Study on Pre-backfilling Construction Control Mode in Dynamic Coal Mining Subsidence Area
In view of the problem of lagging governance in the traditional"stabilizing and settling before treatment"mode in coal mining subsidence areas and the increasing attention of the state to ecological environmental protection,the concept and thought of pre-treatment in dynamic coal mining subsidence areas has become an increasing consensus in the industry.For the site of dynamic coal mining subsidence area which is pre-treated as agricultural land or construction land,a basic work is to backfill the site in advance to meet the requirements of the site for design and use elevation.The traditional control mode of the pre-backfill project in the dynamic coal mining subsidence area is controlled by the construction elevation,and the construction elevation tends to decrease with the dynamic surface subsidence,that is,different subsidence time corresponds to different con-struction elevation.Because the actual construction time of the pre-backfill project often lags behind the survey and design time,if the construction elevation determined by the survey and design time node is still adopted during construction,the actual elevation of the site after the final stabilization will deviate from the original expected planning elevation.In order to solve the problems existing in the traditional construction mode of pre-fill engineering controlled by elevation,a new idea is put forward to control the pre-fill construction by the thickness of earthwork backfill,and the calculation formula of the thickness of earth-work pre-fill under different conditions is analyzed and deduced,which provides a theoretical basis for drawing the isopachic plan of earthwork backfill.The study results that:under the condition that the elevation of underground mining plan and surface planning is unchanged,the construction mode of pre-backfill engineering controlled by filling thickness overcomes the deficien-cy of elevation control.This method has the characteristic that the thickness of pre-backfill does not change with time,and has certain applicability to the pre-treatment design and construction of dynamic coal mining subsidence area.
mining subsidencedynamic mining subsidence areapre-backfillconstruction contourearthwork backfill e-qual thickness line
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