Calculation method of stope floor damage depth under the action of confined water pressure

A technology of failure depth and calculation method, applied in design optimization/simulation, instrumentation, electrical and digital data processing, etc., can solve the problems of increasing the amount of compression deformation and expansion, being unreasonable, and not considering the form of tensile failure. The effect of simple calculation, easy calculation of parameters, and easy calculation of parameters
CN105160174BActive Publication Date: 2021-04-13ANHUI UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ANHUI UNIV OF SCI & TECH
Publication Date
2021-04-13

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Abstract

The invention discloses a method for calculating the damage depth of the stope floor under the action of the confined water pressure, which comprises the following steps: 1) selecting the calculation range of the model; 2) defining the action ranges and loads of the supporting pressure and the water pressure of the floor distribution form; 3) Define the material properties of the floor rock mass within the calculation range; 4) Set the floor stress component to be the superposition of the additional stress caused by the mine pressure and water pressure and the original rock stress; 5) According to the elastic half-space theory Fu Laman solution and Mindlin’s solution deduced the additional stress components of the floor under the action of support pressure and water pressure; 6) According to the results of the stress solution, the mohr-coulomb criterion with tensile yield was selected to calculate the depth of floor failure, and the shear and Depth and extent of tensile failure. Compared with the existing analytical solution method, the present invention considers the effect of the bottom plate's confined water pressure, which is more in line with the actual situation.
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Description

technical field

[0001] The invention relates to the field of coal mining, in particular to a calculation method capable of considering the damage depth of stope floor under the action of confined water pressure. Background technique

[0002] Floor water inrush in coal mining above confined water is one of the major disasters in my country's coal mining. How to avoid floor water inrush has always been a technical problem in the safe mining of coal mines in my country.

[0003] When the coal seam is mined, under the combined action of the mine pressure and the underlying confined water, when the waterproof floor reaches or exceeds the extreme value of the rock mass strength of the floor, the rock mass within a certain range of the floor of the working face will be damaged. If the zone communicates with the underlying confined aquifer of the coal seam, the floor water inrush will be formed. Therefore, the accurate calculation of the failure depth of the stope floor is an impor...

Claims

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