Abstract: Shield tunneling machine load is closely connected with the geological condition，Effective control on total thrust of shield tunneling machine is vital for the equipment operating security and efficiency. The characters of total thrust and influence of operating parameters, geological parameters and equipment configuration over total thrust are analyzed. Mechanical model of total thrust is established through the mechanical analysis and dimensional analysis. Inverse identification from on-site data is carried out for mechanical model coefficients via the multiple regression method. Based on the on-site data acquired from Rd. Shiyijing to Rd. Dazhiguxi of Tianjin No. 9 subway project, model residual is discussed using statistical analysis. By comparing the massive on-site data and mechanical model prediction results, model feasibility is discussed. Analysis indicates that established mechanical model is able to reflect the interactions among the total thrust, excavation speed and geological parameters. The model can serve as the reference for thrust selection and control in engineering.

Key words: dimensional analysis, massive on-site data, mechanical model, residual analysis, total thrust