Method for predicting residual deformation of old goaf in steeply inclined thick coal seam

Abstract

The present invention discloses a method for predicting residual deformation of the old goaf in the steeply inclined thick coal seam. The method comprises: analyzing a residual deformation mechanism of the old goaf in the steeply inclined thick coal seam, and then analyzing the mining effect propagation regulation of the steeply inclined thick coal seam; using a changing mining effect propagation angle to describe the special form of rock movement; correcting parameters in a theory model in the traditional probability integral method, and establishing a mining subsidence prediction model based on the change of the mining effect propagation angle; by combining the equivalent mining thickness idea, using the matlab programming to construct the residual movement deformation prediction model; introducing the Kelvin model to analyze the creep characteristics of the old goaf and to construct the dynamic prediction function of the residual settlement, so that dynamic analysis of the residual settlement is carried out. Beneficial effects of the method disclosed by the present invention are that: the method for determining residual deformation generated by further activation of the old goaf under the influence of the external force after the collapse of the goaf of the steeply inclined thick coal seam is stable, and the method can also be applied to the foundation evaluation on the new building above the old goaf.

Description

technical field [0001] The invention relates to the field of geotechnical engineering research, in particular to a method for predicting residual deformation of an old goaf in a steeply inclined extra-thick coal seam. Background technique [0002] In recent years, with the rapid development of my country's urban rail transit and the continuous acceleration of the construction of mining areas, some new subway lines will inevitably pass through the subsidence area of ​​the old goaf. Although these collapsed goafs have undergone long-term natural compaction, there are still gaps in the broken rock mass and other uncompacted phenomena after the goaf collapses. At this time, under the influence of the external environment, relatively The state of stress balance may be broken, resulting in the re-movement and deformation of the subsidence area and its overlying rock mass, which will lead to large residual movement and deformation above the collapsed goaf and damage the subway stru...

AI Technical Summary

Problems solved by technology

Therefore, for steeply inclined ultra-thick coal seams, the traditional probability integration method will have certain defects.

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