A Mine Austrian Ash Top Reconstruction and Construction Method Based on Kilometer Directional Drilling Technology

Abstract

The invention discloses a method for modification and construction of top of Ordovician limestone of mine based on kilometer directional drilling technique. The method comprises the following steps: the drilling work for grouting modification of the top of the Ordovician limestone of the mine is applied through a kilometer directional drilling machine, a hole is drilled nonlinearly along the layer, a layout form of drilling the hole can be one perforated hole and multiple intersected holes, and advance grouting is adopted. According to the method for modification of the top of the Ordovician, the problem of safety mining under the conditions of insufficient thickness and strength of a water resisting layer when performing coal mining above a confined aquifer. An Ordovician limestone karst development structure and a hidden rupture structure are blocked in a large scale without occupying coal mining or driving face, a permeable layer at the top of the Ordovician limestone is converted to a water resisting layer in a certain range, so that ore resources threatened by the confined water are released, driving and recovery can be applied under the environment, no or few water prevention (separation) coal pillars can leave, and the resource recovery rate is improved.

Description

Technical field [0001] The invention relates to a mine Ordovician ash top reconstruction and construction method based on kilometer directional drilling technology, and belongs to the field of underground engineering water hazard prevention and control such as underground mines. Background technique [0002] At present, in the mining of deep confined coal seams, there are cases of grouting transformation of the thin aquifer above the Ordovician ash. However, as the mining depth increases, the water pressure continues to increase. When the mining layer interacts with the Ordovician thick ash When the thickness of the water-resistant layer between rock aquifers is less than the safe thickness, it is difficult to implement drainage and pressure reduction due to the development of Ordovician lime karst. There is no effective safe mining method at present; there are methods to reduce the depth of rock damage and increase the thickness of the effective water-resistant layer However, th...

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Problems solved by technology

[0002] At present, in the mining of deep confined water coal seams, there are cases of grouting reconstruction of the thin aquifer above the Ordovician ash, but as the mining depth increases, the water pressure continues to increase. When the thickness of the water-resisting layer between rock aquifers is less than the safe thickness, it is difficult to implement drainage and decompression due to the development of Austrian limestone karst, and there is no effective safe mining method at present; However, this method still needs to reserve water-resistant coal pillars, resulting in a lot of waste of resources; the traditional roadway or mining area floor reconstruction has a large number of openings, low hole utilization, complex technical processes, and is difficult to use for high-pressure Austrian ash Large-scale bedding-based regional governance of aquifers

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