Geomembrane anti-seepage connecting structure at excavation and backfilling junction of reservoir basin and real-time monitoring method

Abstract

According to the geomembrane anti-seepage connecting structure and the real-time monitoring method for the reservoir basin excavation and backfill junction, the air bags capable of controlling the air pressure are adopted to be connected with the reservoir basin excavation area HDPE geomembrane and the backfill area TPO geomembrane correspondingly, the height of the air bags is adjusted by changing the air pressure, the settlement difference between the backfill area and the excavation area of the reservoir basin excavation and backfill junction is made up, and the seepage-proof performance of the reservoir basin excavation and backfill junction is improved. And a special rolling area is arranged to improve the supporting capacity of a reservoir bottom cushion layer and a transition layer below an air bag, so that the problem that a geomembrane is locally pulled and damaged due to uncoordinated deformation of a foundation at the excavation and backfill junction of the reservoir basin is effectively solved. An air bag monitoring program suitable for different reservoir operation characteristic periods is established, deformation monitoring and efficient control over the geomembrane anti-seepage connection structure at the reservoir basin excavation and backfill junction are achieved, and a theoretical basis is provided for geomembrane anti-seepage connection design and operation safety at the reservoir basin excavation and backfill junction.

Description

Technical Field

[0001] The present invention relates to the field of water conservancy and hydropower engineering, and particularly relates to a geomembrane anti-seepage connection structure and a real-time monitoring method at the junction of reservoir basin excavation and backfill. Background Art

[0002] A geomembrane is a polymer flexible anti-seepage material, which has the characteristics of excellent anti-seepage performance, low cost, fast construction speed, etc., and has been widely used in anti-seepage projects such as earth-rock dams, reservoir basins, cofferdams, and dikes. Different types of geomembranes, such as TPO, HDPE, and PVC geomembranes, have their own advantages and disadvantages in terms of cost, anti-deformation performance, welding performance, etc. It is necessary to select geomembranes and related anti-seepage designs according to different engineering requirements.

[0003] In recent years, the development of pumped storage power stations in China has been rapid. Geomembranes are used as the anti-seepage body for the entire reservoir basin in many upper reservoirs of power stations, and the anti-seepage design of the reservoir basin geomembrane has become the focus of attention for engineering anti-seepage safety. At the junction of the excavation area and the backfill area of the reservoir basin, due to the large difference in the deformation modulus between the bedrock in the excavation area and the soil-rock backfill in the backfill area, under the action of the reservoir water pressure, different degrees of settlement differences will occur in the foundation at the junction of the reservoir basin excavation and backfill, resulting in local excessive deformation of the geomembrane at the junction of the reservoir basin excavation and backfill under the influence of uneven foundation settlement, and then causing local tensile failure of the geomembrane, forming cracks, holes and other damages, triggering reservoir leakage and affecting the safe operation of the reservoir.

[0004] In the prior art, the research on the deformation adaptability of reservoir basin geomembranes mainly focuses on the connection design between geomembranes and rigid structures such as intake towers and concrete panels. However, at the junction of the reservoir basin excavation and backfill, the situation of excessive local deformation of the geomembrane caused by uneven foundation settlement is easily ignored, resulting in local damage of the geomembrane at the excavation and backfill junction becoming a common leakage safety problem in reservoir basin projects. In addition, there is a lack of research on the dynamic deformation monitoring of geomembranes at the junction of reservoir basin excavation and filling under the condition of changing reservoir water levels.

[0005] In the current anti-seepage design, HDPE geomembranes with relatively low cost are usually selected as the anti-seepage body for large areas of the reservoir basin, and TPO geomembranes with relatively high cost and strong deformation ability are rarely selected. HDPE geomembranes are hard and tough, and their anti-deformation ability is relatively weak. They can be laid in the bedrock excavation area of the reservoir basin, but in the backfill area of the reservoir basin in front of the dam, it is not easy for HDPE geomembranes to adapt to the settlement deformation of soil-rock backfill, while TPO geomembranes with strong anti-deformation ability can adapt to the settlement deformation of soil-rock backfill. At present, the combined anti-seepage type of TPO geomembrane and HDPE geomembrane is rarely used in the engineering field, and the deformation coordination when laying geomembranes in the excavation area and backfill area of the reservoir basin is not fully considered, and the advantages of different types of geomembranes are not fully utilized. Summary of the Invention

[0006] The main object of the present invention is to provide a geomembrane anti-seepage connection structure and a real-time monitoring method at the junction of reservoir basin excavation and backfill, so as to solve the problems in the above-mentioned background technology.

