Well-ground combined detection method for multilayer mined-out ponding area

Abstract

The invention discloses a well-ground combined detection method for a multilayer mined-out ponding area. The method is combined application of a ground electrical method and an underground electricalmethod. The method comprises specific implementation steps of firstly, determining electrical methods such as a ground transient electromagnetic method, an underground transient electromagnetic method, a ground induced polarization method and an underground induced polarization method; secondly, calculating connectivity of a coal seam multilayer goaf according to geological data of a detection area and the coal seam mining record; designing a combination form of the electrical method according to the connectivity calculation result; then performing underground and ground electrical method survey line arrangement and underground transient electromagnetic method detection direction design; and finally, performing data acquisition, data processing and comprehensive explanation. The method isadvantaged in that layered identification and accurate detection of the multilayer mined-out water accumulation area can be realized, multiplicity of solutions of a common electrical method is reduced, accuracy of the prediction result is improved, the position of a drainage hole and a drilling target are optimized, the drainage effect is improved, and safe production of a coal mine is guaranteed.

Description

technical field [0001] The invention relates to a well-ground joint detection method for a multi-layer goaf water accumulation area, in particular to ground and downhole transient electromagnetic method detection technology and ground and downhole induced polarization method detection technology; it is mainly used in overlying multi-layer goaf Applications in the field of detection of waterlogged areas. Background technique [0002] The accumulation of water in the goaf is one of the main reasons for the large water inrush accidents in coal mines in my country. When coal mines are mined layer by layer from the shallow to the deep, the goaf in the upper coal seam often becomes a water accumulation area, which will bring safety hazards to the production of the lower coal seam. The detection of multi-layer mined-out water accumulation areas has become an essential work for coal mine water prevention and control. [0003] At present, domestic and foreign coal mine goaf water d...

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Problems solved by technology

[0004] (1) At present, the most widely used method is ground transient electromagnetic method or downhole transient electromagnetic method. Due to the single method, the multi-solution problem of the results is serious, and the low-resistance anomaly area is explained too much and too large, and the accuracy of mine verification is low. lower;

[0005] (2) When the terrain is complex, it is difficult to solve the topographic correction problem of ground DC resistivity bathymetry and electrical profile method, and the topographic correction of ground transient electromagnetic method is not complete, resulting in misinterpretation and missing interpretation of interpretation results;

[0006] (3) When there is interference such as high-voltage lines on the ground, the data collected within the interference range will be distorted, which will affect the data quality and interpretation results of the ground DC resistivity sounding method, induced polarization method, transient electromagnetic method and other electrical methods;

[0007] (4) When there are multiple layers of mined-out water areas, the detection effect of the ground transient electromagnetic method is significantly affected by the low-resistance shielding effect of the uppermost layer of mined-out water areas. Difficult to determine;

[0008] (5) When the underground transient electromagnetic method is used for construction, the detection effect is affected due to the complex electromagnetic environment in the roadway; when the transient electromagnetic method is used to detect multi-layer goaf ponds upwards, the detection effect is affected by the lowest layer of goaf ponds. The influence of low resistance shielding effect is obvious

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