A grouting structure for controlling water inrush from the roof of an experimental tunnel excavated using an existing inclined shaft.

Abstract

This utility model relates to the field of underground engineering water inrush control technology, specifically a grouting structure for controlling water inrush in the roof of an experimental tunnel excavated using an existing inclined shaft. The purpose is to provide a grouting structure for controlling water inrush in the roof of an experimental tunnel excavated using an existing inclined shaft, thereby solving the problem of water inrush in the roof of the experimental tunnel. The technical solution is a grouting structure for controlling water inrush in the roof of an experimental tunnel excavated using an existing inclined shaft, including an inclined shaft and an experimental tunnel connected to the inclined shaft; its characteristic is that it also includes a grouting chamber located on the side of the inclined shaft facing closer to the experimental tunnel and below the experimental tunnel; the grouting chamber is formed by drilling to create several upwardly inclined drainage holes and grouting holes that extend radially above the experimental tunnel.

Description

Technical Field

[0001] This utility model relates to the field of underground engineering water inrush control technology, specifically a grouting structure for water inrush control using the roof slab of an existing inclined shaft excavation experimental tunnel. Background Technology

[0002] As underground engineering construction continues to advance deeper, excavating new underground spaces using existing inclined shafts has become a common construction method. During the excavation of experimental tunnels using existing inclined shafts, water inrush from the tunnel roof poses a serious threat to project safety and hinders construction progress. When excavation reaches the aquifer area above the tunnel roof, large amounts of groundwater will flow into the tunnel through cracks in the roof, causing not only water seepage and delamination, but also potentially triggering collapses, leading to equipment damage, casualties, and project delays.

[0003] Traditional methods for controlling water inrush (such as open ditch drainage, wellpoint dewatering, and conventional grouting) are ill-suited to the specific needs of controlling water inrush under the unique locational relationship between the existing inclined shaft and the experimental tunnel. Specifically, open ditch drainage is inefficient under high-pressure water inrush conditions, making it difficult to promptly drain large amounts of accumulated water; wellpoint dewatering is challenging to implement in complex underground spaces and may adversely affect the existing inclined shaft structure; and conventional grouting cannot accurately cover the water inrush area, failing to create an effective water barrier.

[0004] Therefore, it is of great significance to design and develop a grouting structure that utilizes the existing inclined shaft to treat water inrush from the roof of an experimental tunnel to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings in the above-mentioned background technology and provide a grouting structure for treating water inrush at the top of an experimental tunnel using existing inclined shaft excavation, so as to solve the problem of water inrush at the top of the experimental tunnel.

[0006] The technical solution of this utility model is: A grouting structure for controlling water inrush from the roof of an experimental tunnel excavated using an existing inclined shaft includes an inclined shaft and an experimental tunnel connected to the inclined shaft; characterized in that it further includes a grouting chamber located on the side of the inclined shaft facing closer to the experimental tunnel and below the experimental tunnel; the grouting chamber is formed by drilling to create several drainage holes and grouting holes that extend upwards and radially above the experimental tunnel.

[0007] The inclination angle of the drainage hole is greater than that of the grouting hole.

[0008] The drainage hole extends from the grouting chamber to the water outlet fissure above the experimental tunnel.

[0009] The number of drainage holes is 3-5, and the opening diameter of the drainage holes is 42mm.

[0010] The grouting holes extend from the grouting chamber to the stable medium sandstone layer above the experimental tunnel, and the area above the experimental tunnel is covered with grouting holes.

[0011] The grouting hole has an opening diameter of 113 mm and a final hole diameter of 75 mm.

[0012] The beneficial effects of this utility model are: 1. The radially arranged drainage holes can accurately locate the water outlet point on the roof of the experimental tunnel; at the same time, the inclined angle design of the drainage holes can utilize the slope of the existing inclined shaft to achieve natural drainage of the gushing water, effectively reducing the water pressure on the roof of the experimental tunnel and creating safe conditions for subsequent grouting operations. 2. The radially arranged grouting holes, combined with high-flow pumps and high-pressure grouting, ensure that the grouting material fully fills the cracks and pores in the roof of the experimental tunnel, ultimately forming a continuous and complete water-proof curtain, blocking the channels for groundwater inflow from the source, and significantly improving the effect of water inflow control. 3. This utility model makes full use of the existing space conditions of the inclined shaft for drilling and grouting operations, without the need to open up additional construction sites, reducing construction difficulty and impact on the surrounding environment; at the same time, by effectively controlling the water inrush problem, it can avoid safety accidents such as roof water splashing, delamination and collapse, protect the personal safety of construction personnel, and ensure that the project proceeds smoothly as planned. Attached Figure Description

[0013] Figure 1 This is a top view of the structure of this utility model.

[0014] Figure 2 This is a cross-sectional structural diagram of the drainage hole and grouting hole of this utility model.

