Method and apparatus for measuring volume of goaf by using gas concentration difference method
A technology of gas concentration and goaf, applied in the direction of volume measurement instrument/method, measuring device, measuring capacity, etc., can solve the problems of smaller volume of goaf, unsuitable for karst cavity, unable to accurately obtain the volume of goaf, etc. , to achieve the effect of improving budget accuracy, facilitating integration and promotion, and simple principle
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[0055] Example 1
[0056] The method for measuring the volume of the goaf using the gas concentration difference method of this embodiment includes:
[0057] Step 1: After determining the location of the mined-out area, drilling to obtain a borehole connected to the mined-out area;
[0058] Step 2: Use the concentration detection sensor to measure the original pre-selected gas concentration value ρ in the goaf 1 ;
[0059] Step 3: Connect the pre-selected gas storage equipment and inject the pre-selected gas into the goaf, record the mass of the pre-selected gas Δm and the concentration value ρ of the pre-selected gas in the goaf 2 ;
[0060] Step 4: According to the formula Obtain the goaf volume V x .
[0061] In specific implementation, the pre-selected gas in this embodiment is CO 2 gas.
[0062] In order to avoid harm to measurement personnel due to gas leakage, the preselected gas in this embodiment is CO 2 Gas and CO 2 Gas is also common in the goaf.
[0063] It should be noted tha...
Example Embodiment
[0072] Example 2
[0073] The device for measuring the volume of the goaf using the gas concentration difference method of this embodiment includes:
[0074] Concentration sensor, which is set in the goaf, used to detect the preselected gas concentration value in the goaf;
[0075] Connecting pipelines, which are used to connect pre-selected gas storage equipment and inject pre-selected gas into the goaf;
[0076] Weight measuring equipment, which is used to obtain the mass Δm of the preselected gas injected into the goaf;
[0077] The controller is configured as:
[0078] The receiving concentration detection sensor measures the original pre-selected gas concentration value ρ in the goaf 1 ;
[0079] The concentration value ρ of the preselected gas in the goaf when the preselected gas mass Δm is injected into the goaf 2 ;
[0080] According to the formula Obtain the goaf volume V x .
Example Embodiment
[0081] As an embodiment, the pre-selected gas is CO 2 gas.
[0082] In order to avoid harm to measurement personnel due to gas leakage, the preselected gas in this embodiment is CO 2 Gas and CO 2 Gas is also common in the goaf.
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