Reclamation Methods To The Land Subsidence Of The Mining Area With High Phreatic Water Surface

Subsidence is the main form of land destruction that brought by under coal mining. Generally speaking, the subsidence area is in proportion of 80% to the whole destroyed mining area. It is the most important thing to reclaim the land subsidence in the mining area with high phreatic water surface.In this thesis, the land subsidence in mining area with high phreatic water surface is the study object, on the base of mastering multifold reclamation method, depending on the index of land classification as subsidence intensity, seeper rate, gradient, erode degree, etc; adopting different method of land classification to coal mining subsidence area. That is to classify the land synthetically according to property right factor, steady subside status, destroy degree and gain 20 different type of coal mining subsidence area. On the base of mining subsidence rule, mine layout, geological status and practical survey data to draw the fig of subsidence isoline and analyze the stability of coal mining subsidence area. According to the relief map of mining area and other geological landform information to confirm the landform change arose by coal mining, seeper degree and destroyed degree, gain the steady subsidence area, un-steady subsidence area and non-subsidence area. The steady subsidence area and un-steady subsidence area can classify detailedly as non-seeper subsidence droughty land, subsidence swampland, seasonal seeper subsidence land, perennial subsidence land with low seeper, perennial subsidence land with deep seeper. Carrying different reclamation methods to reclaim different type of subsidence land, these methods are filling reclamation method, leveling land and building terrace, dredging and drainage, digging deep and filling low, architecture reclamation method and utilizing seeper area synthetically. Adopting dynamic subside method to reclaim the un-steady subsidence area, arranging the reclamation time logically with the exact mining plan; confirming the depth and bound of non-subsidence area by land subsidence anticipation, consequently, carrying out the method of pre-ejection gangue to reclaim the non-subsidence area.