I-shaped water-retaining dam for underground reservoir in coal mine

1. An I-shaped water-retaining dam for an underground reservoir in a coal mine, which is located between coal pillar dams on a left and right side of a roadway and is configured to isolate the underground reservoir from the roadway and block a water source in the underground reservoir, comprising a dam body of the I-shaped water-retaining dam which comprises an upper flange plate, a web plate, and a lower flange plate from top to bottom, wherein a vertical section of the dam body perpendicular to a dam face is of an I shape; left and right ends of the upper flange plate, the web plate, and the lower flange plate are embedded into the coal pillar dams; the upper flange plate is embedded into surrounding rock of a roadway roof; and the lower flange plate is embedded into surrounding rock of the roadway floor.

2. The I-shaped water-retaining dam for an underground reservoir in a coal mine according to claim 1 , wherein the upper flange plate is formed by extending beyond the web plate both in directions of a length and a thickness of the web plate, and/or the lower flange plate is formed by extending around beyond the web plate both in directions of the length and the thickness of the web plate.

3. The I-shaped water-retaining dam for an underground reservoir in a coal mine according to claim 2 , wherein the upper flange plate and the lower flange plate extend at least 50 cm.

4. The I-shaped water-retaining dam for an underground reservoir in a coal mine according to claim 1 , wherein a lower surface of the upper flange plate is flush with the roadway roof and/or an upper surface of the lower flange plate is flush with the roadway floor.

5. The I-shaped water-retaining dam for an underground reservoir in a coal mine according to claim 4 , wherein the upper flange plate and the lower flange plate are concrete structures with a thickness of 30-50 cm.

6. The I-shaped water-retaining dam for an underground reservoir in a coal mine according to claim 1 , wherein a depth at which the upper flange plate is embedded into the roof surrounding rock is 50-100 cm; and/or a depth at which the lower flange plate is embedded into the floor surrounding rock is 50-100 cm.

7. The I-shaped water-retaining dam for an underground reservoir in a coal mine according to claim 1 , wherein multiple groups of anchor rods are arranged at a joint between a part of the upper flange plate embedded into the roof surrounding rock and the roof surrounding rock in a width direction of the dam body; the anchor rod passes through a loose layer of the roof surrounding rock and is inserted into stable rock mass.

8. The I-shaped water-retaining dam for an underground reservoir in a coal mine according to claim 7 , wherein there are three anchor rods in each group of anchor rods, wherein one anchor rod is perpendicular to the upper flange plate, the other two anchor rods are symmetrically distributed at an angle of 45° from a horizontal direction of the upper flange plate, and in this way, a stable and dense anti-seepage area can be formed after grouting.

9. The I-shaped water-retaining dam for an underground reservoir in a coal mine according to claim 1 , wherein multiple groups of anchor rods are arranged at a joint between a part of the lower flange plate embedded into the floor surrounding rock and the floor surrounding rock in a width direction of the dam body; the anchor rod passes through a loose layer of the floor surrounding rock and is inserted into stable rock mass.

10. The I-shaped water-retaining dam for an underground reservoir in a coal mine according to claim 9 , wherein there are three anchor rods in each group of anchor rods, wherein one anchor rod is perpendicular to the lower flange plate, the other two anchor rods are symmetrically distributed at an angle of 45° from a horizontal direction of the lower flange plate, and in this way, a stable and dense anti-seepage area can be formed after grouting.

11. The I-shaped water-retaining dam for an underground reservoir in a coal mine according to claim 1 , wherein multiple rows of anchor rods are inserted at a joint between an embedded part on two sides of the web plate and the coal pillar dams in a height direction of the dam body; each row of anchor rods is arranged perpendicular to the coal pillar dam; and the anchor rod passes through a loose layer of the coal pillar dam and is inserted into a stable coal pillar dam.

12. The I-shaped water-retaining dam for an underground reservoir in a coal mine according to claim 1 , wherein multiple joist steels arranged in a # shape are disposed inside the web plate.

13. The I-shaped water-retaining dam for an underground reservoir in a coal mine according to claim 12 , wherein the vertical joist steel extends into the upper flange plate and lower flange plate.

14. The I-shaped water-retaining dam for an underground reservoir in a coal mine according to claim 1 , wherein an anti-seepage layer and a support layer are further successively arranged on a side of the web plate facing the underground reservoir, and the web plate, the anti-seepage layer, and the support layer form the I-shaped water-retaining dam of a multilayer dam body structure.

15. The I-shaped water-retaining dam for an underground reservoir in a coal mine according to claim 14 , wherein the anti-seepage layer is a gravel structure layer or a loess structure layer with a thickness of 1.5-2.5 m.

16. The I-shaped water-retaining dam for an underground reservoir in a coal mine according to claim 14 , wherein the support layer is a brick-concrete structure layer with a thickness of 1.5-2.0 m.

17. The I-shaped water-retaining dam for an underground reservoir in a coal mine according to claim 14 , wherein a waterproof layer is coated between the support layer, the anti-seepage layer, and the web plate.