CN116695852A

CN116695852A - Seepage well system

Info

Publication number: CN116695852A
Application number: CN202310380297.8A
Authority: CN
Inventors: 周涛; 张园园; 刘建友; 吕刚; 于晨昀; 岳岭; 刘方; 陈志广; 徐治中; 郭磊; 彭斌; 胡晶; 王杨; 魏盼; 凌云鹏; 答子虔; 王磊; 张宇宁; 张斌; 金张澜
Original assignee: Beijing Geological Environment Monitoring Institute; Beijing Institute Of Engineering Geology; China Railway Engineering Consulting Group Co Ltd
Current assignee: Beijing Geological Environment Monitoring Institute; Beijing Institute Of Engineering Geology; China Railway Engineering Consulting Group Co Ltd
Priority date: 2023-04-11
Filing date: 2023-04-11
Publication date: 2023-09-05

Abstract

The invention relates to a tunnel and underground engineering technology, in particular to a seepage well system which can realize the drainage of a tunnel outlet safely, reliably, economically and environmentally friendly, comprising: a drain pipe connected to the tunnel outlet; a drain detector disposed within the drain pipe; a sewage treatment system connected to the drain pipe via a sewage valve; a percolating well connected to the drain pipe via a percolating valve; wherein when the blowdown detector detects that the quality of the drain water in the drain pipe is acceptable, the sewage valve is closed and the water seepage valve is opened to allow the drain water to flow to the water seepage well; when the blowdown detector detects that the quality of the drain water in the drain pipe is unacceptable, the water penetration valve is closed and the sewage valve is opened to allow drain water to flow to the sewage treatment system.

Description

Seepage well system

Technical Field

The invention relates to a tunnel and underground engineering technology, in particular to a water seepage well system.

Background

Along with the large-scale construction of projects such as railways, highways, urban rail transit, municipal pipe galleries and the like in China, a large number of tunnels are constructed in mountain and cities, and the excavation of the tunnels changes the original seepage field of underground water, in particular to drainage type tunnels. The original underground water in the mountain is discharged in a large amount, thereby wasting valuable underground water resources. In addition, the discharged groundwater flows out from the tunnel inlet or outlet, a proper discharge path is needed, otherwise, surrounding farmlands or other structures are easily submerged, and property loss is caused.

First, regarding groundwater resource protection, the tunnel changes the original groundwater seepage path and groundwater seepage field, and a large amount of groundwater is discharged, resulting in a drop of groundwater level, affecting the growth of ground vegetation, thus requiring consideration for protecting groundwater resources to reduce the influence on the ecosystem.

Second, with respect to the discharge of the tunnel outlet groundwater, the discharge groundwater needs to have a suitable discharge path at the tunnel outlet. If there are rivers and lakes near the tunnel exit and the amount of groundwater discharged meets the capacity of the ground water bodies, a drainage ditch may be generally provided to guide the groundwater discharged from the tunnel to the ground water bodies. If there is no capacity for groundwater to be consumed near the tunnel exit, a large amount of discharged groundwater may flood the fertile farmland and the agricultural house, resulting in a secondary disaster.

Thirdly, with respect to prevention of groundwater pollution, the operating environment in a tunnel, leakage of transported goods, wastewater generated during operation, etc. tend to contaminate groundwater in a drainage ditch in a tunnel, which necessarily results in groundwater pollution if contaminated groundwater directly infiltrates into the ground. Therefore, there is a need to effectively identify the pollution of the groundwater discharged from the tunnel and to treat the water according to the pollution.

Fourth, regarding freezing prevention, in northern cold areas, groundwater discharged from a tunnel outlet tends to freeze in a large area, and blocking a drainage path causes unsmooth drainage, so that ponding occurs in the tunnel to jeopardize driving safety. It is therefore necessary to consider the freeze protection treatment of the tunnel exit drainage.

Disclosure of Invention

The embodiment of the invention provides a seepage well system which can realize drainage at a tunnel outlet safely, reliably, economically and environmentally.

