Abstract: In the past years, serious tube bursting accidents occurred six times in buried large diameter FRP pipe in the water distribution system from a certain southern city, which threatened the reliability of the water distribution system. In order to study the reasons of tube bursting accidents, in this paper, a series of mechanical properties tests, containing tension, compression and bending tests were carried out on the pipe at the explosion. At the same time, according to the geological conditions of pipe, combining the mechanical performance parameters of the pipe, the mechanical properties of buried FRP pipe were calculated and analyzed theoretically, including the long-term deformation of pipe, the strength and the stability of pipe wall. On the basis of the results of the test and theoretical calculation, it is concluded that the reasons of the explosion are inferred, and the corresponding suggestions are put forward to reduce the frequency of pipe explosion accident.

Key words: soft soil foundation, FRP pipe, pressurized water transmission pipe, pipe explosion, mechanical performance