A vibrating wire three-dimensional stress sensor for deep hole stress measurement

Abstract

The invention discloses a vibrating wire type three-dimensional stress sensor for deep hole stress measurement, which includes a support body, on which installation grooves are arranged, and sensing units are arranged in the installation grooves, and the sensing units include indenters, One end of the indenter is provided with a slider, and the other end is provided with a force transmission head. The force transmission head is connected to the middle part of one side of the elastic beam. They are respectively connected with the induction coil through steel strings. The invention realizes the transformation of the traditional pressure sensor from unidirectional pressure measurement to three-dimensional stress state measurement, making rock and soil body stress measurement more scientific and comprehensive. Not only can the normal stress under the compression state be measured, but also the normal stress under the tension state can be measured. Good sealing and high measurement accuracy.

Description

technical field [0001] The invention belongs to the field of geotechnical stress monitoring, in particular to a vibrating wire three-dimensional stress sensor used for deep hole stress measurement. Background technique [0002] Obtaining accurate geotechnical stress monitoring data is an important prerequisite for determining the mechanical properties of engineering rock mass and soil, analyzing and evaluating the stability of geotechnical engineering, and realizing scientific excavation design and decision-making in geotechnical engineering. [0003] At present, the common stress sensors in geotechnical engineering mainly include vibrating wire type, fiber grating type, resistance strain type, hydraulic type, etc. It has been widely used in pressure monitoring and other fields. However, limited by the technical level, most of the sensors used in geotechnical engineering stress monitoring are unidirectional pressure sensors, that is, they can only obtain the compressive str...

AI Technical Summary

Problems solved by technology

However, limited by the technical level, most of the sensors used in geotechnical engineering stress monitoring are unidirectional pressure sensors, that is, they can only obtain the compressive stress in one direction.

To obtain the three-dimensional stress state of rock and soil, only six sensors with different measurement directions can be buried at the monitoring position, which is very troublesome to implement, and in many cases it cannot be implemented at all

In addition, due to the complex and changeable stress state in rock and soil, compressive stress will turn into tensile stress in many cases, and the current sensors cannot monitor the tensile stress of rock and soil

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