[0007] To solve the above technical problems, the technical solution adopted by the present invention is as follows: It includes a TPO geomembrane and an HDPE geomembrane. The TPO geomembrane is laid in the reservoir basin backfill area, and the HDPE geomembrane is laid in the reservoir basin excavation area. At the ends of the TPO geomembrane and the HDPE geomembrane at the junction of the reservoir basin backfill area and the reservoir basin excavation area, there are L-shaped locks. On one side of the L-shaped lock, there is a level, and the level is installed on the TPO geomembrane and the HDPE geomembrane; There is also an airbag, which is embedded in the cushion layer above the reservoir basin backfill area at the junction of the reservoir basin backfill area and the reservoir basin excavation area. There is a barometric pressure monitor and a barometric pressure regulator on the airbag. At both ends of the airbag, there are L-shaped fasteners, which are respectively locked and connected with the L-shaped locks at the ends of the TPO geomembrane and the HDPE geomembrane; Below the airbag is a special compaction area, which is located in the reservoir basin backfill area between the reservoir bottom transition layer and the reservoir basin excavation area.

[0008] Preferably, the special compaction area uses well-graded rockfill and a high compaction standard, which has a large deformation modulus and improves the supporting capacity of the reservoir bottom cushion layer and the transition layer below the airbag.

[0009] Preferably, the airbag is arranged along the reservoir basin backfill area at the junction. In the initial state, the upper surface and the lower surface of the airbag are in a pre-shrunk state. The height change of the airbag is controlled by adjusting the size of the airbag through the barometric pressure regulator. In the highest state, the airbag is in a complete elliptical shape.

[0010] Preferably, the airbag is filled with high-rebound full-fat sponge.

[0011] Preferably, there is an expanding rubber waterstop strip between the L-shaped fastener and the L-shaped lock.

[0012] Preferably, fine silt sand is filled between the two ends of the airbag and the TPO geomembrane and the HDPE geomembrane. The fine silt sand is in a compacted state under pressure during the height change of the airbag.

[0013] Preferably, the end of the connection between the upper surface of the airbag and the L-shaped lock is treated with an anti-seepage sheet edge sealing, and the anti-seepage sheet is filled with GB flexible filler.

[0014] A real-time monitoring method for the junction of reservoir basin excavation and backfill with deformation self-adaptation, the method is as follows: It includes the following steps: S1. Determine the operation characteristic period R of the reservoir n and the water level rising and falling process: According to the operation conditions of the reservoir, determine the operation period T of the reservoir, the initial water level h 1 , the water level time history curve during the rising section y 1, constant operating water level h 2 , constant operating time t 2 , falling-stage water level time history curve y 2 , final water level h 3 and water level duration t 3 ; S2. Determine the reservoir operation characteristic period R n (T, h 1 , y 1 , h 2 , t 2 , y 2 , h 3 , t 3 ) corresponding airbag monitoring program B n ; S3. Identify the next-stage reservoir operation characteristic period R n+1 : If R n+1 is consistent with the reservoir operation characteristic period R i (i = 1~n), directly enter step S4; if R n+1 is not consistent with R i (i = 1~n), enter step S5; S4. Automatically call the airbag monitoring program: Automatically call airbag monitoring program B n , realize the self-adaptation of the uneven settlement difference at the junction of reservoir basin excavation and backfilling during this reservoir operation characteristic period; and real-time monitor the status of the level gauge. If the maximum reading of the level gauge within the reservoir operation characteristic period R n+1 reaches θ max , then enter step S6; S5. Establish a new airbag monitoring program: Repeat steps S1 and S2 to obtain the airbag monitoring program B n+1 corresponding to the reservoir operation characteristic period R n+1 ; S6. Optimize the airbag monitoring program: When the maximum reading of the level gauge reaches θ max , immediately turn off the airbag monitoring program, adjust the air pressure inside the airbag through the air pressure regulator, so that the maximum readings of both level gauges are less than θ min , until the reservoir operation characteristic period ends, and generate a new airbag monitoring program B n to overwrite the original airbag monitoring program.

