Groundwater level control method and system

Abstract

The present application provides a groundwater level control method and system, which relate to the technical field of foundation pit dewatering, the method comprising: obtaining dewatering data; the dewatering data comprising: the groundwater level elevation of the observation well and the dewatering well in the area to be excavated, and the water output of the dewatering well; calculating a predicted value of the groundwater level drop in the area to be excavated based on the dewatering data; the predicted value of the water level drop comprises: calculating a correction factor based on the dewatering data and the predicted value of the water level drop; obtaining a corrected water level prediction model based on the correction factor; the water level prediction model is configured to calculate a corrected value of the groundwater level drop in the area to be excavated based on the water output of the dewatering well; inputting the target water level drop of the groundwater in the area to be excavated into the water level prediction model, and determining the target water output of each dewatering well when the total drainage volume of the dewatering well is minimized, so as to achieve precise control of the groundwater level elevation, avoid excessive groundwater extraction leading to increased energy consumption, and avoid safety hazards caused by rising water levels.

Description

Technical Field

[0001] The present application relates to the technical field of foundation pit dewatering, and in particular to a groundwater level control method and system. Background Art

[0002] Foundation pit dewatering refers to the dewatering work done when the groundwater level is higher than the excavation bottom surface during foundation pit excavation, and groundwater will continuously seep into the pit to ensure that the foundation pit can be constructed under dry conditions, to prevent slope instability, foundation sand flow, pit bottom uplift, pit bottom pipe burst and reduced foundation bearing capacity.

[0003] Current dewatering control methods usually include: setting up drainage wells, using pumps, manual monitoring and manual adjustment, etc., by pumping out the groundwater under the foundation pit so that the groundwater level meets the depth requirements of the foundation pit.

[0004] Due to the manual adjustment of drainage equipment such as pumps, it is impossible to accurately control the groundwater level. Generally, the power of the water pump is modulated to the maximum or the water pump is operated according to the calculated set power. However, due to the large area of the foundation pit and the large number of water pumps used, the electricity consumption of the water pump is extremely high, and the operating power of the water pump cannot be controlled in real time according to the groundwater level, resulting in the inability to accurately control the groundwater level, which can easily cause safety hazards. Summary of the Invention

[0005] The present application provides a groundwater level control method and system to solve the current technical problem that the groundwater level cannot be accurately controlled, which may lead to safety hazards.

[0006] In a first aspect, the present application provides a groundwater level control method, which is applied to an area to be excavated, wherein a plurality of dewatering wells are provided on the periphery of the area to be excavated, and a water pump is provided in the dewatering wells, and the water pump is used to pump water out of the dewatering wells; the method comprises:

[0007] Acquire precipitation data; the precipitation data includes: the groundwater level elevation in the area to be excavated and the water output of the precipitation well;

[0008] According to the precipitation data, the predicted value of groundwater level drop in the area to be excavated is calculated; the predicted value of groundwater level drop is:

[0009] S i = ;

[0010] Where, S i Lowering the groundwater level in the area to be excavated; H is the thickness of the aquifer in the area to be excavated; For thej The water output of the precipitation well; k is the permeability coefficient of the aquifer in the area to be excavated; R is the influence radius; For the j The distance from the center of the drainage well to the center of the area to be excavated; n is the number of precipitation wells;

[0011] According to the precipitation data and the water level drop prediction value, a correction factor is calculated; the correction factor is:

[0012] α= S 实 ÷ ;

[0013] Where, S 实 The measured value of the groundwater level drop in the area to be excavated;

[0014] According to the correction factor, a water level prediction model is obtained; the water level prediction model is configured to calculate a water level drop correction value of groundwater in the area to be excavated according to the water output of the dewatering well; the water level drop correction value is:

[0015] S 修 =α×( );

[0016] The target groundwater level drop in the area to be excavated is input into the water level prediction model to determine the target water output of each precipitation well when the total drainage volume of the precipitation well is minimized; the total drainage volume is: Q 总 = q 1+ q 2+ q 3+…… q j .

[0017] In some embodiments, the water level prediction model is further configured to:

[0018] Get the water level elevation of any two adjacent precipitation wells;

[0019] Obtaining the water level elevation of an observation well; the observation well is located in the middle area outside the two adjacent precipitation wells; the horizontal distances between the observation well and the two adjacent precipitation wells are respectively a first distance and a second distance; the observation well and the precipitation well have the same depth;

[0020] According to the water level elevation of the observation well and the dewatering wells on both sides, the hydraulic gradient in the observation well area is obtained; the hydraulic gradient is: J=[(h 1降 -h观 )÷L 11 +(h 2降 -h 观 )÷L 12 ]÷2;

[0021] Where h 观 is the water level elevation of the observation well; h 1降 and h 2降 are the water level elevations of the two precipitation wells adjacent to the observation well; L 11 is the first distance; L 12 is the second distance;

[0022] When it is determined that the water level drop of the observation well is the target water level drop of the groundwater in the area to be excavated, the target water level drops of the precipitation wells adjacent to the observation well on both sides are; the target water level drops of the precipitation wells are:

[0023] S 降 =S 观 +L 观降 ×J;

[0024] Where, L 观降 is the horizontal distance between the observation well and the adjacent precipitation wells on both sides; J is the hydraulic gradient of the observation well area;

[0025] Obtaining the target water level elevation of the precipitation well according to the target water level drop and the initial water level elevation of the precipitation well;

[0026] According to the target water level elevation of the dewatering well, the target operating power and water output of the water pump are adjusted so that the real-time water level elevation of the dewatering well is maintained within the target water level elevation control range.

[0027] In some embodiments, the measured value of the groundwater level drop in the area to be excavated is obtained by the following steps:

[0028] Obtaining the real-time water level elevation of the observation well;

[0029] The water level drop of the observation well is calculated based on the initial water level elevation and the real-time water level elevation of the observation well; the water level drop of the observation well is:

[0030] S 观 =h 观初 -h 观实 ;

[0031] Where h 观初 is the initial water level elevation of the observation well; h 观实 The real-time water level elevation of the observation well;

[0032] According to the minimum water level drop of the observation well, the actual measured value of the groundwater level drop in the area to be excavated is determined.

[0033] In some embodiments, the method further comprises:

[0034] According to the water level drop of the observation well, the target water level drop of the precipitation wells adjacent to the observation well is obtained; the target water level drop of the precipitation well is:

[0035] S 降 =S 观 +L 观降 ×J;

[0036] Where, L 观降 is the horizontal distance between the observation well and the adjacent precipitation wells on both sides; J is the hydraulic gradient of the observation well area;

[0037] Obtaining the target water level elevation of the precipitation well according to the target water level drop and the initial water level elevation of the precipitation well;

[0038] According to the target water level elevation, the target operating power and water output of the water pump are adjusted.

[0039] In some embodiments, the step of adjusting the target operating power and water output of the water pump according to the target water level elevation includes:

[0040] Obtaining a water level control index of the precipitation well according to the target water level elevation of the precipitation well;

[0041] The target operating power and water output of the water pump are adjusted based on the water level control index and the real-time water level elevation of the dewatering well, so that the real-time water level elevation of the dewatering well is maintained within a target water level elevation control range. The target water level elevation control range is below the target water level elevation.

