The experimental research of apparent resistivity, elastic wave and acoustic emission in the rupture process of large scale specimens and rock blocks in-situ

Abstract

Abstract This paper deals with observations and features of experiments of apparent resistivity (denoted by ϱ s ), elastic wave and acoustic emission in large scale concrete blocks (1.0 × 1.0 × 1.5 m 3 ) under the condition of triaxial stress, large scale granite rock specimens (1.0 × 1.0 × 0.85 m 3 ) in the process of slowly expansional rupture, and in rock blocks in-situ (in a mine tunnel) under the condition of local stress disturbance due to the mine excavation. The changes in apparent resistivity, elastic wave and acoustic emission and stress-strain measurements both in the stressed large scale specimen and in the rock block in-situ , could be divided into several stages which are associated with different features of deformation inside the specimens or rock blocks. All these results show the good prospects for applying these measurements to synthetic research on determining the mechanical properties of construction material and detecting the stability of concrete blocks in-situ such as in mine engineering. It is especially pointed out that the application of a specific loading source—the static burst agent in the experiment, makes it possible to do the loading test on large scale rock specimens and to understand its complex rupturing process of large scale rock specimens, which is very significant for research on earthquake mechanics and earthquake precursory mechanism as well as rock mechanics itself.