A method for controlling water inrush in the area of inclined shaft passing through empty roadway

Abstract

A method for controlling water inrush in an inclined shaft through an abandoned empty tunnel belongs to the field of mining engineering technology. It can address the problem of water inrush in abandoned empty tunnels caused by groundwater accumulation, which affects mine safety production. The method uses a technical process that combines empty tunnel filling, grouting, and water drainage. A water-blocking layer is formed at the bottom of the abandoned empty tunnel above the water inrush area of the shaft. Grouting is then injected into the shaft wall to seal water-conducting fissures, blocking the path for accumulated water to escape. Drainage holes are then constructed to promptly drain water from the upper empty tunnel. This method controls water inrush in the shaft and ensures safe use.

Description

Technical Field

[0001] The invention belongs to the technical field of mining engineering, and in particular relates to a method for controlling water gushing in an area of an inclined shaft passing through an empty tunnel. Background Art

[0002] During coal mining, there are a large number of cases where inclined shafts penetrate abandoned empty lanes. Due to rainwater infiltration during the rainy season, surface water intrusion, and groundwater flow, water easily accumulates in the abandoned empty lanes. At the same time, the accumulated water can enter the inclined shaft through cracks in the surrounding rock. Over time, the accumulated water erodes the surrounding rock and support structures, posing a significant safety hazard to the surrounding rock. Furthermore, water inrush from the inclined shaft can pose a safety risk to electrical equipment inside the inclined shaft and at the bottom of the well, and may even cause flooding. Therefore, it is of great significance to control water inrush from the inclined shaft, drain the accumulated water from the abandoned empty lanes, and protect the stability of the surrounding rock and mine safety. Summary of the Invention

[0003] To address the problem of excessive water inrush from the shaft walls in abandoned tunnels, this paper proposes a technical method for managing water inrush in these areas. This method effectively prevents water accumulation in abandoned tunnels from eroding the shaft surrounding rock and preventing excessive water inrush from the shaft walls, thereby maintaining the stability of the shaft surrounding rock and ensuring safe mine production.

[0004] The present invention adopts the following technical solutions:

[0005] A method for controlling water inrush in an inclined shaft through an empty lane area comprises the following steps:

[0006] The first step is to construct a survey borehole and several filling boreholes along the inclined direction of the inclined shaft in the water-gushing area. Filling pipes are installed in the filling boreholes, and one end of the filling pipe extends into the empty roadway at the top of the inclined shaft to fill the upper empty roadway and form a filling water-proof layer on the floor of the empty roadway.

[0007] The second step is to construct grouting holes on both sides and the roof of the inclined well water-gushing area, and to seal the water-conducting cracks in the wellbore surrounding rock through grouting to form a water-blocking layer;

[0008] The third step is to construct several drainage holes on the top plate and both sides of the inclined shaft to drain the water accumulated in the empty tunnels above the inclined shaft and the water in the cracks of the surrounding rocks.

[0009] Furthermore, the spacing between the filling boreholes in the first step is 3-6m, and the angle between the filling boreholes and the inclined shaft top plate is 70-90°.

[0010] Furthermore, the investigation borehole in the first step is located at the end of the inclined direction of the inclined well.

[0011] Furthermore, the length L of the filling pipeline extending into the upper empty tunnel of the inclined shaft in the first step is the same, 0.3m<L<0.5m.

[0012] Furthermore, the thickness of the filling waterproof layer in the first step is greater than or equal to 0.3m, the filling range covers the water gushing area of the inclined well, and extends to both sides by no less than 5m.

[0013] Furthermore, a safety distance of 500 mm or more is left between the grouting borehole in the second step and the empty tunnel and the filling waterproof layer.

[0014] Furthermore, the drainage drilling holes described in the third step are dispersedly arranged, with a number of no less than 2.

[0015] Furthermore, the drainage borehole located on the top plate in the third step passes through the filling waterproof layer and enters the empty tunnel, and the diameter of the drainage borehole is not less than 50 mm.

[0016] Furthermore, the drainage boreholes located on both sides in the third step are located at the bottom of the inclined shaft side, with a depth not less than the depth of the grouting boreholes and a diameter not less than 50 mm.

[0017] The filling material should have a certain degree of fluidity, a short setting time, and be resistant to water erosion after setting. Grouting plugging materials should have good permeability, set quickly, have high strength, and be resistant to groundwater erosion after setting. Conventional inorganic filling materials are sufficient.

[0018] The beneficial effects of the present invention are as follows:

[0019] This invention uses a technical process that combines empty tunnel filling, grouting and drainage of accumulated water. By filling the bottom of the abandoned empty tunnel above the water-gushing area of the well shaft to form a water-blocking layer, grouting is performed behind the well shaft wall to seal water-conducting fissures, blocking the path for accumulated water to escape. Drainage holes are then constructed to promptly drain the accumulated water in the empty tunnel above the well shaft. This effectively controls water inrush in the well shaft and ensures its safe use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Cross-sectional view of drilling arrangement for filling empty tunnels.

[0021] Figure 2 Cross-sectional diagram of drilling arrangement for filling empty tunnels.