[0042] In some embodiments, the water level control indicators include:

[0043] Target water level, safe water level, frequency increase water level, frequency decrease water level, stop water level;

[0044] The safety water level is: h1=h j -0.5;

[0045] Where h j is the target water level, which is equal to the target water level elevation of the precipitation well;

[0046] The frequency-increasing water level is: h2=h1-1;

[0047] The frequency reduction water level is: h3=h2-2;

[0048] The stop water level is: h4=h3-3;

[0049] The safety water level is greater than the frequency-increasing water level, the frequency-increasing water level is greater than the frequency-decreasing water level, and the frequency-decreasing water level is greater than the stop water level.

[0050] In some embodiments, the step of adjusting the target operating power and water output of the water pump according to the water level control index and the real-time water level elevation of the dewatering well so as to maintain the real-time water level elevation of the dewatering well within the target water level elevation control range includes:

[0051] If the real-time water level of the dewatering well is greater than or equal to the safety water level, the water pump is controlled to operate at full frequency;

[0052] If the real-time water level elevation of the dewatering well is less than the safety water level and greater than or equal to the frequency-increasing water level, the power of the water pump is controlled to increase gradually according to the set power until the real-time water level elevation of the dewatering well is less than the frequency-increasing water level;

[0053] If the real-time water level of the dewatering well is less than the frequency-increasing water level and greater than or equal to the frequency-decreasing water level, the water pump is controlled to operate at a preset power;

[0054] If the real-time water level elevation of the dewatering well is less than the frequency reduction water level and greater than or equal to the stop water level, the power of the water pump is controlled to be gradually reduced according to the set power until the real-time water level elevation of the dewatering well is greater than the frequency reduction water level;

[0055] If the real-time water level elevation of the dewatering well is lower than the stop water level, the water pump is controlled to stop running until the real-time water level elevation of the dewatering well rises to the frequency-increasing water level, the water pump is started and the power of the water pump is controlled to increase gradually according to the set power.

[0056] In some embodiments, before the step of obtaining precipitation data, the following steps are included:

[0057] Dividing the area to be excavated into a plurality of partitions; the partitions are divided according to the depth to be excavated and the construction sequence; the length of each partition is less than a preset length;

[0058] The precipitation wells are arranged at the periphery of the partition; and the distance between the precipitation wells is less than a preset distance.

[0059] A second aspect of the present application provides a groundwater level control system, which is applied to an area to be excavated, wherein a plurality of dewatering wells are provided on the periphery of the area to be excavated, and a water pump is provided in each dewatering well, and the water pump is used to pump water out of the dewatering well; the system comprises:

[0060] A data acquisition module, wherein the data acquisition module is configured to:

[0061] Acquire precipitation data; the precipitation data includes: the groundwater level elevation in the area to be excavated and the water output of the precipitation well;

[0062] A data processing module, wherein the data processing module is configured to:

[0063] According to the precipitation data, the predicted value of groundwater level drop in the area to be excavated is calculated; the predicted value of groundwater level drop is:

[0064] S i = ;

[0065] Where, S i Lowering the groundwater level in the area to be excavated; H is the thickness of the aquifer in the area to be excavated; For the j The water output of the precipitation well; k is the permeability coefficient of the aquifer in the area to be excavated; R is the influence radius; For the j The distance from the center of the drainage well to the center of the area to be excavated; n is the number of precipitation wells;

[0066] According to the precipitation data and the water level drop prediction value, a correction factor is calculated; the correction factor is:

[0067] α= S 实 ÷ ;

[0068] Where, S 实 The measured value of the groundwater level drop in the area to be excavated;

[0069] According to the correction factor, a water level prediction model is obtained; the water level prediction model is configured to calculate a water level drop correction value of groundwater in the area to be excavated according to the water output of the dewatering well; the water level drop correction value is:

[0070] S 修 =α×( );

[0071] A data output module, wherein the data output module is configured to:

[0072] The target groundwater level drop in the area to be excavated is input into the water level prediction model to determine the target water output of each precipitation well when the total drainage volume of the precipitation well is minimized; the total drainage volume is: Q 总 = q 1+ q 2+ q 3+…… q j ;

[0073] An early warning module is configured to:

[0074] When the real-time water level elevation of the precipitation well is greater than the warning water level, an alarm is sounded and a warning message is sent to a setting device; the warning water level is greater than the safety water level; the warning message includes: the well number and water level status of the precipitation well whose real-time water level elevation is greater than the warning water level; the water level status includes: the real-time water level elevation and the safety water level of the precipitation well.

[0075] In some embodiments, the warning module is configured with a warning light; the warning module is further configured to:

[0076] When the real-time water level of the precipitation well is greater than or equal to the safe water level, the warning light is controlled to display red;

[0077] When the real-time water level of the precipitation well is lower than the safe water level and greater than or equal to a preset value, the warning light is controlled to display yellow; the preset value is: X=h1-0.5;

[0078] In the formula, h1 is the safe water level;

[0079] When the real-time water level elevation of the precipitation well is less than the preset value, the warning light is controlled to display green.

[0080] The present application provides a groundwater level control method and system, which are applied to an area to be excavated, wherein a plurality of dewatering wells are provided on the periphery of the area to be excavated, and a water pump is provided in the dewatering wells, and the water pump is used to pump water out of the dewatering wells; the method comprises: obtaining dewatering data; the dewatering data comprises: the water level elevation of the groundwater in the area to be excavated and the water output of the dewatering wells; calculating a predicted value of the groundwater level drop in the area to be excavated based on the dewatering data; the predicted value of the water level drop is:

[0081] S i = ;

[0082] Where, S i Lowering the groundwater level in the area to be excavated; His the thickness of the aquifer in the area to be excavated; For the j The water output of the precipitation well; k is the permeability coefficient of the aquifer in the area to be excavated; R is the influence radius; For the j The distance from the center of the drainage well to the center of the area to be excavated; n is the number of precipitation wells;

[0083] According to the precipitation data and the water level drop prediction value, a correction factor is calculated; the correction factor is:

[0084] α= S 实 ÷ ;

[0085] Where, S 实 The measured value of the groundwater level drop in the area to be excavated;

[0086] According to the correction factor, a water level prediction model is obtained; the water level prediction model is configured to calculate a water level drop correction value of groundwater in the area to be excavated according to the water output of the dewatering well; the water level drop correction value is:

[0087] S 修 =α×( );

[0088] The target groundwater level drop in the area to be excavated is input into the water level prediction model to determine the target water output of each precipitation well when the total drainage volume of the precipitation well is minimized; the total drainage volume is: Q 总 = q 1+ q 2+ q 3+…… q j , in order to solve the problem that the groundwater level cannot be accurately controlled, which may lead to safety hazards.

