Coal mass strength distribution characteristic continuous detecting method and device

Abstract

The invention discloses a coal mass strength distribution characteristic continuous detecting method and device. The method includes the steps of connecting a short-circuit test element for detecting the torque, drilling pressure and drilling depth of a real-time detection drill bit between the drill bit and a drill stem, recording and storing the detected torque, drilling pressure and time signals of the drill bit through the short-circuit test element, converting the torque, drilling pressure and time signals into vibration signals or electromagnetic signals, transmitting the vibration signals or electromagnetic signals to a signal receiver, conducting analysis through a signal processor to obtain a depth-torque curve and a depth-drilling pressure curve, and conducting comprehensive comparing and analyzing on the real-time curves and information stored in the short-circuit test element to obtain coal mass strength distribution characteristics. By means of the method and device, the current situations that underground coal mine coal mass strength testing complexity is high, advanced detection is difficult, and test results can hardly meet prediction requirements are broken through, the coal mass strength distribution characteristic continuous detection in the drilling process is achieved through drilling information, and the method is easy and convenient to implement, scientific in test principle, accurate in result, intelligent, efficient, advanced and practical and has great application prospects in the technical field of mine dynamic disaster forecasting and early warning.

Description

technical field [0001] The invention relates to the technical field of mine dynamic disaster prediction and early warning, in particular to a method and device for continuous detection of coal strength distribution characteristics. Background technique [0002] In recent years, with the increase of mining depth, the underground pressure of coal mines has been increasing, and the pressure and content of mine gas have gradually increased. Many mines have been upgraded to rock burst mines and coal and gas outburst mines, and dynamic disasters have occurred frequently. The occurrence of dynamic disasters such as rock burst and outburst is not only significantly affected by in-situ stress, but also closely related to the physical properties of the coal itself, such as the strength, softness and hardness. The strength properties and changes of the coal body affect the possibility of dynamic disasters such as outburst and rock burst, and are one of the important parameters for pred...

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Problems solved by technology

Existing technologies and methods for testing coal strength during underground drilling in coal mines are still immature. Wang Kai and Yu Qixiang proposed to use drilling power to detect coal strength. Drilling power is greatly affected by various factors. Its reflection of coal strength is not accurate, and it has not been widely used in underground; Zhu Liyuan, Li Zhonghua, etc. proposed a cuttings torque detection method, which detects the torque delivered to the drill pipe by the drilling rig, and its impact on the drill bit The reflection of the strength of the coal body needs to be further verified

Based on the current domestic situation, the real-time continuous testing of coal strength during the drilling process in coal mines is not yet mature, and it is difficult to apply it in underground coal mines. A scientific and accurate method is urgently needed to continuously detect the distribution characteristics of coal strength. So as to better serve the prediction and prevention of dynamic disasters in coal mines

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