ABSTRACT
In the filling mining method, as an important structural unit, the cemented filling body is acted as an important role in maintaining the stability of the underground ore stratum. So far, the studies regarding the cemented filling body are mainly
1 INTRODUCTION
With the increase of the mining exploitation depth, the underground pressure activity becomes more and more frequent. Therefore, it is important to predict and forecast the failure of the underground stratum and the main structural unit. The essence of the rock material failure is the process of energy dissipation and release. On the one hand, the dissipation of energy is the power of rock material failure. On the other hand, the release of energy is the immanent cause of rock material failure. And the phenomenon of acoustic emission is nothing but the quick energy release of the rock material failure. Chen (2001) studies the acoustic emission characteristics of the sandstone during the uniaxial compression process, and the results show that: the main parameters of the acoustic emission characteristics are apparently increasing when the stress is close to the peak stress. Sun (2012) concludes that the corresponding stress of the acoustic emission uprush point of the deep layered sandstone matches to the critical point of rock specimen. Miao (2009) conducts the uniaxial circulation of
concentrated on its mechanical property. But the response features during the fracture and failure of the cemented filling body is seldom reported. This article tells the conducting of an acoustic emission experiment of the cemented filling body, both with cement-sand ration 1:4 and 1:8, which is under the condition of uniaxial compression. To provide the prediction and forecast basis for the failure of the cemented filling body, according to the threshold theory and the analysis of the cemented filling body features, the experiment studies the change features of the response ratio before the failure of the cemented filling body.
