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| | Abstract | | The hydraulic rock drill used for mountain tunnel construction is equipped with a damper that cushions the repulsive force from the ground with hydraulic damping pressure. Since the repulsive force varies depending on the hardness of the ground, it is considered that the damping exerted by the damper offers information such as the compressive strength of the ground at the drilling position. As a result of drilling experiment using specimens with known compressive strength, we confirmed that the pulsation amplitude of the damping pressure was an effective index for predicting the compressive strength of the ground. |
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