Abstract:

In Cook rigidity criterion, it is taken into account that the release of the elastic strain energy in test machine will affect the burst of the rock sample. On the other hand, the residual energy method based on the elastic energy exponent and the impact energy exponent takes the influence into account that the elastic energy stored in the rock acts on the burst of the rock sample. In view of the fact that the test machine and the rock interior releases the elastic energy respectively with the burst of the rock sample, it is suggested that both sides be combined, i.e. the influence exerted on the burst of the rock sample through the elastic energy releasing between the test machine and the rock interior be considered comprehensively, it is so-called the comprehensive rigidity and comprehensive energy criterion of the burst of rock. This can determine the position of starting point and end point of the burst of rock more reasonably, give the calculation relationship of the elastic energy releasing amount of the test machine-rock sample system (i.e. the general rock body system) with the burst of rock, and can express these relationships through geometry form.

Key words: rock, burst, elastic energy release, criterion