Karst area tunnel body leakage pressure drainage system

Abstract

A karst area tunnel body leakage pressure drainage system comprises a tunnel main hole, a central drainage ditch and a main hole maintenance channel are arranged in the tunnel main hole, a longitudinal section water collecting and settling gallery is arranged along a karst pipeline and parallel to the tunnel main hole, and karst underground water mixed with silt in the karst pipeline is guided and drained to the longitudinal section water collecting and settling gallery through water inlet holes. The longitudinal-section catchment precipitation gallery is communicated with the tunnel main hole through the transverse-section catchment precipitation gallery, a mud blocking wall is arranged at the end, away from the tunnel main hole, of the transverse-section catchment precipitation gallery, a grit chamber is arranged at the position, at the left end of the mud blocking wall, of the transverse-section catchment precipitation gallery and the bottom of the longitudinal-section catchment precipitation gallery, and a clear water area is formed at the right end of the mud blocking wall. The clear water area is communicated with the central drainage ditch through a water guide pipe; the utility model can effectively solve the problem that the drainage system in the karst area tunnel hole is easy to deposit silt to cause insufficient drainage capacity, relieves the drainage pressure of the drainage system in the hole, reduces the maintenance and cleaning times of the drainage system in the hole, and can exert the use function of the drainage system in the hole to the maximum extent.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel operation and maintenance equipment, and specifically relates to an external pressure relief and drainage system for a karst area tunnel. Background Art

[0002] Tunnels in karst areas often have the characteristics of developed dissolution pipelines (groundwater recharge paths). In the rainy season, surface water can flow into the cave through karst pipelines, resulting in a large instantaneous flow of groundwater recharge in the cave, mixed with a large amount of sediment and other substances. At present, tunnels in karst areas mainly lead groundwater directly to the drainage system in the cave, and then discharge it out of the cave. In this process, the drainage system in the cave is prone to siltation, and the effective drainage space will be compressed. The road surface needs to be broken for cleaning, and the subsequent operation and maintenance are more difficult. At the same time, the instantaneous recharge flow of karst groundwater is large, and the size of the drainage system in the cave is limited, which is prone to insufficient drainage capacity, causing disasters such as water leakage in the cave and lining cracks. Summary of the invention

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the above-mentioned prior art and provide an external pressure relief drainage system for a karst area tunnel which can effectively alleviate the drainage pressure of the drainage system in the cave and reduce the maintenance and cleaning times of the drainage system in the cave.

[0004] The technical solution adopted to solve the above technical problems is: an external pressure relief drainage system for a karst area tunnel, including a tunnel main tunnel, a central drainage ditch and a main tunnel inspection road are arranged in the tunnel main tunnel, a longitudinal water collection and sedimentation corridor is arranged along the karst pipeline parallel to the tunnel main tunnel, and the water inlet hole drains the karst groundwater mixed with mud and sand in the karst pipeline to the longitudinal water collection and sedimentation corridor, the longitudinal water collection and sedimentation corridor is connected with the tunnel main tunnel through the transverse water collection and sedimentation corridor, a mud retaining wall is arranged at one end of the transverse water collection and sedimentation corridor away from the tunnel main tunnel, the bottom of the transverse water collection and sedimentation corridor and the longitudinal water collection and sedimentation corridor at the left end of the mud retaining wall is a sand settling tank, and a clear water area is formed at the right end of the mud retaining wall, and the clear water area is connected with the central drainage ditch through a water guide pipe.

[0005] The utility model provides two rows of emptying holes on the mud retaining wall, and the karst water after buffering and sedimentation in the sand settling tank enters the clean water area through the emptying holes.

[0006] The utility model provides a water collection and pressure relief corridor between the horizontal water collection and sedimentation corridor and the tunnel main hole, a connecting platform is provided in the water collection and pressure relief corridor, and a water guide pipe is provided inside the connecting platform.

[0007] The water collection and pressure relief gallery of the utility model is composed of a secondary lining and a primary support structure.

[0008] The connecting platform of the utility model is provided with an inspection door.

[0009] A plurality of groups of concrete columns are arranged in the middle of the transverse water collection and sedimentation corridor and the longitudinal water collection and sedimentation corridor of the utility model, and inspection panels are arranged on the concrete columns, and the top of the inspection panel is flush with the main tunnel inspection road.

[0010] The utility model provides a central ditch inspection well at the intersection of the water guide pipe and the central drainage ditch.

[0011] The transverse water collection and sedimentation corridor and the longitudinal water collection and sedimentation corridor of the utility model are provided with a primary support structure.

[0012] The utility model provides a plurality of transverse water collection and sedimentation corridors which are connected and arranged in a longitudinal direction along the tunnel main hole; and a plurality of longitudinal water collection and sedimentation corridors which are connected and arranged in a transverse direction along the transverse water collection and sedimentation corridors.

