Verification of Buckling Stability of TBM Thrust Jack on Helical Segment by Compression Test and Fatigue Analysis

Abstract

For using helical segments in shield TBM, the thrust jacks compress on the inclined side wall of the segments. In the inclined condition, eccentric force and bending moment occur in the thrust jack module. Those induce a buckling deformation of the hydraulic cylinder parts, which causes oil leakage, plastic deformation, and fatigue damages. The paper examined the buckling reliability of thrust jack contacting on the inclined surface. A static and fatigue analysis was conducted for analyzing the stress concentration of the module. Compression testing system are installed, and then the compression test was conducted for a TBM thrust jack. The testing data is obtained and analyzed for verification of the buckling stability.