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Method for radon gas release concentration in-situ determination in underground different position coal rock beds

A determination method and technology for coal and rock formations, which are applied in the field of in-situ determination of radon gas evolution concentration, can solve the problems of inability to verify and perfect the theoretical derivation results, large differences, etc., and achieve wide practicability and popularization. Effect

Active Publication Date: 2016-05-04
CHINA UNIV OF MINING & TECH
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Problems solved by technology

Due to the size effect and the influence of external environmental factors, the final measurement results are quite different from the actual situation on site, and it is impossible to verify and improve the theoretical derivation results.

Method used

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  • Method for radon gas release concentration in-situ determination in underground different position coal rock beds
  • Method for radon gas release concentration in-situ determination in underground different position coal rock beds

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Embodiment Construction

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0020] Such as figure 1 and figure 2 Shown, a kind of in-situ determination method of radon gas precipitation concentration in the coal strata of different layers underground, comprises the following steps:

[0021] a. According to the position of the existing exploration drilling hole 2 on the surface 1 of the working face, combined with the information of the geological profile of the working face, determine the coal strata of different underground layers that need to be measured for the concentration of radon gas precipitation, and number them respectively from top to bottom for L 1 ~ L n ;

[0022] b. After opening the continuous radon measuring instrument 7 and working for 1 hour, automatically calibrate the determination coefficient of the continuous radon measuring instrument 7 according to the on-site air pressure and temperature and humidity con...

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Abstract

Provided is a method for radon gas release concentration in-situ determination in underground different position coal rock beds. The method comprises steps: determining underground different position coal rock beds for radon gas release concentration determination, and respectively numbering as L1 to Ln; automatically calibrating a determination coefficient of a continuous radon measurement instrument (7); fixedly arranging a cylindrical hollow rubber piston (3) on the end of a plastic flexible pipe (4), putting the cylindrical hollow rubber piston in an exploration drilling hole (2); when measuring the radon gas release concentration in the L1, recording data after measurement of each hour, continuously measuring for 3 hours, to record obtained three pieces of data respectively as C11, C12, and C13, taking the average value of the C11, C12, and C13 as the radon gas release concentration in the L1, recording as C1; measuring the L2, L3, and the like, Ln in sequence, and respectively recording the final measuring result as C2, C3, and the like, Cn. Using the method, radon gas release concentration determination of all position coal rock beds can be completed in the existing exploration drilling hole, interference on measuring results by size effect and external environment factors is eliminated, and field in-situ determination is actually realized.

Description

technical field [0001] The invention belongs to the technical field of underground coal mining, and in particular relates to an in-situ measurement method for the concentration of radon precipitation in coal strata of different underground layers, which is mainly applicable to different underground layers of shallowly buried deep coal strata and a single layer thickness greater than 0.5m in western my country in coal rock formations. Background technique [0002] Radon gas is a colorless, odorless, natural radioactive rare gas, which is difficult to be noticed by people. Long-term inhalation of radon gas will cause harm to human health. People are used to calling radon gas an "invisible killer". Radon is widely distributed in the earth's crust, its activity is very strong, and it has good migration ability under natural conditions. In the geological environment, in addition to migrating in gaseous form, it can also migrate with groundwater and soil water in a dissolved state;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/08
CPCE21B49/08E21B49/081E21B49/084E21B49/0875
Inventor 张炜张东升吴立新刘洪林李娟娟王宏志
Owner CHINA UNIV OF MINING & TECH
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