[0013] The utility model has a plurality of water guide pipes, each of which is inclined and has a water inlet end higher than a water outlet end.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] 1. The external pressure relief drainage system for karst area tunnels provided by the utility model creates a new drainage mode with better effect, that is, the groundwater is firstly drained to the external water collection and sedimentation gallery for buffering and sedimentation, and then the clean water after deceleration and sedimentation is drained to the drainage system in the cave, and finally discharged to the ditch outside the cave.

[0016] 2. The utility model can effectively solve the problem of insufficient drainage capacity caused by silt accumulation in the drainage system of the tunnel in the karst area, effectively alleviate the drainage pressure of the drainage system in the tunnel, greatly reduce the maintenance and cleaning times of the drainage system in the tunnel, and maximize the use function of the drainage system in the tunnel.

[0017] 3. The cross-sectional size, direction and length of the water collection and sedimentation corridor of the utility model can be dynamically adjusted according to the distribution of karst pipelines, with low construction risk, low project cost and little impact on the main tunnel structure; the sand settling tank in the corridor is an open structure, and manual labor only needs to stand on the inspection panel to clean it in the later stage, which is convenient for operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural plane schematic diagram of an embodiment of the utility model.

[0019] Figure 2 yes Figure 1 Section Ⅰ-Ⅰ of the .

[0020] Figure 3 yes Figure 1 Ⅱ-Ⅱ cross-section diagram.

[0021] Figure 4 yes Figure 1Ⅲ-Ⅲ cross-section diagram.

[0022] Figure 5 yes Figure 1 Section IV-IV of the .

[0023] In the figure: 1. Tunnel main tunnel; 2. Central drainage ditch; 3. Inspection well; 4. Water guide pipe; 5. Water collection and pressure relief corridor; 6-1. Horizontal water collection and sedimentation corridor; 6-2. Vertical water collection and sedimentation corridor; 7. Inspection panel; 8. Concrete column; 9. Mud retaining wall; 10. Karst pipeline; 11. Sedimentation tank; 12. Clean water area; 13. Drainage hole; 14. Connecting platform; 15. Inspection door; 16. Main tunnel inspection road; 17 Water inlet hole. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to these embodiments.

[0025] Example 1

[0026] exist Figures 1 to 5 The utility model relates to an external pressure relief drainage system for a karst area tunnel, comprising a tunnel main tunnel 1, a central drainage ditch 2 and a main tunnel inspection road 16 are arranged in the tunnel main tunnel 1, a longitudinal water collection and sedimentation corridor 6-2 is arranged along a karst pipeline 10 parallel to the tunnel main tunnel 1, a water inlet 17 discharges karst groundwater mixed with sediment in the karst pipeline 10 to the longitudinal water collection and sedimentation corridor 6-2, the water inlet 17 is a water inlet or an artificially drilled hole, the arrangement number and position are determined according to the karst pipeline 10, the longitudinal water collection and sedimentation corridor 6-2 is connected with the tunnel main tunnel 1 through a transverse water collection and sedimentation corridor 6-1, according to the development of the karst trough and the position of the karst cave, the transverse water collection and sedimentation corridor 6-1 can be connected to be arranged in a plurality of groups along the longitudinal direction of the tunnel main tunnel 1, and the longitudinal water collection and sedimentation corridor 6-2 can be connected to be arranged in a plurality of groups along the transverse water collection and sedimentation corridor 6-1 in a plurality of groups.

[0027] Furthermore, a water collection and pressure relief corridor 5 is provided between the horizontal water collection and sedimentation corridor 6-1 and the tunnel main tunnel 1. The horizontal water collection and sedimentation corridor 6-1 and the vertical water collection and sedimentation corridor 6-2 are only provided with the initial support structure to ensure that the karst fissure water can better penetrate into the horizontal tunnel. The cross-sectional size, direction and length of the water collection and sedimentation corridor can be dynamically adjusted according to the distribution of the karst pipeline 10. The construction risk is low, the construction is convenient, the project cost is low, and the impact on the main tunnel structure is small. In this embodiment, the water collection and sedimentation corridor is an arch structure, which is illustrated by a group of horizontal water collection and sedimentation corridors 6-1 and vertical water collection and sedimentation corridors 6-2. The water collection and pressure relief corridor 5 is composed of a secondary lining and an initial support structure to ensure the long-term stability of the lining structure at the intersection of the water collection and pressure relief corridor 5 and the tunnel main tunnel 1. A connecting platform 14 is provided in the water collection and pressure relief corridor 5, and the connecting platform 14 is cast by concrete.

[0028] The bottom of the horizontal water collection and sedimentation corridor 6-1 and the vertical water collection and sedimentation corridor 6-2 is a grit chamber 11. Several groups of concrete columns 8 are arranged in the middle of the horizontal water collection and sedimentation corridor 6-1 and the vertical water collection and sedimentation corridor 6-2. Inspection panels 7 are arranged on the concrete columns 8. The top of the inspection panel 7 is flush with the main tunnel inspection road 16. The right end of the inspection panel 7 is erected on the connecting platform 14. The grit chamber 11 is an open structure. In the later stage, it only needs to open the inspection door 15 and stand on the inspection panel 7 to clean it, which is convenient for operation and maintenance.

