Voice frequency detection method for bearing pressure of coal wall
A support pressure and audio detection technology, which is applied in the direction of fluid pressure measurement using acoustic methods, can solve the problems of inability to measure the absolute value of support pressure, misjudgment of mine pressure conditions, and inability to obtain correct and effective control.
Inactive Publication Date: 2014-02-19
SHANDONG UNIV OF SCI & TECH
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[0004] However, these methods can only measure the relative increase or decrease of the stress after the installation of the instrument, and cannot measure the absolute value of the support pressure, so it is necessary to use the relative increase or decrease of the support pressure value to determine the mine pressure control effected by the absolute support pressure value. , often cause the mine pressure situation to be misjudged, and thus cannot be correctly and effectively controlled
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[0024] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of this application
[0025] The present invention is completed by the National Natural Science Foundation of China, the number is 51374137 project research; figure 1 As shown, an expansion audio detector used to monitor the absolute value of the support pressure of the coal mining face includes a hard liquid injection pipe 1, one end of the liquid injectio...
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The invention discloses a voice frequency detection method for bearing pressure of a coal wall. The method comprises the steps that firstly, a long hole containing the range of changes, from large to small, of the overall bearing pressure is drilled along the coal wall in front of a working face or the coal wall in the lateral direction of a roadway; an expansion voice frequency detector is arranged in the long hole; pressure is injected into the expansion voice frequency detector, and pressure injection pressure and voice frequency records are monitored; the detector expands outwards along with increasing of the injected pressure, and the hole wall cracks; the pressure injection pressure corresponding to the point is recorded, the pressure injection pressure is the bearing pressure of the measured point, then the pressure is released, and the next point is detected; finally, a bearing pressure distribution graph is drawn according to the detected bearing pressure. Compared with the prior art, the voice frequency detection method for the bearing pressure of the coal wall can obtain the absolute value of the bearing pressure directly and conveniently, and has the advantage of detecting the bearing pressure rapidly and accurately. The voice frequency detection method for the bearing pressure of the coal wall is searched by the project, with the serial number of 51374137, of the national science foundation of China.
Description
technical field [0001] The invention relates to an audio frequency detection method of coal wall support pressure. Background technique [0002] Abutment pressure is an important part of mine pressure and an important factor affecting the stability of working face and roadway. Mastering the distribution law of abutment pressure, including important characteristic parameters such as distribution range, peak position, and range of low pressure area, is the key to studying the mechanism of mine pressure and It is an important basis for finally realizing mine pressure control. [0003] Commonly used monitoring methods for bearing pressure include drilling hydraulic pillow method, drilling steel string dynamometer method and advanced roadway displacement method. [0004] However, these methods can only measure the relative increase or decrease of the stress after the installation of the instrument, and cannot measure the absolute value of the support pressure, so it is necessary...
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Inventor 代进蒋金泉
Owner SHANDONG UNIV OF SCI & TECH