New goaf solid phase structure based on LDA and a flow field regression method

A regression method and goaf technology, which is applied in the field of solid phase structure and flow field regression of newly mined goaf based on LDA, can solve the problem of inapplicability of porous medium newly mined gob, and achieve the effect of improving the test accuracy.

Active Publication Date: 2020-05-08
LIAONING TECHNICAL UNIVERSITY
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[0003] The technical problem to be solved in the present invention is to provide a kind of LDA-based new goaf solid phase structure and flow field regression method for the above-mentioned deficiencies in the prior art. This method solves t

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  • New goaf solid phase structure based on LDA and a flow field regression method
  • New goaf solid phase structure based on LDA and a flow field regression method
  • New goaf solid phase structure based on LDA and a flow field regression method

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[0022] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] The scale range of the collapse step of the old roof behind the coal mining face is called the new mined-out area. The internal caving space of the new mined-out area can often reach several meters or even tens of meters. Such a large scale has far exceeded that of porous media. To characterize the voxel scale and pore size, the flow in the new mined-out area is not seepage in porous media. The flow in the newly mined-out area is a natural flow under large-scale and complex geometric dimensions, which is called "cavity flow". The "cavity flow" algorithm describes the internal solid phase structure of the goaf through the random binary method array, and uses the Lat...

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Abstract

The invention provides a new goaf solid phase structure based on LDA and a flow field regression method, and relates to the technical field of mine ventilation. The method comprises the following steps: firstly, establishing a new goaf experimental model, and arranging observation points in the model; and testing the model through a laser Doppler velocimeter to obtain actual measurement speed values of observation points; randomly generating a plurality of binary method arrays; and calculating the gas flow state of each sample by adopting a lattice Boltzmann method, matching the positions ofthe observation points in the model in the samples, and extracting the calculation results of the corresponding positions; and finally, calculating an adaptive value, judging whether the adaptive value meets a termination condition or not, if so, outputting the binary array and the flow field flow state thereof, and if not, selecting, crossing and mutating individuals in the sample set and repeating the step 5. The invention solves the problem that the porous medium is not suitable for the new goaf, can process the complex geometric boundary of the new goaf, and accurately obtains the internalsolid phase structure and gas flow state of the new goaf.

Description

technical field [0001] The invention relates to the technical field of mine ventilation, in particular to an LDA-based method for regressing the solid phase structure and flow field of a new mined-out area. Background technique [0002] The goaf is one of the main accident sites in mines, where gas accumulation is closely related to explosion, water seepage accidents, coal spontaneous combustion and the flow characteristics in the goaf. At present, the calculation of gobs is based on the theory of porous media fluid dynamics, that is, an imaginary continuous medium is used to replace the actual porous medium with gaps all over, and the average state variables such as the physical parameters of the porous medium in a certain volume value as the value of the hypothetical continuum parameter. There are many restrictions on the use of fluid dynamics in porous media: the pore size of porous media is very small and the specific surface area is large; the size of the pores is much...

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Application Information

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IPC IPC(8): G06F30/28G06F30/27G06N20/00G01M9/08G01M9/06G06F113/08
CPCG06N20/00G01M9/08G01M9/065
Inventor 刘剑周启超王东高科邓立军
Owner LIAONING TECHNICAL UNIVERSITY
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