| With the continuous development of society,China aims to achieve the goal of "double carbon" as soon as possible,but natural gas,as a clean,efficient and low-carbon energy source,contributes a great value to the realization of carbon neutrality.Rapid urban development makes it necessary to use underground space wisely.Gas pipelines are laid in underground integrated corridors,however,natural gas leaks in the corridors can easily lead to explosive accidents.Explosions caused by leaks in pipelines carrying natural gas in the corridor often occur,endangering people’s lives and huge property damage in the event of an explosion.This paper relies on an underground integrated pipe corridor,using similar theory to determine the dimensions of the test model and numerical simulation,to design the test model template,cast model specimens,and gas chamber reinforced carbon fiber cloth for dynamic response tests under the action of implosion;using ANSYS/LS-DYNA finite element software and multi-matter fluid-solid coupling algorithm,a comprehensive pipe corridor calculation model is established to analyze the dynamic response characteristics of gas chambers under reinforced carbon fiber cloth conditions at different locations,and the research results show that.(1)The results show that in the main structure of the gas compartment,the greatest stresses are in the centre of the backblast surface of the outer wall and compartment,while the least stresses are in the centre of the backblast surface of the bottom plate.In the outer walls,the maximum stresses are concentrated in the centre of the structure.(2)With the increase in explosive power,the damage to the reinforced layer of carbon fibre cloth on the inner wall of the gas chamber became greater and greater.Under the action of 15 g of emulsion explosive,the structure of the model test piece was completely damaged,while under the action of 10 g of emulsion explosive,only two longitudinal cracks through the model test piece appeared,and the structure of the test piece was still mostly intact.(3)With two layers of carbon fibre cloth reinforced on the inner wall of the gas chamber,the damage to the model specimen of the pipe gallery under the same charge conditions was greatly reduced compared to one layer of carbon fibre cloth.Under the action of 15 g of emulsion explosive,a longitudinal crack was produced in the centre of the external wall of the gas compartment,a through longitudinal crack at the joint between the bulkhead and the external wall,and a through longitudinal crack at the joint between the bottom plate and the external wall.The integrity of the pipe gallery model is still relatively intact.There were no cracks or visible signs of damage to the external wall of the gas compartment of the pipe gallery model specimen under the action of 10 g of emulsion explosive.(4)With the carbon fibre fabric reinforced at different locations on the inner and outer walls of the gas chamber,the one layer of carbon fibre fabric reinforced on the outer wall under the action of 15 g of emulsion explosives left no visible signs of damage to the pipe gallery model specimen,while greatly protecting the structural integrity of the pipe gallery.However,the two layers of carbon fibre fabric reinforced on the inner wall still caused through longitudinal cracks in the pipe gallery model specimen,allowing major damage to occur in the gas chamber structure of the pipe gallery.This further demonstrates that the outer wall reinforced carbon fibre fabric provides better protection to the gallery structure.Figure 63 Table 20 Reference 72... |