[0089] The present application provides a groundwater level control method and system, which has the following beneficial effects: accurately controlling the thickness of the aquifer in the area to be excavated, and at the same time enabling the operating power of the water pump in the precipitation well to reach the minimum value, thereby reducing the power consumption of the water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0090] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0091] Figure 1 This is a flow chart of the groundwater level control method in this application;

[0092] Figure 2 This is a schematic diagram of the water level indicators of the precipitation well in this application;

[0093] Figure 3 This is the first schematic diagram of the distribution structure of the precipitation wells and observation wells in this application;

[0094] Figure 4 This is the second schematic diagram of the distribution structure of the precipitation wells and observation wells in this application;

[0095] Figure 5 This is a schematic diagram of the hydraulic gradient of the observation well area in this application;

[0096] Figure 6 This is a specific application scenario diagram of the groundwater level control method in this application. DETAILED DESCRIPTION

[0097] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0098] Because some technologies cannot accurately control the groundwater level, which may easily lead to safety hazards, in order to solve this technical problem, this application provides a groundwater level control method and system. The groundwater level control method and system are described below:

[0099] like Figure 1 As shown, this is a flow chart of the groundwater level control method in this application.

[0100] In a first aspect, the present application provides a groundwater level control method, which is applied to an area to be excavated, wherein a plurality of dewatering wells are provided on the periphery of the area to be excavated, and a water pump is provided in the dewatering wells, and the water pump is used to pump water out of the dewatering wells; the method comprises the following steps:

[0101] S100: Obtaining precipitation data; the precipitation data includes: the groundwater level in the area to be excavated and the water output of the precipitation well. The groundwater level in the area to be excavated is obtained by a liquid level sensor installed in the observation well, and the water output of the precipitation well is obtained by a flow sensor installed at the water outlet of the water pump. The water level is the height from the free water surface in the well to the wellhead.

[0102] Before the step of obtaining precipitation data, the following steps are included:

[0103] S80: Divide the area to be excavated into multiple partitions; the partitions are divided according to the depth to be excavated and the construction sequence; the length of the partition is less than the preset length; define multiple precipitation partitions according to parameters such as the excavation depth of the area to be excavated, the construction sequence, and the precipitation period, and the length of each partition is not more than 50 meters. Then, the basic parameters of the precipitation design, such as the well location coordinates, wellhead elevation, initial water level elevation, pump volume, power, etc., are input into the system for subsequent calculation of the target water output of the precipitation well.

[0104] Understandably, the area to be excavated may cover a large area, resulting in inconsistent groundwater levels within the area. Therefore, the area to be excavated needs to be divided according to the groundwater level within the area to ensure that the difference between the maximum and minimum groundwater levels within the divided areas is within a preset range. The area to be excavated can be further divided based on parameters such as the specific construction sequence and precipitation cycle. To ensure accurate control of the groundwater level, the length of the sub-areas is generally less than the preset length, and generally no more than 50 meters.

[0105] S90: The dewatering wells are arranged at the periphery of the partitions; the distance between the dewatering wells is less than a preset distance. The dewatering wells are arranged at the periphery of the partitions to pump out groundwater within the area to be excavated, so that the groundwater level within the area to be excavated is lower than the depth to be excavated within the area to be excavated. To ensure that the water pumped through the dewatering wells can affect the thickness of the aquifer within the area to be excavated, the distance between the dewatering wells is less than a preset distance to ensure that groundwater is pumped out through the dewatering wells arranged at the periphery of the area to be excavated, thereby reducing the thickness of the aquifer within the area to be excavated.

[0106] The thickness of the aquifer in the area to be excavated is obtained by the following steps:

[0107] Obtaining the water level of an observation well located outside the dewatering well, and obtaining the thickness of the aquifer within the area to be excavated based on the maximum water level of the observation well. The observation well is used to indicate the groundwater level within the area to be excavated.

[0108] like Figure 3 and Figure 4 As shown, this is a schematic diagram of the structure in which the observation wells and precipitation wells in this application are distributed outside the area to be excavated.

[0109] For example, before starting dewatering work, the area to be excavated must first be divided into multiple zones. The division criteria include parameters such as the excavation depth of the area to be excavated, the construction sequence, and the dewatering period. This division not only improves the efficiency and safety of subsequent construction, but also ensures that the dewatering effect achieves the desired effect. After the various zones of the area to be excavated are divided, observation wells are first set up. Generally, the depth of the observation wells is set to be greater than the excavation depth of the area to be excavated. The number of observation wells is determined by the size of the area to be excavated. Usually, the observation wells are set outside the dewatering wells. This can effectively monitor the dynamics of the groundwater level and avoid interference with the observation data caused by construction activities. By setting a liquid level sensor in the observation well, the groundwater level elevation in the observation well is obtained. Generally, the maximum water level elevation of the water level elevation data in each observation well is used as the aquifer thickness in the area to be excavated, so as to improve the accuracy of the aquifer thickness data in the area to be excavated and lay a solid foundation for subsequent excavation operations.

[0110] For example, by setting up precipitation wells, such as Figure 3 and Figure 4 As shown, the dewatering well is Jn; a water pump is set in the dewatering well to pump out the groundwater in the dewatering well, thereby lowering the groundwater level in the area to be excavated. Among them, the dewatering well is set outside the area to be excavated, and the observation well is set outside the dewatering well, as shown in FIG. Figure 3 and Figure 4 As shown, the observation well is Gm; the wellhead width of the dewatering well is much larger than that of the observation well. As can be understood, since the primary function of the dewatering well is to lower the groundwater level within the excavation area, it is important to ensure that as much groundwater as possible can infiltrate and collect within the dewatering well. A wide wellhead design effectively increases the groundwater infiltration area and improves dewatering efficiency. Furthermore, a wide wellhead helps pump groundwater more efficiently, ensuring a rapid and stable dewatering process. The primary function of the observation well is to obtain accurate data on the groundwater level within the excavation area. Therefore, the wellhead width of the observation well does not need to be excessively large. An overly large wellhead not only increases construction difficulty and cost but may also cause unnecessary interference with the dewatering well installation. The observation well's wellhead width only needs to be wide enough to accommodate monitoring equipment such as liquid level sensors and provide accurate and reliable groundwater dewatering data. The number of dewatering wells is determined based on the size of the excavation area, with the goal of accurately and quickly lowering the groundwater level within the area.

[0111] S200: Calculate the predicted value of groundwater level drop in the area to be excavated based on the precipitation data; the predicted value of groundwater level drop is:

[0112] S i = ;

[0113] Where, S i The groundwater level drop in the area to be excavated, that is, the groundwater level drop at any point in the foundation pit; H is the thickness of the aquifer in the area to be excavated, i.e. the thickness of the phreatic aquifer; For the j The water output of the precipitation well (m³ / d); k is the permeability coefficient of the aquifer in the area to be excavated; R is the influence radius; For the j The distance from the center of the first dewatering well to the center of the area to be excavated, that is, j Distance from the center of the well to the groundwater level calculation point (m); n is the number of precipitation wells;

[0114] Among them, the permeability coefficient of the aquifer in the area to be excavated is k It can be measured by the water level gradient method, according to Darcy's law k =fracvI (v is the groundwater velocity, I is the water level gradient) to calculate the permeability coefficient. Groundwater velocity can be calculated using the indicator method (introducing an indicator such as a dye or salt solution, measuring the time it takes for it to appear in a downstream observation well, and then calculating the velocity based on the distance) or the charge method. The water level gradient can be calculated by measuring the groundwater level in the area to be excavated. The water level gradient can be calculated by calculating the ratio of the water level difference to the distance.

