CN107268547B - Karst funnel reservoir and flood discharge building and construction method thereof - Google Patents

Abstract

The invention discloses a flood discharge building, comprising a shaft section arranged in the surrounding rock body of a karst funnel and a water diversion section arranged on the inner wall of the surrounding rock body of the karst funnel, the upper end of the shaft section and the water diversion section There is a pressureless flood discharge tunnel section in between, a pressure flood discharge tunnel section is set between the lower end of the shaft section and the natural drainage channel of the karst funnel, and a gate is set between the water diversion section and the pressureless flood discharge tunnel section. The invention also discloses a karst funnel reservoir, a flood discharge building and a construction method. The flood discharge building of the present invention has the following two advantages: 1) the flood discharge of the natural drainage channel at the bottom of the karst funnel is fully utilized, so that the project scale of the flood discharge building is small and the economy is good; 2) all the water discharge structures are located in the karst funnel In the rock body of the side wall of the karst funnel, it not only does not interfere with other buildings in the karst funnel reservoir, but also has good safety.

Description

Karst funnel reservoir and its flood discharge building and construction method

technical field

The invention belongs to the technical field of water conservancy engineering, in particular to a karst funnel reservoir, a flood discharge building and a construction method.

Background technique

Karst landforms in my country are widely distributed and large, mainly in carbonate rock outcropping areas, covering an area of about 910,000 to 1.3 million square kilometers. Among them, Guangxi, Guizhou and eastern Yunnan occupy the largest area and are one of the largest karst landform areas in the world. The main karst landform areas in my country are also areas rich in atmospheric precipitation. However, due to the poor surface water storage conditions, most of the precipitation enters the underground karst system through karst funnels, which makes the surface water resources in karst landform areas not rich. There are many areas. There are even prominent seasonal water shortages, which seriously affect local economic and social development.

With the social development and technological and economic progress of our country, it is necessary to build reservoirs in karst areas to solve the local seasonal water shortage problem. Large karst funnels have good water catchment conditions on topography and good water quality. If the natural drainage channels of karst funnels are scientifically blocked, a karst funnel reservoir can be formed. As a reservoir, flood discharge structures are a must. Karst funnel reservoir is a new type of reservoir, and how to design flood discharge structures has also become one of the key technical problems to be solved urgently.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide a karst funnel reservoir and its flood discharge building and construction method, which can meet the flood discharge requirements of the reservoir.

To achieve the above object, the present invention provides the following technical solutions:

The present invention first proposes a flood discharge building, comprising a shaft section arranged in the surrounding rock mass of the karst funnel and a water diversion section arranged on the inner wall of the surrounding rock mass of the karst funnel, the upper end of the shaft section and the water diversion section There is a pressureless flood discharge tunnel section between them, a pressure flood discharge tunnel section is set between the lower end of the shaft section and the natural drainage channel of the karst funnel, and a gate is set between the water diversion section and the pressureless flood discharge tunnel section .

Further, the cross section of the water diversion section is a straight wall semi-circular arch or a circle, and the gate is an arc gate that matches the water diversion section; the cross-sectional shape of the pressureless flood discharge tunnel section is the same as that of the water diversion section. The cross-section of the outlet is the same.

Further, the top surface elevation of the water inlet of the pressureless flood discharge tunnel section is not higher than the top surface elevation of the water outlet of the water diversion section.

Further, the vertical shaft section and the arc transition between the pressureless flood discharge tunnel section and the pressure flood discharge tunnel section respectively.

Further, the elevation of the bottom surface of the water outlet of the pressure flood discharge tunnel section is not lower than the elevation of the natural drainage channel of the karst funnel.

The present invention also proposes a karst funnel reservoir, which includes a plugging structure for plugging the natural drainage channel of the karst funnel, the plugging structure and the surrounding rock mass of the karst funnel located on the upper part of the karst funnel are formed for storage A water storage area with water and anti-leakage treatment; the water storage area is provided with a water intake structure for water intake, an emptying structure for emptying the water storage area and the flood discharge structure as described above; the water diversion section has a The water inlet is located above the blocking building, and the elevation of the water inlet of the water diversion section is lower than the normal water level of the water storage area; the water outlet of the pressure flood discharge tunnel section is located below the blocking building ;

The emptying structure is arranged at the bottom of the water storage area, and the water intake structure is arranged in the middle of the water storage area.

Further, the elevation of the bottom surface of the water inlet of the empty building is equal to or slightly lower than the elevation of the dead water level of the water storage area.

Further, a water delivery pipeline is connected to the water intake structure, and the elevation of the water intake of the water intake structure is located between the dead water level elevation and the normal water level elevation of the water storage area.