[0015] Preferably, the specific steps of step S2 are as follows: S201, record the initial water level of the reservoir 1 Air bag pressure P 1 , adjust the level gauge above the TPO geomembrane and HDPE geomembrane at the junction of the reservoir basin excavation and backfill to a horizontal state; S202, when the reservoir starts to operate, the air pressure P in the air bag is monitored in real time by the air pressure monitoring meter. t During the change of reservoir water level, the reservoir bottom backfill and the bedrock in the excavation area at the junction of the reservoir basin excavation and backfill produce different settlements under the action of water pressure, and the TPO geomembrane and HDPE geomembrane at the level meter produce different degrees of position change and inclination. When the maximum degree of the two level meters reaches θ max When the pressure in the air bag is increased by the air pressure regulator, the air bag is raised to compensate for the relative settlement difference of the backfill area of ​​the reservoir basin below, until the maximum degrees of the two level gauges are both less than θ min ; S203, when the reservoir operation cycle T ends, obtain the reservoir operation characteristic cycle R n (T, h 1 ,y 1 ,h 2 , t 2 ,y 2 ,h 3 , t 3 ) Corresponding airbag monitoring program B n , including the air pressure P in the air bag 0-T Time course curve and air pressure regulation process.

[0016] Preferably, the air pressure regulator is controlled in real time by a remote computer to achieve inflation and exhaust regulation; the air pressure monitor and level meter readings are monitored in real time by the remote computer.

[0017] The present invention provides a geomembrane anti-seepage connection structure and a real-time monitoring method at the junction of reservoir basin excavation and backfilling, with the following beneficial effects: 1. The present invention adopts an air bag with controllable air pressure to connect the geomembranes in the excavation and backfill areas of the reservoir basin. The height of the air bag is adjusted by changing the air pressure to compensate for the settlement difference between the backfill area and the excavation area at the junction of the reservoir basin excavation and backfill under the action of reservoir water pressure, thereby realizing adaptive adaptation of uneven settlement differences at the junction of the reservoir basin excavation and backfill, and effectively solving the problem of local tensile damage of the geomembrane caused by the uncoordinated deformation of the foundation at the junction of the reservoir basin excavation and backfill.

[0018] 2. The present invention reduces the deformation degree of the local reservoir backfill area near the junction of the reservoir excavation and backfill by setting a special rolling area in the reservoir bottom transition layer and the reservoir basin excavation area, alleviates the problem of uneven foundation settlement at the junction of the reservoir basin excavation and backfill, and at the same time, improves the supporting capacity of the reservoir bottom cushion layer and the transition layer under the air bag, ensuring the stability of the air bag operation.

[0019] 3. The present invention takes into account the anti-deformation performance and cost advantages of different types of geomembranes, selects a hard and tough HDPE geomembrane to be laid on the bedrock foundation in the reservoir basin excavation area, and selects a soft and tough TPO geomembrane to be laid in the reservoir basin backfill area with a relatively smaller foundation deformation modulus, so that the deformation of the geomembrane in the reservoir basin backfill area is adapted to that of the soil and rock backfill material, avoiding the high cost problem caused by using TPO geomembranes throughout the reservoir basin, and giving full play to the lower cost advantage of HDPE geomembranes and the deformation adaptability of TPO geomembranes. At the same time, an L-shaped locking structure is used to connect the TPO geomembrane and the HDPE geomembrane to the airbag to form a complete reservoir basin anti-seepage body, effectively solving the problem of poor welding effect of HDPE geomembranes and TPO geomembranes.

