Integrated monitoring technology of water inrush from coal seam floor and its application

DUAN Jianhua1

(1.Xi’an Research Institute Co., Ltd., China Coal Technology and Engineering Group Corp., Xi’an, Shaanxi Province, China 710077)

【Abstract】Karst water damage in floor is common in North-China-type coalfield. Because of its concealment and emergency, the prevention and control of water is faced with huge challenges, and monitoring and early-warning technology of floor water inrush has become a necessary measure in the process of the safe production in coal mines. The formation and occurrence of floor water disasters have a process of evolution from conception to development and then to occurrence. In this process, the corresponding water inrush symptoms will be released in different stages of the floor fracture and apparent resistivity of the rock layer. Timely, accurate and effective collection of information can give the specific hydrogeological characteristics in the process of water inrush. It laid a foundation for the establishment of water inrush monitoring system. According to the three elements of water inrush, an integrated monitoring system of water inrush from the floor is built in the working face 11916 of the east mine of Gequan Coal Mine by well–ground–borehole microseismic monitoring and apparent resistivity monitoring. Real-time monitoring of water channels and water sources are carried out to provide a scientific basis for the prediction of water inrush from the floor. The monitoring results show that under normal conditions, the depth of floor damage to working face 11916 is 20–25 m. However, when the working face advanced to the middle roadway on September 14, 2019, the superposed pressure of the material haulage roadway and the middle roadway resulted in the increase in the floor failure depth at this location, reaching 30–35 m. Benxi limestone water from the floor entered the material haulage roadway through the water diversion channel, and the water output from the floor of the working face is 2 m3/h. In addition, from the monitoring results of apparent resistivity, we can see the development of a low resistivity anomaly from the bottom to the top. Research shows that the integrated monitoring system of water inrush from the floor, constructed by well–ground–borehole microseismic monitoring and apparent resistivity monitoring, can capture the symptoms of water inrush from the floor. It is of great significance and practical value to predicting serious water disasters.

【Keywords】 water inrush from floor; microseismic monitoring; apparent resistivity monitoring; Gequan Coal Mine;

【DOI】

【Funds】 National Key R&D Program of China (2017YFC0804103) Science and Technology Innovation Fund of CCTEG (2017MS007)

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(Translated by HAN R)

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This Article

ISSN:1001-1986

CN: 61-1155/P

Vol 48, No. 04, Pages 19-28

August 2020

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Article Outline

Abstract

  • 1 “Well–ground–borehole” microseismic monitoring
  • 2 Apparent resistivity monitoring
  • 3 General situation of east mine in Gequan Coal Mine
  • 4 Technical scheme for integrated monitoring of floor water disasters
  • 5 Monitoring results and analysis
  • 6 Results and discussion
  • 7 Conclusion
  • References