Coal-rock mass ground stress distribution feature detection method and coal-rock mass ground stress distribution feature detection device
A technology of distribution characteristics and detection devices, which is applied in the directions of measurement, earthwork drilling, borehole/well components, etc., can solve the problems of small single detection range, laborious, time-consuming, etc., and achieve wide practicability, simple method and simple device Effect
Inactive Publication Date: 2015-09-16
SHANXI LUAN ENVIRONMENTAL ENERGY DEV +1
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Problems solved by technology
[0003] Technical problem: The purpose of this invention is to solve the problem that in the current ground stress testing technology, the detection range of the surrounding rock stress distribution characteristics of the roadway or mining face is small, and it needs to be carried out many times to realize regional large-scale detection, which is laborious and time-consuming To solve the problem, provide an easy-to-operate method and device that can complete regional detection of surrounding rock stress distribution characteristics at one time
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[0018] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:
[0019] Such as figure 1 As shown, the method for detecting the stress distribution characteristics of coal and rock masses of the present invention is based on the amplitude of the sound wave, the frequency spectrum and the structure and stress state of the rock. When the stress is reduced, the sound wave will correspondingly produce changes in wave velocity and amplitude reduction. The specific operation steps are as follows:
[0020] a. Construct two equal-length and parallel boreholes 6 in the coal formation at the point to be tested in the downhole, and the vertical distance between the two boreholes 6 is 5-15m;
[0021] b. In advance, set a transmitting transducer 2 at a distance L2 of 0.5 to 1 m in a hard tube 4 equal to the length of the borehole 6, and install a transmitting transducer 2 in another hard tube equal to the length of the borehole 6 I...
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The invention provides a coal-rock mass ground stress distribution feature detection method and a coal-rock mass ground stress distribution feature detection device. Two parallel drill holes with the same length are constructed into a coal-rock layer in an underground point to be tested; a plurality of transmitting transducers are arranged at intervals in the middle of one drill hole; a plurality of receiving transducers are arranged at intervals in the middle of the other drill hole; signals are converted into ultrasonic waves through the transmitting transducers; the ultrasonic waves are transmitted to the corresponding receiving transducers by using a coal-rock mass as a medium; the receiving transducers convert the received ultrasonic waves into electric pulses; the electric pulses are transmitted back to a signal receiver arranged in a signal transmitting and sending control host through a cable; the ground stress distribution features in the coal-rock layer in front of a working face or roadway surrounding rock are subjected to regional detection; the located position of the ground stress peak is clearly defined; during the mining operation, the ground stress concentration region can be avoided, or the prevention measure can be taken in time; important significance is realized on underground impact ground pressure occurrence prevention and mining working face coal and gas outburst danger prediction; and the large-scale regional ground stress distribution detection can be completed in one step.
Description
technical field [0001] The invention relates to a method and a device for detecting the distribution characteristics of stress in a coal rock mass, in particular to a method and a device suitable for detecting the distribution characteristics of the stress around a coal mine underground roadway or in front of a working face. Background technique [0002] With the increase of coal mining depth in my country, the impact tendency of coal seams and surrounding rocks is enhanced, and rock burst disasters are very likely to occur in high ground stress areas of shafts or working faces, and it is easy to induce coal seams with outburst risks to occur. The outburst of gas poses a great threat to the safe production of coal mines and the life safety of the majority of coal mine workers. We know that the stress distribution state of the coal and rock mass around the shaft or working face is closely related to the occurrence of rock burst. Coal and gas are prominent. Therefore, it is o...
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IPC IPC(8): E21B49/00E21B47/00
Inventor 杨威王彦凯茅献彪王东飞王伟林林柏泉乔时和
Owner SHANXI LUAN ENVIRONMENTAL ENERGY DEV