Multifunctional ecological water supply tunnel structure for ultra-high rockfill dam

Abstract

The present invention discloses a multifunctional ecological water supply tunnel structure and operation method for a super high rockfill dam, and belongs to the field of water conservancy and hydropower engineering. The multifunctional ecological water supply tunnel structure for a super high rockfill dam described in the present invention can form different structures in different operation stages, thereby realizing different functional roles, and the structural arrangement is simple to realize, and the construction is convenient, and it realizes the functions of ecological water supply, water storage and discharge control, diversion during the maintenance period, and diversion and flood control during the flood season, thereby achieving the purpose of one tunnel for multiple uses, and meeting the multiple needs of the super high core wall rockfill dam project, so that when having the corresponding functions, other corresponding functional tunnels required for the super high core wall rockfill dam project can be reduced, the engineering volume can be reduced, and the engineering investment can be saved.

Description

Technical Field

[0001] The invention relates to the field of water conservancy and hydropower engineering, and in particular to a multifunctional ecological water supply tunnel structure and an operation method, which are particularly suitable for ultra-high rockfill dam projects. Background Art

[0002] At present, many 300m-class extra-high rockfill dam hydropower projects are being built and planned in southwest my country, such as Shuangjiangkou 312m, Lianghekou 295m, Rumei 315m, etc. These extra-high rockfill dams are located in high mountain canyons, with steep slopes on both sides of the riverbed. The construction diversion adopts the tunnel diversion scheme of digging corresponding diversion tunnels in the mountain, so that the upstream river channel is diverted to flow into the downstream river channel through the diversion tunnel; the diversion tunnel generally includes the initial diversion tunnel and the later diversion tunnel.

[0003] With the continuous improvement of environmental protection requirements for water conservancy and hydropower projects, the issue of ecological flow discharged from reservoir projects has become a focus of attention for environmental protection authorities. At present, there are many solutions for discharging ecological flow during the water storage period and operation of water conservancy and hydropower projects, such as the conventional treatment methods: a. Bury a water discharge steel pipe under the bottom plate of the diversion tunnel; b. Control the gate opening by partially opening the inlet steel gate in the diversion and discharge structure; c. Build a bypass tunnel on the inlet side of the diversion tunnel, etc. The common feature of these solutions is to use the diversion tunnel as a flow channel to discharge the ecological flow required for environmental protection, effectively meeting the downstream ecological water demand.

[0004] However, the ultra-high rockfill dam is large in scale, has a long construction period, and has diversion tunnels arranged in layers with large height differences. It is difficult and risky to close the gates and store water in the reservoir, which involves many complex factors. It is often necessary to set up a special ecological water supply tunnel. However, traditional ecological water supply tunnels usually only have ecological water supply functions and cannot play other functional roles. This leads to the need to build other functional tunnels in ultra-high rockfill dam projects to meet engineering needs.

[0005] A. Maintenance function of initial diversion tunnel: The construction process of ultra-high rockfill dam is affected by many factors, the construction period is very long, and there is great uncertainty. The initial diversion tunnel often exceeds the service life in the project. When there is a lot of river bedload, such as construction waste slag in the upstream during the construction period, the bedload, driven by high-speed water flow, wears the concrete bottom plate of the initial diversion tunnel year after year. Under the combined action of cavitation and bedload, it is very easy to cause erosion and damage to the bottom plate structure of the initial diversion tunnel chamber and the initial diversion tunnel body, which brings great safety hazards to the initial diversion tunnel. Once a problem occurs, it is not only difficult to deal with, but also easy to delay the power generation period of the power station, resulting in huge economic and social benefits. Therefore, before the initial diversion tunnel of the ultra-high rockfill dam is closed and blocked, the gate chamber and the initial diversion tunnel body structure must be thoroughly and comprehensively inspected; accordingly, a special inspection tunnel for use during the maintenance of the initial diversion tunnel is usually built.

[0006] B. The flood diversion and flood control role during the initial diversion tunnel operation period: In recent years, the hydropower station dam site area has experienced frequent heavy rains and extreme floods, which have brought great safety hazards to the high dam construction. For example, the continuous rainfall in the area where the Shuangjiangkou Hydropower Station is located has exceeded 25 mm in the past 24 hours, and the maximum flow of the No. 1 diversion tunnel has reached 3710 cubic meters per second, which has refreshed the maximum peak record of the dam site since the survey and design work of the project. However, due to the high water level during the construction and flood control, the tunnel body is in a pressurized flow state, which will cause certain erosion damage to the gate chamber in the ecological water supply tunnel. The traditional ecological water supply tunnel gate chamber cannot withstand the impact of water flow during the flood season, making the ecological water supply tunnel unable to participate in flood control and diversion during the flood season.

