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To ensure the mud discharge performance of the atmospheric cutterhead and reduce the risk of clogging, it is necessary to consider the distribution of soil in the cutterhead opening under different tunneling parameters. Taking the Haizhuwan tunnel project as an example, the rheological properties of soil and slurry samples were collected and analyzed. The full-scale mud discharge model of cutterhead was established for the first time by using the Euler multiphase flow model. By examining the pressure value of the monitoring point of the excavation chamber, the simulation parameters agree with the field-measured data. The simulation results show that the soil content in the center area and the edge area of the cutterhead is more than 60% and 15% respectively, which is much higher than that in other areas. The mathematical model of soil content and tunneling parameters was established, and the measures to reduce the soil content were explored. By comprehensively analyzing the variation law of soil content in the central and edge areas, it is beneficial to improve the mud discharge performance of the cutterhead by reducing the penetration rate and increasing the cutterhead rotation speed and grouting rate.

来源平台：KSCE JOURNAL OF CIVIL ENGINEERING