A tunnel groundwater recycling device based on ecological water demand dynamic regulation

Abstract

This invention relates to a tunnel groundwater recycling device based on dynamic regulation of ecological water demand, belonging to the field of tunnel groundwater. It includes a circumferential drainage pipe located between the initial support and secondary lining. Multiple circumferential drainage pipes are distributed at certain intervals along the longitudinal direction of the tunnel, and adjacent circumferential drainage pipes are connected by longitudinal water guide pipes. Each circumferential drainage pipe has transverse outlet pipes connected to both sides of its bottom. The key feature is that the transverse outlet pipes are connected to corresponding water storage and reinjection devices, and electric water valves are installed on the transverse outlet pipes, which are connected to a terminal controller. This device can effectively recycle groundwater while balancing ecological water demand and tunnel safety. During rainy seasons, the discharged water is stored, and when rainfall is insufficient, the stored water is reinjected into the ecological environment. The reinjection volume is precisely controlled, further reducing the tunnel's damage to the ecological environment and protecting tunnel safety.

Description

Technical Field

[0001] This invention relates to the field of tunnel groundwater technology, specifically to a tunnel groundwater recycling device based on dynamic regulation of ecological water demand. Background Technology

[0002] With the deepening development of the concept of limited drainage, more and more tunnels are adopting limited drainage to treat groundwater. Although this concept can protect the environment to a certain extent, excessive discharge of groundwater will damage the ecological environment to some extent and there is also the problem of how to deal with the discharged groundwater, which wastes water resources. Summary of the Invention

[0003] The purpose of this invention is to provide a tunnel groundwater recycling device based on dynamic regulation of ecological water demand, which can effectively realize the recycling of groundwater while taking into account both ecological water demand and tunnel safety, thereby maximizing the protection of the ecological environment and reducing the waste of water resources.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows: a tunnel groundwater recycling device based on dynamic regulation of ecological water demand, comprising a circumferential drainage pipe located between the initial support and the secondary lining. Multiple circumferential drainage pipes are distributed at certain intervals along the longitudinal direction of the tunnel. Adjacent circumferential drainage pipes are connected by longitudinal water guide pipes. Each circumferential drainage pipe has transverse water outlet pipes connected to both sides of its bottom. The transverse water outlet pipes are connected to corresponding water storage and recharge devices. An electric water valve is provided on the transverse water outlet pipe, and the electric water valve is connected to a terminal controller.

[0005] Furthermore, a sediment filter is installed on the horizontal outlet pipe, and the sediment filter contains...

[0006] It features a removable filter element for filtering coarse particles of silt and sand.

[0007] Furthermore, the water storage and reinjection device includes a water storage chamber, multiple reinjection shafts, and a reinjection booster pump. The multiple reinjection shafts are located between the water storage chambers and are connected to the water storage chambers through connecting pipes. The reinjection booster pump and electric water valve are installed on the connecting pipes and are connected to a terminal controller.

[0008] Furthermore, the horizontal outlet pipe located in the water storage chamber is equipped with a detachable filter nozzle at its end for secondary filtration of fine particles of silt and sand.

[0009] Furthermore, each reinjection shaft includes a shaft body and a stainless steel pipe. The shaft body is located at the bottom of the tunnel invert and has a stainless steel pipe inside. Several water outlet holes are opened on the lower part of the side wall of the stainless steel pipe. The stainless steel pipe passes through the secondary lining and the initial support in sequence to the surrounding rock. The stainless steel pipe located in the surrounding rock has a clay layer and a sand filling layer arranged from top to bottom on the outside of the stainless steel pipe. The water outlet holes are located in the sand filling layer.

[0010] Furthermore, the number of multiple reinjection shafts is obtained according to the following formula:

[0011]

[0012] In the formula This refers to the number of reinjection shafts; The maximum water storage capacity of a single water storage chamber; This refers to the amount of water recharged into a single recharge shaft.

[0013] Furthermore, the water storage chambers are located at the bottom arch of the tunnel and are symmetrically arranged. Each water storage chamber is equipped with a removable filter screen for filtering impurities. The end of the horizontal water outlet pipe is located above the filter screen. Each water storage chamber is equipped with a fixed manhole cover on top.

[0014] Furthermore, water pressure monitoring sensors are installed on both the outer side of the initial support and the outer side of the secondary lining to monitor changes in water pressure; flow monitoring sensors are installed on both the transverse outlet pipe and the connecting pipe to monitor drainage and recharge volumes, respectively; and both the water pressure monitoring sensors and the flow monitoring sensors are connected to the terminal controller.