[0007] In addition, traditional ecological water supply tunnels often do not control and regulate the ecological water supply flow. For ultra-high rockfill dams, the water level rise rate needs to be controlled during the water storage period to ensure the safety of the rockfill dam body. Therefore, in addition to having the ecological water supply function, the ecological water supply tunnel also needs to be able to regulate the water level rise rate.

[0008] In summary, the traditional ecological water supply tunnel cannot meet the multifunctional needs of the ultra-high rockfill dam. Therefore, it is of great significance for the construction of ultra-high rockfill dam projects to expand the functions of the ecological water supply tunnel so that it can be used for flood diversion, initial diversion tunnel maintenance, and controllable ecological flow discharge during the entire operation period. Summary of the invention

[0009] The technical problem solved by the present invention is to provide a new multifunctional ecological water supply tunnel structure for ultra-high rockfill dams to meet the needs of ultra-high rockfill dam engineering construction.

[0010] The technical solution adopted by the present invention to solve its technical problems is: a multifunctional ecological water supply tunnel structure for an ultra-high rockfill dam includes an ecological tunnel body, which is respectively connected to the upstream river channel and the downstream river channel of the rockfill dam body, a vertical shaft lock chamber is provided in the middle of the ecological tunnel body, a flat gate is provided in the vertical shaft lock chamber, and a bank tower lock chamber is provided at the outlet of the ecological tunnel body, and the orifice of the bank tower lock chamber is correspondingly connected to the outlet of the ecological tunnel body.

[0011] Furthermore, a shore tower gate is arranged in the shore tower gate chamber, and the shore tower gate is a curved gate.

[0012] Furthermore, an outlet open channel section is provided at the outlet of the ecological cave body immediately downstream, a bank tower lock chamber bottom plate is provided at the bottom upstream of the outlet open channel section, and the bank tower lock chamber is arranged on the bank tower lock chamber bottom plate.

[0013] Furthermore, the inlet floor elevation of the ecological tunnel body is consistent with the inlet floor elevation of the initial diversion tunnel.

[0014] Furthermore, the cross-sectional shape of the ecological cave is a city gate cave type.

[0015] Furthermore, the diameter of the ecological tunnel body is the larger value of the tunnel diameters required to meet the requirements of the maintenance flow during the initial diversion tunnel maintenance process and the requirements of the ecological water supply flow during the water storage period.

[0016] The present invention also provides an operation method of a multifunctional ecological water supply tunnel structure for an ultra-high rockfill dam, the multifunctional ecological water supply tunnel structure for an ultra-high rockfill dam comprises an ecological tunnel body, the ecological tunnel body is respectively connected to an upstream river channel and a downstream river channel of the rockfill dam body, a vertical shaft lock chamber is arranged in the middle of the ecological tunnel body, and a flat gate is arranged in the vertical shaft lock chamber, the operation method comprises the following steps:

[0017] The first step is to open the gates in the initial diversion tunnel and the flat gates in the ecological tunnel during the flood season when the initial diversion tunnel is in operation, so that the upstream water can flow through the ecological tunnel and the initial diversion tunnel;

[0018] Step 2: During the initial diversion tunnel maintenance period, open the flat gate inside the ecological tunnel to allow upstream water to flow through the ecological tunnel;

[0019] Step 3: After the inspection and construction of the initial diversion tunnel is completed, the gate in the initial diversion tunnel is opened to allow the upstream water to flow through the initial diversion tunnel. Then, the flat gate is lowered to block the body of the ecological tunnel. Then, a bank tower lock chamber is built at the outlet of the ecological tunnel. A bank tower gate is installed in the bank tower lock chamber. The orifice of the bank tower lock chamber is connected to the outlet of the ecological tunnel body.

