ABSTRACT
Currently, there are a large number of research results about acoustic emission features of rock under uniaxial load. Zhao Xing-dong et al. (2006) studied the AE signature of lamprophyre during the whole failure process under uniaxial loading, and analyzed the change and development regularity of the internal crack of granite. Li Shu-lin et al. (2004) obtained the AE characteristics of different kinds of rocks under uniaxial load. Xu Jiang et al. (2008) discussed the effecting factors of AE loading experiment of sandstone. Wang En-yuan et al. (2004) analyzed spectrum characteristic of
1 INTRODUCTION
With the improvement of coal production and the increase of mining depth, many fully mechanized working faces which are more 20 m extra thick coal seam were carried out. In this case, however, the phenomenon that the coal and rock strata of many mining areas are largely permeated by lamprophyre is found, such as Datong mining area, Shuozhou mining area, Huainan mining area, Xuzhou mining area (Zhou 2010). Especially the phenomenon of Tashan mining area is obvious. It not only lead to local thermal metamorphism of coal seam but also destroyed the structure of coal and rock. What is more, it has a great impact on the entry arrangement, working face and the maintenance of the roof (Huang 2011). Be found in the production practice of Tashan mine, the support working resistance that was selected through the traditional theory of mine pressure and was greatly increased in full-mechanized caving face in Tashan still cannot meet the requirements (Fang 2004). As a result, it often appear crushing during coal mining. So it is in urgent need of the basis of relevant theories to guide the production practice. But the study about lamprophyre is very few at present.