[0015] Attached diagram labels: 1. Inclined shaft; 2. Experimental tunnel; 3. Grouting chamber; 4. Drainage hole; 5. Grouting hole. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0017] like Figure 1 and Figure 2 As shown, a grouting structure for controlling water inrush from the roof of an experimental tunnel excavated using an existing inclined shaft includes an inclined shaft 1, an experimental tunnel 2, a grouting chamber 3, a drainage hole 4, and a grouting hole 5.

[0018] The inclined shaft descends at a certain slope (in this embodiment, the slope of the inclined shaft is 24°), and a horizontally extending experimental tunnel is excavated in the inclined shaft.

[0019] The inclined shaft also excavates a grouting chamber, located at least 20 meters below the experimental tunnel, and situated on the side of the inclined shaft facing the experimental tunnel. The grouting chamber is formed by drilling to create drainage and grouting holes.

[0020] The drainage holes are used to divert water in advance, reduce water pressure on the tunnel roof, and provide conditions for subsequent grouting.

[0021] The drainage holes extend radially upwards from the grouting chamber to the water-exit fissures above the roof of the experimental tunnel. Water accumulated in the aquifer is automatically discharged into the inclined shaft through these drainage holes. The radial drainage holes accurately locate the water-exit fissures in the roof of the experimental tunnel. The inclination angle of the drainage holes is greater than that of the grouting holes, and the terminal position of the drainage holes is higher than that of the grouting pipe. There are 3-5 drainage holes (the number should not be excessive; just enough to locate the water-exit fissures and meet drainage requirements), and the opening diameter of the drainage holes is 42mm.

[0022] The grouting holes are used to fill fissures and pores to form a waterproof curtain. The grouting holes extend radially upwards from the grouting chamber to the stable medium sandstone subbase above the top of the experimental tunnel. The radial arrangement of the grouting holes ensures effective filling of the grouting material. The number of grouting holes is determined as needed, ensuring that the grouting holes completely cover the entire experimental tunnel; that is, the top of the experimental tunnel is covered with grouting holes, with some extending to the top of the entire experimental tunnel.

[0023] The grouting borehole is located 2m above the bottom plate of the grouting chamber. The opening diameter of the grouting borehole is 113mm, and the final diameter of the grouting borehole is 75mm. The drilling depth of the grouting borehole is set according to the layout of the experimental tunnel to ensure that the grouting borehole can penetrate the aquifer above the top plate of the experimental tunnel.

[0024] The grouting hole has a built-in φ89mm grouting pipe and is equipped with a high-flow pump for high-pressure, high-flow grouting operations, which allows the grouting material to fully fill the water-outflow cracks above the top of the experimental tunnel, forming a water-proof curtain.

[0025] The working principle of this utility model: 1. Drill drainage holes in the grouting chamber to the water outlet fissure above the experimental tunnel to naturally divert the accumulated water to the inclined shaft and avoid water inrush problems.

[0026] 2. Drill grouting holes in the grouting chamber to the medium sandstone stabilization layer above the experimental tunnel, and grout through the grouting holes to fully fill the cracks and pores above the top plate of the experimental tunnel, forming a continuous and effective water-proof curtain.

[0027] The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

Claims

1. A grouting structure for controlling water inrush from the roof of an experimental tunnel excavated using an existing inclined shaft, comprising an inclined shaft (1) and an experimental tunnel (2) connected to the inclined shaft; characterized in that: It also includes a grouting chamber (3) located on the side of the inclined shaft facing close to the experimental tunnel and below the experimental tunnel; the grouting chamber is formed by drilling to form a number of drainage holes (4) and grouting holes (5) that extend upwards to the top of the experimental tunnel and are distributed radially.

2. The grouting structure for controlling water inrush from the roof of an experimental tunnel excavated using an existing inclined shaft, as described in claim 1, is characterized in that: The inclination angle of the drainage hole is greater than that of the grouting hole.

3. The grouting structure for controlling water inrush from the roof of an experimental tunnel excavated using an existing inclined shaft, as described in claim 2, is characterized in that: The drainage hole extends from the grouting chamber to the water outlet fissure above the experimental tunnel.

4. The grouting structure for controlling water inrush from the roof of an experimental tunnel excavated using an existing inclined shaft, as described in claim 3, is characterized in that: The number of drainage holes is 3-5, and the opening diameter of the drainage holes is 42mm.

5. A grouting structure for controlling water inrush from the roof of an experimental tunnel excavated using an existing inclined shaft, as described in claim 4, is characterized in that: The grouting holes extend from the grouting chamber to the stable medium sandstone layer above the experimental tunnel, and the area above the experimental tunnel is covered with grouting holes.

6. A grouting structure for controlling water inrush from the roof of an experimental tunnel excavated using an existing inclined shaft, as described in claim 5, is characterized in that: The grouting hole has an opening diameter of 113 mm and a final hole diameter of 75 mm.

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