[0020] Step 4: The construction of the bank tower lock chamber is completed and ready for operation;

[0021] Step 5: During the initial diversion tunnel water storage period, after the gate in the initial diversion tunnel, the flat gate and the shore tower gate are opened synchronously to release ecological water supply to the downstream through the ecological tunnel;

[0022] Step 6. After the water level rises to the target level, lower the flat gate to seal the ecological cave body, and then carry out the construction of permanent plug inside the ecological cave body.

[0023] Furthermore, the bank tower gate is a radial gate; in the fifth step, the radial gate is used to adjust the downward flow in the ecological cave body while meeting the requirements of the downward ecological water supply flow and the water level rising speed.

[0024] Furthermore, the inspection and maintenance work of the initial diversion tunnel is scheduled to be carried out during the nearest dry season before the initial diversion tunnel is closed to store water.

[0025] The beneficial effects of the present invention are:

[0026] 1. The multifunctional ecological water supply tunnel structure for the ultra-high rockfill dam of the present invention can form different structures in different operation stages, thereby realizing different functional roles. The structural layout is simple to realize and the construction is convenient. At the same time, it has the functions of ecological water supply, water storage and discharge control, diversion during the maintenance period, and diversion and flood control during the flood season, achieving the purpose of one tunnel for multiple uses and meeting the multiple needs of the ultra-high rockfill dam project. Therefore, under the condition of having corresponding functions, other corresponding functional tunnels required for the ultra-high rockfill dam project can be reduced, thereby reducing the engineering workload and saving engineering investment.

[0027] 2. The present invention arranges a flat gate in the body of the ecological tunnel. The flat gate is opened during the flood season in the initial operation period of the diversion tunnel, and can be closed during the dry season in the same period. This can effectively reduce the scouring and damage of the ecological tunnel body by the bedload, and can save the use of erosion-resistant and wear-resistant concrete materials, thereby achieving the purpose of reducing project investment and simplifying construction. In addition, the present invention makes full use of the flat gate to block water, and has higher reliability and erosion resistance than the arc gate. During the construction of the shore tower lock chamber in the later stage, dry land construction conditions can be formed at the tunnel body outlet. In addition, during the construction period of the permanent plug in the ecological tunnel body, dry land construction conditions can also be effectively formed.

[0028] 3. During the flood season in the initial diversion tunnel operation period, the multifunctional ecological water supply tunnel structure for the ultra-high rockfill dam of the present invention can open the flat gate to conduct flood diversion, so that the ecological water supply tunnel has the function of flood diversion.

[0029] 4. The present invention can arrange for the shore tower lock chamber to be completed after the initial diversion tunnel is overhauled and before the initial diversion tunnel is closed, so as to avoid the problem of high water head of the ecological diversion tunnel during the flood season to erode and damage the arc gate structure, so that the ecological tunnel body can be used for flood season in the early stage. At the same time, the shore tower lock chamber is set at the exit position of the ecological tunnel body, which can reduce the scale of the ecological water supply tunnel structure to a certain extent, so as to reduce the project investment and simplify the construction.

[0030] 5. During the initial diversion tunnel maintenance process, the ecological water supply tunnel structure can open the flat gate to achieve the diversion function during the maintenance period and provide working conditions for the initial diversion tunnel maintenance. Therefore, it can have maintenance functions without the need to set up a special maintenance tunnel, which can reduce project investment.

[0031] 6. The bank tower gate of the present invention preferably adopts an arc gate, and the discharge flow is controlled by the arc gate, which can meet the requirements of rising water level and ecological flow required for environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a plan view of the ecological water supply tunnel structure used for the ultra-high rockfill dam according to the present invention.

[0033] Figure 2 This is a longitudinal section of the ecological cave.

[0034] Figure 3 This is a partial schematic diagram of the area near the exit of the ecological cave corresponding to the previous structure.

[0035] Figure 4 This is a partial schematic diagram of the area near the exit of the ecological cave corresponding to the later structure.

[0036] Marked in the figure are: ecological tunnel body 1, rockfill dam body 2, vertical shaft lock chamber 3, flat plate gate 4, bank tower lock chamber 5, initial diversion tunnel 6, later diversion tunnel 7, bank tower gate 8, outlet open channel section 9, bank tower lock chamber bottom plate 10, and permanent plug 11. DETAILED DESCRIPTION

[0037] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0038] like Figures 1 to 4 As shown, the multifunctional ecological water supply tunnel structure for the ultra-high rockfill dam of the present invention comprises an ecological tunnel body 1, which is connected to the upstream river channel and the downstream river channel of the rockfill dam body 2 respectively. A vertical shaft lock chamber 3 is provided in the middle of the ecological tunnel body 1, and a flat gate 4 is provided in the vertical shaft lock chamber 3. A bank tower lock chamber 5 is provided at the outlet of the ecological tunnel body 1, and the orifice of the bank tower lock chamber 5 is correspondingly connected to the outlet of the ecological tunnel body 1.