[0020] 4. The present invention establishes a real-time monitoring program for the change of the airbag height with the reservoir water pressure in view of the change process of the reservoir water level in different operating characteristic periods of the reservoir, realizing the automatic monitoring and regulation of the adaptive process of the uneven settlement difference of the geomembrane at the junction of the reservoir basin excavation and backfill, and improving the operating efficiency of the TPO geomembrane-airbag-HDPE geomembrane anti-seepage connection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the drawings and embodiments: Figure 1 It is a schematic view of the anti-seepage connection structure of the geomembrane at the junction of the reservoir basin excavation and backfill of the present invention; Figure 2 It is a schematic view of the connection between the airbag and the geomembrane of the present invention; Figure 3 It is a schematic view of the initial state of the airbag of the present invention; Figure 4 It is a schematic view of the highest state of the airbag of the present invention; Figure 5 It is a schematic view of the anti-seepage sheets and fine silt on both sides of the locking connection between the airbag and the geomembrane of the present invention; In the figure: TPO geomembrane 1; HDPE geomembrane 2; airbag 3; L-shaped locking 4; L-shaped fastener 5; air pressure regulator 6; air pressure monitor 7; special compaction area 8; cushion layer 9; transition layer 10; reservoir basin backfill area 11; reservoir basin excavation area 12; anti-seepage sheet 13; GB flexible filler 14; expanded rubber water stop strip 15; fine silt 16; level 17. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Embodiment 1 As Figures 1 to 5As shown, the geomembrane anti-seepage connection structure at the junction of reservoir basin excavation and backfill includes a TPO geomembrane 1 and a HDPE geomembrane 2. The TPO geomembrane 1 is laid in the reservoir basin backfill area 11, and the HDPE geomembrane 2 is laid in the reservoir basin excavation area 12. The ends of the TPO geomembrane 1 and the HDPE geomembrane 2 located at the junction of the reservoir basin backfill area 11 and the reservoir basin excavation area 12 are provided with an L-shaped lock 4, and a level 17 is provided on one side of the L-shaped lock 4. The level 17 is installed on the TPO geomembrane 1 and the HDPE geomembrane 2; An air bag 3 is also provided, which is embedded in the cushion layer 9 above the reservoir backfill area 11 at the junction of the reservoir backfill area 11 and the reservoir excavation area 12. An air pressure monitor 7 and an air pressure regulator 6 are provided on the air bag 3. L-shaped fasteners 5 are provided at both ends of the air bag 3, which are locked and connected with L-shaped lock buckles 4 at the ends of the TPO geomembrane 1 and the HDPE geomembrane 2 respectively; Below the air bag 3 is a special rolling area 8, which is located in the reservoir basin backfill area 11 between the reservoir bottom transition layer 10 and the reservoir basin excavation area 12.

[0023] The hard and tough HDPE geomembrane 2 is used to lay on the bedrock foundation of the reservoir excavation area 12, and the soft and tough TPO geomembrane 1 is used to lay in the reservoir backfill area 11 where the foundation deformation modulus is relatively smaller, so that the geomembrane in the reservoir backfill area 11 is adapted to the deformation of the soil and rock backfill material, giving full play to the low cost advantage of the HDPE geomembrane 2 and the deformation adaptability of the TPO geomembrane 1. At the same time, the TPO geomembrane 1 and the HDPE geomembrane 2 are connected to the air bag 3 using an L-shaped lock structure to form a complete reservoir anti-seepage body.

[0024] By changing the air pressure to adjust the height of the air bag 3, the settlement difference between the backfill area and the excavation area at the junction of the reservoir basin excavation and backfill under the action of the reservoir water pressure is compensated, and the adaptive adaptation of the uneven settlement difference at the junction of the reservoir basin excavation and backfill is achieved, which effectively solves the problem of local tensile damage of the geomembrane caused by the uncoordinated foundation deformation at the junction of the reservoir basin excavation and backfill.

[0025] Preferably, the special rolling area 8 uses well-graded rockfill materials and high rolling standards, has a large deformation modulus, and improves the supporting capacity of the reservoir bottom cushion layer 9 and the transition layer 10 below the air bag 3.

