Attitude adjustable surrounding rock stress measurement device

Abstract

The invention discloses an attitude adjustable surrounding rock stress measurement device, which comprises a stress gauge body (1) and a display instrument box (2), wherein the stress gauge body (1) is in a cylindrical shape integrally, the top end of the stress gauge body (1) is configured into a conical structure, a pressure-bearing cavity is formed in the stress gauge body (1), and a pressure-bearing block (3), a circumferential rotation angle adjusting mechanism (4), a gravity sensor (5) and a quick connector (6) are arranged on the stress gauge body (1); and the display instrument box (2) comprises a controller, a display screen, a hydraulic pump station, a control valve bank, a circumferential rotation control circuit, a pressure-bearing block control loop and a stress numerical value acquisition and calculation loop. The attitude adjustable surrounding rock stress measurement device can realize the attitude adjustment of the stress gauge body in a drill hole, further realizes the effect of maximally reducing the measurement errors caused by drill hole deviation and axial deflection when a surrounding rock stress gauge is placed into the drill hole, achieves the precise measurement of surrounding rock stress, and is especially suitable for data acquisition and monitoring of coal mining stress.

Description

technical field [0001] The invention relates to a surrounding rock stress gauge, in particular to a position-adjustable surrounding rock stress measuring device suitable for underground coal mines, and belongs to the technical field of coal mine rock mass stress measurement. Background technique [0002] The measurement and application of in-situ stress has played an increasingly important role not only in structural geology, earthquake prediction and geodynamics research, but also in production practices such as mining, underground engineering and energy development. and engineering attention. [0003] For mining, excavating roadways and carrying out mining work is called mining of coal or surrounding rock. After mining, the stress balance state of the original rock mass is destroyed, causing the stress redistribution inside the rock mass, and the redistributed stress When the ultimate strength of coal and rock is exceeded, the coal and rock around the roadway or coal mini...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the mining stress is usually collected by drilling surrounding rock stress gauges, that is, after drilling a hole in the coal or rock mass where the stress is to be measured, the stress value is collected by installing a guide rod into the stress gauge, but the drilling is often due to Due to uneven drilling plane or uneven force during drilling, the drilling deviates from the predetermined direction. The deeper the drilling depth, the more obvious the deviation is, especially the inclined drilling with a certain angle with the horizontal plane is more difficult to ensure the drilling direction, which is extremely difficult. It is easy to cause the stress measured by the surrounding rock stress gauge to be not the stress in the required direction. The more the drilling direction deviates and the deeper the drilling depth is, the greater the error of the measured stress is, which easily leads to misjudgment due to numerical deviation; in addition, the traditional It is not easy to accurately ensure the position of the surrounding rock stress gauge during the process of placing it in the borehole. The deeper the borehole is, the more difficult it is to control the position change, which further leads to the difference between the force measurement direction of the surrounding rock stress gauge and the predicted direction. Deviation from the set direction causes stress data acquisition error

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