[0115] Specifically, the permeability coefficient of the aquifer in the area where the dewatering well is located is measured using the following method: First, the groundwater flow velocity within the dewatering well to be measured is determined. An indicator (such as a dye or salt solution) is then injected into the upstream dewatering well or observation hole, and the time it takes for the indicator to appear in the well is measured. The groundwater flow velocity is calculated based on the distance between the dewatering well to be measured and the upstream dewatering well or observation hole. The groundwater flow velocity is calculated as follows: groundwater flow velocity = distance between the dewatering well to be measured and the time it takes for the indicator to reach the well after being injected into the upstream dewatering well or observation hole. Secondly, the water level gradient of the dewatering well to be measured is determined. The water level gradient is calculated by calculating the ratio of the water level difference between each dewatering well and the distance between them. Finally, the permeability coefficient of the groundwater within each dewatering well is calculated based on Darcy's law, which is the permeability coefficient of the aquifer in the area to be excavated.

[0116] Among them, the actual measured value of the groundwater level drop in the area to be excavated is measured in real time by the liquid level sensor in the observation well, and the minimum measured value of the groundwater level drop in the area to be excavated is used as the actual measured value of the groundwater level drop in the area to be excavated.

[0117] S300: Calculate a correction factor based on the precipitation data and the water level drop prediction value; the correction factor is:

[0118] α= S 实 ÷ ;

[0119] Where, S 实 It is the measured value of the groundwater level drop in the area to be excavated.

[0120] It is worth noting that the correction coefficient is constantly changing. For example, the system obtains the water output data of the precipitation well and the actual measured value of the groundwater level drop in the area to be excavated every hour, and then modifies the correction factor according to the predicted value of the groundwater level drop in the area to be excavated. The correction coefficient is continuously updated to ensure that the thickness of the aquifer in the area to be excavated is controlled near the target thickness value.

[0121] S400: A water level prediction model is obtained based on the correction factor; the water level prediction model is configured to calculate a water level drop correction value of groundwater in the area to be excavated based on the water output of the dewatering well; the water level drop correction value is:

[0122] S 修 =α×( ).

[0123] It is understandable that there is a certain difference between the predicted value of the groundwater level drop in the area to be excavated obtained by the above formula and the actual measured value of the groundwater level drop in the area to be excavated. The above formula obtains the predicted value of the groundwater level drop in the area to be excavated based on the proportional relationship between the water output of the dewatering well and the groundwater level elevation in the area to be excavated. However, due to the permeability of soil to water and the error value of water output measurement, the predicted value of the groundwater level drop in the area to be excavated obtained by the above calculation has a certain error.

[0124] The measured value of the groundwater level drop in the area to be excavated is obtained by the following steps:

[0125] Obtain the initial water level elevation of the observation well; obtain the real-time water level elevation of the observation well; calculate the water level drop of the observation well based on the initial water level elevation and the real-time water level elevation; the water level drop of the observation well is: S 观 =h 观初 -h 观实Where h 观初 is the initial water level elevation of the observation well; h 观实 =The real-time water level elevation of the observation well; based on the minimum water level drawdown of the observation well, determine the actual measured groundwater level drawdown in the area to be excavated. For safety reasons, the minimum water level drawdown of the observation well is generally used as the actual measured groundwater level drawdown in the area to be excavated.

[0126] In this embodiment, observation wells can be used to obtain relatively accurate groundwater level values within the area to be excavated. Using the theoretical and measured groundwater level drawdown values within the area to be excavated, a correction factor formula can be used to obtain a correction coefficient for the theoretical groundwater level drawdown within the area to be excavated. This paves the way for subsequently determining the target water yield of the dewatering wells.

[0127] S500: Input the target groundwater level drop in the area to be excavated into the water level prediction model to determine the target water output of the precipitation well when the total drainage volume of the precipitation well is minimum; the total drainage volume is: Q 总 = q 1+ q 2+ q 3+…… q j .

[0128] Among them, the correction value of the groundwater level drop in the area to be excavated is obtained through the theoretical value of the groundwater level drop in the area to be excavated and the measured value of the groundwater level drop in the area to be excavated. Through the formula corresponding to the correction value and the theoretical value of the groundwater level drop in the area to be excavated, more accurate groundwater level drop data in the area to be excavated can be obtained, thereby obtaining a linear relationship between the water output of the precipitation well and the groundwater level drop in the area to be excavated, and thus obtaining the water output of the precipitation well according to the target water level drop.

[0129] Specifically, when the user inputs the target water level drop into the water level prediction model, it is equivalent to determining the S 修 , the model requires the total discharge of the dewatering wells to satisfy the requirement that the groundwater level drop in the area to be excavated is greater than the target groundwater level drop in the area to be excavated. Understandably, the model generates multiple outputs for each dewatering well at this point, but the output for each dewatering well corresponding to the minimum total discharge is unique, i.e., the target output. During this process, the model updates the correction factor based on the predicted and measured water level drop at regular intervals (e.g., one hour), ensuring that the target output for each dewatering well remains optimal.

[0130] It is worth noting that due to the permeability coefficient of each precipitation well k Different, so the water output of each precipitation well is not the same.

[0131] Among them, the target water output corresponds to the minimum water output and operating power of the water pump, which can save the electricity consumption of the water pump when the groundwater level in the area to be excavated reaches the target underground water level in the area to be excavated. The less water output of the water pump, the less the transportation and storage costs of groundwater can be saved.

[0132] This application provides a groundwater level control method, the steps are as follows:

[0133] Step 1: Obtain precipitation data; precipitation data includes: the thickness of the aquifer in the area to be excavated, the water level elevation of the regional observation well, the water level elevation of the precipitation well, the water output of the precipitation well, the distance between the precipitation well and the observation well, etc.

[0134] Step 2: Calculate the predicted value of groundwater level drop in the area to be excavated based on precipitation data. The predicted value of groundwater level drop is calculated by using the interference drop theory formula based on the measured water output of the precipitation well, the distance between the observation point and the precipitation well, the permeability coefficient and other parameters.

[0135] Step 3: Calculate the correction factor based on the comparison between the measured precipitation data and the theoretical water level drop prediction value;

[0136] Step 4: Based on the correction factor, a revised water level prediction model is obtained; based on the revised water level prediction model and the measured water output of each dewatering well, the groundwater level drop correction value in the area to be excavated is calculated;

[0137] Step 5: Input the target groundwater level drawdown within the area to be excavated into the revised water level prediction model to determine the target water yield of each dewatering well when the total drainage volume is minimized. This allows for precise control of the groundwater level, avoiding increased energy consumption due to excessive groundwater extraction and safety hazards caused by rising water levels.

[0138] The present application provides a method for controlling groundwater levels. First, an observation well is set outside the area to be excavated, and second, a dewatering well is set outside the observation well. The number of the observation wells and dewatering wells is determined based on the size of the area to be excavated. After groundwater infiltrates the observation well area and stabilizes, the maximum groundwater level in the observation well is obtained through a liquid level sensor as the thickness of the aquifer in the area to be excavated. A water pump is started to pump out the groundwater in the dewatering well. After the maximum groundwater level in the observation well is greater than the depth to be excavated in the area to be excavated and stabilizes, it indicates that the aquifer thickness in the area to be excavated meets the excavation requirements, and excavation work can be carried out in the area to be excavated. The water level in the observation well determines the water output of the pump, i.e., the water output of the dewatering well, and the water output of the dewatering well determines the water level in the dewatering well, thereby determining the groundwater level in the area to be excavated. The linear relationship between the above data continuously updates the operating power of the water pump to achieve control of the aquifer thickness in the area to be excavated while also minimizing the operating power of the water pump in the dewatering well, thereby reducing the power consumption of the water pump.