[0026] By setting a special rolling area 8 in the reservoir basin backfill area 11 between the reservoir bottom transition layer 10 and the reservoir basin excavation area, the deformation degree of the local reservoir basin backfill area 11 near the junction of the reservoir basin excavation and backfill is reduced, and the problem of uneven foundation settlement at the junction of the reservoir basin excavation and backfill is alleviated. At the same time, the supporting capacity of the reservoir bottom cushion layer 9 and the transition layer 10 under the air bag 3 is improved, thereby ensuring the stability of the operation of the air bag 3.

[0027] Preferably, the air bag 3 is arranged along the reservoir backfill area 11 at the junction. In the initial state, the upper and lower surfaces of the air bag 3 are in a pre-contracted state. The size of the air bag is adjusted by the air pressure regulator 6 to control its height change. In the highest state, the air bag 3 is a complete ellipse.

[0028] Preferably, the air bag 3 is filled with a high-resilience full-fat sponge, which can provide a rebound force so that the air bag 3 can rebound effectively after being compressed and tightened and released.

[0029] Preferably, an expansion rubber water stop strip 15 is provided between the L-shaped fastener 5 and the L-shaped lock buckle 4. The expansion rubber water stop strip 15 can ensure the sealing of the connection.

[0030] Preferably, fine sand 16 is filled between the two ends of the air bag 3 and the TPO geomembrane 1 and the HDPE geomembrane 2. During the height change of the air bag 3, the fine sand 16 is compressed and in a dense state.

[0031] Preferably, the end of the connection between the upper surface of the air bag 3 and the L-shaped lock buckle 4 is sealed with an anti-seepage sheet, and the anti-seepage sheet is filled with GB flexible filler 14 to further improve the sealing of the connection.

[0032] Example 2 In conjunction with Example 1, the deformation-adaptive real-time monitoring method for the junction of reservoir basin excavation and backfilling is further described, and the method comprises the following steps: Step 1: Determine the reservoir operation characteristic period R n And the water level rise and fall process: determine the reservoir operating conditions, determine the reservoir operation cycle T, the initial water level h 1 , rising section water level time history curve y 1 , constant operating water level h 2 , constant running time t 2 , the time history curve of water level in the descending section y 2 , final water level h 3 and water level duration t 3 ; Step 2: Determine the reservoir operation characteristic period R n (T, h 1 ,y 1 ,h 2 , t 2 ,y 2 ,h 3 , t 3 ) Corresponding airbag monitoring program B n , specifically including the following steps: Step 201: Record the initial water level of the reservoir h 1 Air bag pressure P 1 , adjust the level gauge above the TPO geomembrane and HDPE geomembrane at the junction of the reservoir basin excavation and backfill to a horizontal state; Step 202: When the reservoir starts to operate, the air pressure P in the air bag is monitored in real time by the air pressure monitoring meter. t During the change of reservoir water level, the reservoir bottom backfill and the bedrock in the excavation area at the junction of the reservoir basin excavation and backfill produce different settlements under the action of water pressure, and the TPO geomembrane and HDPE geomembrane at the level meter produce different degrees of position change and inclination. When the maximum degree of the two level meters reaches θ max When the pressure in the air bag is increased by the air pressure regulator, the air bag is raised to compensate for the relative settlement difference of the backfill area of ​​the reservoir basin below, until the maximum degrees of the two level gauges are both less than θ min ; Step 203: When the reservoir operation cycle T ends, obtain the reservoir operation characteristic cycle R n (T, h 1 ,y 1 ,h 2 , t 2 ,y 2 ,h 3 , t 3 ) Corresponding airbag monitoring program B n , including the air pressure P in the air bag 0-T Time course curve and air pressure regulation process; Step 3: Identify the reservoir operation characteristic period R in the next stage n+1 :If R n+1 and the reservoir operation characteristic period R i (i=1~n) matches, go directly to step 4; if R n+1 With R i If (i=1~n) does not match, go to step 5; Step 4: Automatically call the airbag monitoring program: Automatically call the airbag monitoring program B n , to achieve the adaptive adaptation of the uneven settlement difference at the junction of the reservoir basin excavation and backfilling within the reservoir operation characteristic period; and monitor the level status in real time. If the reservoir operation characteristic period R n+1 The maximum degree of the internal level reaches θ max , then go to step 6; Step 5: Establish a new airbag monitoring program: Repeat steps 1 and 2 to obtain the reservoir operation characteristic cycle R n+1 Corresponding airbag monitoring program B n+1 ; Step 6: Optimize the airbag monitoring program: The maximum degree of the level reaches θ max When the airbag monitoring program is turned off immediately, the airbag pressure is adjusted through the air pressure regulator so that the maximum readings of the two level gauges are both less than θ min , until the reservoir operation characteristic cycle ends and a new air bag monitoring program B is generated n Overwrite the original airbag monitoring program.