According to one aspect of the present invention, there is provided an osmotic well system for draining water at a tunnel exit, comprising:

a drain pipe connected to the tunnel outlet;

a drain detector disposed within the drain pipe;

a sewage treatment system connected to the drain pipe via a sewage valve;

a percolating well connected to the drain pipe via a percolating valve;

wherein when the blowdown detector detects that the quality of the drain water in the drain pipe is acceptable, the sewage valve is closed and the water seepage valve is opened to allow the drain water to flow to the water seepage well; when the blowdown detector detects that the quality of the drain water in the drain pipe is unacceptable, the water penetration valve is closed and the sewage valve is opened to allow drain water to flow to the sewage treatment system.

Preferably, in any embodiment, the drain pipe is coated with an insulating layer.

Preferably, in any embodiment, a heat insulation structure is arranged at the inlet of the seepage well.

Preferably, in any embodiment, the blowdown detector comprises a PH monitor.

Preferably, in any embodiment, when the PH monitor detects that the PH value of the drain water in the drain pipe is 6-10, the quality of the drain water is qualified.

Preferably, in any embodiment, a cover plate is arranged at the wellhead of the percolating well.

Preferably, in any embodiment, a filtering structure is arranged at the upper part in the infiltration well, and the filtering structure comprises from top to bottom: an upper pebble silt-preventing filter layer; an upper geotextile layer; a middle coarse sand and sediment filter layer; a lower geotextile layer; a lower layer of broken stone sediment-proof filter layer; and a supporting plate.

Preferably, in any embodiment, a plurality of conical water permeable holes are provided in the pallet.

Preferably, in any embodiment, the support plate is provided with a plurality of water permeable holes, and the hole diameter is below 0.5cm.

Preferably, in any embodiment, the water permeable hole opening rate in the supporting plate is not less than 15%.

The seepage well system provided by the embodiment of the invention can realize the drainage of the tunnel outlet safely, reliably, economically and environmentally-friendly.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following discussion will discuss the embodiments or the drawings required in the description of the prior art, and it is obvious that the technical solutions described in connection with the drawings are only some embodiments of the present invention, and that other embodiments and drawings thereof can be obtained according to the embodiments shown in the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a top view of an osmotic well system according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of an osmotic well system according to an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings, wherein it is apparent that the embodiments described are only some, but not all embodiments of the present invention. All other embodiments, which can be made by a person of ordinary skill in the art without the need for inventive faculty, are within the scope of the invention, based on the embodiments described in the present invention.

a drain pipe connected to the tunnel outlet;

a drain detector disposed within the drain pipe;

a sewage treatment system connected to the drain pipe via a sewage valve;

a percolating well connected to the drain pipe via a percolating valve;

In this way, the drainage detector can ensure that only the tunnel drainage with qualified water quality is discharged into the groundwater circulation system again through the drainage pipe, and the drainage with unqualified water quality is led to the sewage treatment system for treatment (and can be discharged into the groundwater system after the treatment is finished and meets the qualification requirement), so that the drainage with qualified water quality flows back into the groundwater system through the seepage well under the condition of avoiding groundwater pollution, thereby maintaining groundwater balance and reducing the influence of tunnel engineering on natural ecological environment.

Therefore, the dewatering well system provided by the embodiment of the invention can safely, reliably, economically and environmentally-friendly realize drainage of the tunnel outlet.

Alternatively, in one embodiment, a plurality of percolating wells may be provided for a single tunnel portal, each percolating well being connectable to a tunnel outlet, for example, each by means of a drain, as required.

Alternatively, in one embodiment, a site with good drainage conditions is selected to set the drainage well based on the formation conditions revealed by the borehole.

Optionally, in one embodiment, parameters of the percolating well, such as number, diameter, well depth, etc., are determined according to the permeability coefficient of each layer of rock-soil mass and the tunnel drainage.

Optionally, in one embodiment, the drain pipe has a burial depth greater than a local maximum freezing depth. In cold climates, the burial depth of the drain pipe is large enough, meaning that the risk of freezing the drain pipe is significantly reduced, so that the risk of damage (such as unsmooth or blockage of tunnel drainage, etc.) caused by freezing of tunnel drainage in the drain pipe in a low-temperature environment can be avoided. It will be appreciated that the climatic and geological conditions are different for different construction areas and that the local maximum freezing depth can be adjusted as required.

