Determining rock crack stress thresholds using ultrasonic through-transmission measurements
Jiangwan He1
Mehdi Serati1
Martin Veidt2
Arthur De Alwis1
1.School of Civil Engineering,The University of Queensland,Brisbane,QLD 4072,Australia2.School of Mechanical and Mining Engineering,The University of Queensland,Brisbane,QLD 4072,Australia
摘要：The crack initiation stress threshold is widely used in excavation industries as rock spalling strength when designing deep underground structures to avoid unwanted brittle failures.While various strain-based methods have been developed for the estimation of this critical design parameter,such methods are destructive and often requires subjective interpretations of the stress-strain curves,particularly in rocks with pre-existing microcracks or high porosity.This study explore the applicability of non-destructive ultrasonic through-transmission methods for determining rock damage levels by assessing the changes in transmitted signal characteristics during loading.The change in velocity,amplitude,dominant frequency,and root-mean-square voltage are investigated with four different rock types including marble,sandstone,granite,and basalt under various stress levels.Results suggest the rate of signal variations can be reliably used to estimate crack closure and crack initiation stress levels across the tested rocks before failure.Comparison of the results between the conventional techniques and the new proposed methods based on ultrasonic monitoring are further discussed.
机标关键词：throughstressrockcrackdeterminingmeasurementsthresholdstransmission
论文发表日期：2024-04-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：14( 67-80 )
英文信息