NONDESTRUCTIVE TESTING OF ANCHORING QUALITY
锚固质量的无损检测技术

Based on dynamics of rock bolt and kinematics of stress wave in grouted bolt system,the vibration characteristics of grouted bolt system and energy attenuation of stress wave are studied. A method of quick inspection for anchoring state by using sonic-frequency stress wave is proposed. Also nondestructivedetermination of anchoring force by intersection of secant lines of the turning segment of a drawing curve is discussed. All results are confirmed by construction quality inspection for bolting in the first coal mine of Panji.