[0139] This application provides a groundwater level control method. Liquid level sensors, flow rate sensors, and other sensors input real-time precipitation data into a precipitation system. Based on this precipitation data, the precipitation system calculates a predicted groundwater level drawdown within the area to be excavated. This predicted water level drawdown has a certain degree of error. This application obtains the measured groundwater level drawdown within the area to be excavated at preset intervals (e.g., every hour). A correction factor is derived from the measured and predicted water level drawdown values. The precipitation system then uses this correction factor to generate a water level prediction model. The water level drawdown values derived from the water level prediction model have a certain degree of accuracy compared to the predicted values, thereby improving the precise control of the water output of each pump. Users can input the target groundwater level drawdown within the area to be excavated into the water level prediction model. The water level prediction model then determines the target water output of each precipitation well, i.e., the target operating power of the pumps. The precipitation system then controls each pump to operate at the target power, thereby controlling the groundwater level drawdown within the area to be excavated within the target water level drawdown range.

[0140] It can be understood that the target water output of each precipitation well obtained by the water level prediction model, on the one hand, improves the accuracy of water level control, and the target water output data of each precipitation well can be corrected in real time through the water level prediction model; on the other hand, it reduces the operating power of the water pump. It can be understood that when the water pump operates at maximum power, it may also be able to meet the precipitation demand, but the water pump requires a large amount of electricity and has high energy consumption. The water level prediction model provided by this application can not only meet the precipitation demand, but also control the water pump to operate at the minimum power to meet the precipitation demand, that is, the total drainage of the precipitation well reaches the minimum value, thereby reducing the required electricity and energy consumption of the water pump.

[0141] like Figure 5 As shown, it is a schematic diagram of the hydraulic gradient of the observation well area in this application.

[0142] The method further comprises the following steps:

[0143] S600: Obtain the water level elevation of any two adjacent precipitation wells; S700: Obtain the water level elevation of the observation well; the observation well is set in the middle area outside the two adjacent precipitation wells; the horizontal distances between the observation well and the two adjacent precipitation wells are respectively the first distance L 11 and the second distance L 12 The observation well and the precipitation well have the same depth; wherein the water level elevation data of the precipitation well and the observation well are measured when the water pump is turned on and a water level difference is formed between the water level in the observation well and the water level in the precipitation well; S800: obtaining the hydraulic gradient in the observation well area based on the water level elevations of the observation well and the precipitation wells on both sides; the hydraulic gradient in the observation well area is used to calculate the target water level drawdown of the adjacent precipitation wells, and the hydraulic gradient is:

[0144] J=[(h 1降 -h 观 )÷L 11 +(h 2降 -h 观 )÷L 12 ]÷2.

[0145] Among them, h 1降 -h 观 =△h1;h 2降 -h 观 =△h2.

[0146] Where h 观 is the water level elevation of the observation well; h 1降 and h 2降 are the water level elevations of the two precipitation wells adjacent to the observation well; L 11 is the first distance; L 12 is the second distance.

[0147] The hydraulic gradient is the head loss per unit distance along the flow process when the fluid flows from a section with greater mechanical energy to a section with less mechanical energy, that is, the slope of the total head line. In this embodiment, it represents the hydraulic gradient in the area where the observation well is located.

[0148] S900: When it is determined that the water level drop of the observation well is the target water level drop of the groundwater in the area to be excavated, the target water level drops of the dewatering wells adjacent to the observation well on both sides are reduced; the target water level drops of the dewatering wells are:

[0149] S降 =S 观 +L 观降 ×J;

[0150] Where, L 观降 is the horizontal distance between the observation well and the adjacent precipitation wells on both sides; J is the hydraulic gradient of the observation well area.

[0151] S1000: Obtain the target water level elevation of the dewatering well according to the target water level drop and the initial water level elevation of the dewatering well; the target water level elevation of the dewatering well can satisfy that the groundwater level elevation in the area to be excavated is greater than the depth to be excavated in the area to be excavated, and can also achieve the minimum total operating power.

[0152] S1100: Based on the target water level of the dewatering well, the target operating power and water output of the water pump are adjusted to maintain the real-time water level of the dewatering well within the target water level control range. The target operating power and water output of the water pump ensure that the groundwater level in the area to be excavated is less than the depth to be excavated in the area to be excavated, while also minimizing the total operating power.

[0153] Specifically, when the target water output of the precipitation well is obtained, it is necessary to determine the target water level drop of each precipitation well, so as to control the operating power of the water pump and maintain the real-time water level elevation of the precipitation well within the target water level elevation control range. Maintaining the real-time water level elevation of the precipitation well within the target water level elevation control range means maintaining the real-time water level elevation of the precipitation well below the target water level. Among them, calculating the target water level drop of each precipitation well requires obtaining the hydraulic gradient in the observation well area. The water level drop of the two adjacent precipitation wells can be calculated through the hydraulic gradient. It can be understood that the purpose of this application is to make the groundwater level drop in the area to be excavated reach above the target water level drop. Therefore, under ideal conditions, the water level drop of each observation well should reach the target water level drop of the groundwater in the area to be excavated. Therefore, the target water level drop of the groundwater in the area to be excavated can be used to obtain the target water level elevation of each precipitation well, thereby obtaining the water level control index of each precipitation well. The operating power of the water pump can be adjusted through the water level control index so that the real-time water level elevation of each precipitation well is maintained within the target water level elevation control range, which not only meets the precipitation demand but also makes the operating power of the water pump reach the minimum value.

[0154] like Figure 2 The figure shows a schematic diagram of the water level index of the precipitation well in this application.

[0155] The step of adjusting the target operating power and water output of the water pump according to the target water level elevation of the precipitation well so as to maintain the real-time water level elevation of the precipitation well within the target water level elevation control range includes the following sub-steps:

[0156] S1200: Obtain water level control indicators of the dewatering well according to the target water level elevation of the dewatering well; the water level indicators include: target water level, safe water level, frequency increase water level, frequency decrease water level, and stop water level.

[0157] The safety water level is: h1=h j -0.5;

[0158] Where h j is the target water level, which is equal to the target water level elevation of the precipitation well;

[0159] The frequency-increasing water level is: h2=h1-1;

[0160] The frequency reduction water level is: h3=h2-2;

[0161] The safety water level is greater than the frequency-increasing water level, the frequency-increasing water level is greater than the frequency-reducing water level, and the frequency-reducing water level is greater than the stop water level. The water level index is used to control the operating power of the water pump.

[0162] S1300: Adjusting the target operating power and water output of the water pump based on the water level control index and the real-time water level of the dewatering well to maintain the real-time water level of the dewatering well within the target water level control range. The water pump, based on the target operating power and water output, can ensure that the groundwater level in the area to be excavated is less than the depth to be excavated in the area to be excavated, while also minimizing total operating power.

