Drilling stress meter for one-hole multiple measuring points

Abstract

The invention relates to a borehole stress meter which can measure stress in a plurality of points comprising a hydraulic oil cylinder and a pressure sensor. The hydraulic oil cylinder is arranged vertically and one side of the lower end of the hydraulic oil cylinder is communicated with a pressure signal sensitive end at one end of the pressure sensor and the other end of the pressure sensor is connected with a signal output pin; the other side of the lower end of the hydraulic oil cylinder is provided with a check valve supplying oil to the hydraulic oil cylinder and connected with an oil pipe. A plurality of borehole stress meters are arranged in preset positions in an installation guide track in sequence when installing and a general oil pipe is connected with all check valves of all borehole stress meters and can be sent into the borehole together with the installation guide track to ensure a sensitive piston keeping vertical to the level; the installation guide track is drawn back when reaching the preset positions; each pressure oil cylinder is greased with oil till the piston rises and well contacts with the top wall of the borehole and the borehole stress meter starts to work normally, realizing synchronous installation and test in a plurality of measuring points in one borehole.

Description

technical field [0001] The invention relates to the technical field of sensors for monitoring the stress of raw rock in mines, in particular to a rock formation drilling stress gauge which can be installed at one hole and multiple points during deep mining, specifically a drilling stress gauge for one hole and multiple points measurement. Background technique [0002] Underground mining in mines will cause changes in the stress field of the original rock, that is, mining will change the stress state of the original rock and form a new stress state. It is of practical significance to predict and evaluate the impact risk of coal strata from the perspective of stress field and to study the regional stress monitoring sensor of rock burst disaster in deep mining. Common borehole stress gauge products are all located at one point in one hole, and the prediction of the change law of the stress field in a large range of surrounding rocks requires monitoring the stress at multiple po...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a borehole stress gauge for multi-point measurement in one hole, which solves the problem that the existing one-point borehole stress gauge cannot perform multi-point measurement, the sensitive direction is inconvenient to be placed, and the sensitivity is not high, so that the stress field analysis is brought The problem of inconvenience is that the drilling stress gauge for multi-point measurement in one hole can be installed and tested at the same time in a multi-point measurement position, and it is only for the purpose of providing the hardware structure of the drilling stress gauge

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