Behaviors of AE strain release under the different temperature and pressure condition:discussion on the physical meanings of ASR model parameter
不同温压条件下声发射应变能释放特征——加速模型参数物理含义的初步讨论

Using the data of granite deformation experiments under different temperature and confining pressure, the strain release features of AE events have been studied, and the relationship between m-value, the parameter of the accelerating strain release (ASR) model, with the temperature and pressure environmental condition have been discussed. In room temperature, the AE strain shows a certain ASR, but the m-value does not show the tendential variety, this expresses that the m-value does not interrelate to the rock strength tightly. When confining pressure be fixed, m-value increases with the temperature, and the AE strain release changes gradually from accelerating pattern to the linear pattern. This means that the different microfracture modes inside the rock sample during the process of the rock deformation under the different temperature condition probably leads to the different strain release pattern (i.e. different m-values). To simulate the temperature and confining pressure condition in different depths of the crust, a certain accelerating feature had been checked before the rock failure for shallow crust and m-value is smaller than 1. In progressive failure range of the crust, the strain shows a gradual decelerating release and m-value is greater than 1 obviously. For the HT-HP condition in deep crust, the accelerating feature is remarkable and m-value is very small. Besides, the rock status has a big influence on the m-value, the accelerating feature is obvious before the fracture of the symmetrical and integrated rock sample, but it is linear before the stick-slip of the rock sample with macro-cracks.