Setting up simple estimating equations of TBM penetration rate using rock mass classification parameters

• Simple estimating equations of TBM penetration rate were set up. • A comprehensive database including 115 sets of data was compiled. • The independent variables were derived from rock mass classification parameters. Establishing a suitable TBM performance prediction model is benefit to the machine type selection, project scheduling and budgeting. Some regression equations using rock mass classification parameters had already been set up based...