Reliability Model of TBM Main Bearing based on Nonlinear Strength Degradation Theory

doi:10.23940/ijpe.18.12.p15.30543065

Abstract

Abstract:

TBM main bearing is the key part of the main driving system of tunnel boring machines. Special working conditions determine its relatively complex structure, and at the same time, high reliability requirements are put forward. Based on the stress-strength interference model, the study of the residual strength time history of roller-raceway contact takes the nonlinear strength degradation and the dispersion of material into account, and the reliability of main bearing structure is calculated. Combined with engineering practice, taking the main bearing of rock tunnel boring machines in the water diversion project of Dahuofang Reservoir in Liaoning as an object, the remaining strength and reliability of each main structure of a three-stage time varying load are calculated, and the reliability of main bearing can be predicted based on this main bearing system model.

Key words: TBM main bearing, stress-strength interference model, nonlinear model of strength degradation, fatigue reliability

Xu Zhang, Yiqiang Zhang, Yue Sun, Baogang Wen, and Lijun Jiang. Reliability Model of TBM Main Bearing based on Nonlinear Strength Degradation Theory [J]. Int J Performability Eng, 2018, 14(12): 3054-3065.

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