AE CHARACTERISTICS OF ROCK FRACTURE PROCESS UNDER UNIAXIAL COMPRESSION

摘要

During the grinding test, the formation environment and the mineral composition of a typical rock have been analyzed. The results confirm the relationship of the rock strength with its mineral content. Furthermore,AE is carried out during the uniaxial compression tests . The AE process is examined during the rock instability and rupture. The AE results are used to analyze the crack propagation with time,stress and strain. The results reveal that AE activities substantially follow the. same patterns. There is an obvious point of AE enhancement. These results are useful for the analysis of rock fracture instability mechanism. AE ring count rate of rock failure process is suitable for predicting for all stages of the rock breakdown. The relations of rock stress-strain are in the forms of polynomials of second orders, The relations of Strain-the cumulative number of AE are in the forms of polynomials of third orders. It will help us to better understand the failure mechanism and the precursor of rock failure criterion.