[0163] The step of adjusting the target operating power and water output of the water pump according to the water level control index and the real-time water level elevation of the precipitation well so as to maintain the real-time water level elevation of the precipitation well within the target water level elevation control range includes the following sub-steps:

[0164] S1310: If the real-time water level elevation of the dewatering well is greater than or equal to the safety water level, the water pump is controlled to run at full frequency; when the real-time water level elevation of the dewatering well is greater than or equal to the safety water level, it means that the groundwater level elevation in the area to be excavated is about to be lower than the excavation depth of the area to be excavated, which may easily cause safety hazards, so it is necessary to control the water pump to run at full frequency to quickly pump out the water in the dewatering well so that the water level in the dewatering well drops below the safety water level.

[0165] S1320: If the real-time water level elevation of the dewatering well is less than the safe water level and greater than or equal to the frequency-increasing water level, the power of the water pump is controlled to increase gradually according to the set power until the real-time water level elevation of the dewatering well is less than the frequency-increasing water level; when the real-time water level elevation of the dewatering well is less than the safe water level and greater than or equal to the frequency-increasing water level, it means that the groundwater level elevation in the area to be excavated is about to be at the safe water level and has an upward trend, so it is necessary to control the operating power of the water pump to gradually increase with the set power to lower the water level in the dewatering well to the frequency-increasing water level to prevent the occurrence of safety hazards.

[0166] S1330: If the real-time water level elevation of the dewatering well is less than the frequency-increasing water level and greater than or equal to the frequency-decreasing water level, the water pump is controlled to operate at a preset power; when the real-time water level elevation of the dewatering well is less than the frequency-increasing water level and greater than or equal to the frequency-decreasing water level, it means that the real-time water level elevation of the dewatering well meets the requirements, and it can be ensured that the groundwater level elevation in the area to be excavated is greater than the depth to be excavated in the area to be excavated, so the water pump is controlled to operate at a constant preset power, that is, it can be ensured that the groundwater level elevation in the area to be excavated tends to be stable, and it can also be ensured that the power consumption of the water pump is within the minimum range, saving the power consumption of the water pump.

[0167] S1340: If the real-time water level elevation of the dewatering well is less than the frequency-reduction water level and greater than or equal to the stop water level, the power of the water pump is controlled to be gradually reduced according to the set power until the real-time water level elevation of the dewatering well is greater than the frequency-reduction water level; when the real-time water level elevation of the dewatering well is less than the frequency-reduction water level and greater than or equal to the stop water level, it means that the real-time water level elevation of the dewatering well has fully met the target water level elevation of the groundwater in the area to be excavated, so there is no need to operate at too high an operating power, and the power of the water pump can be controlled to be gradually reduced according to the set power, thereby saving the electricity consumption of the water pump.

[0168] S1350: If the real-time water level of the dewatering well is lower than the stop water level, the water pump is stopped until the real-time water level of the dewatering well reaches the ramp-up water level. The water pump is then started and its power is gradually increased according to the set power. If the real-time water level of the dewatering well is lower than the stop water level, indicating that the groundwater level in the area to be excavated is significantly greater than the desired depth, the water pump is stopped until the real-time water level of the dewatering well reaches the ramp-up water level, at which point the water pump is started. After starting the water pump, the water pump power is gradually increased according to the set power to prevent a sudden rise in the water level from causing the pump power to fail to meet the required pumping capacity.

[0169] This application provides a groundwater level control method, the specific application scenarios are as follows:

[0170] Known conditions:

[0171] Assume that a foundation pit is 35m long, 55m wide, with an excavation depth of h=15.0m and a ground temperature of ±0.00m; the initial water level in the survey report and preliminary investigation is -5.0m, the aquifer thickness is H=20.0m, the permeability coefficient is K=50m / d, and the minimum drawdown is S=h+1=16.0m.

[0172] Design calculation:

[0173] Groundwater influence radius R=2S =2×16.0× =1012m;

[0174] The area to be excavated is A = 35 × 55 m = 1925 m 2 ;

[0175] Equivalent radius of the area to be excavated r0= =612.7m;

[0176] According to the diving complete well formula: ;

[0177] Among them, such as Figure 6 As shown, a total of 11 wells are arranged, with the water yield of a single well q=1.1Q / n=1.1×14545 / 11=1202m³ / d and a pumping capacity of 60m³ / h; the designed water pump operating power is 80m³ / h and the head is 35m; the water output of the pump is adjusted by the intelligent system.

[0178] Among them, 11 precipitation wells J1~J11 are arranged, with a well spacing of 20m and a well depth of 30m; the distances between the observation well G1 and each precipitation well are r1~r11 respectively.

[0179] The following table shows the water output of each pump.

[0180]

[0181] When the water output of the water pump is adjusted to the same as the theoretical calculated value of 60m³, the theoretically predicted interference reduction depth is:

[0182] S i = ;

[0183] The interference reduction depth is S1=18.65m at point G1;

[0184] If the measured drawdown is S 1实 =17.5m;

[0185] Then the correction coefficient is α1=S 1实 ÷ =17.5 / 18.65=0.9384;

[0186] Similarly, calculate G2 point S2=17.83m; G3 point S1=18.65m; G4 point S1=17.83m;

[0187] Measured data: S 2实 =16.9m;S 3实 =17.6m;S 4实 =17.0m;

[0188] Similarly, the correction coefficients are calculated as α2=0.9478; α3=0.9437; α4=0.9534;

[0189] The weighted average is: α = (α1 + α2 + α3 + α4) / 4 = 0.9458;

[0190] The adjusted forecast formula is:

[0191] S 修 =α×( )=0.9458×( );

[0192] Adjust the water pump output to 50m³ / h and the water level will be restored.

[0193] The following table shows the water output of each pump.

[0194]

[0195] According to the revised formula, prediction:

[0196] S 1修 =0.9458×( ) = 17.85m;

[0197] The value measured by the monitoring system is S1=17.80m;

[0198] Error = 17.75-17.85 = -0.1m. When the error is less than ±0.3m, there is no need to repeat the correction.

[0199] Accuracy = 17.8 / 17.85×100% = 99.44%.

[0200] A second aspect of the present application provides a method for applying to an area to be excavated, wherein a plurality of dewatering wells are provided on the periphery of the area to be excavated, and a water pump is provided in the dewatering wells, and the water pump is used to pump water out of the dewatering wells; the method comprises:

[0201] A data acquisition module, wherein the data acquisition module is configured to:

[0202] Acquire precipitation data; the precipitation data includes: the groundwater level elevation in the area to be excavated and the water output of the precipitation well;

[0203] A data processing module, wherein the data processing module is configured to:

[0204] According to the precipitation data, the predicted value of groundwater level drop in the area to be excavated is calculated; the predicted value of groundwater level drop is:

[0205] S i = ;

[0206] Where, S i Lowering the groundwater level in the area to be excavated; H is the thickness of the aquifer in the area to be excavated; For the j The water output of the precipitation well; k is the permeability coefficient of the aquifer in the area to be excavated; R is the influence radius; For the j The distance from the center of the drainage well to the center of the area to be excavated; n is the number of precipitation wells;

[0207] According to the precipitation data and the water level drop prediction value, a correction factor is calculated; the correction factor is:

[0208] α= S 实 ÷ ;

[0209] Where, S 实 The measured value of the groundwater level drop in the area to be excavated;

[0210] According to the correction factor, a water level prediction model is obtained; the water level prediction model is configured to calculate a water level drop correction value of groundwater in the area to be excavated according to the water output of the dewatering well; the water level drop correction value is:

[0211] S 修 =α×( );

[0212] A data output module, wherein the data output module is configured to:

[0213] The target groundwater level drop in the area to be excavated is input into the water level prediction model to determine the target water output of each precipitation well when the total drainage volume of the precipitation well is minimized; the total drainage volume is: Q总 = q 1+ q 2+ q 3+…… q j ;

[0214] An early warning module is configured to:

[0215] When the real-time water level elevation of the precipitation well is greater than the warning water level, an alarm is sounded and a warning message is sent to a setting device; the warning water level is greater than the safety water level; the warning message includes: the well number and water level status of the precipitation well whose real-time water level elevation is greater than the warning water level; the water level status includes: the real-time water level elevation and the safety water level of the precipitation well.

