Monitoring and forecasting method and device for water bursting hazards on roof and floor of coal working face

Abstract

The invention discloses a monitoring and forecasting method for water bursting hazards on the roof and floor of a coal working face. The method comprises the steps that electrodes are arranged in drilled holes as power supply and measurement electrodes, and two infinite electrodes are arranged in roadways as auxiliary power supply and measurement electrodes, so that a power supply and measurement system is formed; the power supply electrodes feed direct currents into strata to establish an artificial electric field, and the other electrodes in the drilled holes in the same stratum measure potential simultaneously; the power supply electrodes are changed, potential measurement is repeated until all the electrodes complete power supply, and one-time monitoring measurement is completed; when coal mining is not started on the coal working face, the obtained potential serves as a background value; in the working face mining process, stress of the strata changes, cracks are generated to form water migration pathways, distribution of equipotential surfaces of a point power supply field will be changed, and information of water bursting around the drilled holes is obtained by monitoring the change. The invention further discloses a monitoring and forecasting device. By the adoption of the monitoring and forecasting method and device, change of geoelectric features around the drilled holes can be monitored in real time.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration, and in particular relates to a monitoring and forecasting method and device for water inrush disasters at the roof and floor of a coal mining face. Background technique [0002] Coal resources are one of the main energy sources in my country. With the renewal of mining equipment and the increase of mining volume, the mining depth of mines is gradually increasing, and the threat of high-pressure water from the aquifers on the top and floor of coal seams is also increasing. The impact on the working face Safe mining and miners' life safety is a potential danger. [0003] Coal seam roof water includes goaf water in the upper coal seam and water in the aquifer. The upper goaf water can be judged according to the relevant data and released in advance. , the development of fissures, and supply sources are closely related. Long-distance roof water, because of its long distance, is very ...

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Problems solved by technology

The invention still needs to drill a hole to the position where there is water, or the water inrush must flow through the hole, otherwise the monitoring will fail; Cheng Jiulong applied for an invention patent named "Mine Water Inrush Prediction System Based on Information Fusion" in 2006, The invalidation was terminated due to non-payment; Yin Shangxian of North China Institute of Science and Technology applied for an invention patent named "Mine Water Inrush Disaster Monitoring and Early Warning System and Control Method" in 2009. holes, respectively bury water temperature sensors, water pressure sensors, stress sensors, strain sensors, and displacement sensors to form an in-situ measurement subsystem, and import the data into the preset early warning mode and display them in the form of graphic curves and numbers. Alarms will be sent out in various ways such as images, sounds, and mobile communications; in 2009, Liu Shengdong, Wang Bo, etc. did "Experimental Research on Mine Water Hazard Early Warning Based on Geoelectric Field Response in Groundwater Seepage", and established a seepage-electrical measurement model. The electric field parameter test was collected during the process. Based on the characteristics of the isochrone of potential and current and the isochrone of apparent resistivity, it was found that the natural electric field showed an upward trend in the time and space domain during the seepage process, and the extreme point of the isochrone of natural potential indicated Seepage position, and has advanced sensing ability. In the actual application process, the measuring electrode is arranged in the roadway, and the monitoring cannot be realized when the water outlet lags inside the working face during mining. In addition, when the outlet water pressure is high, the water flow rate is too high. Greatly reduced, not even in time for warning

[0006] The catastrophic accident of water inrush is an obstacle to the construction of safe, high-yield, and efficient mines. Although many scholars have made unremitting efforts in this regard, and according to different situations, they have proposed various prevention and control measures and water inrush prediction theories. As far as its theory itself is concerned, it is relatively complete, but its application value is limited, especially for a wide variety of parameters, which may not be obtained or difficult to reflect the actual situation in engineering, which brings difficulties to field applications, and some even cannot use

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