Abstract:

In order to improve the geological adaptability of TBM disc cutter and reduce the disc cutter wear rate, a new test method to study the relationship between disc cutter parameters and wear rates is proposed based on composite disc cutter abrasion test platform. The wear rules of small sized disc cutter under different lithologies, penetration rates and geometric parameters (such as cutter width, cutter shape and cutter diameter) are studied. The wear statistical results indicate that: 1) The cutter wear is positively correlated with the square of CAI (cerchar abrasvity index) value of rock sample. 2) The wear rate of disc cutter with large width is higher than that with small width. 3) The disc cutter with corner has better wear resistance compared to that with flat edge. 4) The diameter of disc cutter affects the wear rate little; but disc cutter with large diameter allows more wear in radial direction. 5) The cutter wear can be reduced and high rockbreaking efficiency can be achieved under large penetration rate within a certain range.

Key words: TBM, disc cutter, composite abrasion test platform, wear test, geometric parameters