[0015] Furthermore, the method for obtaining the reinjection volume is as follows:

[0016]

[0017] In the formula The total groundwater recharge is calculated using the formula... ; This is the rainfall infiltration coefficient; This refers to the local rainfall. This refers to the amount of water recharged. This refers to the amount of groundwater drained from the tunnel. The aquifer's hydraulic conductivity; Radius of influence for tunnel drainage; This represents the initial height of the aquifer. This refers to the groundwater head height.

[0018] As a further step, the method for dynamic regulation of ecological water demand based on the aforementioned tunnel groundwater recycling device is as follows: A water pressure monitoring sensor monitors the external water pressure in the tunnel in real time and transmits this pressure information to a terminal controller. When the pressure exceeds a set stable water pressure value, the terminal controller controls the electric water valve on the transverse outlet pipe to open. At this time, a flow monitoring sensor on the transverse outlet pipe monitors the drainage volume in real time. Water flows through the longitudinal guide pipe, the circumferential drainage pipe, and the transverse outlet pipe, and after multiple filtrations, into the water storage chamber. When the external water pressure monitored by the water pressure monitoring sensor in real time equals the set stable water pressure value, the terminal controller controls the electric water valve to close and records the tunnel groundwater drainage volume monitored in real time by the flow monitoring sensor on the transverse outlet pipe. To achieve the purpose of tunnel drainage and water storage; the total groundwater recharge > At that time, no reinjection will be carried out; when the total groundwater recharge is... < At this time, the electric water valve on the horizontal outlet pipe closes, and the terminal controller controls the reinjection booster pump to open. When the pressure of the reinjection booster pump reaches a certain value, the terminal controller will open the electric water valve on the connecting pipe to reinject the groundwater stored during the rainy season into the ecological environment. The flow monitoring sensor on the connecting pipe monitors the reinjection volume in real time. When the reinjection volume received by the terminal controller reaches a certain value... At this time, the terminal controller shuts off the reinjection booster pump and the electric water valve on the connecting pipeline to achieve the purpose of reinjection.

[0019] Compared with the prior art, the above technical solution adopted in this invention has the following advantages: This device can effectively realize the recycling of groundwater while taking into account both ecological water demand and tunnel safety. During the rainy season, the discharged water is stored, and when there is a lack of rainfall, the stored water is reinjected into the ecological environment. The reinjection volume is highly precise, which can further reduce the damage of the tunnel to the ecological environment and protect the tunnel safety. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the longitudinal section of the tunnel groundwater recycling device;

[0021] Figure 2 This is a 3D diagram of the pipeline distribution within the tunnel lining structure.

[0022] Figure 3 This is a side view of the tunnel's groundwater recycling device;

[0023] Figure 4 This is a schematic diagram showing the installation location of the water pressure monitoring sensor.

[0024] In the diagram: 1-Initial support; 2-Secondary lining; 3-Circular drainage pipe; 4-Longitudinal water guide pipe; 5-Transverse water outlet pipe; 6-Sediment filter; 7-Filter element; 8-Electric water valve; 9-Flow monitoring sensor; 10-Recharge booster pump; 11-Filter nozzle; 12-Filter screen; 13-Water storage chamber; 14-Recharge shaft; 15-Terminal controller; 16-Fixable well cover; 17-Electric water valve; 18-Flow monitoring sensor; 19-Surrounding rock; 20-Water outlet; 21-Water pressure monitoring sensor; 22-Stainless steel pipe; 23-Shaft; 24-Clay layer; 25-Sand filling layer. Detailed Implementation

[0025] The technical solution of the present invention will be described below with reference to the accompanying drawings. It should be understood that the detailed embodiments and specific operation processes described herein are only for illustration and explanation of the present invention and are not intended to limit the present invention.

[0026] Example 1

[0027] The technical solution of this invention is mainly a tunnel groundwater recycling device based on dynamic regulation of ecological water demand, including a longitudinal water guide pipe, a circumferential drainage pipe, a transverse water outlet pipe, a water storage and recharge device, a water pressure monitoring sensor, a flow monitoring sensor, an electric water valve, and a terminal controller.

[0028] In this embodiment, the circumferential drainage pipes are distributed at intervals of 1 to 10 meters along the longitudinal direction of the tunnel and are connected to the longitudinal water guide pipes and the transverse water outlet pipes at the arch foot position; the transverse water outlet pipes are equipped with a silt filter, and a removable filter element is installed inside the silt filter to filter coarse silt; an electric water valve is installed at the front end of the silt filter.

[0029] In this embodiment, the water storage and reinjection device includes a water storage chamber, multiple reinjection shafts, a filter screen, and a reinjection booster pump. The water storage chamber is located at the bottom arch of the tunnel and is symmetrically distributed on both sides of the tunnel. It has a fixed manhole cover on top and is connected to the transverse water outlet pipe. The water storage chamber serves to store water. The end of the transverse water outlet pipe is located in the water storage chamber and is equipped with a detachable filter nozzle. The filter nozzle can be made of steel wire or adjusted according to the actual situation for secondary filtration of fine particles of mud and sand.

