Rectangular drilling stress monitoring device and method

Abstract

The invention provides a rectangular drilling stress monitoring device and method. The monitoring device comprises a rectangular drilling bit, a drilling pipe and a rectangular drilling stress monitor. The rectangular drilling bit includes an outer frame, and the outer frame is internally provided with forward cutters, diagonal cutters and a center guide cutter. The rectangular drilling stress monitor includes an upper cover, a lower cover, stress sensors and digital displayers. The monitoring method includes the steps of forming guide drilling holes in advance, forming rectangular drilling holes and installing the rectangular drilling stress monitor for monitoring. The monitoring device can effectively overcome the shortcomings that the test direction of traditional drilling stress gaugesis unclear and the test value is inaccurate, can accurately measure surrounding rock stress values at any angle in the vertical direction and the horizontal direction and can provide more reliable data for on-site mine pressure disaster prediction and forecast. The device and the implementation method provide a more reliable guarantee for monitoring of surrounding rock stress in coal mines in China.

Description

technical field [0001] The invention belongs to the field of mine pressure monitoring in coal mining, and in particular relates to a rectangular drilling stress monitoring device and a monitoring method. Background technique [0002] According to the research of the Chinese Academy of Engineering, it is estimated that by 2030, coal will still account for more than 50% of my country's primary energy consumption. Coal, as the main energy source in our country, occupies an important strategic position in the national economy. In the next few decades, the energy structure dominated by coal will be difficult to change. With the gradual depletion of shallow coal resources, coal mining has gradually expanded to deep areas. In the process of deep coal mining, the frequency of dynamic disasters such as rock bursts, coal and gas outbursts, etc. has gradually increased, posing new challenges to coal mine safety production. Stress is the fundamental force that causes deformation and fa...

AI Technical Summary

Problems solved by technology

[0003] 1. Cylindrical borehole stress gauges tend to rotate in any direction in circular boreholes, making it difficult to determine the direction of the measured stress

[0004] 2. It is difficult for the cylindrical borehole stress gauge to be in close contact with the borehole wall in all directions at the same time, and the force of the borehole stress gauge is uneven, which makes the stress measurement result have a large error

[0005] 3. Cylindrical borehole stress gauges are one point in one hole. When it is necessary to verify the measurement results at the same place, multiple borehole stress gauges need to be installed at the same place, and the utilization rate of boreholes is low.

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