A method and device for continuous detection of coal strength distribution characteristics

Abstract

A method and device for continuous detection of coal strength distribution characteristics. By connecting a drill bit and drill pipe with a test short-circuit element for real-time detection of drill bit torque, bit pressure and drilling depth, the test short-circuit element will detect the drill bit torque , weight-on-bit and time signals are recorded and stored in real time, and converted into vibration or electromagnetic signals and transmitted to the signal receiver, and finally analyzed by the signal processor to obtain the "depth-torque" curve and "depth-weight-on-bit" curve, comprehensive comparative analysis real-time The information stored in the curve and the shorting element yields a coal strength distribution characteristic. The present invention breaks through the current situation that the underground coal body strength test is complicated and difficult, the advanced detection is difficult and the test results are difficult to meet the prediction requirements, and the continuous detection of the coal body strength distribution characteristics in the drilling process is realized by using the drilling information, and the method is simple and convenient , the test principle is scientific, the result is accurate, intelligent and efficient, advanced and practical, and has a good application prospect in the field of mine dynamic disaster prediction and early warning technology.

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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