In fractured rock, increasing the thrust force alone may not always improve the penetration rate and can even be detrimental. The key is to optimize the thrust force in conjunction with other parameters, focusing on controlled and balanced adjustments. Initially, a slightly lower thrust force might be beneficial to prevent cutter overload and premature wear. Fractured rock is already weakened, so excessive force could lead to the cutters impacting the rock too aggressively, reducing their lifespan. However, the *distributionof the thrust force across the cutterhead becomes more important. E....
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