ABSTRACT:

In order to improve accuracy of Physical Simulation Experiment (PSE), an approach with hybrid mechanical experiment on evaluation of mechanical response and Acoustic Emission (AE) signal characteristics of model materials employed in the PSE is one of the most significant techniques for optimization of PSE. This paper emphasized mainly on damage-mechanical properties of a specific model material for simulating coal-rock masses in the PSE, Porous Rock-like Composite Material (PRCM). We formed a real-time mechanical testing system which was composed with unconfined pressure equipment and AE monitoring in PRCM mechanical experiment. Crucial functional relationship between stress and strain would be described precisely. Also real-time damage characteristics of PRCM AE source location in various stress level were realized with analysis of AE data in the mechanical experiment. The results indicated that AE source location has a high consistency with damage fracture surface, and that damage process of PRCM which was similar to the process of coal-rock masses drilled from the site. According to AE data and mechanical response traits of PRCM in different stress levels were remarkable separately, which would be prerequisite to optimal design of PSE.

1 INTRODUCTION

Rock sample damage characteristics analysis method based on Acoustic Emission (AE) signal has significant advantages. It can be used to monitor damage characteristics of the research object in a long-term, continuous, real-time way (Cai et al. 2003, Zhao et al. 2002, Jiang et al. 2010). In particular, micro damage and tiny energy during the process can also be described precisely. Accurately damage evolution mechanism of model material can further improve the accuracy, reliability of PSE (Cai et al. 2002).

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