[0030] In this embodiment, multiple reinjection shafts are located between two water storage chambers and connected to the water storage chambers via connecting pipes, which can be made of stainless steel. Each reinjection shaft includes a shaft body and a stainless steel pipe. The shaft body is located at the bottom of the tunnel invert and contains the stainless steel pipe. Several water outlets are provided on the lower part of the sidewall of the stainless steel pipe to reasonably divert water, effectively reduce soil erosion at the bottom of the shaft, and ensure tunnel safety. The stainless steel pipe passes downward through the secondary lining and initial support of the tunnel to the surrounding rock. The outer side of the stainless steel pipe inside the surrounding rock is provided with a clay layer and a sand filling layer from top to bottom. The water outlets are located in the sand filling layer to ensure that groundwater can be reinjected into the ecological environment efficiently. Alternatively, it can be changed to other highly permeable soil layers according to the actual situation. The number of multiple reinjection shafts is obtained according to the following formula:

[0031]

[0032] In the formula This refers to the number of reinjection shafts; The maximum water storage capacity of a single water storage chamber; This represents the recharge volume of a single recharge shaft. This formula effectively determines the number of recharge shafts, ensuring a sufficient number to meet the recharge needs and guaranteeing the safety and effectiveness of the recharge process.

[0033] In this embodiment, the filter screen is located in the water storage chamber and is detachable. It filters impurities or other impurities that are not part of the original groundwater and are generated during the exposure of groundwater to air.

[0034] In this embodiment, the reinjection booster pump is located on the connecting pipeline between the water storage chamber and multiple reinjection shafts; the reinjection booster pump is connected to the terminal controller, and the pressure is controlled in real time by the terminal controller.

[0035] In this embodiment, water pressure monitoring sensors are located on the outer side of the initial support and the outer side of the secondary lining, respectively, to monitor changes in water pressure; flow monitoring sensors are located on the front end of the electric water valve on the transverse outlet pipe and on the connecting pipe between the water storage chamber and multiple reinjection shafts, respectively, to monitor drainage and reinjection volume; both water pressure and flow monitoring sensors are connected to the terminal controller. The reinjection volume is obtained as follows:

[0036]

[0037] In the formula The total groundwater recharge is calculated using the formula... ; This is the rainfall infiltration coefficient, which can be obtained based on local geological conditions or survey data; This represents the local rainfall amount, which can be determined based on historical or real-time rainfall data. This refers to the amount of water recharged. This refers to the amount of groundwater drained from the tunnel. Based on local geological data and the aquifer's hydraulic conductivity obtained through surveying; The radius of influence of tunnel drainage is obtained from the Theis formula; This represents the initial height of the aquifer.

[0038] The groundwater head height was designed based on local annual ecological water demand data and lining safety.

[0039] Example 2

[0040] A method for dynamically regulating ecological water demand based on the tunnel groundwater recycling device described in Embodiment 1 is as follows: a water pressure monitoring sensor monitors the external water pressure of the tunnel in real time and transmits this pressure information to the terminal controller. When the pressure of any water pressure monitoring sensor exceeds the stable water pressure value (groundwater head height), (Based on the calculated stable water pressure value), the terminal controller opens the electric water valve and simultaneously monitors the drainage volume in real time via a flow monitoring sensor. Water flows through the longitudinal guide pipe, circumferential drainage pipe, and transverse outlet pipe, passing through multiple filters before reaching the storage chamber. When the external water pressure outside the tunnel, as monitored in real time by the water pressure monitoring sensor, equals the set stable water pressure value, the terminal controller closes the electric water valve and records the tunnel groundwater drainage volume monitored in real time by the flow monitoring sensor. To achieve the purpose of tunnel drainage and water storage; when > When, no recharge is performed; when < At that time, considering the ecological water demand, the tunnel will not be drained, the electric water valve of the horizontal outlet pipe will be closed, the terminal controller will start the reinjection booster pump, and the reinjection booster pump will transmit the pressure value information to the terminal controller in real time. At the same time, the terminal controller will receive the reinjection volume. Once the pressure of the reinjection booster pump reaches a certain value, the terminal controller opens the electric water valve on the connecting pipeline, reinjecting the groundwater stored during the rainy season into the ecological environment. A flow monitoring sensor monitors the reinjection volume in real time. When the reinjection volume received by the terminal controller reaches... At that time, the terminal controller shuts off the reinjection booster pump and the electric water valve on the connecting pipeline to achieve the purpose of reinjection.

