Method for determining permeability coefficient of loose confined aquifer based on coal mine geological drilling

Abstract

The invention provides a method for determining the permeability coefficient of an unconsolidated confined aquifer based on geological drilling. The method comprises the following steps: collecting geological drilling information and data; determining influence factors of the permeability coefficient; performing correlation analysis and partial correlation analysis on each influence factor and a permeability coefficient obtained by an existing field water pumping test, and selecting a key influence factor; performing random combination on the key influence factors, performing multiple linear regression analysis, performing goodness-of-fit test and equation significance test, and performing sorting; determining a target regression equation according to the sorting result; and substituting the existing geological drilling information and data of the coal mine into the target regression equation, and determining the permeability coefficient of the unconsolidated confined aquifer. According to the method, mathematical means are applied to engineering practice, existing coal mine geological drilling information and data can be fully utilized, and technical support is provided for research on anisotropy and regional effect of the permeability coefficient of the unconsolidated formation and prevention and treatment of hydrogeological disasters such as mine water inrush.

Description

technical field [0001] The invention relates to the field of water prevention and control in coal mines, in particular to a method for determining the permeability coefficient of a loose pressurized aquifer based on coal mine geological drilling. Background technique [0002] Coal-measure strata in concealed coalfields in North my country are generally covered by Quaternary thick unconsolidated beds, in which multiple confined aquifers develop. Mining of coal seams near loose confined aquifers often occurs hydrogeological disasters such as mine water inrush, surface subsidence, shaft deformation and damage, and even huge economic losses and casualties. The permeability coefficient is an important parameter that reflects the permeability of the soil medium of the loose confined aquifer. In order to avoid the above-mentioned hydrogeological disasters, it is necessary to accurately measure the permeability coefficient of the loose confined aquifer, which is conducive to the sci...

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Problems solved by technology

Due to the limitations of manpower, material and financial resources, the boreholes that can be used for pumping tests are limited, and the permeability coefficient obtained from the test cannot reflect the change law of the actual permeability coefficient of the loose confined aquifer in the study area and its regional effects.

Moreover, existing studies have shown that the permeability coefficient is an essential parameter for analyzing the anisotropy of loose aquifers. If the permeability coefficient of the entire aquifer in the study area is treated as a constant value, it will inevitably cause large errors. Therefore, based on the existing coal mine geology It is of great engineering application value to propose a method for determining the permeability coefficient suitable for unconsolidated confined aquifers based on drilling data.

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