Numerical Simulation Analysis On Rock And Surface Deformation Of Coal Mine

Surface and rock deformation induced by mining caused a lot of disastrous consequences, such as buildings, roads, bridges and other were damaged,therefore,numerical simulation analysis on rock and surface deformation of coal mine, determined the deformation function equation,that have great theoretical and practical significance.This paper based on 3 coal mining of a Shandong coal mine, numerical simulated the strata and ground deformation.Based on the geological conditions of coal mine,selected reasonable rock mechanics parameters,used FLAC3D software simulated the overlying strata destruction of only mined 33upper01 workface and both mined 33upper01 workface and 33down01 workface,determined the height of the caving zone and the height of water conducted zone. There is a sandwich between 3upper coal and 3down coal in the Shandong coal mine third district, the thickness is 7m-19.5m, chosen three simulation options, that sandwich thickness are 7m,14m,19.5m to calculate, determined the caving zone and water conducted zone of the different sandwich thickness. And compared the numerical simulation data with the data measured by double-side water shutoff device.Calculated surface and internal rock deformation of only mined 33upper01 workface, and, both mined 33upper01 workface and 33down01 workface, by numerical simulating. Used SURFER software carried out post-processing, drawing the three-dimensional maps, vectors, deformation contours. And compared the simulation data with GPS-RTK measured data.In this paper, used MATLAB made fitting and regression with the deformation data, studied the deformation regulation of the surface and internal rock.When analysised the regulation of surface subsidence, chosen quadratic polynomial, cubic polynomial, sine function, fourth degree polynomial function to make fitting, evaluated the functional equation's fitting effect with the simulated data, from the sum of squares due to error, coefficient of determination, adjusted coefficient of determination,root mean squared error,ultimately determined the best fitting function to surface subsidence was fourth degree polynomial function.In the same way,determined sine function fitting equation of surface horizontal movement, five polynomial fitting equations of internal rock's maximum subsidence, cubic polynomial fitting equations of internal rock's subsidence basin boundary,at last analyzed the monotonicityand convexity of functional equation.