Spatial pre-embedded type three-dimensional stress monitoring system and method for underground coal and rock mass

Abstract

The invention provides a spatial pre-embedded type three-dimensional stress monitoring system and method for underground coal and rock mass and belongs to the technical field of coal and rock mass safety. The system is characterized by comprising an inductive output device (3) fixed in the coal and rock mass (1), the inductive output device (3) at least comprises a stress induction module (12), a stress detection unit for detecting three-dimensional stress of the coal and rock mass (1) is arranged in the stress induction module (12), and output signals of the stress detection unit are led out by a signal line (6). The method comprises a stress monitoring process and a temperature compensation process performed before the stress monitoring process. According to the spatial pre-embedded type three-dimensional stress monitoring system for the underground coal and rock mass, the stress in three directions of the coal and rock mass can be detected, the pressure coming direction and the size of the stress of the coal and rock mass are judged more accurately, and accordingly, the safety of underground construction is improved.

Description

technical field [0001] An underground coal and rock mass space pre-buried three-dimensional stress monitoring system and a monitoring method belong to the technical field of coal and rock mass safety. Background technique [0002] In-situ stress is the natural stress in the formation that has not been disturbed by engineering, also known as initial stress, absolute stress or original rock stress. The construction of underground projects such as coal mines will cause the redistribution of original stress, and the redistributed stress is called secondary stress and secondary stress. In-situ stress is a necessary prerequisite for scientific design and decision-making of ground and underground geotechnical engineering, and secondary stress is of great significance for understanding the stress distribution in the construction range of underground engineering and controlling dynamic disasters (such as rockburst, rock burst) in underground engineering . The causes of in-situ stre...

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Problems solved by technology

It is difficult to control the on-site filling of liquid inside this type of device, and the filling oil pipe is easily damaged, resulting in failure of stress monitoring. After installation, this type of stress monitoring device cannot be well coupled with the installation drilling hole in the coal and rock body in time, and there is a gap between the device and the hole wall. As a result, the monitoring data is inaccurate, and only unidirectional relative stress can be monitored, and the purpose of real-time monitoring of the three-dimensional stress state of the coal and rock mass cannot be realized, so that the direction and the exact magnitude of the incoming pressure in the coal and rock mass cannot be accurately judged. Provide basic data support for advanced prevention of dynamic disasters

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