单轴压缩煤岩变形损伤及声发射特性研究

Study of Deformation-damage and Acoustic Emission Character of Coalrock under Uniaxial Compression

煤岩是一种具有内部结构的非均匀介质,在外载荷作用下,煤岩内部微缺陷的成核、扩展以及相互之间的作用决定了煤岩的宏观变形、破裂特性。为了更好地了解受载煤岩体的变形损伤规律,进一步揭示煤岩动力灾害演化过程及灾害发生机理,本文对煤岩单轴压缩变形损伤及声发射特性进行了研究,研究表明煤岩单轴压缩应力应变全过程可分为四个阶段,各个阶段的声发射不同,且不同于一般岩石的有关特性;煤岩的声发射特征能较好地描述其变形和损伤演化特性。

Coalrock is a heterogeneous medium. Under exterior load, the microdefect＇ s formation , expansion and interaction will decide coalrock＇ s macroscopic deformation and damage character. In order to explain coalrock＇ s deformation and damage rules under the load and demonstrate coalrock＇ s disaster dynamic evolutionary process and mechanism, the deformation-damage and acoustic emission character of coalrock under uniaxial compression was studied. The results demonstrated that ： 1） the complete stress-strain curve of coal rock under uniaxial compression could be divided into four parts and each phase＇ s acoustic emission character is different and the coalrock＇ s acoustic emission character is different from that of the general rock ;2 ） the coalrock＇ s acoustic emission character can demonstrate it＇ s deformation and damage evolutionary charater.