Study on surface movement deformation characteristics of repeated mining face in thick loose layers
WANG Kang-jian
TANG Jin-bao
SHI Ning-ning
LIU Yong-qi
Abstract：In order to study the surface deformation law under the repeated mining conditions in the thick loose layer mining areas,the repeated mining No.14148 working face in a mine in Huainan was taken as the engineering background,and the repeated mining sur-face deformation law under the synergistic influence of different levels and the same level was obtained through the analysis of the field actual measurement data,in order to study the causes of the special surface movement deformation law of repeated mining,and a numeri-cal simulation study was conducted.The results indicate that surface subsidence and horizontal movement are intensified under repeated mining conditions in thick loose layers,the angular parameter of the upper hill decreases and that of the lower hill increases,the surface subsidence coefficient and the tangent of the main influence angle become larger,and the movement deformation in the direction of the goaf of the same level intensifies;through numerical simulation,it is found that the repeated mining at different levels will increase the surface movement deformation to a small extent,but the enhancement of mining adequacy caused by mining near the No.17278 working face is the main reason for the special surface movement deformation characteristics of the No.14148 repeated mining working face.
Keywords：thick loose layersrepeated miningsurface movement deformationnumerical simulation
Publication Date：2023-12-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 57-63 )