[0033] Preferably, the air pressure regulator 6 is controlled in real time by a remote computer to achieve air charging and discharging regulation; the readings of the air pressure monitor 7 and the level gauge 17 are monitored in real time by the remote computer.

[0034] A real-time monitoring program for the change of the airbag height with the reservoir water pressure is established for the water level change process in different characteristic periods of reservoir operation, realizing the automatic monitoring and regulation of the uneven settlement difference of the geomembrane at the junction of the reservoir basin excavation and backfilling, and improving the operation efficiency of the TPO geomembrane-airbag-HDPE geomembrane anti-seepage connection structure.

[0035] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. The geomembrane anti-seepage connection structure at the junction of reservoir basin excavation and backfill is characterized by: The invention comprises a TPO geomembrane (1) and a HDPE geomembrane (2), wherein the TPO geomembrane (1) is laid in a reservoir backfill area (11), and the HDPE geomembrane (2) is laid in a reservoir excavation area (12), and an L-shaped lock (4) is provided at the end of the TPO geomembrane (1) and the HDPE geomembrane (2) located at the junction of the reservoir backfill area (11) and the reservoir excavation area (12), and a level (17) is provided on one side of the L-shaped lock (4), and the level (17) is installed on the TPO geomembrane (1) and the HDPE geomembrane (2); An air bag (3) is also provided. The air bag (3) is embedded in a cushion layer (9) above the reservoir backfill area (11) at the junction of the reservoir backfill area (11) and the reservoir excavation area (12). An air pressure monitor (7) and an air pressure regulator (6) are provided on the air bag (3). L-shaped fasteners (5) are provided at both ends of the air bag (3) and are respectively locked and connected with L-shaped lock buckles (4) at the ends of the TPO geomembrane (1) and the HDPE geomembrane (2). Below the air bag (3) is a special rolling area (8), and the special rolling area (8) is located in the reservoir basin backfill area (11) between the reservoir bottom transition layer (10) and the reservoir basin excavation area (12).

2. According to claim 1, the geomembrane anti-seepage connection structure at the junction of reservoir basin excavation and backfilling is characterized by: The special compaction area (8) uses well-graded rockfill materials and a high compaction standard, has a large deformation modulus, and improves the support capacity of the reservoir bottom cushion layer (9) and the transition layer (10) below the air bag (3).

3. According to claim 1, the geomembrane anti-seepage connection structure at the junction of reservoir basin excavation and backfilling is characterized by: The air bag (3) is arranged along the reservoir backfill area (11) at the junction. In the initial state, the upper surface and the lower surface of the air bag (3) are in a pre-contracted state. The size of the air bag is adjusted by the air pressure regulator (6) to control its height change. In the highest state, the air bag (3) is in a complete elliptical shape.

4. According to claim 3, the geomembrane anti-seepage connection structure at the junction of reservoir basin excavation and backfilling is characterized by: The air bag (3) is filled with high-resilience full-fat sponge.

5. According to claim 1, the geomembrane anti-seepage connection structure at the junction of reservoir basin excavation and backfilling is characterized by: An expansion rubber water stop strip (15) is provided between the L-shaped fastener (5) and the L-shaped lock buckle (4).

6. According to claim 1, the geomembrane anti-seepage connection structure at the junction of reservoir basin excavation and backfilling is characterized by: Powdered fine sand (16) is filled between the two ends of the air bag (3) and the TPO geomembrane (1) and the HDPE geomembrane (2). During the change in height of the air bag (3), the powdered fine sand (16) is compressed and in a dense state.

