2results about How to "Reduce water gushing" patented technology

This invention discloses a method for wavy directional drilling and grouting modification of complex fractured rock strata. First, by analyzing the overburden structure of the coal seam roof, permeable windows in the key water-resistant layer are identified. Second, by analyzing the overburden structure of the coal seam roof, the spatial structure of the weathered and normal bedrock layers in the window area is identified. Third, the height of the caving zone and fracture zone formed by coal seam mining in the permeable window area is predicted. Fourth, the relationship between the mining-induced water-conducting fractures and the exposed weathered bedrock layer in the window area is analyzed to identify areas where grouting can be used to treat the permeable window. Fifth, based on the identified areas where grouting can be used, wavy directional boreholes are designed on the surface in the weathered bedrock layer of the window area. Sixth, the wavy directional boreholes are drilled and grouting is carried out to create an artificially reconstructed water-blocking layer in the permeable window area, thereby reducing water inflow from the roof of the coal mining face and protecting groundwater resources.

The present application relates to the technical field of coal mining, and provides a coal mine resource collaborative mining and full-space destruction control method for surrounding rock in a mining area, comprising the following steps: determining the horizon of a low-position thick hard basic roof rock layer based on the structural parameters of a coal seam roof; determining the arrangement position and parameters of a fracturing borehole based on the horizon of the low-position thick hard basic roof rock layer; performing fracturing borehole construction, with the horizontal section of the fracturing borehole being located in the low-position thick hard basic roof rock layer and covering the entire length of the mining face in the strike direction; performing fracturing construction in the horizontal section to form fracturing cracks and controlling the development of the fracturing cracks to make the fracturing cracks penetrate the coal seam in the vertical direction; and after the fracturing construction is completed, extracting gas through the fracturing borehole. In this way, by using the fracturing of the low-position thick hard basic roof rock layer, the coal seam gas resource recovery, gas disaster control, coal mine roof / floor water disaster prevention and control, and surrounding rock control in the mining and excavation space can be simultaneously achieved, the disaster prevention and control engineering quantity is greatly reduced, the engineering cost is reduced, and the construction period is shortened.