About the author:

China Railway 18th Bureau Group Third Engineering Co., Ltd., Zhuozhou, Hebei 072750, China

Abstract:

Due to many factors such as shield friction during shield construction, the effective thrustapplied to the working face is often less than the total thrust actually provided by the hydraulic cylinder.Accurate evaluation of the effective thrust can effectively improve the stability and economy of shieldconstruction, but relevant research results are still scarce. In order to more accurately predict theeffective thrust on the working face and the penetration rate of the cutterhead during shield construction inhard rock formations, a matrix analysis framework and prediction model were established based on theYlvie model considering the formation characteristics. The Ylvie model was compared with the Heikalmodel in the prediction of shield friction loss, and compared with the Gehring and CSM models in theprediction of penetration rate,verifying the accuracy of the prediction model constructed in this paper.The analysis results show that during the shield construction in the study area, the loss of total thrust dueto shield friction reached 41%.