Method for detecting conduction of overlying rock strata crack based on isotope identification

A detection method and isotope technology, applied in the direction of construction, etc., can solve the problems of detection of overlying rock fissure conductivity, complex data interpretation, low detection accuracy, etc., and achieve the effects of easy detection, simple data collection, and high detection accuracy

Active Publication Date: 2015-11-04
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

[0009] In order to overcome the limitations of existing point observation methods that cannot fully and accurately detect the continuity of overlying rock fissures, and at the same time solve the shortcomings of geophysical detection methods such as complex data interpretation, low detection accuracy, and high construction requirements, the present invention provides an isotope-based Marked Overburden Fracture Continuity Detection Method

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  • Method for detecting conduction of overlying rock strata crack based on isotope identification
  • Method for detecting conduction of overlying rock strata crack based on isotope identification
  • Method for detecting conduction of overlying rock strata crack based on isotope identification

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Embodiment Construction

[0042] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0043] The thickness of the 11# coal seam in a mine is 8.5-12.8m, with an average of 10.25m. The immediate roof is mudstone with poor water permeability and is a stable water-resisting layer with a thickness of about 20.3m; the basic roof is coarse sandstone and sandy mudstone with well-developed fissures and abundant fissure water, with a thickness of about 28.7m. There are several layers of stable aquifers above the basic top, which are rich in fissure water. Sandy mudstone and argillaceous siltstone are between each aquifer, which blocks the hydraulic connection between the aquifers. The inclination length of the working face is 158.6m, and the strike length is 1285m. The fully mechanized caving mining method is adopted, the mining height is 3m, and the coal caving height is 6.8m.

[0044] In order to detect the fracture conductivit...

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Abstract

The invention discloses a method for detecting the conduction of an overlying rock strata crack based on isotope identification. Different aquifer water is effectively identified by adding different isotope identifier, Conduction of water into working faces is determined by millesimal discrepancy of identifying isotopes in drained water of each aquifer and working face, and the conduction of overlying rock strata crack is determined according to conduction of water of each aquifer into the working face. The method overcomes the defects of conventional indirect method, eliminates error of this type, and provides accurate basis for flood damage control of a working face.

Description

technical field [0001] The invention relates to the technical field of crack detection in overlying rock in coal mines. Background technique [0002] The underground mining of coal mines causes the redistribution of the stress field and deformation field of the surrounding rock mass, resulting in different degrees of damage to the overlying strata. From the bottom to the top, there are caving zones, water-conducting fissure zones and bending subsidence zones. The zone and the hydraulic fissure zone are good channels for water. When there is a water-rich layer above the coal seam, whether the overlying rock fissures penetrate the aquifer directly determines the safety of the working face. Therefore, accurately grasping the conductivity of overlying rock fractures is an important theoretical basis for judging the occurrence conditions of mine water inrush, predicting mine water inrush, and formulating mine water disaster prevention and control countermeasures. [0003] On-si...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/11
Inventor 刘学生谭云亮宁建国田成林顾清恒史新帅胡浩
Owner SHANDONG UNIV OF SCI & TECH
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