The invention discloses a rock
mass classification method for a TBM tunnel. The rock
mass quality of surrounding rock
mass is determined by taking a rock mass basic quality index BQ as a criterion under the consideration of rock mass
hardness and rock mass integrity and the consideration of the combination relationship of
groundwater, ground stress,
engineering axis orientation and occurrence of main structural planes as dressing factors. The method comprises the following steps: 1, performing inversion formula calculation according to the relationships between uniaxial saturated
compressive strength of rock mass and TBM equipment parameters, tunneling parameters and
slag morphological parameters; and 2, performing calculation according to the relationship between a rock mass integrity coefficient and the TBM equipment parameters, tunneling parameters and
slag morphological parameters. Based on the classification method of surrounding rock of underground
engineering in the current Classification Standard for
Engineering Rock
Mass, parameters being difficult to obtain are avoided. The relationships between the easily obtained tunneling parameters as well as
slag characteristics andthe indexes required for rock strength and integrity are determined according to the composite relationship between rock,
machine and slag in the TBM construction process, thereby achieving the rapidsurrounding rock division of tunnel in TBM construction.