Underground pipelines will be damaged under the action of external loads and human factors, resulting in ground collapse. To investigate the impact of particle shape on ground subsidence following pipeline breakage, numerical simulations strata subsidence were conducted by PFC-2D. About 3 kinds of coarse particle shapes were defined by PFC-2D, and the effects of particle shapes on formation loss, surface settlement and collapse form were analyzed. The simulation results show these as follou's. The time required for the classification is shortest when particles of different shapes reach the same degree of settlement at the center. The relative motion angle is defined to distinguish between particles that are relatively stationary during collapse. It is determined that the range of the soil stratum affected increases as the particle shape becomes more regular. There are variations in the sliding contact rate and cumulative rotation angle of particles among different particle shapes, which may result in different particle movement modes and, therefore, different ground subsidence mechanisms. There study findings are useful in preventing ground subsidence.