[0039] The multifunctional ecological water supply tunnel structure for the ultra-high rockfill dam of the present invention is a later structure corresponding to the later stage of its entire operation process, specifically, it is a structure corresponding to the completion of the shore tower gate chamber 5 before the initial diversion tunnel 6 is closed and plugged for water storage. During the subsequent closing and plugging of water storage, the ecological flow can be released downstream through the above-mentioned later structure. Without loss of generality, the shore tower gate chamber 5 is built to control the release of the ecological flow through the shore tower gate 8 in the shore tower gate chamber 5, so it is necessary to set a corresponding shore tower gate 8 in the shore tower gate chamber 5. In order to control the release of the ecological flow downstream through the shore tower gate 8, the shore tower gate 8 is preferably set as a curved gate. The curved gate is more convenient for adjusting and controlling the downstream flow, which is beneficial to the control of the downstream flow and the control of the rising speed of the water storage water level.

[0040] Before the shore tower gate 8 is built, the multifunctional ecological water supply tunnel structure for the ultra-high rockfill dam of the present invention corresponds to the preliminary structure, which includes an ecological tunnel body 1, which is connected to the upstream river channel and the downstream river channel of the rockfill dam body 2 respectively, and a shaft lock chamber 3 is provided in the middle of the ecological tunnel body 1, and a flat gate 4 is provided in the shaft lock chamber 3. For this preliminary structure, since the ecological tunnel body 1 is only provided with a flat gate 4, and the shore tower gate chamber 5 and the corresponding shore tower gate 8 and other structures are not provided, the ecological water supply tunnel corresponding to the preliminary structure can be used for the maintenance and diversion of the initial diversion tunnel 6 and for flood season diversion, which can avoid serious erosion damage to the corresponding shore tower gate chamber 5 and shore tower gate 8 and other structures during the maintenance and diversion of the initial diversion tunnel 6 and the corresponding flood season diversion. The flat gate 4 has a simple structure and its erosion resistance is significantly better than other gates with more complex structures such as arc gates. Therefore, during the initial maintenance and diversion of the diversion tunnel 6 and the flood season diversion process, the flat gate 4 has stronger erosion resistance.

[0041] In addition, under normal circumstances, an outlet open channel section 9 is provided immediately downstream at the outlet of the ecological cave body 1. In this case, the present invention sets a bank tower lock chamber bottom plate 10 at the bottom of the upstream end of the outlet open channel section 9, and the bank tower lock chamber 5 is set on the bank tower lock chamber bottom plate 10. The bank tower lock chamber bottom plate 10 can be cast and constructed simultaneously with the bottom plate of the outlet open channel section 9 during the construction of the outlet open channel section 9, so as to avoid the need to remove the built outlet open channel bottom plate during the later construction. The bank tower lock chamber 5 can be directly constructed on the bank tower lock chamber bottom plate 10 during the later construction. Without loss of generality, the thickness of the bank tower lock chamber bottom plate 10 is usually thicker than the bottom plate thickness of other parts of the outlet open channel section 9 to support the construction of the bank tower lock chamber 5. Specifically, as shown in the accompanying drawings, the bank tower lock chamber bottom plate 10 can be provided with tooth groove structures at the upstream and downstream ends, respectively, and the bottom plate thickness of the upstream and downstream ends is significantly greater than the bottom plate thickness of other parts of the outlet open channel section 9.

[0042] In addition, in order to ensure that the ecological water supply continues to flow after the initial diversion tunnel 6 is closed by closing the gate, in the present invention, the elevation of the inlet bottom plate of the ecological tunnel body 1 is consistent with the elevation of the inlet bottom plate of the initial diversion tunnel 6.