The present invention also proposes a construction method for the flood discharge building as described above, comprising the following steps:

1) Rock mass excavation: excavate the water diversion section, the unpressured flood discharge tunnel section, the shaft section and the pressure flood discharge tunnel section in the surrounding rock mass of the karst funnel, and reinforce the surrounding rock;

2) Structural construction: construct the structure of the diversion section, the gate and its opening and closing facilities, the unpressurized flood discharge tunnel section, the shaft section and the pressure flood discharge tunnel section in the excavated cavern to form the flood discharge building.

Further, in the step 1), the waste slag produced by the excavation shall not be landfilled at the bottom of the karst funnel; the excavation construction of the rock mass shall not block the natural drainage channel at the bottom of the karst funnel.

The beneficial effects of the present invention are:

The flood discharge building of the present invention has the following two advantages:

1) Make full use of the natural drainage channel at the bottom of the karst funnel to release the flood flow, so that the project scale of the flood discharge building is small and the economy is good;

2) The drainage structures are all located in the rock body of the side wall of the karst funnel, which not only does not interfere with other buildings in the karst funnel reservoir, but also has good safety.

Description of drawings

In order to make the purpose, technical solutions and beneficial effects of the present invention clearer, the present invention provides the following drawings for description:

Fig. 1 is the structural representation of the karst funnel reservoir embodiment of the present invention, specifically, omits water intake buildings and emptying buildings;

Fig. 2 is the sectional view of Fig. 1;

Figure 3 is a schematic structural diagram of a flood discharge building.

Detailed ways

The present invention is further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

As shown in FIG. 1 , it is a schematic structural diagram of an embodiment of a karst funnel reservoir of the present invention. The karst funnel reservoir in this embodiment includes a blocking building 2 for blocking the natural drainage channel of the karst funnel. The blocking building 2 and the surrounding rock mass 1 of the karst funnel located on the upper part of the blocking building 2 are formed for water storage and Water storage area 3 with anti-seepage treatment. The water storage area 3 is provided with a water intake structure for water intake, an emptying structure for emptying the water storage area, and a flood discharge structure 4 for flood discharge. The flood discharge structure of this embodiment includes a shaft section 5 arranged in the surrounding rock mass 1 of the karst funnel and a water diversion section 6 arranged on the inner wall of the surrounding rock mass 1 of the karst funnel. The upper end of the shaft section 5 and the water diversion section 6 There is a pressureless flood discharge tunnel section 7 in between, a pressure flood discharge tunnel section 8 is arranged between the lower end of the shaft section 5 and the natural drainage channel 10 of the karst funnel, and a gate 9 is arranged between the water diversion section 6 and the pressureless flood discharge tunnel section 7 . In this embodiment, the water inlet of the water diversion section 6 is located above the blocking building 2 , and the elevation of the water inlet of the water diversion section 6 is lower than the normal water level of the water storage area 3 . The water outlet of the pressure flood discharge tunnel section 8 is located below the blocking building 2 .

The emptying structure is arranged at the bottom of the water storage area 3 , and the water intake structure is arranged in the middle of the water storage area 3 . The elevation of the bottom surface of the water inlet of the empty building is equal to or slightly lower than the dead water level of the water storage area 3. The water intake structure is connected with a water delivery pipeline, and the water intake elevation of the water intake structure is located between the dead water level elevation of the water storage area 3 and the normal water level elevation.

In the karst funnel reservoir of the present embodiment, the natural drainage channel of the karst funnel is blocked by the sealing structure, and the surrounding rock mass of the karst funnel for water storage and anti-seepage is formed between the sealing structure and the surrounding rock mass of the karst funnel located on the upper part of the sealing structure. The treated water storage area makes the karst funnel meet the conditions for storing surface water to form a reservoir; emptying the building can empty the reservoir so that various buildings in the reservoir area can be repaired; the flood discharge building can drain the excess water in time to ensure the reservoir. Safe operation; water intake structures can be connected to water pipelines, and water can be taken for production and living; in addition, due to the limited pollution sources around the karst funnel, and the problem of soil erosion is not serious, therefore, the problem of sediment deposition in the karst funnel reservoir is not prominent, and the reservoir The water quality is also better.

Further, the cross section of the water diversion section 6 is a straight wall semi-circular arch or a circle, and the gate 9 is an arc gate matched with the water diversion section 6, so that it can be smoothly opened during flood discharge. The cross-sectional shape of the pressureless flood discharge tunnel section 7 is the same as that of the water outlet of the water diversion section 6 . The cross section of the water diversion section 6 in this embodiment is a straight wall semi-circular arch. Preferably, the top surface elevation of the water inlet of the pressureless flood discharge tunnel section 7 is not higher than the top surface elevation of the water outlet of the water diversion section, and the top surface elevation of the water inlet of the non-pressure flood discharge tunnel section 7 of this embodiment is lower than Top elevation.

