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Research on the RZB-Type Three-Dimensional Drilling Strain Measurement System
Zheng Chen1, Hong Li1, Yunkai Dong1
1National Institute of Natural Hazards, Beijing 100085, China.
Sensors (Basel, Switzerland)
|June 27, 2024
Summary
This study introduces an enhanced borehole strain gauge capable of measuring 3D crustal strains, including vertical and oblique components. Field tests confirmed its ability to accurately detect solid Earth tides, advancing geophysical and seismological research.
Area of Science:
- Geophysics
- Seismology
- Crustal Dynamics
Background:
- Existing borehole strain gauges primarily measure horizontal strains in vertical boreholes.
- Technical limitations hinder the measurement of vertical and oblique strains, crucial for understanding 3D crustal tectonics.
- Accurate 3D strain data is vital for geophysics and seismology due to complex geological structures and forces.
Purpose of the Study:
- To develop a novel borehole strain gauge system for comprehensive 3D strain measurement.
- To enhance existing horizontal-component gauges with bellows and line strain technology for vertical and oblique measurements.
- To enable simultaneous horizontal, oblique, and vertical strain measurements within a single borehole section.
Main Methods:
- Modification of a horizontal-component borehole strain gauge by integrating a bellows structure.
- Incorporation of line strain measurement technology to capture vertical and oblique strains.
- Deployment and testing of the enhanced system at the Gongxian seismic station.
Main Results:
- Successful measurement of solid Earth tides across horizontal, oblique, and vertical components.
- Observed tidal morphology and amplitude align with theoretical calculations.
- Achieved measurement sensitivity of 10^-10, meeting geophysical requirements.
Conclusions:
- The enhanced borehole strain gauge effectively measures three-dimensional strain states.
- This technology provides crucial data for geophysical, seismological, and crustal dynamics studies.
- The system enables a more comprehensive understanding of subsurface deformation and tectonic processes.
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