[0022] Figure 3 This is a cross-sectional diagram of the arrangement of drilling holes for grouting water-conducting fissures in the surrounding rock of an inclined well.

[0023] Figure 4 Cross-sectional view of the arrangement of drilling holes for drainage of inclined wells.

[0024] Among them, 1- inclined shaft; 2- empty tunnel; 3- water gushing area; 4- filling borehole; 5- investigation borehole; 6- grouting borehole; 7- drainage borehole; 8- filling aquiclude. DETAILED DESCRIPTION

[0025] The present invention will be further described with reference to the accompanying drawings.

[0026] As shown in the figure, a technical method for controlling water inrush in an inclined shaft through an empty tunnel has the following steps:

[0027] First, fill holes and inspection holes are constructed in the upper empty tunnel at regular intervals and angles in the inclined shaft roof. The fill holes must cover the entire water-gushing area and penetrate the upper abandoned empty tunnel. Fill pipes are installed in the holes. The height of the filling pipes entering the empty tunnel should be consistent, no more than 0.5m and no less than 0.3m. Next, grouting holes are constructed in the roof and sides of the inclined shaft in the water-gushing area. The depth of the grouting holes is determined based on the relationship between the inclined shaft and the empty tunnel. A safe distance should be maintained between the holes and the empty tunnel and the aquiclude. Finally, at least two drainage holes are constructed in the roof and sides of the inclined shaft in the water-gushing area. The drainage holes should be dispersed. The roof drainage holes should penetrate the aquiclude and enter the empty tunnel. The diameter of the holes should be no less than 50mm. The drainage holes on the sides are located at the bottom of the inclined shaft walls. The depth should be no less than that of the grouting holes, and the diameter should be no less than 50mm.

[0028] The construction sequence of the water gushing control process is as follows: first, construct the filling drilling holes on the inclined shaft roof, discharge the accumulated water and waste in the upper empty tunnel, and then carry out the filling construction; then construct the grouting drilling holes on the inclined shaft roof and both sides to seal the water-conducting cracks in the surrounding rock; finally, construct the water drainage drilling holes in the empty tunnel and surrounding rock cracks to drain the water accumulated in the upper empty tunnel and surrounding rock cracks of the inclined shaft.

[0029] Characteristics of grouting materials: The filling material of the empty tunnel should have a certain fluidity, a short solidification time, and should not be afraid of water erosion after solidification; the grouting sealing material should have good permeability, fast solidification, high strength, and should not be afraid of groundwater erosion after solidification.

Claims

1. A method for controlling water inrush in an inclined shaft through an empty lane, characterized by: The steps include: The first step is to construct a survey borehole and several filling boreholes along the inclined direction of the inclined shaft in the water-gushing area. Filling pipes are installed in the filling boreholes, and one end of the filling pipe extends into the empty roadway at the top of the inclined shaft to fill the upper empty roadway and form a filling water-proof layer on the floor of the empty roadway. The second step is to construct grouting holes on both sides and the roof of the inclined well water-gushing area, and to seal the water-conducting cracks in the wellbore surrounding rock through grouting to form a water-blocking layer; The third step is to construct several drainage holes on the top plate and both sides of the inclined shaft to drain the water accumulated in the empty lanes above the inclined shaft and the water in the surrounding rock fissures; The thickness of the filling aquiclude in the first step is greater than or equal to 0.3m, the filling range covers the water gushing area of the inclined well, and extends to both sides by not less than 5m.

2. The method for controlling water inrush in an inclined shaft through an empty lane according to claim 1, characterized in that: The spacing between the filling boreholes in the first step is 3-6m, and the angle between the filling boreholes and the inclined shaft top plate is 70-90°.

3. The method for controlling water inrush in an inclined shaft through an empty tunnel according to claim 1, characterized in that: The survey borehole described in the first step is located at the end of the inclination direction of the inclined well.

4. The method for controlling water inrush in an inclined shaft through an empty tunnel according to claim 1, characterized in that: In the first step, the length L of the filling pipeline extending into the upper empty tunnel of the inclined shaft is the same, 0.3m<L<0.5m.

5. The method for controlling water inrush in an inclined shaft through an empty tunnel according to claim 1, characterized in that: In the second step, a safety distance of 500 mm or more is left between the grouting borehole and the empty tunnel and the filling waterproof layer.

6. The method for controlling water inrush in an inclined shaft through an empty tunnel according to claim 1, characterized in that: The drainage drilling holes mentioned in the third step are dispersedly arranged, with a number of no less than 2.

7. The method for controlling water inrush in an inclined shaft through an empty lane according to claim 1, characterized in that: The drainage borehole located on the top plate in the third step passes through the filling waterproof layer and enters the empty tunnel. The diameter of the drainage borehole is not less than 50mm.

8. The method for controlling water inrush in an inclined shaft through an empty tunnel according to claim 1, characterized in that: The drainage holes located on both sides described in the third step are located at the bottom of the inclined shaft side, with a depth not less than the depth of the grouting holes and a diameter not less than 50 mm.

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