采动过程中地表移动变形规律

Discussion on laws of surface movements and deformations during Process of Coal Extraction

地表移动最终稳定盆地移动变形规律的研究,现已取得了较大的成绩。但是,采动过程中地表移动变形规律的研究尚未取得成熟的经验。采动过程中地表移动变形的分布、最大变形值及其所在位置的变化规律等一系列问题有待于进一步的研究。本文以资江煤矿设置的地表移动观测站获得的观测资料为依据进行初步分析和探讨,在达到动态充分采动之前回采工作面正上方半个地表下沉盆地的移动与变形的规律。

when longwall mining method with caving roof is used for coal extraction, the surface movements and deformations follow some laws during the process. Based on the measured data of surface movements, a negative exponential function is introduced to describe the subsidence curve equation in the main cross section along the strike over a face, using the distance of face advance along the strike as an independent variable in even speed advance condition. The advance represents not only time and space variable in mining process, but also the relation between time and space, This paper discusses priliminarily the longitudinal and latitudinal development of the subsidence curve, and changes of parameters like velocity, morphology and position etc. before reaching the dynamic critical condition. Based on which, the formulae for calculating the surface inclination and curvature are deduced, and regularity of variation of surf aee inclination, curvature and maximum deformation values and its position with change of face advance are analyzed. Finally, the measured data are compared with the calculated values of surface subsidence, inclination and curvature, and they are basically fit to each other.