Claims

1. A tunnel groundwater recycling device based on dynamic regulation of ecological water demand, comprising a circumferential drainage pipe located between the initial support and the secondary lining, wherein multiple circumferential drainage pipes are distributed at certain intervals along the longitudinal direction of the tunnel, adjacent circumferential drainage pipes are connected by longitudinal water guide pipes, and each circumferential drainage pipe has transverse outlet pipes connected to both sides of its bottom, characterized in that... The horizontal water outlet pipe is connected to the corresponding water storage and reinjection device. An electric water valve is installed on the horizontal water outlet pipe, and the electric water valve is connected to the terminal controller. The water storage and reinjection device includes a water storage chamber, multiple reinjection shafts and a reinjection booster pump. The multiple reinjection shafts are located between the water storage chambers and are connected to the water storage chambers through connecting pipes. The reinjection booster pump and electric water valve are installed on the connecting pipes and are connected to a terminal controller. Water pressure monitoring sensors are installed on the outer side of the initial support and the outer side of the secondary lining to monitor changes in water pressure; flow monitoring sensors are installed on the transverse outlet pipe and the connecting pipe to monitor drainage and recharge volume, respectively; the water pressure monitoring sensors and flow monitoring sensors are all connected to the terminal controller. The method for obtaining the reinjection volume is as follows: In the formula The total groundwater recharge is calculated according to the formula. ; The infiltration coefficient of rainfall. This refers to the local rainfall. This refers to the amount of water recharged. This refers to the amount of groundwater drained from the tunnel. The aquifer's hydraulic conductivity; Radius of influence for tunnel drainage; This represents the initial height of the aquifer. This refers to the groundwater head height. The dynamic regulation of ecological water demand is as follows: Water pressure monitoring sensors monitor the external water pressure of the tunnel in real time and transmit the pressure information to the terminal controller. When the pressure exceeds the set stable water pressure value, the terminal controller controls the electric water valve on the transverse outlet pipe to open. At this time, the flow monitoring sensor on the transverse outlet pipe monitors the drainage volume in real time. Water flows through the longitudinal guide pipe, the circumferential drainage pipe, and the transverse outlet pipe, and after multiple filtrations, into the water storage chamber. When the external water pressure monitored by the water pressure monitoring sensors equals the set stable water pressure value, the terminal controller controls the electric water valve to close and records the tunnel groundwater drainage volume monitored by the flow monitoring sensor on the transverse outlet pipe. This is to achieve the purpose of tunnel drainage and water storage; When the total groundwater recharge > At that time, no reinjection will be carried out; when the total groundwater recharge is... < At this time, the electric water valve on the horizontal outlet pipe closes, and the terminal controller controls the reinjection booster pump to open. When the pressure of the reinjection booster pump reaches a certain value, the terminal controller will open the electric water valve on the connecting pipe to reinject the groundwater stored during the rainy season into the ecological environment. The flow monitoring sensor on the connecting pipe monitors the reinjection volume in real time. When the reinjection volume received by the terminal controller reaches a certain value... At this time, the terminal controller shuts off the reinjection booster pump and the electric water valve on the connecting pipeline to achieve the purpose of reinjection.

2. The tunnel groundwater recycling device based on dynamic regulation of ecological water demand according to claim 1, characterized in that, A sediment filter is installed on the horizontal outlet pipe, and a removable filter element is installed inside the sediment filter to filter out coarse sediment particles.

3. The tunnel groundwater recycling device based on ecological water demand dynamic regulation according to claim 1, characterized in that, The horizontal outlet pipe located in the water storage chamber is equipped with a detachable filter nozzle at its end for secondary filtration of fine particles of mud and sand.

4. The tunnel groundwater recycling device based on ecological water demand dynamic regulation according to claim 1, characterized in that, Each reinjection shaft includes a shaft body and a stainless steel pipe. The shaft body is located at the bottom of the tunnel invert and has a stainless steel pipe inside. Several water outlet holes are opened on the lower part of the side wall of the stainless steel pipe. The stainless steel pipe passes through the secondary lining and the initial support in sequence to the surrounding rock. The stainless steel pipe located in the surrounding rock has a clay layer and a sand filling layer from top to bottom on the outside of the stainless steel pipe. The water outlet holes are located in the sand filling layer.

5. The tunnel groundwater recycling device based on ecological water demand dynamic regulation according to claim 1, characterized in that, The number of multiple reinjection shafts is obtained according to the following formula: wherein is the number of recharge shafts; is the maximum water storage of a single water storage chamber; is the recharge water volume of a single recharge shaft.

6. The tunnel groundwater recycling device based on ecological water demand dynamic regulation according to claim 1, characterized in that, The water storage chambers are located at the bottom arch of the tunnel and are symmetrically arranged. Each water storage chamber is equipped with a removable filter screen for filtering impurities. The end of the horizontal water outlet pipe is located above the filter screen. Each water storage chamber is equipped with a fixed manhole cover on top.

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