AN EXPERIMENTAL RESEARCH INTO DETERMINATION OFHIGHEST PALEOTECTONIC STRESS STATE EXPERIENCEDBY ROCK THROUGH GEOLOGICAL AGES
Abstract：Until now there has been no perfect method for the determinationof three-dimensional paleotectonic stress field. In this paper, a new method for this determination is shown in the following steps: Firstly, rock specimens are drilled in six or more different directions out of the large rock cores or fresh rock blocks in the testing site. For each direction, ten or more specimens should be obtained. Secondly, the maximum principal stresses of the main tectonic movements experienced by the rock specimens to be measured are determined by means of the “Acoustic Emission Incomplete Erase Phenomenon in the General Sense”. Thirdly, the maximum principal stress value (σmt) of the highest paleotectonic stress state left in the rock specimens is obtained via statistical analysis. It has been found that the rock specimens still contain the normal stresses (σmn) induced by the highest paleotectonic stress state in different sampling directions. However, these normal stresses are hidden between the maximum main stress values induced by the relatively low paleotectonic stress states in different phases, so that they are not easy to differentiate from each other. In this paper, these hidden normal stresses σmn can be located by means of the “AE inversion searching method” with σmt as a target. Therefore, the highest paleotectonic stress state experienced by the rock specimens can be calculated. The feasibility of this new method has been confirmed by a simulation experiment in the pseudo-plane stress state.
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Publication Date：2001-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 99-104 )