Device and method for monitoring fault tectonic stress

Abstract

The invention relates to a method and device for monitoring fault tectonic stress. The method for monitoring fault tectonic stress comprises following steps: stress sensor installation, fault pre-fabrication, load application, critical stress of fault instability determination, theoretical value and experimental value comparison and analysis, and precursory information of fault instability acquisition; the device for monitoring fault stress comprises a fault analogue simulation test platform and a fault stress sensor. According to the device, by use of the stress sensor vertically installed on a fault surface, the normal stress and shearing stress of the fault surface are monitored; through the establishment of a fault dynamic module, the functional relations between the normal stress and shearing stress of the fault surface and horizontal load and vertical load are calculated; the errors between experimental values and theoretical values are analyzed; the critical stress value of fault instability is determined; the device and method provide theoretical basis and experimental data support for researching dynamic disasters such as rock burst and pressure bump caused by fault slip instability in study fields of geotechnical engineering and mining engineering, and provide pre-cursor information for predicting and preventing dynamic disasters.

Description

technical field [0001] The invention relates to the fields of geotechnical engineering and mining engineering, in particular to a monitoring device and method for fault structural stress. Background technique [0002] During the geological evolution of the earth's plate, a variety of fault geological structures have been produced, and the characteristics of these structures directly determine the occurrence conditions of mine geological disasters, and are also one of the main factors that induce rock bursts and rock bursts. In the field practice of geotechnical engineering and mining engineering, the intensity and frequency of dynamic disasters induced by sliding instability of unfavorable geological structures such as faults gradually increase, and the distribution characteristics of fault structural stress are the main parameters for studying fault sliding instability. [0003] At present, the study of fault tectonic stress is mainly done through laboratory tests and field...

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Problems solved by technology

[0004] The present invention provides a monitoring device and method for fault structural stress. The fault structural stress includes normal stress and shear stress on the fault plane. The technical problem to be solved is due to the sealing of the fault plane. It is very inconvenient to install the stress monitoring device. The sensors for monitoring the structural stress of the fault are generally arranged near the fault surface. The stress value monitored by the sensor is slightly lagging behind the sliding of the fault, and the normal stress and shear stress during the sliding of the fault cannot be accurately measured.

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