Abstract
The present study deals with instrumentation for measuring tool force and twist exerted on a disc cutter which is penetrated into rock with a plunge angle and rolled along a circular truck. The plunge angle of disc cutter was chosen as a control variable, ranging from 0 to 30 degrees. The Investigation ha s provided the experimental formulae for predicting the tool force imposed on inclined disc cutter including TBM gauge cutters as follows:(a) thrust FT=KT tan (φ/2+α)P1/2, (b) rolling force FR=KR tan (φ/2+α)P, (c) lateral force FL=KL tan (φ/2+α) tan αP3/2, where P is disc penetration, φ is the edge angle of disc, α is a plunge angle of disc against rock surface, and KT, KR and KL are constants. Moreover, themeasurement has shown that the twist about the direction of thrust should be accompanied by tool force whenever a disc cutter is penetrated into rock with someplunge angle. These results allow us to comprehend the reason why gauge cuttersand peripheral cutters have experienced much more trobles than face cutters duringtunnelling operation with TBMs, and their operational life-spans are in general shorter than those of face cutters.
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