Overlapping Double Boltzmann Fitting Method for Surface Subsidence Rate in Coal Seam Mining with Thick Loose Seam

Abstract

The invention discloses a thick-unconsolidated-layer conditioned coal mining subsidence ratio overlapping double-Boltzmann fitting method. The method includes the steps of 1), according to observed data analysis, determining the ratio of thickness of mining width to bedrock when the bedrock in a research area is fully mined; 2), performing Boltzmann function fitting in two segmentations by taking the critical wide base ratio kLj0 as a dividing point of segmentation fitting; 3), for the first segmentation with the wide base ratio of kLj< / =kLj0 and the bedrock is not fully mined, taking the comprehensive depth ratio kL as an independent variable; 4), for the second segmentation with the wide base ratio of kLj>kLj0 and the bedrock is fully mined, taking the ratio hss / M of unconsolidated layer water loss thickness hss to mining thickness M as an independent variable; 5), performing fitting of two functions in the step 3) and the step 4) in the position of the critical wide base ratio of the bedrock to acquire the overlapping double-Boltzmann fitting function and a fitting curve of the subsidence ratio. A new description method is provided for mining subsidence problems of multifactorial complex effects.

Description

technical field [0001] The invention relates to the technical field of coal mining. More specifically, it relates to the overlapping double Botzmann fitting method of surface subsidence rate in coal seam mining under the condition of thick unconsolidated seam. Background technique [0002] Mining subsidence is related to more than 10 geological and mining change factors, which are complex and difficult to study. There are still some problems in the description of the relationship between mining subsidence and geological mining conditions: 1) The description of rock formation failure is out of touch with the law of surface movement, and the description of continuous basins in surface movement is out of touch with the description of surface cracks and steps; 2) The "three zones" of rock formation movement describe deformation The degree of zoning characteristics, some conditions are described as "three zones" but incomplete and inappropriate; 3) The adequacy of mining is a de...

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Problems solved by technology

[0002] Mining subsidence is related to more than 10 geological and mining change factors, and the problems are complex and difficult to study

There are still some problems in the description of the relationship between mining subsidence and geological mining conditions: 1) The description of rock formation failure is out of touch with the law of surface movement, and the description of continuous basins in surface movement is out of touch with the description of surface cracks and steps; 2) The "three zones" of rock formation movement describe deformation The degree of zoning characteristics, some conditions are described as "three zones" but incomplete and inappropriate; 3) The adequacy of mining is a description of the degree of lateral mining on the surface, and the relationship between the adequacy of mining and the movement of rock formations is rarely studied. Few studies have been conducted on the influence of vertical mining degree and the interaction between vertical and horizontal mining degree on rock formation and surface

[0017] The calculation method of the subsidence coefficient and the relationship between the subsidence coefficient and the subsidence rate described above are dense function relationships, which reflect a growth relationship, but there is a certain deviation from the actual change of the subsidence rate, especially for thick Large deviations under loose layer conditions

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