[0216] In this embodiment, in order to prevent the real-time water level elevation of the precipitation well from being greater than the warning water level due to damage to the water pump installed in the precipitation well, an early warning device is installed in the precipitation well to obtain the water level elevation of the precipitation well in real time. When the water level elevation of the precipitation well is greater than the warning water level, an alarm is issued and the early warning information is sent to the setting device. The setting device can be an observation platform for the precipitation well or a mobile device, such as a mobile phone or other electronic device. Construction personnel can obtain the model of the precipitation well whose water level elevation exceeds the warning water level based on the early warning information, thereby obtaining its location and taking action against it immediately to prevent the groundwater level elevation in the area to be excavated from being less than the depth to be excavated in the area to be excavated, and the groundwater from infiltrating into the area to be excavated, causing safety hazards.

[0217] In this embodiment, the early warning module is configured with an early warning light; the early warning module is further configured to:

[0218] When the real-time water level of the precipitation well is greater than or equal to the safe water level, the warning light is controlled to display red;

[0219] When the real-time water level of the precipitation well is lower than the safe water level and greater than or equal to a preset value, the warning light is controlled to display yellow; the preset value is: X=h1-0.5;

[0220] In the formula, h1 is the safe water level;

[0221] When the real-time water level elevation of the precipitation well is less than the preset value, the warning light is controlled to display green.

[0222] The warning lights can be arranged at the observation panel of the precipitation well, and the user can quickly and accurately obtain the water level status of the precipitation well through the color of the warning lights corresponding to each precipitation well.

[0223] It is worth noting that the effects of the above system embodiment during operation can be found in the effects of the above method embodiment, which will not be described in detail here.

[0224] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not intended to limit the scope of protection of the embodiments of the present application. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the scope of protection of the embodiments of the present application.

Claims

1. A groundwater level control method is applied to an area to be excavated, wherein a plurality of precipitation wells and observation wells are arranged outside the area to be excavated, the observation wells are arranged outside the precipitation wells, and a water pump is arranged in the precipitation wells, and the water pump is used to pump water out of the precipitation wells; characterized in that: include: Acquire precipitation data; the precipitation data includes: the groundwater level elevation in the observation well, the water output of the precipitation well, and the maximum groundwater level elevation in the observation well is the thickness of the aquifer in the area to be excavated; According to the precipitation data, the predicted value of groundwater level drop in the area to be excavated is calculated; the predicted value of groundwater level drop is: ； Where, S i is the groundwater level drawdown in the area to be excavated (m); H is the thickness of the aquifer in the area to be excavated (m); For the j The water output of the precipitation well (m³ / d); k is the permeability coefficient of the aquifer in the area to be excavated (m / d); R is the influence radius; For the j The distance from the center of the drainage well to the center of the area to be excavated (m); n is the number of precipitation wells; According to the minimum water level drop of observation wells G1, G2, G3, and G4, the measured value of the groundwater level drop in the area to be excavated is determined. S 1实 、 S 2实 、 S 3实 、 S 4实 ; According to the precipitation data and the water level drop prediction value, the correction factor α1 is calculated; the correction factor α1 is: α1= S 1实 ÷ ； Where, S 1实 The measured value of the groundwater level drop in the area to be excavated; The measured value of water level drawdown S 2实 、 S 3实 、 S 4实 as well as Calculate correction factors α2, α3, and α4; updating a correction factor based on the measured value and the predicted value of the water level drawdown, wherein the correction factor is updated so that the water output and the operating power of the water pump corresponding to the target water output are both minimum values; According to the correction factor, a water level prediction model is obtained; the water level prediction model is configured to calculate a water level drop correction value of groundwater in the area to be excavated according to the water output of the dewatering well; the water level drop correction value is: ； Wherein, α is obtained by weighting the correction factors α1, α2, α3, and α4; The target groundwater level drop in the area to be excavated is input into the water level prediction model to determine the target water output of each precipitation well when the total drainage volume of the precipitation well is minimized. The total drainage volume is: Q 总 = q 1+ q 2+ q 3+…… q j ; The water level prediction model is further configured to: Get the water level elevation of any two adjacent precipitation wells; Obtaining the water level elevation of an observation well; the observation well is located in the middle area outside the two adjacent precipitation wells; the horizontal distances between the observation well and the two adjacent precipitation wells are respectively a first distance and a second distance; the observation well and the precipitation well have the same depth; According to the water level elevation of the observation well and the dewatering wells on both sides, the hydraulic gradient in the observation well area is obtained; the hydraulic gradient is: J=[(h 1降 -h 观 )÷L 11 +(h 2降 -h 观 )÷L 12 ]÷2; Where h 观 is the water level elevation of the observation well; h 1降 and h 2降 are the water level elevations of the two precipitation wells adjacent to the observation well; L 11 is the first distance; L 12 is the second distance; When it is determined that the water level drop of the observation well is the target water level drop of the groundwater in the area to be excavated, the target water level drops of the precipitation wells adjacent to the observation well on both sides are; the target water level drops of the precipitation wells are: S 降 =S 观 +L 观降 ×J; Where, L 观降 is the horizontal distance between the observation well and the adjacent precipitation wells on both sides; J is the hydraulic gradient of the observation well area; Obtaining the target water level elevation of the precipitation well according to the target water level drop and the initial water level elevation of the precipitation well; According to the target water level elevation of the dewatering well, the target operating power and water output of the water pump are adjusted so that the real-time water level elevation of the dewatering well is maintained within the target water level elevation control range.

2. A groundwater level control method according to claim 1, characterized in that: The measured value of the groundwater level drop in the area to be excavated is obtained by the following steps: Obtaining the real-time water level elevation of the observation well; The water level drop of the observation well is calculated based on the initial water level elevation and the real-time water level elevation of the observation well; the water level drop of the observation well is: S 观 =h 观初 -h 观实 ; Where h 观初 is the initial water level elevation of the observation well; h 观实 The real-time water level elevation of the observation well; According to the minimum water level drop of the observation well, the actual measured value of the groundwater level drop in the area to be excavated is determined.

