Numerical Modelling of the explosion effect on buried transporting water, oil and gas piplines in different soils by ALE Method

Abstract

In this paper, parametric studies were performed on some pipes buried in soil under blast loadings. The effects of various parameters, such as the physical properties of liquid, air, soil, pipe, and T.N.T were investigated. The Arbitrary Lagrangian-Eulerian (ALE) method was used in the LS-DYNA software. In the following, a compared between liquids. The results show that, the pipe has undergone increased pressure and stress by reducing the fluid density. Also,This indicates that the higher the fluid density is, the less pressure and stress will be impose d on the pipe and vice versa. In general, the result demonstrates that a higher density of soil causes higher pressure and stress transfers on the pipe and explosion in lower soil density result in less damage to the pipe and acts as a damper under waves of explosion. In other words, higher density in the soil causes more pressure and stress transfers on the pipe and lower soil density acts as a damper under the waves of explosion. Now, knowing the soil type performance on the stress and pressure transfers in the buried pipes under explosion, it can be realized that pipes with high resistance should be used in soils with high density due to the transmission of high stress and pressure through the pipes considering the fact that buried pipelines, while in soils with lower density, pipes with lower resistance can be applied due to better soil performance like a damper and transmission of less stress and pressure through them. Therefore, with the correct selection of pipes in terms of resistance according to the regional soil type, a substantial sum can be economically saved for the implementation of oil and gas pipeline projects.

Keywords

• explosion
• buried pipes
• lagrangian-eulerian
• stress
• pressure
• ls-dyna