Post-mining water-resisting layer reconstruction method and related device

A post-mining water-resisting layer reconstruction method through partition grouting for a coal-measure aquifer in coal seam roof strata, comprising:

• obtaining geological parameters of a target mining area, and determining strata distribution parameters of the target mining area based on the geological parameters;
• performing a feature analysis processing on the strata distribution parameters through a distribution feature algorithm to determine hydrogeological characteristics of the coal seam roof strata in the target mining area;
• performing a water-conducting fracture zone analysis on the hydrogeological characteristics through a numerical simulation algorithm to determine a development height of a water-conducting fracture zone;
• performing a distribution relationship analysis according to the development height of the water-conducting fracture zone and the hydrogeological characteristics through a distribution relationship algorithm to obtain a distribution relationship between the development height of the water-conducting fracture zone and the hydrogeological characteristics, and determining a target grouting control strategy for a post-mining coal seam roof strata based on the distribution relationship;
• and
• implementing a grouting treatment on the post-mining coal seam roof strata according to the target grouting control strategy;
• wherein the hydrogeological characteristics comprises:
• a position of a weathered bedrock, and/or a position of a loose aquifer, and/or a position of an abnormal water-rich zone;
• wherein performing a distribution relationship analysis according to the development height of the water-conducting fracture zone and the hydrogeological characteristics through a distribution relationship algorithm to obtain a distribution relationship between the development height of the water-conducting fracture zone and the hydrogeological characteristics and determining a target grouting control strategy for a post-mining coal seam roof strata based on the distribution relationship comprises:
• determining the distribution relationship based on the development height of the water-conducting fracture zone and the position of the weathered bedrock;
• in response to determining the distribution relationship indicating that the development height of the water-conducting fracture zone does not extend into the weathered bedrock, determining a first determination result about whether there exists an abnormal water-rich zone within the development height of the water-conducting fracture zone;
• in response to determining the first determination result is negative, determining the target grouting control strategy for the post-mining coal seam roof strata as no grouting treatment required;
• and
• in response to determining the first determination result is affirmative, determining the target grouting control strategy for the post-mining coal seam roof strata as performing a curve branch borehole drilling and grouting in each aquiclude beneath each abnormal water-rich zone within an aquifer within the development height of the water-conducting fracture zone;
• wherein the method further comprises the following steps after determining the distribution relationship based on the development height of the water-conducting fracture zone and the position of the weathered bedrock:
• in response to determining the distribution relationship indicating that the development height of the water-conducting fracture zone extends into the weathered bedrock, determining a second determination result about whether the development height of the water-conducting fracture zone reaches the position of the loose aquifer;
• in response to determining the second determination result is negative, determining a third determination result about whether the loose aquifer migrates to recharge the weathered bedrock;
• in response to determining the third determination result is affirmative, determining a fourth determination result whether there exists an abnormal water-rich zone within the development height of the water-conducting fracture zone;
• in response to determining the fourth determination result is affirmative, determining the target grouting control strategy for the post-mining coal seam roof strata as grouting at the position of the weathered bedrock and implementing a curve branch borehole drilling and grouting in each aquiclude beneath each abnormal water-rich zone in an aquifer within the development height of the water-conducting fracture zone;
• and
• in response to determining the fourth determination result is negative, determining the target grouting control strategy for the post-mining coal seam roof strata as grouting at the position of the weathered bedrock, grouting and repairing each aquiclude within the development height of the water-conducting fracture zone to reconstruct the aquiclude;
• wherein the method further comprises the following steps after determining the second determination result is negative and determining the third determination result about whether the loose aquifer migrates to recharge the weathered bedrock:
• in response to determining the third determination result is negative, determining a fifth determination result about whether there exists an abnormal water-rich zone within the development height of the water-conducting fracture zone;
• in response to determining the fifth determination result is affirmative, determining the target grouting control strategy for the post-mining coal seam roof strata as implementing a curve branch borehole drilling and grouting in each aquiclude beneath each abnormal water-rich zone in the aquifer within the development height of the water-conducting fracture zone;
• and
• in response to determining the fifth determination result is negative, determining the target grouting control strategy for the post-mining coal seam roof strata as grouting and repairing the aquiclude within the development height of the water-conducting fracture zone to reconstruct the aquiclude.