CN-121974654-A - Groundwater plugging material and groundwater plugging method for water conservation exploitation

CN121974654ACN 121974654 ACN121974654 ACN 121974654ACN-121974654-A

Abstract

The application discloses an underground water plugging material and an underground water plugging method for water conservation exploitation, which relate to the technical field of water conservation exploitation, the underground water-sealing plugging material comprises calcium sulfoaluminate cement clinker, micro-nano Fe 3 O 4 , water glass, bacillus megaterium powder, urea, anhydrous CaCl 2 powder and azodicarbonamide, and can improve the plugging reliability.

Inventors

LI TAO
FAN LIMIN
GAO YING
YANG JUNWEI
XIE XIAOPING
LIU YONGZHI
SUN GUANGYU

Assignees

六盘水师范学院

Dates

Publication Date: 20260505
Application Date: 20260305

Claims (10)

1. The underground water blocking material for water conservation exploitation is characterized by comprising calcium sulfoaluminate cement clinker, micro-nano Fe 3 O 4 , water glass, bacillus megaterium powder, urea, anhydrous CaCl 2 powder and azodicarbonamide.
2. The underground water blocking material for water conservation exploitation according to claim 1, wherein the calcium sulfoaluminate cement clinker is 5-20 parts, the micro-nano Fe 3 O 4 is 50-80 parts, the water glass is 20-50 parts, the bacillus megaterium powder is 5-10 parts, the urea is 5-10 parts, the anhydrous CaCl 2 powder is 5-10 parts, and the azodicarbonamide is 1-5 parts.
3. The underground water blocking method for water conservation exploitation is characterized by comprising the following steps of: Determining a plugging area in the coal exploitation process within a set time period in the future of a target mine; a detection hole is implemented in the plugging area, and a strong underground water radial flow belt is determined according to the underground water flow velocity of each measuring point collected in the implementation process of the detection hole from the ground downwards; Determining the proportion of various materials in the underground water sealing material according to the underground water flow rate of the underground water strong-diameter flow belt and the set magnetic field induction intensity, so that the underground water sealing material after the proportion is adjusted meets the set condition, wherein the underground water sealing material adopts the underground water sealing material facing water conservation exploitation according to any one of claims 1-2, and the set condition is that the initial setting time accords with the set initial setting time range, and the tensile strength is larger than the set tensile strength value within the set time length after the initial setting; and plugging the underground water strong runoff zone of the plugging area by matching the underground water plugging material with the magnetic rod after the proportion is adjusted.
4. The underground water blocking method for water conservation exploitation according to claim 3, wherein the step of determining the blocking area in the coal exploitation process within a set period of time in the future of the target mine comprises the following steps: Predicting the mining influence range of a mining area in a future set time period of a target mine; And determining a plugging area according to the resistivity logging curve in the existing exploration drilling on the target mine and the mining influence range of the mining area.
5. The method for plugging a water-retention mining-oriented underground water according to claim 4, wherein predicting the mining area mining influence range in a set period of time in the future of the target mine specifically comprises: Determining the burial depth of the coal bed through a drilling histogram of the mining area; determining a crack expansion value according to the burial depth of the coal seam; and taking the fracture expansion value range expanded outside the mining area as the mining area mining influence range.
6. The method for plugging a water-retention mining-oriented subterranean water of claim 4, wherein the determining the plugging zone based on the resistivity log in the existing exploration borehole at the target mine and the mining area mining influence range comprises: If a stratum with resistivity smaller than 300 omega-m exists in the resistivity logging curve, selecting a region with resistivity smaller than 300 omega-m and outside the mining influence range of the mining region from a plugging region; If no stratum with resistivity smaller than 300 omega-m exists in the resistivity logging curve, the plugging area is selected to be in the range of 500 meters of the exploration drilling with the minimum resistivity.
7. The underground water blocking method for water conservation exploitation according to claim 3, wherein the underground water strong-diameter flow band is a length sum of measuring sections with flow rates of adjacent measuring points in the exploration hole being larger than a set flow rate; the set flow rate is 10m/d; the initial setting time range is 10 min-60 min, the set time length is 28 days, and the set tensile strength value is 10MPa.
8. The underground water blocking method for water conservation exploitation according to claim 3, wherein the underground water blocking material after the proportioning adjustment is matched with a magnetic rod to block the underground water strong runoff zone of the blocking area, and the method specifically comprises the following steps: determining the plugging length according to the height of the strong runoff zone of the underground water, the water pressure and the compressive strength of the underground water plugging material after the proportioning is adjusted; a feeding drilling group is implemented at the upstream of the underground water strong runoff zone within a set distance range from the plugging zone, and the feeding drilling group drills to a set depth below a stratum bottom plate where the underground water strong runoff zone is located; the plugging drilling hole group is drilled to a set depth below a stratum bottom plate where the underground water strong runoff zone is located; A magnetic rod is arranged in the plugging drilling group; And adding the underground water-blocking material after the proportion is regulated into the feeding drilling group until the grouting pressure reaches a set pressure value.
9. The underground water blocking method for water conservation exploitation according to claim 8, wherein the blocking length is determined according to the height of the strong runoff zone of the underground water, the water pressure and the compressive strength of the underground water blocking material after the proportioning is adjusted, and specifically comprises the following steps: The occlusion length is calculated according to the following formula: ; wherein B is a pressure safety coefficient, 2-4 is taken, h is the height of the strong-diameter flow band of the underground water, P is water pressure, Ρ is the density of water, V is the flow rate of groundwater, g is the gravitational acceleration, X is the height of the stratum bottom plate where the water level is higher than the strong runoff zone of groundwater, and K L is the compressive strength of the groundwater plugging material after the proportioning is adjusted.
10. The underground water blocking method for water conservation exploitation according to claim 9, wherein the set distance is 1 l-2 l, the set depth is 3-5 m, the induction strength of the magnetic rod is 0.5 t-1 t, and the distance between adjacent blocking holes in the blocking hole group is smaller than 2D; d is the diffusion radius of the groundwater plugging material after the proportioning is regulated in the condition of the flow speed V within 1 day.