Preferably, in any embodiment, the drain pipe is coated with an insulating layer. In this way, it may be advantageous to reduce the risk of the drain freezing, especially if the drain burial is small (e.g., less than the local maximum freezing depth). Optionally, in one embodiment, the insulation layer comprises a polyurethane insulation layer.

Preferably, in any embodiment, a heat insulation structure is arranged at the inlet of the seepage well. Therefore, the risk of freezing of the percolating well can be reduced, particularly under the condition that the inlet of the percolating well is arranged shallower, and the risk of damage (such as unsmooth drainage or blockage of the percolating well and the like) caused by freezing of the percolating well in a low-temperature environment can be avoided. Optionally, in one embodiment, the insulation structure comprises a polyurethane insulation structure.

Optionally, in one embodiment, one or more heat insulation layers are arranged at the inlet of the seepage well. Thus, the seepage well can be prevented from freezing, and particularly, the underground water in the well can be prevented from being frozen due to the fact that cold air enters the seepage well in winter.

Alternatively, in one embodiment, the insulating layer has a thickness of 10 to 30cm.

Alternatively, in one embodiment, the insulating layer may be made of one or a combination of the following materials: polyurethane foam, polystyrene board, polystyrene foam (EPS), extruded polystyrene foam (XPS), phenolic foam.

Preferably, in any embodiment, the blowdown detector comprises a PH monitor.

Optionally, in one embodiment, a plurality of PH monitors are provided.

Alternatively, in one embodiment, the waste valve and the permeate valve are independent of each other.

Optionally, in one embodiment, the sewage valve and the permeate valve are integrated.

Optionally, in one embodiment, a water seepage stop structure is provided at the wellhead of the water seepage well, against which the water seepage valve comes to stop when closed. Therefore, through cooperation of the water seepage valve and the water seepage stopping structure, the water seepage valve can be prevented from excessively deflecting to cause leakage, and therefore the waterproof effect of the water seepage valve is effectively improved.

Optionally, in one embodiment, the water penetration stop is provided on an inner wall of the drain pipe.

Optionally, in one embodiment, the water penetration stop structure comprises a water penetration stop.

Optionally, in one embodiment, the water penetration stop structure comprises a surface elastic structure.

Optionally, in one embodiment, the water penetration stop structure comprises a surface seal structure.

Optionally, in one embodiment, a sewage stop structure is provided on the inner wall of the drain pipe against which the sewage valve stops when closed. Thus, through the cooperation of the sewage valve and the sewage stop structure, the leakage caused by excessive deflection of the sewage valve can be prevented, and the waterproof effect of the sewage valve is effectively improved.

Optionally, in one embodiment, the sewage stop structure comprises a sewage stop.

Optionally, in one embodiment, the sewage stop structure comprises a surface elastic structure.

Optionally, in one embodiment, the sewage stop structure comprises a surface seal structure.

Optionally, in one embodiment, the drain is connected to the sewage treatment system via a sewage reservoir.

Optionally, in one embodiment, the sewage valve and the water infiltration valve are integrated into a valve structure comprising: a valve member pivotable between a first position in which the valve member closes the waste valve and the permeate valve opens to allow drainage to flow to the permeate well and a second position in which the valve member closes the permeate valve and the waste valve opens to allow drainage to flow to the waste treatment system.

Optionally, in one embodiment, the valve member comprises a valve plate pivotable between a first position and a second position.

Optionally, in one embodiment, one end of the valve plate is pivotally mounted to an inner wall of the drain pipe, and the other end is pivotable between a first position extending parallel to the drain pipe axis (with the waste valve closed and the permeate valve open) and a second position extending perpendicular to the drain pipe axis (with the permeate valve closed and the waste valve open).

Alternatively, in another embodiment, one end of the valve plate is pivotally mounted to the inner wall of the drain pipe and the other end is pivotable between a first position extending perpendicular to the drain pipe axis (with the waste valve closed and the waste valve open) and a second position extending parallel to the drain pipe axis (with the waste valve closed and the waste valve open).

