A method of determining a surface subsidence coefficient for coal mining under a loess gully region

Abstract

The invention discloses a method of determining a surface subsidence coefficient for coal mining under a loess gully region. The method includes a first step of preliminarily calculating a subsidence coefficient of coal mining under conditions according to data measured by observation stations distributed on ground for coal mining under the loess gully region, a second step of analyzing slope stability, and calculating a subsidence additional quantity caused by the slope stability, and a third step of further determining the surface subsidence coefficient [Eta] by combining the ground measured data and the additional quantity caused by slope slippage in the gully region and by utilizing a computer inverse modeling manner. The method is simple in steps, convenient to implement, capable of accurately determining the surface subsidence coefficient of the loess gully region, good in using effects and convenient to popularize and use.

Description

Technical field [0001] The invention relates to the technical field of coal seam mining, in particular to a method for determining the surface subsidence coefficient of coal seam mining in loess gully areas. Background technique [0002] Since the various indicators of surface movement and deformation are directly related to the maximum surface subsidence value, and the maximum surface subsidence value is determined by the subsidence coefficient, it can be seen that the surface subsidence coefficient plays a decisive role in accurately predicting surface movement and deformation. , It is particularly important to determine the surface subsidence coefficient more accurately. [0003] At present, the method for determining the surface subsidence coefficient is usually the ratio of the actual subsidence value observed on the surface to the mining height of the coal seam. The surface subsidence coefficient is a certain value. The application of this method is more suitable under genera...

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Problems solved by technology

[0003] At present, the method of determining the surface subsidence coefficient is usually the ratio of the actual subsidence value observed on the surface to the mining height of the coal seam. For mining in the lower coal seam, the surface subsidence coefficient is determined according to the above calculation method. Since the stability of the slope body in the loess gully area is not considered, the subsidence coefficient will increase, resulting in a large error in the prediction of surface subsidence; at the same time, according to the above calculation method , the surface subsidence is not a fixed value, and the calculated subsidence coefficient varies with the stability of the slope, which will produce large deviations and bring uncertainty to the on-site surface subsidence prediction

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