Method and system for continuous measurement of plane stress of crustal rock mass

Abstract

The invention provides a continuous measurement method and system of plane stress of earth crust rock mass. The method comprises steps of firstly, using a piezomagnetic sleeve core to determine the reference plane main stress of earth crust rock mass in a preset depth place of a target borehole and determine a second linear relation between second piezomagnetic sensing elements on a piezomagneticmonitoring probe; then, based on stress states of a piezomagnetic relieving probe in the preset depth place of the target borehole, adjusting stress states of the second piezomagnetic sensing elementson the piezomagnetic relieving probe in the corresponding positions; and finally, measuring the voltage drop of each second piezomagnetic sensing element on the piezomagnetic monitoring probe at anymoment after the adjustment and according to the reference plane main stress, the second linear relation and the current voltage drops, determining the current plane main stress. In this way, the absolute earth crust rock mass plane main stress at any moment in the preset depth place of the target borehole can be acquired in real time, and real-time monitoring of plane main stress in the preset depth of a certain target borehole in the earth crust rock mass is achieved.

Description

Technical field [0001] The invention relates to the technical field of rock mass in-situ stress measurement, in particular to a continuous measurement method and system for the plane stress of the crustal rock mass. Background technique [0002] At present, the crustal rock mass medium has many important characteristics that are different from other media. Factors such as the self-weight of the rock mass and the tectonic stress caused and preserved by the tectonic movement of the crustal plates cause the rock mass to have initial in-situ stress (or in-situ stress for short). One of the characteristic properties. As far as rock mass engineering is concerned, if the element of rock mass in-situ stress is not considered, it is difficult to carry out reasonable engineering parameter design analysis and draw practical conclusions. [0003] The on-site measurement of rock mass stress is to understand the magnitude and direction of the stress existing in the rock mass, so as to provide a...

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventor found that there are at least the following problems in the related art: in the related art, either the absolute plane stress of the crustal rock mass at a certain target position can only be measured, or the absolute plane stress of a certain target position can only be measured at any time. The change trend of the plane stress of the crustal rock mass (because the measured data cannot be effectively calibrated, the stress change trend is actually measured, and it cannot even be called the stress change accurately), it can be seen that there is no continuous measurement. Therefore, it is impossible to monitor the absolute plane principal stress of the crustal rock mass at any time at a certain target position in real time

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