Optionally, in one embodiment, the valve plate pivots through 90 degrees between one position extending parallel to the drain axis and another position extending perpendicular to the drain axis.

Optionally, in one embodiment, the water permeable valve or valve structure is electrically powered. In this way, when it is desired to close or open the valve, sufficient power can be provided to move the valve member, particularly when the tunnel displacement is large, creating a large resistance.

Optionally, in one embodiment, an emergency valve is provided between the permeate valve and the permeate well. Therefore, when the seepage valve fails, the emergency valve can be closed to avoid pollution drainage water flowing into the seepage well through the failed seepage valve to cause groundwater pollution.

Preferably, in any embodiment, a cover plate is arranged at the wellhead of the percolating well. Thus, personnel, animals or other foreign matters can be prevented from falling into the infiltration well.

Optionally, in one embodiment, the deck comprises a C35 reinforced concrete deck.

Optionally, in one embodiment, an insulation layer (e.g., polyurethane insulation layer) is included in the cover plate.

Preferably, in any embodiment, a filtering structure is arranged at the upper part in the infiltration well, and the filtering structure comprises from top to bottom: an upper pebble silt-preventing filter layer; upper geotextile (capable of preventing sand leakage); a middle coarse sand and sediment filter layer; lower geotextile (capable of preventing sand leakage); a lower layer of broken stone sediment-proof filter layer; and a pallet. Thus, the filter is carried out step by step from top to bottom so as to prevent broken stone sediment from blocking the seepage well.

Optionally, in one embodiment, the pallet comprises a C35 reinforced concrete pallet.

Optionally, in one embodiment, the plurality of water permeable holes in the tray are evenly distributed.

Optionally, in one embodiment, the plurality of water permeable holes in the tray are distributed in a rectangular grid array.

Optionally, in one embodiment, the plurality of water permeable holes in the tray are distributed in a quincunx array.

Preferably, in any embodiment, the support plate is provided with a plurality of water permeable holes, and the hole diameter is below 0.5cm. Alternatively, in one embodiment, the pore size is 0.1-0.5cm.

Preferably, in any embodiment, the water permeable hole opening rate in the supporting plate is not less than 15%. Optionally, in one embodiment, the water permeable aperture ratio is 15% -30%.

Optionally, in one embodiment, the wall of the seepage well includes, from inside to outside in a radial direction: the filter screen is arranged on the bottom of the filter tank. Thus, through the three-layer structure of the well wall, water in the well can quickly penetrate into the external stratum, and external sediment and pollutants are prevented from penetrating into the well. Wherein the reverse osmosis structure can prevent impurities or pollutants outside the infiltration well from infiltrating into the infiltration well, and can be formed by filling gravel outside the filter screen.

Alternatively, in one embodiment, the water permeable structure may comprise: permeable concrete filter/seepage pipe. Wherein, the filter tube is provided with a filter screen, which can filter impurities and pollutants.

Optionally, in one embodiment, the water permeable structure comprises: the inner diameter of the filter tube/water seepage tube is 1m.

Alternatively, in one embodiment, the water permeable structure comprises MU10 bricks formed by M7.5 cement mortar.

Alternatively, in one embodiment, the filter screen comprises a 400 mesh filter screen.

Optionally, in one embodiment, the filter mesh comprises a nylon mesh or an iron mesh.

Alternatively, in one embodiment, the water seepage amount of the seepage well can be calculated as follows:

wherein R is the influence radius, R is the radius of the seepage well, H is the water level elevation in the seepage well, H is the groundwater level elevation, and K is the permeability coefficient of the stratum.

Thus, according to the design requirement of seepage, the structural parameters of the seepage well, such as the radius of the seepage well, and the like, can be calculated.

Fig. 1 is a top view of an osmotic well system according to an embodiment of the present invention. Fig. 2 is a schematic structural view of an osmotic well system according to an embodiment of the present invention.