[0029] The horizontal water collection and sedimentation corridor 6-1 is provided with a mud retaining wall 9 at one end of the tunnel main tunnel 1. The right end of the mud retaining wall 9 forms a clear water area 12 and the left end is a sand settling tank 11. Two rows of emptying holes 13 are provided on the mud retaining wall 9. The karst water after buffering and sedimentation in the sand settling tank 11 enters the clear water area 12 through the emptying holes 13. The clear water area 12 is connected to the central drainage ditch 2 through the water guide pipe 4 set in the connecting platform 14. There are several groups of water guide pipes 4. The size and number of water guide pipes 4 can be dynamically adjusted according to the groundwater conditions. Each group of water guide pipes 4 is tilted and the water inlet end is higher than the water outlet end. A central ditch inspection well 3 is set at the intersection of the water guide pipe 4 and the central drainage ditch 2 to facilitate later maintenance and repair.

[0030] The working principle of the utility model is as follows:

[0031] The karst groundwater mixed with sediment is discharged to the longitudinal water collection and sedimentation corridor 6-2 and the transverse water collection and sedimentation corridor 6-1 in sequence through the water inlet hole 17, and is buffered and precipitated in the grit chamber 11. The karst water after buffering and sedimentation enters the clean water area 12 through the drain hole 13, and is then discharged to the central drainage ditch 2 and the inspection well 3 through the water guide pipe 4, and finally discharged to the ditch outside the cave.

Claims

1. An external pressure relief drainage system for a karst area tunnel, characterized by: The invention comprises a tunnel main tunnel (1), a central drainage ditch (2) and a main tunnel inspection road (16) are arranged in the tunnel main tunnel (1), a longitudinal water collection and sedimentation corridor (6-2) is arranged along a karst pipeline (10) parallel to the tunnel main tunnel (1), a water inlet hole (17) discharges karst groundwater mixed with silt in the karst pipeline (10) to the longitudinal water collection and sedimentation corridor (6-2), and the longitudinal water collection and sedimentation corridor (6-2) is connected to the transverse water collection and sedimentation corridor ( 6-1) is connected to the tunnel main tunnel (1), a mud retaining wall (9) is arranged at one end of the transverse water collection and sedimentation corridor (6-1) away from the tunnel main tunnel (1), a sand settling tank (11) is formed at the bottom of the transverse water collection and sedimentation corridor (6-1) and the longitudinal water collection and sedimentation corridor (6-2) at the left end of the mud retaining wall (9), and a clear water area (12) is formed at the right end of the mud retaining wall (9), and the clear water area (12) is connected to the central drainage ditch (2) through a water guide pipe (4).

2. The external pressure relief drainage system for a karst area tunnel according to claim 1, characterized in that: The mud retaining wall (9) is provided with two rows of drain holes (13), and the karst water after buffering and sedimentation in the sand settling tank (11) enters the clean water area (12) through the drain holes (13).

3. The external pressure relief drainage system for a karst area tunnel according to claim 1, characterized in that: A water collection and pressure relief corridor (5) is arranged between the transverse water collection and sedimentation corridor (6-1) and the tunnel main tunnel (1), a connecting platform (14) is arranged in the water collection and pressure relief corridor (5), and a water conduit (4) is arranged inside the connecting platform (14).

4. The external pressure relief drainage system for a karst area tunnel according to claim 3 is characterized by: The water collection and pressure relief gallery (5) is composed of a secondary lining and a primary support structure.

5. The external pressure relief drainage system for a karst area tunnel according to claim 3, characterized in that: The connecting platform (14) is provided with an inspection door (15).

6. The external pressure relief drainage system for a karst area tunnel according to claim 1, characterized in that: A plurality of groups of concrete columns (8) are arranged in the middle of the transverse water collection and sedimentation corridor (6-1) and the longitudinal water collection and sedimentation corridor (6-2), and an inspection panel (7) is arranged on the concrete column (8), and the top of the inspection panel (7) is flush with the main tunnel inspection road (16).

7. The external pressure relief drainage system for a karst area tunnel according to claim 1, characterized in that: A central ditch inspection well (3) is provided at the intersection of the water guide pipe (4) and the central drainage ditch (2).

8. The external pressure relief drainage system for a karst area tunnel according to claim 1, characterized in that: The transverse water collection and sedimentation corridor (6-1) and the longitudinal water collection and sedimentation corridor (6-2) are provided with a primary support structure.

9. The external pressure relief drainage system for a karst area tunnel according to claim 1, characterized in that: The transverse water collection and sedimentation corridors (6-1) are connected in a plurality of groups along the longitudinal direction of the tunnel main tunnel (1); and the longitudinal water collection and sedimentation corridors (6-2) are connected in a plurality of groups along the transverse direction of the transverse water collection and sedimentation corridors (6-1).

10. The external pressure relief drainage system for a karst area tunnel according to claim 1, characterized in that: The water guide pipes (4) are arranged in a plurality of groups, and each group of water guide pipes (4) is arranged obliquely and the water inlet end is higher than the water outlet end.

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