Method of detecting dynamic developmental situation of overburden mining-induce fissure in radon gas earth surface

Abstract

The invention provides a method of detecting the dynamic developmental situation of an overburden mining-induce fissure in a radon gas earth surface. The position of a boundary, corresponding to a working surface, of the earth surface is determined according to the geographic coordinates of the position of an underground working surface in combination with a surface-underground contrast plan of the working surface; measuring lines are arranged from the position of an open-off cut of the working surface in the direction perpendicular to the trend of the working surface within a measuring area range defined at the position of the boundary, and then measuring points are arranged on all the measuring lines; a probe cup of an emanometer is buried in soil on the earth surface at the measuring points in an inverted mode, the probe cup is taken out and placed into the emanometer for measurement four hours later, and a measurement result is stored in the emanometer after the measurement is completed; after the measurement at all the measuring points is completed, measurement data in the emanometer are uploaded to a notebook computer through a data line, and a radon gas concentration variation diagram of the measuring area is drawn. According to the abnormal characteristics of radon gas concentration variation of the measuring area, the dynamic developmental situation of the overburden mining-induce fissure is obtained through inverse analysis. The method is high in operability, low in cost, high in efficiency, and broad in practicability and popularization.

Description

technical field [0001] The invention relates to a method for detecting the dynamic development of overlying rock mining fissures, in particular to a method for detecting the dynamic development of overlying rock mining fissures on the surface of radon gas which is suitable for underground mining of shallow coal seams in western mining areas. Background technique [0002] The latest national coal reserve prediction results show that the geographical distribution of my country's coal resources presents an overall pattern of more in the west and less in the east, rich in the north and poor in the south, and are mainly distributed in six western provinces including Inner Mongolia, Shanxi, Shaanxi, Xinjiang, Guizhou, and Ningxia ( autonomous region), accounting for 82.8% of the country's total coal resources. In recent years, with the gradual depletion of coal resources in most of the central and eastern mining areas, the focus of my country's coal resource development has gradual...

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Problems solved by technology

Existing engineering detection methods not only have disadvantages such as large amount of installation work, complex operation, high cost, and difficulty in data acquisition, but also are easily affected by the support pressure of advanced mining, making it difficult to achieve full-scale monitoring and unable to fully reflect the entire mining process of the working face. It is impossible to accurately determine the dynamic development of mining fractures in the overlying rock, and it is even more difficult to determine whether they communicate with the upper loose aquifer, which seriously affects the effective implementation of safe and efficient mining technologies in mines

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