In the embodiments shown in fig. 1 and 2, a percolating well system is visible for tunnel outlet drainage (to a drain pipe along a horizontal right arrow in fig. 1), comprising:

a drain pipe 100 connected to a tunnel outlet;

a drain detector 200 disposed in the drain pipe;

a sewage treatment system 300 connected to the drain pipe via a sewage valve;

a percolating well 700 connected to the drain pipe via a percolating valve;

wherein when the blowdown detector detects that the quality of the drain water in the drain pipe is acceptable, the sewage valve is closed and the water seepage valve is opened to allow drain water to flow (illustrated as rightward flow in fig. 1) to the water seepage well; when the blowdown detector detects that the quality of the drain water in the drain pipe is unacceptable, the water penetration valve is closed and the sewage valve is opened to allow drain water flow (illustrated as upward flow in fig. 1) to the sewage treatment system.

In the embodiment shown in fig. 1, the sewage valve and the water infiltration valve are integrated into a valve structure 500, which comprises: a valve member (illustrated in fig. 1 as a valve plate 550) pivotable between a first position (e.g., extending the valve plate 550 horizontally in fig. 1) to close the waste water valve and open the permeate valve to allow drainage flow (illustrated to the right in fig. 1) to the permeate well 700, and a second position (e.g., extending the valve plate 550 vertically in fig. 1) to close the permeate valve and open the waste water valve to allow drainage flow (illustrated to the up in fig. 1) to the waste water treatment system 300.

In the embodiment shown in fig. 1, a water seepage stop structure 560 is provided at the wellhead of the percolating well, against which stop structure 560 the percolating valve (e.g. the valve plate 550) can stop when closed (e.g. with the valve plate 550 extending vertically in fig. 1). Therefore, through cooperation of the seepage valve and the seepage stop structure, seepage caused by excessive deflection of the seepage valve can be prevented, and the waterproof effect of the seepage valve is effectively improved.

It is noted that relational terms such as first and second, and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the statement "comprises one" does not exclude that an additional identical element is present in a process, method, article or apparatus that comprises the element.

In the description of elements herein, a plurality of juxtaposed features connected by "and/or" is meant to encompass one or more (or one or more) of these juxtaposed features. For example, the meaning of "a first element and/or a second element" is: one or more of the first element and the second element, i.e., only the first element, or only the second element, or both the first element and the second element (both present).

The various embodiments provided in this invention may be combined with each other as desired, e.g., features of any two, three or more embodiments may be combined with each other to form new embodiments of the invention, which are also within the scope of the invention unless stated otherwise or contradicted by skill.

The foregoing description of the exemplary embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any modifications, equivalents, and variations which fall within the spirit and scope of the invention are intended to be included in the scope of the invention.

Claims

1. An percolating well system for tunnel exit drainage, comprising:

a drain pipe connected to the tunnel outlet;

a drain detector disposed within the drain pipe;

a sewage treatment system connected to the drain pipe via a sewage valve;

a percolating well connected to the drain pipe via a percolating valve;

2. The percolating well system of claim 1, wherein,

the drain pipe is coated with an insulating layer.

3. The percolating well system of claim 1, wherein,

and an insulation structure is arranged at the inlet of the seepage well.

4. The percolating well system of claim 1, wherein,

the blowdown detector comprises a PH monitor.

5. The percolating well system of claim 4, wherein,

when the PH monitor detects that the PH value of the drainage water in the drainage pipe is 6-10, the quality of the drainage water is qualified.

6. An osmotic well system according to any one of claims 1 to 5, wherein,

and a cover plate is arranged at the wellhead of the seepage well.

7. An osmotic well system according to any one of claims 1 to 5, wherein,

the upper part in the infiltration well sets up filtration, and it includes from the top down: an upper pebble silt-preventing filter layer; an upper geotextile layer; a middle coarse sand and sediment filter layer; a lower geotextile layer; a lower layer of broken stone sediment-proof filter layer; and a supporting plate.

8. The percolating well system of claim 7, wherein,

a plurality of conical water permeable holes are formed in the supporting plate.

9. The percolating well system of claim 7, wherein,

a plurality of water permeable holes are formed in the supporting plate, and the aperture is below 0.5cm.

10. The percolating well system of claim 7, wherein,

the aperture ratio of the water permeable holes in the supporting plate is not less than 15 percent.