Further, the vertical shaft section 5 and the unpressurized flood discharge tunnel section 7 and the pressure flood discharge tunnel section 8 are respectively transitioned in arcs, so that the water flow is smooth. The elevation of the bottom surface of the water outlet of the pressured flood discharge tunnel section 8 is not lower than the elevation of the natural drainage channel 10 of the karst funnel, so that all the water in the flood discharge building can be drained away.

The flood discharge building of this embodiment has the following two advantages: 1) the flood discharge flow of the natural drainage channel at the bottom of the karst funnel is fully utilized, so that the project scale of the flood discharge building is small and the economy is good; 2) the flood discharge buildings are all located in the karst The rock body of the side wall of the funnel not only does not interfere with other buildings in the karst funnel reservoir, but also has good safety.

The present embodiment also proposes a construction method for a flood discharge building, comprising the following steps:

1) Rock mass excavation: excavate the water diversion section, the unpressured flood discharge tunnel section, the shaft section and the pressure flood discharge tunnel section in the surrounding rock mass of the karst funnel, and reinforce the surrounding rock; the spoil generated by the excavation shall not be landfilled. The bottom of the karst funnel; the excavation of the rock mass cannot block the natural drainage channel at the bottom of the karst funnel;

2) Structural construction: construct the structure of the diversion section, the gate and its opening and closing facilities, the unpressurized flood discharge tunnel section, the shaft section and the pressure flood discharge tunnel section in the excavated cavern to form flood discharge structures.

The above-mentioned embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the present invention is subject to the claims.

Claims (5)

1. A karst funnel reservoir is characterized in that: comprising a plugging building for plugging the natural drainage channel of the karst funnel, and the surrounding rock mass of the karst funnel being positioned between the plugging building and the karst funnel is formed for A water storage area with water storage and anti-leakage treatment; the water storage area is provided with a water intake structure for water intake, an emptying structure for emptying the water storage area and a flood discharge structure; The emptying structure is arranged at the bottom of the water storage area, and the water intake structure is arranged in the middle of the water storage area; The flood discharge building comprises a shaft section arranged in the surrounding rock body of the karst funnel and a water diversion section arranged on the inner wall of the surrounding rock body of the karst funnel, and the water inlet of the water diversion section is located above the blocking building, And the water inlet elevation of the water diversion section is lower than the normal water level elevation of the water storage area; the water outlet of the pressure flood discharge tunnel section is located below the blocking building; the upper end of the vertical shaft section and the water diversion section are located between There is a pressureless flood discharge tunnel section, a pressure flood discharge tunnel section is set between the lower end of the shaft section and the natural drainage channel of the karst funnel, and a gate is arranged between the water diversion section and the pressureless flood discharge tunnel section, so the The elevation of the bottom surface of the outlet of the tunnel section with pressured flood discharge shall not be lower than the elevation of the natural drainage channel of the karst funnel; The cross section of the water diversion section is a straight wall semi-circular arch or a circle, and the gate is an arc gate matched with the water diversion section; The cross section of the nozzle is the same; The elevation of the water inlet top surface of the pressureless flood discharge tunnel section is not higher than the top surface elevation of the water outlet of the water diversion section; The vertical shaft section is respectively connected with the arc transition between the pressureless flood discharge tunnel section and the pressure flood discharge tunnel section. 2 . The karst funnel reservoir according to claim 1 , wherein the elevation of the bottom surface of the water inlet of the emptying building is equal to or slightly lower than the elevation of the dead water level of the water storage area. 3 . 3. karst funnel reservoir according to claim 1, is characterized in that: described water intake structure is connected with water conveyance pipeline, and the water intake elevation of described water intake structure is located in the dead water level elevation of described water storage area and the normal water level elevation. 4. a construction method of the flood discharge building of karst funnel reservoir as claimed in claim 1, is characterized in that: comprise the steps: 1) Rock mass excavation: excavate the water diversion section, the unpressured flood discharge tunnel section, the shaft section and the pressure flood discharge tunnel section in the surrounding rock mass of the karst funnel, and reinforce the surrounding rock; 2) Structural construction: construct the structure of the diversion section, the gate and its opening and closing facilities, the unpressurized flood discharge tunnel section, the shaft section and the pressure flood discharge tunnel section in the excavated cavern to form the flood discharge building. 5. the construction method of the flood discharge building of a kind of karst funnel reservoir according to claim 4, is characterized in that: in step 1), the spoiled slag that excavation produces shall not be landfilled at the bottom of karst funnel; rock mass excavation construction The natural drainage channels at the bottom of the karst funnel cannot be blocked.

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