Combined effects of temperature and axial pressure on dynamic mechanical properties of granite

作     者：Tu-bing YIN Rong-hua SHU Xi-bing LI Pin WANG Long-jun DONG 尹土兵;舒荣华;李夕兵;王品;董陇军

作者机构：School of Resources and Safety Engineering Central South University Changsha 410083 China 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2016年第26卷第8期

页      面：2209-2219页

核心收录：

学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Project(51304241)supported by the Youth Project of National Natural Science Foundation of China Project(2014M552164)supported by Chinese Postdoctoral Science Foundation Project(20130162120015)supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China 

主　　题：rock dynamics split Hopkincon pressure bar temperature pressure coupling dynamic mechanical properties 

摘      要：In order to get the dynamic mechanical properties of deep rock mass suffered both high temperature and high pressure,impact loading experiments on granite subjected to temperature and axial pressure were carried out. Furthermore, the internalstructure characteristics of granite under different temperatures were observed by scanning electron microscopy (SEM). The results show that the longitudinal wave velocity assumes a downward trend which shows a rapid drop before falling slowly as the temperature increases. The uniaxial compressive strength of the specimen decreases significantly at temperatures of 25?100 °C compared to that at temperatures of 100?300 °C. The peak strain rises rapidly before the dividing point of 100 °C, but increases slowly after the dividing point. The internal structure of the rock changes substantially as the temperature increases, such as the extension and transfixion of primary and newborn cracks. In addition, the thermal damage under axial pressure is greater than that described by the longitudinal wave velocity and the phenomenon shows obviously when the temperature increases.