7. According to claim 1, the geomembrane anti-seepage connection structure at the junction of reservoir basin excavation and backfilling is characterized by: The end portion where the upper surface of the air bag (3) is connected to the L-shaped lock buckle (4) is sealed with an anti-seepage sheet, and the anti-seepage sheet is filled with GB flexible filler (14).

8. The real-time monitoring method of the geomembrane anti-seepage connection structure at the junction of the reservoir basin excavation and backfill according to claims 1 to 7, the method comprising the following steps: S1. Determine the reservoir operation characteristic period R n And water level rise and fall process: According to the reservoir operation conditions, determine the reservoir operation cycle T, initial water level h 1. Rising water level time curve y 1. Constant operating water level h 2. Constant running time t 2. Time history curve of water level in the descending section y 2. Final water level h 3 and water level duration t 3; S2. Determine the reservoir operation characteristic period R n (T, h 1, y 1, h 2, t 2, y 2, h 3. t 3) Corresponding airbag monitoring program B n ; S3. Identify the reservoir operation characteristic period R in the next stage n+1 :If R n+1 and the reservoir operation characteristic period R i (i=1~n) matches, then go directly to step S4; if R n+1 With R i If (i=1~n) does not match, go to step S5; S4, Automatically call the airbag monitoring program: Automatically call the airbag monitoring program B n , to achieve the adaptive adaptation of the uneven settlement difference at the junction of the reservoir basin excavation and backfilling within the reservoir operation characteristic period; And monitor the status of the level meter (17) in real time. If the reservoir operation characteristic period R n+1 The maximum degree of the internal level (17) reaches θ max , then proceed to step S6; S5. Establish a new air bag monitoring program: Repeat steps S1 and S2 to obtain the characteristic cycle R of the reservoir operation. n+1 Corresponding airbag monitoring program B n+1 ; S6. Optimize the airbag monitoring program: the maximum degree of the level gauge (17) reaches θ max When the air bag monitoring program is immediately turned off, the air pressure in the air bag (3) is adjusted through the air pressure regulator (6) so that the maximum readings of the two level gauges (17) are both less than θ min , until the reservoir operation characteristic cycle ends and a new air bag monitoring program B is generated n Overwrite the original airbag monitoring program.

9. The real-time monitoring method of the geomembrane anti-seepage connection structure at the junction of reservoir basin excavation and backfilling according to claim 8, wherein the specific steps of step S2 are as follows: S201, recording the air pressure P1 in the air bag when the reservoir has an initial water level h1, and adjusting the level gauge (17) above the TPO geomembrane (1) and the HDPE geomembrane (2) at the junction of the reservoir basin excavation and backfill to a horizontal state; S202, when the reservoir starts to operate, the air pressure P in the air bag (3) is monitored in real time by the air pressure monitoring meter (7). t During the change of reservoir water level, the reservoir bottom backfill material and the bedrock in the excavation area at the junction of the reservoir basin excavation and backfill produce different settlements under the action of water pressure, and the TPO geomembrane (1) and the HDPE geomembrane (2) at the level gauge (17) produce different degrees of position change and inclination. When the maximum degree of the two level gauges (17) reaches θ max When the pressure in the air bag (3) is increased by the air pressure regulator (6), the air bag (3) is raised to compensate for the relative settlement difference of the reservoir backfill area (11) below, until the maximum readings of the two level gauges (17) are both less than θ min ; S203, when the reservoir operation cycle T ends, obtain the reservoir operation characteristic cycle R n (T, h1, y1, h2, t2, y2, h3, t3) corresponding to the airbag monitoring program B n , including the air pressure P inside the air bag (3) 0-T Time course curve and air pressure regulation process.

10. A real-time monitoring method for the geomembrane anti-seepage connection structure at the junction of reservoir basin excavation and backfill according to any one of claims 8 or 9, wherein: the air pressure regulator (6) is controlled in real time by a remote computer to achieve inflation and exhaust regulation; the readings of the air pressure monitor (7) and the level meter (17) are monitored in real time by the remote computer.

Images