Description

Groundwater plugging material and groundwater plugging method for water conservation exploitation Technical Field The application relates to the technical field of water conservation exploitation, in particular to a water conservation exploitation-oriented underground water plugging material and an underground water plugging method. Background The coal exploitation in some areas has important green significance for protecting water resources in the coal exploitation process in the ecological fragile area. The water-retention coal mining technology method is more, wherein grouting plugging is a more used method. At present, the grouting plugging of the conventional underground strong-diameter flow belt has a certain effect, but has the following problems: quick setting plugging materials often have poor plugging effects due to a too high setting rate and limited diffusion range from the borehole. The cement or polymer plugging material and the method are easy to disperse under the condition of flowing water, and the grouting plugging is difficult to finish. The freezing method can be implemented on groundwater with poor hydrodynamic force, and freezing is difficult to complete under the condition of strong radial flow. The bag plugging is suitable for pipeline flow conditions, but is difficult to be put into the bag under fracture flow conditions, so that the grouting has a limited application range. Disclosure of Invention The application aims to provide an underground water plugging material and an underground water plugging method for water conservation exploitation, which can improve the plugging reliability. In order to achieve the above object, the present application provides the following solutions: In a first aspect, the application provides an underground water blocking material for water conservation exploitation, which comprises calcium sulfoaluminate cement clinker, micro-nano Fe 3O4, water glass, bacillus megaterium powder, urea, anhydrous CaCl 2 powder and azodicarbonamide. Optionally, the calcium sulfoaluminate cement clinker is 5-20 parts in proportion, the micro-nano Fe 3O4 is 50-80 parts in proportion, the water glass is 20-50 parts in proportion, the bacillus megaterium powder is 5-10 parts in proportion, the urea is 5-10 parts in proportion, the anhydrous CaCl 2 powder is 5-10 parts in proportion, and the azodicarbonamide is 1-5 parts in proportion. In a second aspect, the present application provides a method for plugging an underground water for water conservation exploitation, where the method for plugging an underground water for water conservation exploitation includes: Determining a plugging area in the coal exploitation process within a set time period in the future of a target mine; a detection hole is implemented in the plugging area, and a strong underground water radial flow belt is determined according to the underground water flow velocity of each measuring point collected in the implementation process of the detection hole from the ground downwards; Determining the proportion of various materials in the underground water sealing material according to the underground water flow rate of the underground water strong-diameter flow belt and the set magnetic field induction intensity, so that the underground water sealing material after the proportion is adjusted meets the set condition, wherein the underground water sealing material facing the water preservation exploitation is adopted as the underground water sealing material, and the set condition is that the initial setting time accords with the set initial setting time range, and the tensile strength is larger than the set tensile strength value within the set time length after the initial setting; and plugging the underground water strong runoff zone of the plugging area by matching the underground water plugging material with the magnetic rod after the proportion is adjusted. Optionally, determining a plugging area in the coal mining process within a set time period in the future of the target mine specifically comprises: Predicting the mining influence range of a mining area in a future set time period of a target mine; And determining a plugging area according to the resistivity logging curve in the existing exploration drilling on the target mine and the mining influence range of the mining area. Optionally, predicting the mining area mining influence range in the future set time period of the target mine specifically includes: Determining the burial depth of the coal bed through a drilling histogram of the mining area; determining a crack expansion value according to the burial depth of the coal seam; and taking the fracture expansion value range expanded outside the mining area as the mining area mining influence range. Optionally, determining the plugging area according to the resistivity logging curve in the existing exploration drilling on the target mine and the mining influence range of the mining area specifical