3. A groundwater level control method according to claim 1, characterized in that: The step of adjusting the target operating power and water output of the water pump according to the target water level elevation of the precipitation well so as to maintain the real-time water level elevation of the precipitation well within the target water level elevation control range includes: Obtaining a water level control index of the precipitation well according to the target water level elevation of the precipitation well; According to the water level control index and the real-time water level elevation of the precipitation well, the target operating power and water output of the water pump are adjusted so that the real-time water level elevation of the precipitation well is maintained within the target water level elevation control range.

4. A groundwater level control method according to claim 3, characterized in that: The water level control indicators include: Target water level, safe water level, frequency increase water level, frequency decrease water level, stop water level; The safety water level is: h1=h j -0.5; Where h j is the target water level, which is equal to the target water level elevation of the precipitation well; The frequency-increasing water level is: h2=h1-1; The frequency reduction water level is: h3=h2-2; The stop water level is: h4=h3-3; The safety water level is greater than the frequency-increasing water level, the frequency-increasing water level is greater than the frequency-decreasing water level, and the frequency-decreasing water level is greater than the stop water level.

5. A groundwater level control method according to claim 4, characterized in that: The step of adjusting the target operating power and water output of the water pump according to the water level control index and the real-time water level elevation of the precipitation well so as to maintain the real-time water level elevation of the precipitation well within the target water level elevation control range includes: If the real-time water level of the dewatering well is greater than or equal to the safety water level, the water pump is controlled to operate at full frequency; If the real-time water level elevation of the dewatering well is less than the safety water level and greater than or equal to the frequency-increasing water level, the power of the water pump is controlled to increase gradually according to the set power until the real-time water level elevation of the dewatering well is less than the frequency-increasing water level; If the real-time water level of the dewatering well is less than the frequency-increasing water level and greater than or equal to the frequency-decreasing water level, the water pump is controlled to operate at a preset power; If the real-time water level elevation of the dewatering well is less than the frequency reduction water level and greater than or equal to the stop water level, the power of the water pump is controlled to be gradually reduced according to the set power until the real-time water level elevation of the dewatering well is greater than the frequency reduction water level; If the real-time water level elevation of the dewatering well is lower than the stop water level, the water pump is controlled to stop running until the real-time water level elevation of the dewatering well rises to the frequency-increasing water level, the water pump is started and the power of the water pump is controlled to increase gradually according to the set power.

6. A groundwater level control method according to claim 1, characterized in that: Before the step of obtaining precipitation data, the method includes: Dividing the area to be excavated into a plurality of partitions; the partitions are divided according to the depth to be excavated and the construction sequence; the length of each partition is less than a preset length; The precipitation wells are arranged at the periphery of the partition; and the distance between the precipitation wells is less than a preset distance.

7. A groundwater level control system is applied to an area to be excavated, wherein a plurality of precipitation wells and observation wells are arranged outside the area to be excavated, wherein the observation wells are arranged outside the precipitation wells, and a water pump is arranged in the precipitation wells, wherein the water pump is used to pump water out of the precipitation wells; characterized in that: include: A data acquisition module, wherein the data acquisition module is configured to: Acquire precipitation data; the precipitation data includes: the groundwater level elevation in the observation well, the water output of the precipitation well, and the maximum groundwater level elevation in the observation well is the thickness of the aquifer in the area to be excavated; A data processing module, wherein the data processing module is configured to: According to the precipitation data, the predicted value of groundwater level drop in the area to be excavated is calculated; the predicted value of groundwater level drop is: ； Where, S i is the groundwater level drawdown in the area to be excavated (m); H is the thickness of the aquifer in the area to be excavated (m); For the j The water output of the precipitation well (m³ / d); k is the permeability coefficient of the aquifer in the area to be excavated (m / d); R is the influence radius; For the j The distance from the center of the drainage well to the center of the area to be excavated (m); n is the number of precipitation wells; According to the minimum water level drop of observation wells G1, G2, G3, and G4, the measured value of the groundwater level drop in the area to be excavated is determined. S 1实 、 S 2实 、 S 3实 、 S 4实 ; According to the precipitation data and the water level drop prediction value, calculate the correction factor α1; the correction factor α1 is: α1= S 1实 ÷ ； Where, S 1实 The measured value of the groundwater level drop in the area to be excavated; The measured value of water level drop S 2实 、 S 3实 、 S 4实 as well as Calculate correction factors α2, α3, and α4; updating a correction factor based on the measured value and the predicted value of the water level drawdown, wherein the correction factor is updated so that the water output and the operating power of the water pump corresponding to the target water output are both minimum values; According to the correction factor, a water level prediction model is obtained; the water level prediction model is configured to calculate a water level drop correction value of groundwater in the area to be excavated according to the water output of the dewatering well; the water level drop correction value is: ； Wherein, α is obtained by weighting the correction factors α1, α2, α3, and α4; A data output module, wherein the data output module is configured to: The target groundwater level drop in the area to be excavated is input into the water level prediction model to determine the target water output of each precipitation well when the total drainage volume of the precipitation well is minimized. The total drainage volume is: Q 总 = q 1+ q 2+ q 3+…… q j ; The water level prediction model is further configured to: Get the water level elevation of any two adjacent precipitation wells; Obtaining the water level elevation of an observation well; the observation well is located in the middle area outside the two adjacent precipitation wells; the horizontal distances between the observation well and the two adjacent precipitation wells are respectively a first distance and a second distance; the observation well and the precipitation well have the same depth; According to the water level elevation of the observation well and the dewatering wells on both sides, the hydraulic gradient in the observation well area is obtained; the hydraulic gradient is: J=[(h 1降 -h 观 )÷L 11 +(h 2降 -h 观 )÷L 12 ]÷2; Where h 观 is the water level elevation of the observation well; h 1降 and h 2降 are the water level elevations of the two precipitation wells adjacent to the observation well; L 11 is the first distance; L 12 is the second distance; When it is determined that the water level drop of the observation well is the target water level drop of the groundwater in the area to be excavated, the target water level drops of the precipitation wells adjacent to the observation well on both sides are; the target water level drops of the precipitation wells are: S 降 =S 观 +L 观降 ×J; Where, L 观降 is the horizontal distance between the observation well and the adjacent precipitation wells on both sides; J is the hydraulic gradient of the observation well area; Obtaining the target water level elevation of the precipitation well according to the target water level drop and the initial water level elevation of the precipitation well; According to the target water level elevation of the precipitation well, the target operating power and water output of the water pump are adjusted so that the real-time water level elevation of the precipitation well is maintained within the target water level elevation control range; An early warning module is configured to: When the real-time water level elevation of the precipitation well is greater than the warning water level, an alarm is sounded and a warning message is sent to a setting device; the warning water level is greater than the safety water level; the warning message includes: the well number and water level status of the precipitation well whose real-time water level elevation is greater than the warning water level; the water level status includes: the real-time water level elevation and the safety water level of the precipitation well.

8. A groundwater level control system according to claim 7, characterized in that: The early warning module is configured with an early warning light; the early warning module is further configured to: When the real-time water level of the precipitation well is greater than or equal to the safe water level, the warning light is controlled to display red; When the real-time water level of the precipitation well is lower than the safe water level and greater than or equal to a preset value, the warning light is controlled to display yellow; the preset value is: X=h1-0.5; In the formula, h1 is the safe water level; When the real-time water level elevation of the precipitation well is less than the preset value, the warning light is controlled to display green.

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