关键词: 综合管廊, 水气共舱, 燃气爆炸, 同舱管道, 椭圆度

Abstract: In the case of "water and gas sharing" in the integrated pipeline corridor, if the gas pipeline leaks and causes the explosion, it may lead to the failure and damage of the water supply pipeline in the same tank. In order to study the influence of gas explosion on the same cabin pipeline, the method of methane-air mixed gas was defined by the nonlinear finite element program ANSYS/LS-DYNA, and the changes of strain, stress, vibration velocity and displacement of the same cabin pipeline under the action of gas explosion were studied through numerical simulation. According to the criterion of elliptic failure, the four influencing factors of pipe wall thickness, internal pressure, elastic modulus and yield strength were quantitatively analyzed. The results show that, under the action of gas explosion, the ovality of the same tank pipeline is negatively correlated with the wall thickness, internal pressure, elastic modulus and yield strength, and the yield strength has the least influence on the ovality of the same tank pipeline, all of which are lower than 3% of the critical dimensionless ovality. When the change rate of the influencing factors increases from 2.5% to 15%, the influence of wall thickness and elastic modulus on the ovality of the pipeline is higher, while the influence of internal pressure and yield strength on the ovality of the pipeline is lower. The research results can provide reference for the planning and design of the "water-air co-cabin" in the integrated pipeline corridor and the improvement of relevant norms.

Key words: integrated pipe corridor, integrated water and gas pipeline, gas explosion, cabin piping, ovality