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  Prediction of TBM Performance Based on Full-Scale 3.54m Shield TBM Tunnelling Tests in Artificial Homogeneous Rock Mass Conditions

  The most important parameter used for predicting the TBM performance is the penetration depth(mm/rev) used in terms of advance rate. The factors which significantly affect the penetration depth are rock mass parameters, design of the cutterhead, and TBM operational parameters. In field tunnelling, it is difficult to accurately match the rock mass conditions and TBM operational data because of the limitation of the extent of investigation and face mapping. Therefore, in this study, a full-scale shield TBM tunnelling center in Korea was established to allow TBM excavation in homogenous rock mass conditions in order to accurately derive a prediction model for advance rate. Artificial rock mass having volume of 87.5m3 was created without any joints with the help of mortar having 55MPa uniaxial compressive strength(UCS). An EPB shield TBM was manufactured with a cutterhead diameter of 3,540mm. The cutterhead was designed with a total of 26 disc cutters each of 17 in. size. Stepwise tunnelling tests using full-scale shield TBM were conducted with 18 sets of operational conditions which included five thrust force levels and four RPM levels. This methodology was adopted for two reasons; firstly, to analyse the relationships between penetration depth and TBM operational parameters and secondly, to suggest the optimum operational conditions TBM in the rock mass developed in this study through torque-RPM curve. The results show good agreement between normal force and penetration rate and empirical relationships were established between the two of them. As the penetration depth is obtained from the TBM data, the results show that RPM has no effect on the penetration rate. The relationships between thrust force and torque at different RPM levels were also established for performance prediction.

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