[0043] In addition, since the ecological cave body 1 in the present invention needs to be able to divert during the maintenance process of the initial diversion cave 6 in the early stage and before the shore tower lock chamber 5 is built, and after the initial diversion cave 6 is repaired, it is necessary to supply ecological water to the downstream during the dam water storage period, there are requirements for the diameter of the ecological cave body 1, which is required to meet the above two work requirements respectively. Therefore, the diameter of the ecological cave body 1 in the present invention is: the larger value of the cave diameter required to meet the requirements of the maintenance flow during the maintenance process of the initial diversion cave 6 and the requirements of the ecological water supply flow during the water storage period. In addition, the ecological cave body 1 of the present invention is also used for flood diversion, but in the flood diversion process, since the initial diversion cave 6 and the ecological cave body 1 are used together as the channel for flood diversion during the flood season, the ecological cave body 1 only plays an auxiliary role in this role, so as to appropriately increase the flood diversion flow, and the main flood diversion flow is still met by the initial diversion cave 6.

[0044] In addition, in the present invention, the cross-sectional shape of the ecological tunnel body 1 is preferably set to a city gate tunnel type, which can improve the structural strength of the tunnel body.

[0045] In addition, the operation method of the multifunctional ecological water supply tunnel structure for ultra-high rockfill dam of the present invention is to combine the structural division of the multifunctional ecological water supply tunnel structure for ultra-high rockfill dam at different periods during its entire operation process to achieve different functional roles; the multifunctional ecological water supply tunnel structure for ultra-high rockfill dam comprises an ecological tunnel body 1, the ecological tunnel body 1 is respectively connected to the upstream river channel and the downstream river channel of the rockfill dam body 2, a vertical shaft lock chamber 3 is arranged in the middle of the ecological tunnel body 1, and a flat plate gate 4 is arranged in the vertical shaft lock chamber 3. The operation method comprises the following steps:

[0046] The first step is to open the gate in the initial diversion tunnel 6 and the flat gate 4 in the ecological tunnel body 1 during the flood season when the initial diversion tunnel 6 is in operation, so that the upstream water flows through the ecological tunnel body 1 and the initial diversion tunnel 6;

[0047] Step 2: During the initial maintenance period of the diversion tunnel 6, the flat gate 4 in the ecological tunnel body 1 is opened to allow the upstream water to flow through the ecological tunnel body 1;

[0048] Step 3: After the inspection and construction work of the initial diversion tunnel 6 is completed, the gate in the initial diversion tunnel 6 is opened to allow the upstream water to flow through the initial diversion tunnel 6, and then the flat gate 4 is lowered to block the ecological tunnel body 1, and then a bank tower lock chamber 5 is built at the outlet of the ecological tunnel body 1, and a bank tower gate 8 is set in the bank tower lock chamber 5, and the orifice of the bank tower lock chamber 5 is correspondingly connected to the outlet of the ecological tunnel body 1;

[0049] Step 4: The construction of the bank tower lock chamber 5 is completed and ready for operation;

[0050] Step 5: During the water storage period of the initial diversion tunnel 6, after the gate in the initial diversion tunnel 6 is closed, the flat gate 4 and the shore tower gate 8 are opened synchronously to release ecological water supply to the downstream through the ecological tunnel body 1;

[0051] Step 6: After the water level rises to the target water level, the flat gate 4 is lowered to block the ecological cave body 1, and then the permanent plug 11 in the ecological cave body 1 is constructed.

[0052] Among them, the first step corresponds to the flood season diversion function, that is, the flat gate 4 is opened during the flood season during the operation period of the initial diversion tunnel 6, and the flat gate 4 can be closed during the dry season; the second step corresponds to the maintenance diversion function during the maintenance process of the initial diversion tunnel 6, that is, the flat gate 4 is opened during the maintenance process of the initial diversion tunnel 6 to divert the flow, and provide operating conditions for the maintenance of the initial diversion tunnel 6. The above two functions are realized when the multifunctional ecological water supply tunnel structure for the ultra-high rockfill dam is the early structure. The third step is to construct the bank tower lock chamber 5 after the above flood season diversion function and the maintenance diversion function are used, and when the above two functions are no longer needed in the future, so as to construct the later structure on the basis of the above-mentioned early structure, and then play the function of releasing the ecological flow during the water storage period of the initial diversion tunnel 6. In this way, the multifunctional ecological water supply tunnel structure for the ultra-high rockfill dam of the present invention can realize multiple functions during its entire operation period, and achieve the purpose of one tunnel for multiple uses.

