In this paper, the field monitoring method is used to study the variation of rock mass pressure during the construction of a tunnel\nin phyllite stratum, and three functions are used to fit and analyze the variation of rock mass pressure with deformation,\nexcavation time, and space. The results show the following (1) When the deformation increases significantly, the rock mass\npressure decreases firstly and then increases. This is caused by the insufficient bearing capacity of the rock mass in the arch foot of\nthe supporting structure after the excavation of the upper bench, which leads to a settlement of supporting structure and\nsurrounding rock. (2) Compared with other kinds of fitting functions, the logistic function can better characterize the variation of\nthe pressure of surrounding rock with deformation, excavation time, and distance from the face. This paper provides a reliable\nreference for the design and construction of the tunnel in phyllite stratum. The logistic function can be used to present and predict\nthe change of rock mass pressure with deformation, excavation time, and space in similar rock mass conditions.
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