Method for measuring physical and mechanical parameters and stress state of underground coal and rock mass of coal mine while drilling

Abstract

The invention provides a method for measuring physical and mechanical parameters and stress states of coal and rock masses under a coal mine while drilling, which comprises the following steps of: acquiring parameters such as stress, drilling thrust, torque, rotating speed, acoustic emission, gas flow and the like in real time; a mathematical model is used for analyzing the parameters to obtain the three-dimensional stress state of the coal and rock mass in front of the drill hole, the cohesive force and the internal friction angle of the coal and rock mass and the hardness degree of the coal body, and therefore the purpose of rapidly and accurately obtaining the physical and mechanical properties and the stress state of the coal and rock mass in front of the drill hole in the drilling process is achieved. The invention further designs equipment capable of monitoring, transmitting and analyzing multiple parameters obtained in the drilling process in real time, and by means of the equipment, the coal rock mass property and the coal seam gas pressure in front of drilling can be rapidly and accurately obtained and transmitted to a ground early warning system in real time, so that a basis is provided for outburst prediction and early warning.

Description

technical field [0001] The invention relates to the technical field of measurement while drilling underground in coal mines, in particular to a method for measuring physical and mechanical parameters and stress states of coal and rock mass in underground coal mines while drilling. Background technique [0002] In order to effectively prevent the occurrence of gas dynamic disasters, high gas mines and coal and gas outburst mines need to construct a large number of boreholes for detection, prediction, and effect inspection in daily production work. The drilling process of these holes can be regarded as a miniature "roadway" construction, and the signals such as thrust, torque, and acoustic emission of the drilling rig during the drilling process are obtained and analyzed, and the coal ahead of the construction of these miniature "roadways" can be obtained. The physical and mechanical properties and stress state of rock mass and the change process of physical and mechanical pro...

AI Technical Summary

Problems solved by technology

[0006] 1. At present, the identification of geotechnical engineering geological interface and roadway surrounding rock characteristics based on drilling parameters has been well applied in shallow geotechnical engineering and coal mine roadway drilling. There is a lack of corresponding devices and methods for the change of coal body properties;

[0007] 2. The current common discrimination method of lithology change while drilling does not consider the impact of high-energy and high-pressure gas on the discrimination results

Images