[0053] More specifically, in the process of decentralizing ecological flow, in order to facilitate the control of discharge flow, the shore tower gate 8 is preferably a curved gate; and in the above-mentioned fifth step, the curved gate is used to adjust the decentralized flow in the ecological cave body 1 while meeting the requirements of decentralized ecological water supply flow and the water level rising speed.

[0054] In addition, since the present invention will construct the shore tower lock chamber 5 after the inspection and construction work of the initial diversion tunnel 6 is completed and before the initial diversion tunnel 6 is closed for water storage, and the structure formed once the shore tower lock chamber 5 is constructed will no longer be used for flood season diversion; therefore, the present invention preferably arranges the inspection and construction work of the initial diversion tunnel 6 to be carried out during the most recent dry season before the initial diversion tunnel 6 is closed for water storage; and it is best to arrange the inspection and construction work of the initial diversion tunnel 6 and the initial diversion tunnel 6 to start closing the gates for water storage during the same dry season; that is, the inspection of the initial diversion tunnel 6, the construction of the shore tower lock chamber 5 and the closing of the gates for water storage in the initial diversion tunnel 6 are completed synchronously during the dry season.

[0055] Without loss of generality, the target water level mentioned in the sixth step of the present invention should be sufficient to allow the ecological flow to be discharged downstream through other tunnels; for example, when a later diversion tunnel 7 is provided, the elevation of the later diversion tunnel 7 is higher than the elevation of the initial diversion tunnel 6; therefore, when the water storage level reaches a level that allows the ecological flow to be discharged downstream through the later diversion tunnel 7, the construction of a permanent plug 13 in the ecological tunnel body 1 can be carried out, thereby avoiding the situation where the ecological flow discharged downstream is interrupted.

Claims

1. An operation method of a multifunctional ecological water supply tunnel structure for an ultra-high rockfill dam, characterized in that: The multifunctional ecological water supply tunnel structure for an ultra-high rockfill dam comprises an ecological tunnel body (1), the ecological tunnel body (1) respectively connects an upstream river channel and a downstream river channel of a rockfill dam body (2), a vertical shaft lock chamber (3) is arranged in the middle of the ecological tunnel body (1), and a flat plate gate (4) is arranged in the vertical shaft lock chamber (3). The operation method comprises the following steps: The first step is to open the gate in the initial diversion tunnel (6) and the flat gate (4) in the ecological tunnel body (1) during the flood season when the initial diversion tunnel (6) is in operation, so that the upstream water flows through the ecological tunnel body (1) and the initial diversion tunnel (6); Step 2: During the maintenance period of the initial diversion tunnel (6), the flat gate (4) in the ecological tunnel body (1) is opened to allow the upstream water to flow through the ecological tunnel body (1); Step 3: After the inspection and construction work of the initial diversion tunnel (6) is completed, the gate in the initial diversion tunnel (6) is opened to allow the upstream water to flow through the initial diversion tunnel (6), and then the flat gate (4) is lowered to block the ecological tunnel body (1), and then a bank tower lock chamber (5) is built at the outlet of the ecological tunnel body (1), and a bank tower gate (8) is arranged in the bank tower lock chamber (5). The bank tower gate (8) is a curved gate, and the orifice of the bank tower lock chamber (5) is correspondingly connected to the outlet of the ecological tunnel body (1); Step 4: The shore tower lock chamber (5) is completed and ready for operation; Step 5: During the water storage period of the initial diversion tunnel (6), after the gate in the initial diversion tunnel (6) is closed, the flat gate (4) and the shore tower gate (8) are opened synchronously to release ecological water supply to the downstream through the ecological tunnel body (1). The arc gate is used to adjust the release flow in the ecological tunnel body (1) while meeting the requirements of the release flow rate of ecological water supply and the requirements of the water level rise speed; Step 6: After the water level rises to the target water level, the flat gate (4) is lowered to block the ecological cave body (1), and then the permanent plug (11) in the ecological cave body (1) is constructed.

2. The operating method of the multifunctional ecological water supply tunnel structure for ultra-high rockfill dam according to claim 1, characterized in that: The maintenance and construction work of the initial diversion tunnel (6) is arranged to be carried out during the latest dry season before the initial diversion tunnel (6) is closed to store water.

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