Method for estimating development height of overlying strata water flowing fractured zone of solid filling and coal mining

Abstract

The invention discloses a method for estimating the development height of an overlying strata water flowing fractured zone of solid filling and coal mining. The method comprises the following steps: establishing a solid filling and coal mining numerical value model by using finite element analysis software according to the collected engineering geological condition information of a filling and coal mining working surface and the physical and mechanical parameters of coal-rock mass obtained by a rock mechanics experiment; simulating the height of an overlying strata plastic region under the conditions that the mining height M and the fullness ratio are changed, then simulating the height of the overlying strata plastic region under the conditions that the fullness ratio is unchanged and the mining height M is changed, and determining the height of the plastic region to be the development height H of the water flowing fractured zone; on the basis of the simulating result, performing multiple regression to obtain a relational expression of the fullness ratio mining height M and the development height H of the water flowing fractured zone; according to the actual engineering parameters of filling and coal mining, designing the actual mining height Mc of the fullness ratio and calculating the development height Hc of the overlying strata water flowing fractured zone. The method provides a reference for accurate estimation of the development height of the overlying strata water flowing fractured zone of the solid filling and coal mining, and provides a theoretical reference for safety mining of a coal seam under a water-bearing layer.

Description

technical field [0001] The invention relates to a method for predicting the development height of a water-conducting fissure zone in coal mining, in particular to a method for predicting the development height of a water-conducting fissure zone in solid filling coal mining overlying rock in coal mining. Background technique [0002] In the solid filling coal mining technology, solid wastes such as gangue, fly ash, loess and aeolian sand are transported underground through the ground transportation system and the vertical delivery system for solid filling materials, and then directly filled in the goaf through the underground transportation system. As the goaf filling body acts as the main support to bear most of the load of the overlying strata, thus restricting the movement of the overlying strata, the movement and failure characteristics of the overlying strata are changed from the "three zones" (caving zone, fracture zone and bending zone) subsidence zone) into "two zones...

AI Technical Summary

Problems solved by technology

At present, there is no accurate prediction method for the development height of the water-conducting fractured zone in the coal-covered rock with solid filling, and the mining height and filling rate are the key factors affecting the development height of the water-conducting fractured zone in the coal-covered rock with solid filling. Therefore, It is of great significance to realize the safe mining of coal seams under aquifers by studying the influence of key factors on the development height of the water-conducting fracture zone in the overlying rock in solid-fill coal mining, so as to accurately predict the development height of the water-conducting fracture zone in the overlying rock in solid-fill coal mining

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