Modeling of Acoustic Emission Response Characteristics of Loess Collapse Geohazards under Different Water Content Conditions
In order too effectively mitigate losses induced by loess collapse which is normally characterized by suddenness,conceal-ment,and difficulty in capturing precursor information,the investigation into new methods for monitoring of loess collapse holds great engineering and scientific significance.There still remains a lack of a reliable theoretical and/or practical basis for the application of acoustic emission technology in monitoring and early-warning of loess collapse,while this technique has been found successful rock slopes.The single side connected loess slope model tests with water contents of 3％,7％and 10％were conducted.The tests were complemented by employing active waveguide method for real-time acoustic emission monitoring in order to explore the acoustic emis-sion response characteristics during the process of loess.The destructive form of loess collapse and the time-sequence evolution of acoustic emission counts in the deformation and destruction process were also analyzed.The results indicate that the failure pattern of loess slope model with 3％or 10％water content is dominated by local collapse of small pieces.On the other hand,the failure pattern of loess model with 7％water content is dominated by the overall collapse of large pieces.With deformation,the value of acoustic emission events also increased.As the acoustic emission counts increased rapidly before the overall failure,the initial point can be re-garded as a precursor of loess collapse.
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