coupling and pipe-soil, a pipeline response model is established and the factors of response of buried pipelines under artificial explosion are studied on the basis of this model.This paper input artificial blasting seismic wave velocity from X, Y. Z three directions and finds that the pipe response is maximal when inputting seismic waves from the direction perpendicular to the pipe. In the study of various stresses, the axial tensile stress is often greater than stresses in the other directions. The axial tensile failure results in the failure of pipe under blast shock wave generated by artificial explosion.According to the simulation of pipeline power response of different amounts of explosives in different explosive center distance, the relation of pipeline explosive center distance and critical amounts of explosives are calculated. Through the relationship, critical amounts of explosives for carrying on artificial blasting can be worked out. Approximate exponential relation of explosion center distance and critical amounts of explosives can be found in the simulation results. Comparing simulation results with the results calculated by empirical formula, both of the trends and the resulting values of the two are similar to each other. Therefore, the conclusion of simulation has certain reference value.Under different friction coefficient, pipe wall thickness and depth of the pipeline and based on the simulation of pipeline dynamic response under blasting, the impacts of the parameters on seismic performance of the pipeline are as follows:the pipeline peak stress suffered by blasting first increases and then decreases within a certain range along with the friction coefficient; it shows a negative correlation between the peak stress and the pipe wall thickness, and a positive correlation between the peak stress and the depth of the pipeline.On the basis of these studies, combining with related theory, this paper proposes safety-measures for artificial blasting near buried gas pipelines and offers a reference for reducing the damages caused by explosion during designing, constructing and operating pipelines.