Research on the Configuration and Ring Optimization of Compact TBM Hobs with Ultra Small Turning Radius
The drainage systems of pumped storage power stations are mostly underground permanent drainage corridors,with small tunnel diameters,long tunnel lines,multiple turns,and slow construction progress and high risks.Wendeng Power Station was the first to use compact TBM with ultra small turning radii for drainage corridor construction.During TBM excavation,the configuration and wear rate of rollers cannot refer to conventional TBM.By analyzing the rock breaking mechanism of TBM hobs,research was conducted on the kinematic and stress characteristics of hobs,and in-depth research was performed on the failure law of hobs;for the ultra small turning radius TBM,the material selection and arrangement of the hob were studied by calculating and analyzing the structure and arrangement position of the hob;in response to the problem of rapid wear of the rolling cutter and abnormal damage to the cutting ring during TBM trial,the cutting ring was optimized and a biased cutting ring was developed to solve the problem of rapid wear and damage of the cutting tool during hard rock small turning excavation.Practice has shown that adopting these technologies has ensured project quality and improved construction efficiency,and relevant experience is worth learning from.
TBMrolling cutterknife ringultra small turning radiuscompact
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